Citizen CBM-910 Type II Instruction Manual download pdf (Page 53)

Chapter 3 pH Measurement

F-72 41

3.3 Checking Before Use

When the preliminary check function is ON, you can check repeatability with pH7 standard

solution. Use this function to check measurement accuracy by checking repeatability.

An operation guide is displayed after the 2nd point calibration is completed. Check the

repeatability according to the operation guide.

This preliminary check function is possible only when the standard solution is set to

NIST, USA, or China.

When the standard solution is set to CUSTOM, this function can not performed.

1. When calibration for all of the points is

completed, the repeatability is automatically

checked.

2. This repeatability check confirms the deviation

from the calibrated value by the standard

solution of pH7.

For example, the sequence for the 2nd point cal-

ibration by pH7 and pH4 is as follows.

pH7 (Calibration of 1st point) --> pH4 (Calibra-

tion of 2nd point) --> pH7 (Repeatability check

with the calibrated value by 1st point)

Screen display Repeatability

OK(0) Within ±0.005 pH

OK(1) Within ±0.02 pH

OK(2) Within ±0.05 pH

ERROR Over ±0.05 pH

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 113 114

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Citizen CBM-910 Type II Instruction Manual Page 53