Hart Resistor Selection; Measuring Pressure - Omega PCL1200 User Manual

Portable, high accuracy multifunction calibrator

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5.2-1 HART Resistor Selection

The PCL1200 can be set-up so that the 250 ohm resistor required for

Hart con guration devices resides inside the PCL1200. Enabling the

PCL1200's internal 250 ohm resistor eliminates the need to manually

add a series resistor during a Hart calibration process.

NOTE: When the PCL1200's internal 250 resistor is enabled, maximum

load driving capability drops from 1000 ohms @ 20mA to 750 ohms

@20mA.

Enable/Disable Procedure

1. Remove the battery cover and remove the 2 screws that are at

the top of the case.

2. Remove the 2 screws on the bottom or lower portion of the case.

3. Gently remove the top half of the case from the bottom.

4. Figure 10a. shows the location of the Hart jumpers.

Note: The OMEGA Pressure Module connector 700mA needs to be

purchased to connect pressure module to calibrator.

Note: The PCL1200 is compatible with OMEGA Calibrator Pressure

Modules. The accessory PCL-PMA is required for pressure measurement.

Note: Pressure is not read from modules with frequency or pulse train

mode enabled.

To avoid a violent release of pressure in a pressurized system, shut o the

valve and slowly bleed o the pressure before you attach the pressure

module to the pressure line.

To avoid mechanically damaging the pressure module, never apply more

than 10 ft-lb. of torque between the pressure module ttings, or between

the ttings an the body of the module.

Warning!

Caution

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