TRIPLETT CD100 Conductivity/TDS/Salinity/Temperature Meter User Manual

: June 6, 2024
: TRIPLETT

TRIPLETT CD100 Conductivity/TDS/Salinity/Temperature Meter

CD100 Conductivity TDS Salinity Temperature Meter fig
1

Introduction

Thank you for selecting the Triplett CD100 Conductivity/Total Dissolved Solids (TDS) / Salinity meter. With the CD100’s dynamic cell-constant technology it is possible to measure a wide range of Conductivity, TDS, and Salinity with the same electrode. Careful use and maintenance provide years of reliable service.

METER DESCRIPTION

Battery compartment cap
LCD Display
MODE / HOLD button
CAL / RECALL button
ON/OFF button
Electrode collar
Conductivity Electrode

LCD DISPLAY

Bar graph reading
Measurement Units
Main Display
RENEW Indicator
HOLD Indicator
RANGE Calibration Indicator
Low Battery Indicator
Temperature Display

Powering On

The CD100 uses four (4) CR2032 Lithium Ion Batteries (included). If the batteries are weak, the ‘Low Battery’ indicator appears on the LCD. Press the ON/OFF key to turn the CD100 on or off. The auto power off feature shuts the CD100 off automatically after 10 minutes of inactivity to preserve battery life.

Getting Started

Remove the cap from the bottom of the CD100 to expose the conductivity electrodes.
Before the first use or after storage, rinse the electride in water and dry.
For best results, calibrate for conductivity with a standard in the expected range of the sample. For maximum accuracy calibrate from low conductivity value standards to high-value standards.
Store dry.

Measurement Procedure

Sample Preparation:

For Conductivity, TDS or Salinity place the test sample in a sample cup with enough depth (2.5cm minimum) to cover the electrode. Stir the solution to remove any air bubbles.

Measurement:

Press the ON button. (and then “SELF CAL” will appear in the display during the turn-on diagnostics)
Depress and hold the MODE/HOLD key to scroll to the desired measurement mode.
Insert the electrode into the sample making sure that the electrodes are completely submersed.
Slowly stir the solution with the electrode to remove air bubbles.
The meter will auto-range to the proper range and then display the reading.

Changing Measurement Function

The meter can be set to measure Conductivity, TDS or Salinity. To change the mode:

Press and Hold the MODE/HOLD button for 2 seconds and the display will begin to scroll through the units.
µS (Conductivity); ppm S (Salinity); ppm (TDS); mg/l (TDS);
Note: The “HOLD” function cannot be on when changing the measurement function. If “HOLD” is displayed in the lower left corner of the display, briefly press the MODE/HOLD button to turn it off.
When the desired units are displayed, release the MODE/HOLD button.

TDS Compensation Ratio

The TDS value is determined by multiplying a conductivity reading by a known ratio factor. The meter allows for selecting a conversion ratio in the range of 0.40 to 1.00. The ratio varies with the application, but is typically set between 0.50 and 0.70.
Note: The stored ratio will briefly appear in the lower temperature display when the meter is first turned on, or when changing measurement function to TDS.
Note: In the Salinity mode the ratio is 0.40 to 0.60 auto.
To change the ratio, while in the TDS measurement mode (ppm or mg/l):

Press and release the CAL/RECALL button twice in succession. The stored ratio will appear in the display.
Press the MODE/HOLD button to increase the ratio value in steps of 0.01.
When the desired ratio is displayed, press and release the CAL/RECALL button to store the value and return to the normal mode.
If no buttons are pressed for 5 seconds, the meter returns to measure mode.

Storing Readings

Press the MODE/HOLD button to store a reading. The storage location number will be displayed on the lower display, while the main display shows the stored reading. The meter will enter the HOLD mode and the “HOLD” indicator will appear.
Press the MODE/HOLD button again to exit the HOLD mode and return to normal operation.
If more than 25 readings are stored, previously stored readings (starting with number 1) will be overwritten.

