APERA INSTRUMENTS PH20 Value pH Tester Instruction Manual

APERA INSTRUMENTS PH20 Value pH Tester

Battery Installation

Please install batteries according to the following steps. *Please note the correct direction of battery installation:

The Positive Side (“+”) OF EVERY SINGLE Battery MUST FACE UP. (WRONG INSTALLATION OF BATTERIES WILL CAUSE DAMAGE TO THE TESTER AND POTENTIAL HAZARDS!)

Upgrade Note

The new PH20 Tester comes with an upgraded probe structure, which is equipped with a sensor shield that prevents the glass bulb breakage from accidental collision (see picture below). Users can remove the shield when cleaning the sensor and put it back on after cleaning.

Keypad Functions

• Short press——- < 2 seconds
• Long press——– > 2 seconds

|

1. Short press to turn on, long press to turn off;
2. When turned off, long press to enter setup;
3. In mode setting, short press to change parameter;

---|---

|

1. When turned on, long press to enter calibration mode.
2. In calibration mode, short press to confirm calibration;
3. In mode setting, short press to confirm parameter selection.

Complete Kit

Things needed in addition to what’s in the box

A clean cup, distilled water (8-16oz), and tissue papers for rinsing and drying the probe.

Calibration

1. If it’s first-time use or the tester hasn’t been used for a long time, pour some pH 4.00 solution to the Fill line in the probe cap, soak probe for about 15 minutes to hydrate the pH sensor.
2. Short press to turn on. Rinse in distilled water; shake the meter in the air and use tissue paper to dap off excess water.
3. Long press to enter calibration mode; Short press to exit.
4. Insert the probe in the 7.00 pH calibration solution; Stir gently; leave it to stand; Wait for the smiley face to appear and stay on the screen (see Diagram 3); short press to complete 1st point calibration, tester returns to measurement mode; calibration icon M displays on button left side of the screen.
5. Rinse probe in distilled water. Long press to enter calibration mode; insert the probe in the pH 4.00 calibration solution, stir gently; leave it to stand; wait for the smiley face to appear and stay on the screen; then short press to complete the 2nd point calibration, tester returns to measuring mode, calibration icons L M display on bottom left side of LCD.

Notes: Tester will automatically recognize pH buffer solution, users can choose calibration points: 1 point, 2 points, or 3 points. But the 1st point calibration must be in calibration solution of 7.00 pH, then followed by 2nd or 3rd point calibration. For details, please refer to the following table:

 | Calibration Solution| Calibration

Indication icon

| Recommended Accuracy

and Range

---|---|---|---
1-point

Calibration

| 7.00 pH| M| Accuracy ≥ 0.3 pH

2-point Calibration

| 7.00 pH and 4.00 pH| L  M| Measuring Range <8.5 pH
7.00 pH and 10.01 pH|

M  H

| Measuring Range>8.5 pH
3-point

Calibration

| 7.00 pH, 4.00 pH

and 10.01 pH

|

L   M  H

| Wide measuring range

• Automatic self-diagnostic information: if measured value is far off to the preset range, LCD will display “Er1”; In calibration mode, if the measured value hasn`t been stable, i.e. has not been staying on LCD, pressing will cause LCD to display “Er2”.

Measurement

1. Short press to turn on the tester. Rinse probe in distilled water, shake the meter in the air and dap it with tissue paper to remove excess water.
2. Stir probe in sample solution gently, leave it to stand. Get readings after comes up and stays.

Notes

• If you see some white crystalline solid leaked out of the pH probe, that’s the reference solution (3M KCL) inside the probe. It is NOT a sign of any defective issue. It is a normal phenomenon when the probe is stored dry for a period of time. It proves that the junction of the probe is working well. Users can simply rinse the probe in distilled water to remove the solids and use the tester as usual.
• After each test, users should rinse the pH probe thoroughly with distilled water or purified water.
• For the premixed pH calibration buffer solutions, we recommend replacing them after 10 to 15 times of use to keep its accuracy.
• This meter will NOT give accurate or stable pH readings when testing distilled or deionized water. This is because distilled or deionized water do not have enough ions present for the electrode to function properly. To measure distilled or deionized water’s  pH, users need to use a specialized instrument. Contact us at info@aperainst.com for more details. When testing purified water like spring water or drinking water, it will take longer for the readings to get stabilized (typically 3-5 minutes) because there is very few ions left to be detected by the sensor in those purified water.
• Do NOT store probe in purified water because that will cause permanent damage to the pH probe. Purified water is only recommended for rinsing the probe. The probe should be stored in 3M KCL pH electrode storage solution (SKU AI1120) for best accuracy.
• Do NOT use any other brand’s storage solutions because different chemicals may be used and potential permanent damage could be caused to the meter.
• Storing the probe dry will NOT cause permanent damage to it. It will only temporarily cause the probe to lose its sensitivity, which can always be restored by soaking in the storage solution or pH4.00 calibration solution.

