APERA PH850 Portable pH Meter Kit User Manual
- June 3, 2024
- APERA
Table of Contents
PH850 Portable pH Meter Kit
PH850 Portable pH Meter
Manual
PH850 Portable pH Meter EC850 Portable Cond. Meter PC850 Portable pH/Cond.
Meter
APERA INSTRUMENTS (Europe) GmbH
www.aperainst.de
PC850 Version1.0
Table of Contents 1. Introduction ————————————————————————————————————————— 1
2. Specifications ————————————————————————————————————————-2 3. Instrument
Description ————————————————————————————————————-3
3.1. LCD display———————————————————————————————— ———————-3 3.2. Keypad
functions —————————————————————————————————————3 3.3. Meter socket
———————————————————————————————————————5 3.4. Reading stability display mode
——————————————————————————————–5-3.5. Automatic lock-up display mode
—————————————————————————————— 5 3.6. Automatic power off
——————————————————————————————————— 5 3.7. Temperature adjustment
—————————————————————————————————- 5 4. pH measurement
——————————————————————————————————————–64.1. pH electrode
information——————————————————————————————————64.2. pH calibration
consideration ————————————————————————————————-6 4.3. pH calibration
——————————————————————————————————————–7 4.4. Sample test
———————————————————————————————————————-8 4.5. pH electrode
maintenance—————————————————————————————————-9 5. mV value
measurement————————————————————————————————————1–1 6. Conductivity measurement
——————————————————————————————————-1–26.1. Conductivity electrode
information—————————————————————————————–1-26.2. Conductivity calibration
——————————————————————————————————12 6.3. Conductivity
calibration——————————————————————————————————-1- 3 6.4. Relationship between
TDS and Conductivity —————————————————————————1-4-6.5. Sample
test———————————————————————————————————————-1–4 6.6. Conductivity electrode
maintenance————————————————————————————–1–57. Parameter
setting——————————————————————————————————————–1-57.1. Main
menu———————————————————————————————————————–1–5 7.2. Submenu
————————————————————————————————————————1–6 7.3. Submenu of pH parameter
setting —————————————————————————————-1-7-7.4. Submenu of Conductivity
parameter setting —————————————————————————1–77.5. Submenu of standard basic
parameter setting ———————————————————————– 18 8. Meter
Kits——————————————————————————————————————————1-9 9.
Warranty——————————————————————————————————————————–1-9 Appendix I: Parameter
setting & Factory default setting———————————————————————-2–0 Appendix II:
Abbreviation Glossary————————————————————————————————-21 Appendix III: Self-
diagnosis information—————————————————————————————— 2212
PC850 Version1.0
1. Introduction
Thanks for purchasing PH850 portable pH meter. This meter is a perfect
combination of the most advanced electronics technology, sensor technology,
and software design, and is the most cost-effective portable electrochemical
meter designed for industrial and mining enterprises, power plants, water
treatment engineering, environmental protection industry, etc., especially
ideal for general field use.
In order to use and maintain the instrument properly, please read the manual
thoroughly before use. (To improve instrument performance constantly, we
reserve the right to change the manual and accessories without giving notice
in advance.)
1.1. Measurement Parameters
Measurement parameters
PH850
pH/mV
Conductivity
Temperature
EC850
PC850
1.2. Basic Features
The microprocessor-based portable meter features automatic
calibration, automatic temperature compensation, function setup,
self-diagnostics, automatic power-off and low voltage display.
PC850 meter is able to measure up to 3 parameters simultaneously
and switch displays effortlessly. Please see Diagram -1:
two electrodes at most can be fit into the clip to measure 3 parameters
simultaneously.
Diagram-1
The meter’s digital filter improves measurement speed and accuracy. There is a stable reading
indication on the display.
The package includes a portable case, a meter, electrodes, standard solutions and all accessories, which is convenient to use in field.
The meter is dust proof and waterproof, meeting the IP57 rating.
1.3. pH Measurement Features (for Model PH850 and PC850) 1-3 points automatic
calibration, the meter provides calibration guide and automatic checking
function. The meter is able to recognize pH standard buffer solutions
automatically. USA series and NIST series buffer solutions can be selected.
The meter provides three types of reading stability criteria.
1
1.4. Conductivity Measurement Features (for Model EC850 and PC850) 1-4 points automatic calibration, the meter provides calibration guide and automatic checking function. The meter is able to switch between conductivity and TDS. The meter is able to recognize conductivity standard solutions automatically.