Recalling Stored Readings

Press the CAL/RECALL button and then press the MODE/HOLDbutton. A location number (1 through 25) will briefly appear and then the value stored in that location will appear. The displayed units will flash, indicating that the storage recall mode is active.
The last stored reading will be displayed first. Pressing and releasing the MODE/HOLD button will scroll through the stored readings one at a time. The location number is displayed first, followed by the reading stored in that location.
To exit the storage mode, press the CAL/RECALL button and the meter will return to normal operation, after displaying “End”.

Clear Stored Memory

With the unit on, press and hold ON/OFF for 4 seconds. “CLr” will be briefly displayed when the memory is cleared.

Changing Temperature Units

To change the displayed temperature units (oC or oF):

With the unit OFF, press and hold down the CAL/RECALL button.
With the CAL/RECALL button depressed momentarily press the ON/OFF button. When “SELF CAL” appears in the display release the CAL/RECALL button. The unit will power on with temperature displayed in the new units.

Data Hold Mode

Press the MODE/HOLD button to hold (freeze) a reading in the display. The meter will enter the HOLD mode and the “HOLD” indicator will appear.
Note: This also stores the reading.
Press the MODE/HOLD button again to return to normal operation.

Auto Power OFF
The auto power off feature automatically shuts the meter off 10 minutes after the most recent button press.

Auto Power OFF Disable
To disable the Auto Power Off feature:

1. Turn the unit on.
2. Press CAL/RECALL once (Quickly)
3. Immediately and simultaneously press the MODE/HOLD and ON/OFF buttons for approximately 2 seconds, until “oFF” is briefly displayed
To disengage this feature, turn the unit off with the ON/OFF button. The next time the unit is powered up, Auto Power OFF mode will be engaged again.

Low Battery Indication

When the batteries become weak the icon will appear in the display. Refer to the Maintenance section for battery replacement information.

Measurement and Display Considerations

If the unit appears to be locked (display frozen). It is possible that the Data Hold mode has been inadvertently accessed by pressing the MODE/HOLD button. (“HOLD” will be displayed in the bottom left of the LCD.) Simply press the MODE/HOLD button again or turn the meter off and then on.
For maximum accuracy, allow sufficient time for the temperature of the probe to reach the temperature of the sample before calibrating. This will be indicated by a stable temperature reading on the display.

Reset Calibration Data

Follow this procedure to clear all calibration data from the meter. Resetting the calibration data may be necessary when new calibration solutions are used or accuracy of measurements is in question.

Turn off the meter.
Press and Hold the Cal/Recall and Mode/Hold buttons.
Momentarily press the On/Off button, as soon as the display comes on, release all 3 buttons.
The display will show “dFLt rSt” (default reset) and all of the calibration data will be erased. If “dFLt rSt” does not appear, retry the procedure.
Proceed to the calibration routine for Conductivity.

Calibration – Conductivity

Meter accuracy verification should be performed on a periodic basis. Once per month is the recommended cycle for normal use. If calibration is required, a conductivity standardizing solution must be obtained. The meter can be calibrated in any or all of the three ranges. Standardizing solutions of 84µS/cm, 1413µS/cm or 12.88mS/cm (12,880µS/cm) are used for the automatic calibration recognition procedure. No other calibration values are permitted. Calibration is always done in conductivity mode. Since salinity and TDS values are calculated from conductivity values, this procedure also calibrates the salinity and TDS ranges. Fill a sample cup with the standardizing solution.

Turn the meter ON and insert the electrode into the solution. Tap or move the electrode in the sample to dislodge any air bubbles.
Press and hold the CAL/RECALL button (approximately 2 seconds) until “CAL” appears in the lower (temp) display. The main display will start flashing.
The meter will automatically recognize and calibrate to the standardizing solution. The display will briefly indicate “SA”, End and then return to the measurement mode after a calibration.
Note: The “SA” will not appear if the calibration fails.
The “range calibrated” symbol will appear in the display for each range that is calibrated during that power on cycle.

