West Control Solutions ProVU 4 - Manual (Page 130)

ProVU4 Controller, Profiler & Recorder/Controller - Product Manual
59407, Issue 1 – March 2008 Calibration Page 129
14 Calibration
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 Reminder
Calibration of each input type is carried out during manufacture. This can be verified from
Product Information Mode. Recorder versions can provide the user with a calibration
reminder if the application requires regular checks – see Input Configuration for details.
For most applications, re-calibration is not required during the lifetime of the 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
4. Set the instrument to the required input type.
5. Power up the instrument and connect the correct input leads.
Leave powered up for at least five minutes for RTD and DC linear inputs, and at least 30
minutes for thermocouple inputs.
6. After the appropriate delay for stabilisation, check the calibration by connecting the
appropriate input source and checking a number of cardinal points.
7. Repeat the test for all required input types.