Calibration - Presys DCY-2057 Technical Manual

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Instruments

4.5 - Calibration

The DCY-2057 Controller is accurately calibrated at factory and will not require
periodic recalibration under normal conditions. If, for any reason, a recalibration is
required, follow the procedure described below.
Disconnect the process signals from the Controller I/O terminals.
Prior to carrying out the calibration allow the instrument to warm up for at least
30 minutes to ensure that it reaches stable operating conditions.
This section contains basically two parts: input calibration and output
calibration.
Input calibration
The input calibration describes the procedure to be followed when calibrating
input 1 and input 2.
The accuracy and precision of the reference generating calibration equipment
should be, at least twice as good as the Controller specifications.
References on the following tables relate to the input type to be calibrated. The
column on the right on these tables shows the mnemonics displayed in the calibration
process.
Always check that the internal jumper configuration correctly matches the input
type to be calibrated.
Prior to carrying out the calibration procedure, access Calibration level 8. The
calibration level is provided with a password system which prevents the inadvertent
access to this level and the likelihood of damaging the Controllers calibration
parameters. The access password to this calibration level is number 5.
Once the calibration password is acknowledged, select the input type to be
calibrated within the option ENTR. Select the channel to be calibrated by pressing
ENTER. The display will show the mnemonics corresponding to the references
required by the calibration process. Those references should be entered prior to the
display of the corresponding mnemonic and the calibration procedure is started by
pressing ENTER. At this time the Controller starts the calibration procedure and the
display will flash the mnemonic CAL.
While the display is flashing, the reference should remain connected to the
input channel to be calibrated.
When the display stops flashing and the corresponding mnemonic is back on
screen, the calibration process for the first point will have ended.
Change to the next reference and press the DOWN key to select the next
point. Allow at least 1 minute between any two calibration points. After this time is
elapsed, press ENTER to start calibration of the second point.
After running through the two references on the table relative to the input type
to be calibrated the calibration process will have been completed.
DCY - 2057 Pressure Controller
Maintenance
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