2. Specifications
2.1. Main specifications
Range
Resolution pH
Accuracy
Temperature compensation
Range
mV
Resolution
Accuracy
Range
Conductivity
Resolution
Accuracy
Temperature compensation
Electrode constant
Range
Temperature
Resolution
Accuracy
Specifications (0.00~14.00) pH 0.1/0.01 pH ±0.01 pH ±1 digit
(0~100)°C (manual or automatic)
±1,000 mV 1 mV
±0.2% F.S ±1 digit Conductivity: 0~200 mS/cm (divided into five ranges):
(0.00~19.99) S/cm; (20.0~199.9) S/cm; (200~1999) S/cm; (2.00~19.99) mS/cm;
(20.0~199.9) mS/cm TDS: (0~100) g/l
0.01/0.1/1S/cm 0.01/0.1 mS/cm ±1.0% F.S ±1digit
(0 ~50)°C (manual or automatic)
0.1 / 1 / 10 cm-1 0~100°C
0.1°C
±0.5°C ±1 digit
Models
PH850 PC850
EC850 PC850
PH850 EC850 PC850
2.2. Other specifications: Power
AAA batteries × 3 (1.5V×3)
IP rating
IP57
Meter: (86×196×33) mm / 335 g
Dimension & Weight
Portable case:(330×270×82)mm/1.3kg
PH850, EC850
Portable case:(370×270×77)mm/1.8kg
PC850
2
3. Instrument Description
3.1. LCD Display
HOLD
Diagram-2
(1) — Parameter mode icons
LCD
(2) — Measurement reading
(3) — Prompts of special display mode
(4) — Units of measurement
(5) — Temperature units (°C and °F)
(6) — Units of pH and conductivity calibration value
(7) — pH and conductivity calibration value, and prompts of special display mode
(8) — Temperature value, and prompts of special display mode
(9) — Temperature compensation icons
ATC — automatic temperature compensation, MTC — manual temperature compensation
(10) — Calibration guide icon
(11) — Stability icon of readings
(12) — Low battery icon, when this icon appears, please replace the battery
(13) — Automatic reading hold icon
3.2. Keypad functions
3
Diagram-3 Keypad
3.2.1. Keypad operations
Short press —– <1.5 seconds; Long press —– >1.5 seconds.
Turn on the meter: Press to turn on the meter.
Turn off the meter: In the measurement mode, press
and hold for 2 seconds to turn off the
meter.
Note: In the calibration mode or the parameter setup mode, pressing is invalid. Please
press
key to return to the measurement mode, then press
to turn off the meter.
Chart -1 Keypad operations and descriptions
Keypad Operations
Descriptions
Short press Long press
In the power-off mode, press this key to turn on the meter
In the measurement mode, press and hold this key for 2 seconds to turn off the
meter.
Short/long press
Short press
Select measurement parameters:
pH 850 pH meter:
EC 850 Conductivity meter:
PC 850 pH/Conductivity meter:
In the measurement mode: long press to enter manual
temperature compensation mode, then long press or momentary
press this key to change the temperature value (only one
direction).
In the parameter setup mode, press this key to change the serial
number of the main menu and the submenu (only one direction)
In the submenu mode, press this key to change parameters and
setup (only one direction)
In the measurement mode, press this key to enter in the calibration mode
In the calibration mode or the parameter setup and auto lock-up (HOLD) mode,
press this key to return to the measurement mode
Short press
In the measurement mode, press this key to enter in the parameter setup main
menu
In the calibration mode, press this key to make calibration In the parameter
setup mode, press this key to select programs
4
3.3. Meter socket Models
pH 850 pH meter
EC 850 Conductivity
meter
PC 850 pH/Conductivity
meter
Chart-2 Sockets for Meters
Photos
Description
· BNC socket (right) — connect
· pH electrode or ORP electrode,
· RCA socket (middle) — connect temperature
probe
· Eight-pin socket (left) — connect conductivity electrode
· BNC socket (right) — connect pH electrode or ORP electrode,
· RCA socket (middle) — connect temperature probe
· Eight-pin socket (left) — connect conductivity electrode
3.4. Reading Stability Display Mode When the measuring value is stable, smiley icon
appears on LCD, see
Diagram 4. If the smiley icon
does not appear or flash, please do not
get the reading value or make calibration until the measuring value is stable.
Per parameter P1.3, there are 3 criteria for stability standard:
(Normal), (High), and
(Low). The factory default is set
“Normal”. “High” is set for stability for longer time, “Low” is set for stability for
shorter time. User can select suitable stability criteria according to different
testing requirement.
Diagram- 4
3.5. Automatic Lock-Up Display Mode Select On from parameter P4.6 to turn on automatic lock-up display function. When the reading value stabilizes more than 10 seconds, the meter locks the measuring value automatically and displays HOLD icon, see Diagram
5. In the HOLD mode, press
to release lock-up.
