Ph Test; Introduction; Test Procedure; Routine Maintenance - MERCK LSI Kit Guide De Référence Rapide

pH Test

Introduction

This test is designed to measure the pH of tap water.

Test procedure

Battery
compartment
LCD
ON/OFF/MODE
button
pH electrode

Routine maintenance

While not in use, rinse the electrode with tap water to minimize contamination. Store it with a
few drops of pH 7 solution in the protective cap.
DO NOT USE DISTILLED OR DEIONIZED WATER FOR STORAGE PURPOSES.

Calibration

For better accuracy, frequent calibration of the instrument is recommended.
For a two-point calibration, place the electrode in pH 7.00 buffer.
1. From normal measuring mode, press and hold the MODE button until OFF on the
secondary LCD is replaced by CAL.
2. Release the button. The LCD enters the calibration mode displaying "pH 7.00 USE".
After 1 second the meter activates the automatic buffer recognition feature. If a valid buf-
fer is detected then its value is shown on the primary display and "REC" appears on the
secondary LCD. If no valid buffer is detected, the meter keeps the USE indication active
for 12 seconds, and then it replaces it with "WRNG".
3. After the first calibration point has been accepted, the "pH 4.01 USE" message appears.
Place the electrode in pH 4.0 buffer. The message is held for 12 seconds, unless a valid
buffer is recognized. If no valid buffer is recognized, then the "WRNG" message is shown.
If a valid buffer is detected, then the meter completes the calibration procedure.
4. When the buffer is accepted, the LCD shows the accepted value with the "OK 2" message,
and then the meter returns to the normal measuring mode.
Note: When the calibration procedure is completed, the CAL tag is turned on.
Release 07/2015
SET/HOLD
button
Temperature
sensor
pH meter
Water Analysis Kit - LSI Kit
1. Press and hold ON/OFF/MODE button.
2. Submerge the electrode in the solution while
stirring it gently.
The measurement should be taken when the
stability symbol on the top left disappears.
3. The pH value automatically compensated
for temperature is shown on the primary
LCD while the secondary LCD shows the
temperature of sample.
4. While in measurement mode, press the
SET/HOLD button.
HOLD appears and the reading will be
frozen on the LCD.
5. Press the ON/OFF/MODE button.
OFF will appear on the secondary display.
Release the button.
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