Calibrating A Pressure Transmitter; Remote Operation; Setting Up The Rs-232 Port For Remote Control - Ecom Instruments MCAL 4200 Instruction Manual

6.4 Calibrating a Pressure Transmitter

To calibrate a pressure transmitter, use these steps:
1. Select upper display from the Main Menu, and choose current [mA LOOP] from the primary
parameters. Return to Main Menu.
2. Select lower display, and choose [PRESSURE] from the primary parameters.
3. Connect the calibrator to the transmitter and the pressure module as in Figure 22.
4. Zero the pressure module.
5. Test the transmitter at 0 % and 100 % of the span, and adjust as necessary.
Figure 22. Calibrating a Pressure Transmitter
7. Remote Operation
The calibrator can be remotely controlled using a PC terminal, or by a computer program
running the calibrator in an automated system. It uses an RS-232 serial port connection for
remote operation. With this connection the user can write programs on the PC, with Windows
languages like Visual Basic to operate the calibrator, or use a Windows terminal, such as
Hyper Terminal, to enter single commands. Typical RS-232 remote configurations are shown
in Figure 23.
Figure 23. Calibrator-to-Computer Connection

7.1 Setting up the RS-232 Port for Remote Control

Note: The RS-232 connection cable should not exceed 15m unless the load capacitance
measured at connection points is less than 2500pF.
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