3.6. Automatic Power-off
Diagram – 5
The meter will be power-off if there is no operation for 20 minutes. The time of auto power-off can be
set in parameter setting P3.2
3.7. Temperature Adjustment When the temperature probe does not connect to the meter, long press
key, temperature value
flashes, then long press
key or short press
key to change the temperature value in one
way, and press
key to make confirmation.
5
4. pH Measurement
4.1. pH Electrode Information The meter matches 201T-F plastic three-in-one
combination pH electrode with built-in temperature sensor to realize automatic
temperature compensation. Electrode housing adopts polycarbonate engineering
plastics which is corrosion and impact resistant. The BNC socket of electrode
connects pH socket; RCA socket connects temperature socket. When dip the
electrode in the solution, please stir the solution briefly and allow it to
stay in the solution until a stable reading is reached.
4.2. pH Calibration Consideration 4.2.1. Standard buffer solution The meter uses two series of standard buffer solution: USA series and NIST series, 3 solutions for each series which are corresponding to calibration indication icons. Please see Chart – 3 for the two series of standard buffer solution.
Chart – 3 pH standard buffer solution series
Icons
pH standard buffer solution series
USA series
NIST series
Three-point calibration
4.00 pH 7.00 pH 10.01 pH
4.01 pH 6.86 pH 9.18 pH
4.2.2. Three-point calibration The instrument can perform 1-3 points
calibration. The first point calibration must use 7.00 pH (or 6.86 pH)
standard solution, then select other standard solution to perform the second
and the third point calibration. See chart 4.
Chart – 4 Three-point calibration mode
One-point calibration
USA standard 7.00 pH
NIST standard 6.86 pH
Icons
Suited range
Accuracy
±0.1pH
Two-point calibration
7.00 pH 4.00 pH 6.86 pH 4.01 pH 7.00 pH 10.01 pH 6.86 pH 9.18 pH
Range< 7.00pH Range> 7.00pH
Three-point 7.004.0010.01 pH 6.864.01 9.18 pH
calibration
Large Range
4.2.3. Calibration intervals
Calibration intervals depend on the sample, the electrode performance, and the
required accuracy. For high accuracy measurements ( ±0.03pH), the meter should
be calibrated immediately before
6
taking a measurement. For general accuracy (±0.1pH), the meter can be calibrated and used for approximately one week before the next calibration. The meter must be recalibrated in the following situations: (a) New probe or probe that has not been used for a long time (b) After measuring acid (pH<2) or alkaline solutions (pH>12) (c) After measuring a solution that contains fluoride or a concentrated organic solution (d) If the solution’s temperature differs greatly from the calibration solution temperature
4.3. pH Meter Calibration (with an example of three-point calibration) 4.3.1. First point calibration
(a) Press
key to enter into the calibration mode, ” CAL 1 ” blinks at the
top right of LCD and “7.00 pH” blinks at the bottom right of LCD, indicating using pH 7.00 buffer solution to make the 1st point calibration. (b) Rinse pH electrode in pure water, allow it to dry, and submerge it in pH7.00 buffer solution. Stir the solution briefly and allow it to stay in the
buffer solution until a stable reading is reached. When stable
icon
displays on LCD, press
key to calibrate, then 1st point calibration is
finished, the meter enters in measurement mode of one-point calibration.
Calibration guide icon
displays at the bottom left of LCD.
See Diagram-6.
4.3.2. Second point calibration
Press
key to enter into the calibration mode, ” CAL 2 ” blinks at the top
right of LCD indicating to make the 2nd point calibration. Rinse pH electrode
in pure water, allow it to dry, and submerge it in pH4.00 buffer solution. Stir
the solution briefly and allow it to stay in the buffer solution until a stable
reading is reached. The meter’s display will show scanning and locking
process of calibration buffer solution at the bottom right of LCD. When the
Diagram- 6
meter locks 4.00 pH, stable
icon displays on LCD, press
key to calibrate the meter. LCD
will display electrode slope of acidity range, then 2nd point calibration is finished, the meter enters in
measurement mode of two-point calibration. Calibration guide icons
display at the bottom
left of LCD.
4.3.3. Third point calibration
Press
key to enter into the calibration mode, ” CAL 3 ” blinks at the top right of LCD indicating
to make the 3rd point calibration. Rinse pH electrode in pure water, allow it to dry, and submerge it in
7
pH10.01 buffer solution. Stir the solution briefly and allow it to stay in the buffer solution until a stable
reading is reached. The meter’s display will show scanning and locking process of calibration buffer
solution at the bottom right of LCD. When the meter locks 10.01pH, stable
icon displays on
LCD, press
key to calibrate the meter. LCD will display electrode slope of alkalinity range, then
3rd point calibration is finished, the meter enters in measurement mode of three-point calibration.
