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20 MW150 & MW151 Bench Meters
7. pH
7.1. pH PREPARATION
MW150: Up to 3-point calibration with a choice of seven standard buffers.
MW151: Up to 5-point calibration with a choice of 7 standard buffers and, additionally,
calibration with custom buffers (CUST1 and CUST2).
1. Pour small quantities of the selected buffer solutions into clean beakers. Use one
beaker for rinsing and one for calibration.
2. Remove the protective cap and rinse the electrode with the buffer solution for the first
calibration point.
For better accuracy, frequent calibration of the pH sensor is recommended. In addition,
the meter must be recalibrated:
whenever the pH electrode is replaced
after testing aggressive chemicals
when high accuracy is required
when the calibration time out has expired (if the feature is enabled)
at least once a week
7.2. pH CALIBRATION
Custom Buffers (MW151 only)
This feature has to be enabled in Setup. Temperature compensation of custom buffers is
set to the value of 25°C.
When calibrating with custom buffers, the buffer value can be modified by pressing
RANGE/. Use the keys to change the buffer value based on the temperature
reading. After 5 seconds, the buffer value will be updated.
pH
ATC
ºC
pH
ATC
ºC
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