NAVI F-52, Instruction Manual

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Chapter 3 pH MEASUREMENT
3.4 Calibration Setting
F-52, 53, 54, 55 49
3.4.6 Periodical check mode setting
Periodical check is a function to see if the meter and the electrode are maintained in good con-
dition. The recommended check interval is once every three months.
There are three modes for the periodical check: JIS, NIST BUFFER, or SIMULATOR.
JIS mode
JIS mode is a check mode conforming to JIS(Z8802-1984).
Combination of electrode and meter can confirm which form of JIS regulation is conformed,
using the standard solutions of pH7, pH4, and pH9.
NIST BUFFER mode
NIST BUFFER mode is a check mode conforming to the revised regulations by the Japanese
Pharmacopoeia(JP)
After measurement by standard solutions of pH7 and pH4, the measurement of the solution of
pH7 is given five times, and the repeatability is confirmed.
SIMULATOR mode
Optional pH checker (X-51) checks the meter only (electrode check is not included).
JIS and NIST BUFFER are the modes recommended by HORIBA, and not completely the
same with configurations of JIS or NIST. It may not follow the possible revision or amendment
given by JIS or NIST.
The calibration status displayed during check may not always show the actual checking sta-
tus.
Setting procedure
1.
In the pH CALIBRATION SETUP
screen, press
↑
or
↓
key to go to
SYSTEM CHECK field.
2.
Press
←
or
→
key, and select from
JIS(pH7,4,9), NIST BUFFER (pH7,
4) or SIMULATOR (X-51).
3.
Press F4 (RETURN) to reflect the
setting. The display returns to the
pH Measurement screen.
For F-53:
The pH calibration and check setting is avail-
able for each channel (CH).
The checked values by the periodical check are not memorized as calibrated values.