Calibrating Residual Chlorine; Adjustment Calibration Using Sample Water <Residual Chlorine - horiba TW-150 Instruction Manual

4 CALIBRATION
4.8

Calibrating Residual Chlorine

There are three calibrating patterns for residual chlorine, not including automatic zero
calibration.
See "4.1 Calibration Patterns and Cycles" (page 17) and select one of the patterns.
It is necessary to prepare span calibration solution, however, it is difficult to prepare residual-
chlorine solution with correct concentration and the concentration may change soon after
preparation. To achieve correct calibration, adjustment with sample water is recommended
instead.
See "5.3 Automatic Zero Calibration" (page 82) for automatic zero calibration settings.
4.8.1 Adjustment calibration using sample water <residual chlorine>
MEASUREMENT screen
See "4.3 Displaying the Calibration Screen" (page 23).
Preparation

Residual-chlorine meter...1

Calibration procedure

1. Measure residual chlorine of the prepared sample water using a residual chlorine
meter other than this device's and calculate the value.
2. Press the SAMPLE VALUE button ([x.xx]) on the FRC. CAL. screen.
The sample water calibration value input screen is displayed.
3. Enter the measured value of the sample water using the numerical key pad and
press [SET].
Input range: 0.00 mg/L to 5.00 mg/L
Tip
[CLEAR]: Clears the whole value.
[BACK]: Deletes the rightmost number of the value.
The screen returns to the FRC. CAL. screen.
62
[CAL.]
CALIBRATION screen
[x.xx]
[FRC.]
FRC. CAL. screen