Calibration guide icons
display at the bottom left of LCD.
Notes: (a) The meter can perform 1-3 points calibration. When the 1st point calibration is done, the meter will enter in measurement mode of one-point calibration. Two-point and three-point calibration are in the same manner.
(b) During the calibration process, if measuring value is not stable yet (when
does not appear
and the
key is pressed, then Er 2 displays. See chart 5.
(c) To exit from the calibration mode, press
key.
4.4. Sample Test 4.4.1. Rinse pH electrode in pure water, allow it to dry, and submerge it in tested solution. Stir the
solution briefly and allow it to stay in the tested solution until
icon appears on LCD and a stable
reading is reached, which is the pH value of tested solution. Diagram 7 is the calibration and measurement process of pH meter
Press to turn on the meter
Press
key to
enter into the
calibration mode.
Press
key to
enter into the
calibration mode.
Submerge the electrode in pH7.00 solution, press
key when icon appears.
Submerge the electrode in pH4.00 solution, press
key when icon appears.
One-point calibration is done, the meter enter in measurement mode
1st point calibration
Two point calibration is done, the meter enter in measurement mode
2nd point calibration
Sample Test
Press
key to
enter into the
calibration mode.
Submerge the electrode in pH10.01solution,press
key when icon appears.
Three point calibration is done, the meter enter in measurement mode
3rd point calibration
Diagram 7 Calibration and measurement process of pH meter
8
4.4.2. Self-diagnosis information During the process of calibration and measurement, the meter has self-diagnosis functions, indicating the relative information as below, please refer to chart 5.
Display Icons
Chart 5 Self-diagnosis information of pH measurement mode
Contents
Check and Fix
Wrong pH buffer solution or the recognition of calibration solution out of range
1. Check whether pH buffer solution is correct. 2. Check whether the meter
connects the
electrode well. 3. Check whether the electrode is damaged.
Press
key when measuring value
is not stable during calibration.
Press
key after
icon appears
During calibration, the measuring value 1. Check whether there are bubbles in glass bulb.
is not stable for 3min.
2. Replace with new pH electrode.
pH electrode performance error zero potential <-60mV or >60mV, slope <75%
1. Check whether there are bubbles in glass bulb. 2. Check whether pH buffer solution is correct. 3. Replace with new pH electrode.
4.4.3. pH temperature principle Please note that the closer the temperature of the sample solution to the calibration solution, the more accurate the readings.
4.4.4. Factory default setting For factory default setting, please refer to parameter setting P1.4 (Item 7.3). All calibration data is deleted and the meter restores to the theory value (zero electric potential of pH is 7.00, the slope is 100%). Some functions restore to the original value (refer to appendix -1). When calibration or measurement fails, please restore the meter to factory default setting and then perform re-calibration or measurement. Please note once set the factory default, all the data deleted will be irretrievable.
4.5. pH Electrode Maintenance 4.5.1. Daily maintenance
The soaking solution contained in the supplied protective bottle is used to
maintain activation in the glass bulb and junction. Loosen the capsule, remove
the electrode and rinse in pure water before taking a measurement. Insert the
electrode and tighten the capsule after measurements to prevent the solution
from leaking. If the soaking solution is turbid or moldy, replace the
solution. (Preparation: 26g KCL dissolved in 100ml pure water).
The electrode should not be soaked in pure water, protein solution or acid
fluoride solution for long periods of time. In addition, do not soak the
electrode in organic silicon lipids.
For best accuracy, always keep the meter clean and dry, especially the and
electrode connectors. Clean with medical cottons and alcohol if necessary.
9
4.5.2. Calibration buffer solution For calibration accuracy, the pH of the standard buffer solution must be reliable. The buffer solution should be refreshed often, especially after heavy use.
4.5.3. Protect glass bulb The sensitive glass bulb at the front of the
combination electrode should not come in contact with hard surfaces. Scratches
or cracks on the electrode will cause inaccurate readings. Before and after
each measurement, the electrode should be washed with pure water and dried. Do
not clean the glass bulb with a tissue for it will affect the stability of the
electrode potential and increase the response time. The electrode should be
thoroughly cleaned if a sample sticks to the electrode. Use a solvent if the
solution does not appear clean after washing.
