Hart Tm Resistor Selection; Measuring Pressure - Ecom Instruments MCAL 4200 Instruction Manual

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5.2-1 HART Resistor Selection
The MCAL 4200 can be set-up so that the 250 ohm resistor required for Hart
devices resides inside the MCAL 4200. Enabling the MCAL 4200's internal 250 ohm resistor
eliminates the need to manually add a series resistor during a Hart
NOTE: When the MCAL 4200'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

5.3 Measuring Pressure

Note: The ecom Pressure Module connector 700mA needs to be purchased to connect
pressure module to calibrator.
Note: The MCAL 4200 is compatible with BETA Calibrator Pressure Modules. The accessory
BPPA-100 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 off the valve and slowly
bleed off the pressure before you attach the pressure module to the pressure line.
To avoid mechanically damaging the pressure module, never apply more than 13.6 Nm
(10 ft-lb.) of torque between the pressure module fittings, or between the fittings an the body of
the module. To avoid damaging the pressure module from overpressure, never apply pressure
above the rated maximum printed on the module.
To avoid damaging the pressure module from corrosion, use it only with specified materials.
Refer to the pressure module documentation for material compatibility.
To measure pressure, follow these steps:
1. Connect the pressure module to the calibrator as shown in Figure 18.
The calibrator can measure pressure on both the upper and the lower display. This makes it
possible to measure pressure in two different units at the same time.
jumpers.
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Warning!
Caution
configuration
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calibration process.
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