Yokogawa ISC450 4-Wire Analyzer for Inductive Conductivity - Manual (Page 47)

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IM 12D06D05-01E
6
CALIBRATION
6-7. Temperature calibration
In order to make the most accurate measure-
ments, it is important to have a precise temper-
ature measurement. This affects the display of
temperature, and the output signal when used.
More important, however, is the temperature
compensation, and calibration accuracy.
The temperature of the sensor system should
be measured independently with a high preci-
sion thermometer. The display should then be
adjusted to agree with the reading (zero offset
calibration only). For best accuracy this should
be done as near to the normal operating tem-
perature as possible.
Press the key and choose “ Execute: Cali-
bration. ” Press “ Temperature calibration ” to
execute it.
6-8. Operation of hold function during cali-
bration
EXAxt ISC450G has a HOLD function that will
suspend the operation of the control/alarm re-
lays and mA-outputs.
During calibration, the user may choose to
enable HOLD so that the output signals are
frozen to a “ last ” or “ fixed ” value. Some users
will choose to leave the outputs “ live ” to record
the calibration event. This has implications
for pharmaceutical manufacture, for example,
where an independent record of calibrations is
mandatory.
Press to select Execute: “ HOLD ” and then
choose “ Manual Hold ON ” or “ Manual Hold
OFF ”. This allows you to set up manual hold.
To cancel manual hold, press the lit HOLD sec-
tion on the Main display.
Press “ HOLD ” button on mainscreen, to re-
move the HOLD.
The route for HOLD setup is
Commissioning >> Output setup>> Config-
ure Hold