4.5.4. Renew glass bulb Electrodes that have been used over a long period of
time will become aged. Submerge the electrode in 0.1mol/L hydrochloric acid
for 24 hours, then wash the electrode in pure water, then submerge it in
soaking solution for 24 hours. The method to prepare 0.1mol/L hydrochloric
acid: dilute 9mL hydrochloric acid in pure water to 1000mL. For serious
passivation, submerge the bulb in 4% HF (hydrofluoric acid) for 3-5 seconds,
and wash it in pure water, then submerge it in the soaking solution for 24
hours to renew it.
4.5.5. Clean contaminated glass bulb and junction (please refer to Chart-6)
Chart 6 Clean contaminated glass bulb and junction
Contamination
Cleaning Solutions
Inorganic metal oxide
Dilute acid less than 1mol/L
Organic lipid
Dilute detergent (weak alkaline)
Resin macromolecule
Dilute alcohol, acetone, ether
Proteinic haematocyte sediment
Acidic enzymatic solution (saccharated yeast tablets)
Paints
Dilute bleacher, peroxide
Note: The electrode housing is polycarbonate. When use cleaning solutions, take cautions on carbon tetrachloride, trichlorethylene, tetrahydrofuran, acetone, etc., which will dissolve the housing and invalidate the electrode.
10
5. mV Value Measurement
5.1. Press
key, and switch the meter to mV measurement mode. Connect ORP electrode (need
to purchase separately) and dip it in sample solution, stir the solution briefly and allow it to stay in the
solution until
icon appears and get the reading, which is the ORP value.
ORP stands for Oxidation Reduction Potential. The unit is mV.
5.2. Notes 5.2.1. ORP measurement does not require calibration. When the user is not sure about ORP electrode quality or measuring value, use ORP standard solution to test mV value and see whether ORP electrode or meter works properly.
5.2.2. Clean and Activate ORP Electrode After the electrode has been used over long period of time, the platinum surface will get polluted, which causes inaccurate measurement and slow response. Please refer to the following methods to clean and activate ORP electrode:
(a) For inorganic pollutant, submerge the electrode in 0.1mol/L dilute hydrochloric acid for 30 minutes, then wash it in pure water, then submerge it in the soaking solution for 6 hours.
(b) For organic or lipid pollutant, clean the platinum surface with detergent, then wash it in pure water, then submerge it in the soaking solution for 6 hours.
(c) For heavily polluted platinum surface on which there is oxidation film, polish the platinum surface with toothpaste, then wash it in pure water, then submerge it in the soaking solution for 6 hours.
11
6. Conductivity Measurement
6.1. Conductivity Electrode Information 6.1.1. Conductivity electrode Model 2301T-S plastic conductivity electrode with constant K=1.0 and built-in temperature sensor, can realize automatic temperature compensation. The electrode housing is POM plastic which is corrosion resistant and impact resistant. When submerge the conductivity electrode in solution, stir the solution briefly to eliminate the air bubbles and improve response and stability. 6.1.2. Conductivity electrode constant The meter matches conductivity electrodes of three constants: K=0.1, K=1.0 and K=10.0. Please refer to chart-7 for measuring range. Set constant in parameter setting P2.1 and refer to clause 7.4 Chart 7 Electrode constant and measuring range
Range
Conductivity electrode constant
20 S/cm K=0.1 cm-1
0.5 S/cm~100 mS/cm K=1.0 cm-1
100mS/cm K=10 cm-1
Standard solution
84S/cm 84 S/cm 1413 S/cm 12.88 mS/cm 111.9 mS/cm
6.2. Conductivity Calibration 6.2.1. Conductivity calibration solutions The meter uses conductivity standard solution of 84 S/cm, 1413 S/cm, 12.88 mS/cm and 111.9 mS/cm. The meter can recognize the standard solution automatically, can perform one-point or multipoint calibration (the maximum is four-point calibration). The calibration indication icons correspond to the four standard values ( icon corresponds to two standards). See chart 8: Chart 8 Conductivity standard solution series
Calibration guide icons
Calibration solution series
Range
84 S/cm
0-200 S/cm
1413 S/cm
200-2,000 S/cm
12.88 mS/cm
2-20 mS/cm
111.9 mS/cm
20-200 mS/cm
6.2.2. Calibration intervals (a) The meter is calibrated before leaving the
factory and can generally be used right out of the box. (b) Normally perform
calibration per month. (c) For high accuracy measurements or large temperature
deviation from the reference temperature (25°C), perform calibration per week.
(d) Use conductivity standard solution to check whether there is error.
Perform calibration for large
12
error. (e) For new electrode or factory default setting, perform 3-point or 4-point calibration. Choose closer standard solution to the sample solution to perform 1- point or 2-point calibration.
6.2.3. Reference temperature Reference temperature of factory default is 25°C. Other reference temperature can also be set for range 15°C 30°C. Select per parameter setting P2.2 and see clause 7.4.
