Honeywell DR4500A - Page 206

Input Calibration - Calibration Procedure
192 DR4500A Classic Series Circular Chart Recorder With or Without Control Product Manual Release M
April 2017
Step
Operation
Press
Action/Result
2
(cont)
Using Ambient
Temperature Method
ATTENTION
If you are using the Ambient
Temperature method to calibrate a thermocouple input,
be sure to measure the temperature at the input
terminals and subtract the equivalent millivolt value (for
your particular thermocouple) from the 0% value just
prior to doing calibration.
For example, for a Type J Thermocouple and input
temperature of 68°F:
From –0.885 mV (Type J @ 0°F)
Subtract –1.019 mV (Type J @ 68°F)
To yield –1.904 mV (calibrator output
for INn ZERO)
3
Calibrate 100%
FUNC
You will see:
Upper Display: APPLY
Lower Display: INn SPAN n = 1 or 2
Adjust your calibration device to an output signal equal
to the 100% range value for your particular input
sensor, see Table 7-2 for voltage or resistance
equivalents, wait 30 seconds, and
If …
Then …
you are calibrating a
thermocouple input
Go to
step 4
you are calibrating other than a
thermocouple input
Go to
step 5
Using Ambient
Temperature Method
ATTENTION
If you are using the Ambient
Temperature method to calibrate a thermocouple input,
be sure to measure the temperature at the input
terminals and subtract the equivalent millivolt value (for
your particular thermocouple) from the 100% value.
For example, for a Type J Thermocouple and input
temperature of 68°F:
From 50.059 mV (Type J @ 1600°F)
Subtract –1.019 mV (Type J @ 68°F)
To yield 49.040 mV (calibrator output
for INn SPAN)