West Control Solutions 8700+ - Manual (Page 136)

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- DIN Controllers & Indicators - Product Manual
59305, Issue 7
– March 2014 Calibration Page 131
15 Calibration Mode
WARNING:
CALIBRATION IS ONLY REQUIRED FOR INSTRUMENTS IN WHICH CALIBRATION ERRORS
HAVE BEEN ENCOUNTERED. REFER TO CALIBRATION CHECK BELOW.
CAUTION:
Calibration must be performed by personnel who are technically competent and
authorised to do so.
Calibration is carried out during manufacture and is not normally required again during the
lifetime of an instrument.
Equipment Required For Checking or Calibrating the Universal Input
A suitable calibration signal source is required for each input type. To verify the accuracy of
the instrument or carry out recalibration, the listed input sources are required, with better
than ±0.05% of the reading accuracy:
1. DC linear inputs: 0 to 50mV, 0 to 10VDC and 0 to 20mADC.
2. Thermocouple inputs - complete with 0ºC reference facility, appropriate thermocouple
functions and compensating leads (or equivalent).
3. RTD inputs: decade resistance box with connections for three-wire input (or equivalent).
Calibration Check
1. Set the instrument to the required input type.
2. Power up the instrument and connect the correct input leads.
Leave powered up for at least five minutes for RTD and DC linear inputs, or at least 30
minutes for thermocouple inputs.
3. After the appropriate delay for stabilisation has elapsed, check the calibration by
connecting the appropriate input source and checking a number of cardinal points.
4. Repeat the test for all required input types.