6.2.4. Temperature coefficient
The temperature compensation coefficient of the meter setting is 2.0%/°C.
However, the conductivity temperature coefficient is different from solutions
and concentration. Please refer to chart 9 and the data collected during
testing. Set per parameter setting P2.3. and see clause 7.4.
Note: When the coefficient for the temperature compensation is set to 0.00 (no
compensation), the measurment value will be based on the current temperature.
Chart -9 Temperature compensation coefficient of special solutions
Solution
Temperature compensation coefficient
NaCl solution 5% NaOH solution Dilute ammonia solution 10% hydrochloric acid solution 5% sulfuric acid solution
2.12%/°C 1.72%/°C 1.88%/°C 1.32%/°C 0.96%/°C
6.2.5. Avoid contamination of standard solution
Conductivity standard solution has no buffer. Please avoid being contaminated
during usage. Before submerging the electrode in standard solution, please
wash the electrode and allow it dry. Please do not use the same cup of
conductivity standard solution repeatedly, especially for standard solution of
low concentration (84S/cm). The contaminated standard solution will affect
accuracy.
6.3. Conductivity Calibration (take 1413S/cm as an example) 6.3.1. Rinse the
electrode in pure water, allow it to dry, wash with a little of standard
solution and submerge it in standard solution. Stir the solution briefly and
allow it to stay in the solution until a stable reading is reached.
6.3.2. Press
key to enter into the calibration mode.
The meter’s display will show blinking “CAL” at the top right, and scanning and locking process of calibration solution at the bottom right. When the meter locks 1413 mS,
13
stable icon
will display on LCD. Press
key to complete calibration.
The meter will return to measuring mode and left of the LCD screen. See diagram-8.
is displayed on bottom
6.3.3. For multi-point calibration, please repeat clause 6.3.1-6.3.2 until all the calibration is done. The meter can repeat calibration in the same calibration solution until the stable value is reached.
6.3.4. Notes:
a) If press
key before stable icon
appeared on LCD
screen, Error indication icon Er 2 will be shown. See Chart -11.
b) Press
key to exit calibration mode.
6.4. Relations between TDS and Conductivity 6.4.1. TDS and conductivity is linear related. The conversion factor is 0.40-1.00. Adjust the factor from parameter P2.4. The factory default setting is 0.71 and please refer to Item 7.4. The meter only needs to be calibrated in Conductivity mode, then after calibration of conductivity, the meter can switch from conductivity to TDS or salinity.
Diagram- 8
6.4.2 Adjust TDS conversion factor in parameter setting P2.4 according to the
data collected during testing and experience. Chart 10 lists some common use
Conductivity and TDS conversion factors. This is for your reference only.
Chart 10 Conductivity and TDS conversion factors
Conductivity of solution
TDS conversion factor
0-100 S/cm
0.60
100-1,000 S/cm
0.71
1-10 mS/cm
0.81
10-100 mS/cm
0.94
6.5. Sample test 6.5.1. Rinse conductivity electrode in pure water, allow it to dry, and submerge it in the sample solution. Stir the solution briefly and allow it to stay in the sample solution until a stable reading is
reached and
icon appears on LCD, then get the reading value, which is the conductivity value
of the solution.
6.5.2. Press
key to switch to TDS.
6.5.3. During the process of calibration and measurement, the meter has self- diagnosis functions, indicating the relative information as below: chart 11.
14
Chart 11 Self-diagnosis information of conductivity measurement mode
Display Icons
Contents
Checking
Wrong conductivity calibration solution or the meter recognition of calibration solution out of range
1. Check whether conductivity calibration solution is correct.
2. Check whether the meter connects the electrode well.
3. Check whether the electrode is damaged.
Press
key when measuring Press
value is not stable during calibration.
key after
icon appears
During calibration, the measuring value is not stable for 3 min.
1. Shake the electrode to eliminate bubbles in electrode head.
2. Replace with new pH electrode.
6.5.4 Factory default setting For factory default setting, please refer to parameter setting P2.5 (Item 7.4). With this function, all calibration data is deleted and the meter restores to the theory value. Some functions restore to the original value (refer to appendix -1). When calibration or measurement fails, please restore the meter to factory default setting and then perform re-calibration or measurement. Please note once set the factory default, all the data deleted will be irretrievable.
6.6. Conductivity electrode maintenance 6.6.1. Always keep the conductivity electrode clean. Before taking a measurement, rinse the electrode in pure water and better to rinse it again in the sample solution. When submerge the electrode in solution, stir the solution briefly to eliminate air bubbles and allow it to stay until a stable reading is reached. For conductivity electrode which is drily stored, soak the electrode in pure water for 5-10 minutes. Rinse the electrode in pure water after measurement.