Low range, 84µS/cm
Medium range, 1413µS/cm
High range, 12.88mS/cm (12,880µS/cm)

Note: Each time the calibration mode is entered all calibration symbols on the display are cleared, but only the calibration data for the currently calibrated range is replaced. The other two ranges keep the existing calibration data, just the symbols are removed. Calibration of all three ranges must be performed during one power on period for all three range calibration symbols to appear.
See Reset Calibration Data to clear all calibration data from the meter.
Note: The meter allows for a 1, 2 or 3 point calibration. If calibration is done for more than one point the lowest value standard should be done first to obtain the best accuracy.

Considerations and Techniques

Do not touch the inner surfaces of the conductivity electrodes. Touching the surface of the platinized electodes may damage and reduce the life of the probe. Store the electrode dry, in the storage cap.

Specifications

Display: 2000 count LCD with Bargraph
Conductivity ranges 0.0 to 199.9µS: 200 to 1999µS:2.00 to 19.99mS
TDS ranges 0.0 to 99.9ppm or mg/L
(Variable ratio) 100 to 999ppm or mg/L:1.00 to 9.99ppt or g/L
Salinity range 0.0 to 99.9ppm:100 to 999ppm:1.00 to 9.99ppt
TDS Ratio 0.40 to 1.00 adjustable
Salinity Ratio 0.40 to 0.60 auto
Conductivity ATC 2.0% per oC
Conductivity ATC Range 32.0°F to 140oF (0.0°C to 60.0oC)
Temperature Range 32.0°F to 194oF (0.0°C to 90.0oC)
Temperature Resolution 0.1 up to 99.9, 1 >100
Temperature Accuracy ±1.8°F; 1°C
Accuracy Conductivity: ±2% full scale
TDS: ±2% full scale:Salinity: ±2% full scale
Measurement Memory 25 tagged (numbered) readings
Low battery indication ‘ ’ appears on the LCD
Power Four (4) CR2032 Lithium Ion Batteries
Auto power off After 10 minutes (override available)
Operating conditions 23°F to 122oF (-5°C to 50oC)
Dimensions 1.5 x 7.8 x 1.5” (38 x 198 x 38 mm)
Weight 3.3 oz (95 g)

Maintenance

Battery Replacement

Twist off the battery compartment cap
Replace the four (4) 2032 batteries observing polarity.
Replace the battery compartment cap

Electrode Replacement

To remove an electrode, unscrew and completely remove the electrode collar (turn the collar counter-clockwise to remove).
Gently rock the electrode from side to side, pulling it downwards, until it disconnects from the meter.
To attach an electrode, carefully plug the electrode into the meter socket (note that the electrode connector is keyed, ensuring proper connection).
Tighten the electrode collar firmly enough to make a good seal (a rubber gasket seals the electrode with the meter).

Cleaning Recommendations

When cleaning the probe, take care not to scratch or damage the sensing surface or the platinized electrode surfaces.

*Contaminant*	*Cleaning Solution*	*Instructions*
Water soluble substances	Deionized water	Soak or scrub with a soft brush.

Rinse thoroughly with DI

water and dry.

Grease & Oil| Warm water and household detergent| Soak or scrub with a soft brush, maximum of 10 minutes. Rinse thoroughly with DI

water, and dry.

Heavy grease & Oil| Alcohol| Maximum of 5 minute soak, scrub with a soft brush. Rinse thoroughly

with DI water, and dry.

Lime and hydroxide coatings| 10% acetic acid| Soak until coating dissolved, maximum of 5 minutes. Rinse

thoroughly with DI water, and dry.

Warranty

Triplett / Jewell Instruments extends the following warranty to the original purchaser of these goods for use. Triplett warrants to the original purchaser for use that the products sold by it will be free from defects in workmanship and material for a period of (1) one year from the date of purchase. This warranty does not apply to any of our products which have been repaired or altered by unauthorized persons in any way or purchased from unauthorized distributors so as, in our sole judgment, to injure their stability or reliability, or which have been subject to misuse, abuse, misapplication, negligence, accident or which have had the serial numbers altered, defaced, or removed. Accessories, including batteries are not covered by this warranty
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