Parameter Setting

Setting Schedule

Prompt Mark|

Parameter Setting Items

|

Code

| Factory Default
---|---|---|---
P1| Select pH buffer| USA – NIST| USA
P2| Select Temperature Unit| ˚F – ˚C| ˚C
P3| Back to Factory Default| No – Yes| No

Parameter Setting

When turned off, long press to enter setup → short press to switch P1-P2-P3→ Short press , parameter flashing→short press to choose, short press to confirm parameter selection→Long press to go back to measurement mode.

Parameter Setting Instruction

Select standard pH buffer solution (P1): There are two options of standard buffer solutions: USA series and NIST series as the following chart:

Icons

| pH standard buffer solution series
---|---
USA series| NIST series

Three-Point calibration

| L| 1.68 pH and 4.00 pH| 1.68 pH and 4.01 pH
M| 7.00 pH| 6.86 pH
H|

10.01 pH and 12.45 pH

|

9.18 pH and 12.45 pH

For the self-diagnosis information, please refer to the table below:

|

Wrong pH calibration solution, which exceeds the recognizable range of the meter.

|

1. Check if calibration solution is correct
2. Check if probe is damaged.
3. Check if there is any air bubble in the glass bulb sensor

|  Is pressed before measurement is stable (  appears and stays)| Wait for the smile icon to appear and stay, then press

• If you find any air bubble in the glass bulb of the pH sensor, simply shake the probe for a few times to remove it. The existence of an air bubble in the glass bulb will significantly decrease the accuracy of measurement.
• The 1st point calibration must be 7.00 pH. Perform the 2nd point calibration (4.00 pH) immediately after the 1st point. Do NOT turn off the meter before you conduct 2nd point calibration. If the meter is turned off after 1st point calibration, users will need to restart the calibration process with the 7.00 pH and the 4.00 pH following after. Calibrating directly in pH 4.00 after turning meter off and back on will cause Er1.

Technical Specifications

pH

| Range| 0 – 14.0 pH
---|---|---
Resolution| 0.1 pH
Accuracy| ±0.1 pH
Calibration Points| 1 – 3 points
Automatic Temperature Compensation| 0 – 50˚C (0 – 122˚F)

Temp.

| Range| ****

0 – 50˚C (0 – 122˚F)

Resolution| ****

0.1 ˚C

Accuracy

| ****

±0.5˚C

1. Calibration points indication: L M H
2. Stable Measurement: appears and stays on the screen
3. Self-Diagnostic information: Er1, Er2
4. Low-Voltage warning: flashes, reminder of battery replacement
5. Auto Power-Off in 8 minutes if no operation.

Warranty

We warrant this instrument to be free from defects in material and workmanship and agree to repair or replace free of charge, at option of APERA INSTRUMENTS (Europe) GmbH, any malfunctioned or damaged product attributable to the responsibility of APERA INSTRUMENTS (Europe) GmbH for a period of TWO YEARS (SIX MONTHS for the probe) from the delivery.

This limited warranty does not cover any damages due to

Transportation, storage, improper use, failure to follow the product instructions or to perform any preventive maintenance, modifications, combination or use with any products, materials, processes, systems or other matter not provided or authorized in writing by us, unauthorized repair, normal wear and tear, or external causes such as accidents, abuse, or other actions or events beyond our reasonable control.

APERA INSTRUMENTS (Europe) GmbH

• Wilhelm-Muthmann-Straße 18 42329 Wuppertal, Germany
• Contact: info@aperainst.de
• Website: www.aperainst.de
• Tel:  +49 202 51988998

References

• Apera Instruments

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