6.6.2. The interaction rod of Model 2301T-S conductivity electrode is coated with platinum black to minimize electrode polarization and expand measuring range. The platinum black coating adopted our special processing technology which improves the electrode performance and the firmness of the coating. If the platinum black electrode is stained, gently clean the electrode with soft brush in warm water containing detergent or alcohol.
7. Parameter setting
7.1. Main menu In the measurement mode, press key to enter in P1.0, then press
P1.0P2.0P3.0. Please refer to diagram 9. P1.0: pH parameter setting menu,
P2.0: Conductivity parameter setting menu, P3.0: Basic parameter setting menu.
to switch to main menu:
15
7.2. Submenu 7.2.1. In P1.0 mode, press key to enter in submenu P1.1 of pH
parameter setting, then press key to switch among submenu: P1.1P1.2P1.3P1.4,
see Diagram 9.
7.2.2. In P2.0 mode, press key to enter in submenu P2.1 of conductivity
parameter setting, then press key to switch among submenu:
P2.1P2.2P2.3P2.4P2.5, see Diagram 9.
7.2.3. In P3.0 mode, press key to enter in submenu P3.1 of basic parameter
setting, then press key to switch among submenu: P3.1P3.2P3.3, see Diagram
9.
Main menu of parameter setting
Submenu of pH parameter setting
P1.1 Select pH standard solution P1.2 Select resolution P1.3 Set stability
criteria P1.4 Restore to factory setting
Submenu of Cond. parameter setting P2.1 Select electrode constant P2.2 Select
reference temp P2.3 Adjust temperature
compensation factor P2.4 Adjust TDS factor P2.5 Restore to factory setup
Submenu of basic parameter setting
P3.1 Select temperature unit P3.2 Automatic power-off setup P3.2 Automatic
lock-up setup
Diagram 9 Main menu and submenu of parameter setting
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7.3. Submenu of pH parameter setting (press
key to switch)
P1.1. Select pH standard solution (USA-NIST)
1. In measurement mode, press
key to enter in P1.0 mode,
then press
to enter in P1.1.
2. When press
key, USA blinks, press
key to select
USAnIS, press
to confirm. USA-USA series; nIS-NIST
series.
3. After confirm parameter, press
key to enter in P1.2 mode,
or press
key to return to the measurement mode.
P1.2. Select resolution (0.01 0.1)
1. Press
key, 0.01 blinks, press
key to select 0.010.1,
press
key to confirm.
2. After confirm parameter, press
key to enter in P1.3 mode,
or press
key to return to the measurement mode.
P1.3. Set reading stability criteria (Normal High Low)
1. Press
key, nor blinks. Press
key to select
norHILo, press
to confirm. Nor Normal, Hi High, Lo
Low.
2. After confirm parameter, press
key to enter in P1.4 mode, or
press
key to return to the measurement mode.
P1.4. Restore factory setting (No Yes)
1. Press
key, no blinks. Press
key to select noYES,
press
to confirm, the meter returns to the measurement
mode. No Do not restore, Yes Restore to factory setting.
2. If don’t select Yes, press
key to return to the measurement
mode.
7.4. Submenu of conductivity parameter setting (press
key to switch)
P2.1. Select electrode constant (1.0-10.0-0.1)
1. In P2.0 mode, press
key to enter in P2.1 mode, please refer
to the left Diagram.
2. Press
key, 1.0 blinks, then press
key to select
1.010.00.1, press
key to confirm.
3. After confirm the parameter, press
key to enter in P2.2 mode,
or press
key to return to the measurement mode.
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P2.2. Select reference temperature (15.0°C-30.0°C)
1. Press key, 25.0°C blinks, then press
key to adjust
temperature value 15.0-30.0, press
key to confirm.
2. After confirm parameter, press
key to enter in P2.3 mode, or
press
key to return to the measurement mode.
P2.3. Adjust temperature compensation coefficient (0.00-9.99%)
1. Press
key, 2.00 blinks, press
key to adjust temperature
compensation coefficient 0.00 9.99, press
key to confirm.
2. After confirm the parameter, press
key to enter in mode P2.4
or press
key to return to the measurement mode.
P2.4. Adjust TDS factor
1. Press
key, 0.71 blinks, press
key to adjust TDS factor
0.04 1.00, press
key to confirm.
2. After confirm the parameter, press
key to enter in mode P2.5
or press
key to return to the measurement mode.
