Viatran IDP10-A, Инструкция по установке, калибровке и эксплуатации

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98MANALIDP10AV Rev. A 8/16/11
For field calibration, an adjustable air supply and a pressure measuring device are required. For
example, a dead weight tester or an adjustable clean air supply and pressure gauge can be used.
The pressure source can be connected to the transmitter process connection with pipe fittings or it
can be connected to the vent screw assembly using a calibration screw. The calibration screw has a
Polyflo fitting and can be used for pressures up to 700 kPa (100 psi). It is available from Viatran.
NOTE
For high differential calibrations above 700 kPa (100 psi), calibration screw
B0142NA can be used along with high pressure Swagelok fittings having a rating of
21 MPa (3000 psi), or more.
To set up the equipment, refer to Figure 18 and use the following procedure.
1. If the transmitter is in operation, follow the procedure on “Taking the Transmitter
Out of Operation” on page 23.
! CAUTION
With liquid service, drain both sides of transmitter to avoid calibration errors.
2. If a calibration screw is being used, remove the vent screw and replace it with the
calibration screw. Connect the pressure source to the calibration screw using
6 x 1 mm or 0.250 inch tubing.
If a calibration screw is not being used, remove the entire vent screw assembly or drain
plug (as applicable) from the high pressure side of the transmitter. Connect
calibration tubing using a suitable thread sealant.
3. Close the bypass valve opened in Step 1.
4. Complete the setup shown in Figure 12.
NOTE
For vacuum applications, connect the calibrating pressure source to the low pressure
side of the transmitter.
5. If calibrating the 4 to 20 mA output signal, also connect equipment as shown in
Figure 19.