Cermet II User’s Manual
22 97049 Issue 25.3, October 2016
OPERATION
3.9.1 Manual Pressure Input Calibration
The pressure input channel must be confi gured to the range of the pressure transducer.
This is achieved by setting
CAL to 012 and entering values for offset OFF_2 and scale
SCA_2.
SCA_2 = 0.0062 per 100 psig
OFF_2 = pressure range – ((20,000 x (pressure range\1000))\16)
For example, for a pressure transducer with a range of 0 to 1000 psig:
SCA_2 = 0.0062 x 10 = 0.0620
OFF_2 = 1000 – ((20,000 x (1000\1000))\16) = -250
If you are using a pressure transducer in barg, convert the value to psig using a multiplier
of 14.5. For example, for a pressure transducer with a range of 0 to 100 barg:
SCA_2 = 0.0062 x 14.5 = 0.0899
OFF_2 = 1450 – ((20,000 x (1450\1000))\16 = -362
To exit the
CAL menu, set CAL to 000 and press SETUP six times to return to the main
screen.
3.10 Automatic Pressure Input Calibration
Alternatively, the pressure input can be calibrated using a 4-20 mA source.
1. Connect the current source between pin 2 (-ve) and pin 5 (+ve).
2. Set
CAL to 022 and press SETUP. The monitor will then display
ZEro and fl ash 0.
3. Set the mA source to 4.0 mA and press
SETUP to set 0 at 4 mA.
4. Press
SETUP and the monitor will display SPAn and fl ash the full
scale pressure value.
5. Set the mA source to 20.0 mA and use the or buttons to set
the required pressure range.
6. Press
SETUP to set the required pressure for 20.0 mA.
7. Set
CAL to 000 and press the button to leave the menu.
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