P2.5. Restore factory setting (No Yes)
1. Press
key, no blinks. Press
key to select noYES,
press
to confirm, the meter returns to the measurement
mode. No Do not restore, Yes Restore to factory setting.
2. If don’t select Yes, press
key to return to the measurement
mode.
7.5. Submenu of basic parameter setting (press
key to switch)
P3.1. Select temperature unit (°C–°F).
1. In P3.0 mode, press
key to enter in P3.1 mode, please refer to
the left Diagram.
2. Press
key, °C blinks, then press
key to select °C°F,
press
key to confirm.
3. When parameter is confirmed, press
key to enter in mode P3.2
or press
key to return to the measurement mode.
P3.2 Automatic power-off setup (102030On)
1. Press
key, On blinks, press
key to select 102030On
Press
key to confirm.
On turn off automatic power-off; Time unit is minutes.
2. After confirm the parameter, press
key to enter in mode P3.3 or
press
key to return to the measurement mode.
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P3.2 Automatic lock-up setup (OffOn)
1. Press
key, OFF blinks, press
key to select OFFOn,
press
to confirm. Off not set; Onset (the reading is
automatically locked when stabilizes10 seconds.)
2. When Parameter is confirmed, press measurement mode.
key to return to the
8. Meter Kits
No.
Include
Quantity
PH850 EC850 PC850
PH 850 portable pH meter
1 set
EC 850 portable conductivity meter
1 set
PC 850 portable pH/conductivity meter
1 set
201T-F plastic three-in-on pH electrode
1 pc
2301T-S plastic conductivity electrode
1 pc
pH standard buffer solution (4.00 pH /7.00pH/50mL)
1 bottle each
Conductivity calibration solution (1413 S/12.88 mS/50mL)
1 bottle each
Combined electrode clip
1 pc
Portable case
1 pc
Manual
1 book
9. Warranty
We warrant this instrument to be free from defects in material and workmanship
and agree to repair or replace free of charge any malfunctioned or damaged
product attributable to the responsibility of APERA INSTRUMENTS for a period
of THREE YEARS for the instrument and SIX MONTHS for the probe from the
delivery. This limited warranty does NOT cover any issues due to: · Accidental
damage, Improper use · Normal wear and tear · Transportation, Storage ·
Failure to follow the product instructions · Unauthorized maintenance,
modifications, combination or use with any products, materials or other
matter, Unauthorized repair · External causes such as accidents, abuse, or
other actions or events beyond our reasonable control.
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Appendix I: Parameter setting & Factory default setting Modes Prompts Parameter setting items Abbreviation Description
P1.1 Select pH buffer solution
USANIST
Restore to factory default
USA
P1.0 pH
P1.2 P1.3 P1.4
Select resolution
Set reading stability criteria
Restore to factory default setting
P2.1 Select electrode constant
P2.0 Cond.
P2.2 P2.3
Select reference temperature
Adjust temperature compensation coefficient
P2.4
Adjust TDS factor
P2.5
Restore to factory default setting
P3.0 Basic Parameters
P3.1 P3.2 P3.3
Select temperature unit
Automatic Power-off setup
Automatic Lock-up setup
0.010.1
0.01
Normal–High–Low Normal
NoYes
No
1.010.00.1
1.0
15~30
25
0.00~9.99
2.00
0.40~1.00
0.71
NoYes
No
/
°C – °F
°C
102030On
20
/
/
Off
20
Modes
P1.0 pH
P2.0 Conductivity
P3.0 Basic parameters
Appendix II: Abbreviation Glossary
Prompts
Code and abbreviation
In English
P1.1
Standard buffers
Description Standard buffer solution
P1.2 P1.3 P1.4
Resolution
Resolution
Stability criteria
Set up reading stability criteria
Factory default setting Factory default setting
P2.1
Cell
Constant Cell
P2.2 P2.3 P2.4
Reference temperature Reference temperature
Temperature
Temperature
compensation coefficient compensation coefficient
Total dissolved solid
TDS
P2.5
Factory default setting Factory default setting
P3.1
/
/
/
P3.2
Auto close
Automatic Power-off
P3.3
/
/
/
Appendix III: Self-diagnosis information
Icons
Self-diagnosis information
pH
Conductivity
Wrong pH buffer solution or the meter recognition of
calibration solution out of range
Press
key when measuring value is not stable
during calibration
During calibration, the measuring value is not stable for
3min.
pH electrode performance error (zero potentia-60mV or60mV, slope < 75%
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APERA INSTRUMENTS (Europe) GmbH
Address: Wilhelm-Muthmann-Str.18 42329 Wuppertal Germany Email:
info@aperainst.de Website: www.aperainst.de
Tel. +49 202 51988998
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