The P-Chk Function; Overview; Keypad Functions; Screen Display - Bacharach PGM-IR Operation And Maintenance

Operation

2.14 The P-CHK Function

2.14.1 Overview

The P-CHK function (Pressure Check function) is useful to a service technician for troubleshooting a flow-fault
problem. The monitor will trigger a flow fault if the pressure drop from ambient is less than 0.2 psi during a purge
cycle, and 0.5 psi during a measurement cycle.

2.14.2 Keypad Functions

From the Data Display screen, enter the Function Menu screen. Next, use the Keypad buttons to move the arrow
(>) until it points to the P-CHK function, and then press ENTER to display the Pressure screen.
The Keypad Left button toggles the purge valve open and closed. Note that an asterisk (*) appears when the purge
valve is open causing the monitor to draw air from the purge-air bag.
The Keypad Down button toggles the pump ON and OFF.
Pressing the ENTER button stores the current manifold pressure shown on the left to the ambient pressure shown
on the right (must be done with the pump OFF).

2.14.3 Screen Display

Current Manifold Pressure →
Pressure Difference →
Current Manifold Pressure – Current manifold pressure in psia.
Stored Ambient Pressure – Stored ambient pressure in psia.
Pressure Difference – The difference between the current manifold pressure and the stored ambient pressure.
Fault Code – Current fault code (see page 14).
Purge Valve Asterisk (∗) – The purge valve can be opened and closed by pressing the Keypad Left button. An
asterisk appears on the display when the purge valve is open causing the monitor to draw air from the purge-air
bag.

2.15 Print/Plot Logged Gas Levels

A printout or plot of the last 200 ppm measurements can be made by connecting the optional Bacharach printer
and printer cable to the monitor as follows. (Refer to Replacement Parts on page 23 for printer and cable part
numbers).
1. For a printout or plot to be made, the monitor must have been set up to record gas measurements using
the LOG INT function.
2. Connect the RS-232 port on the monitor to the RS-232 port on the printer.
3. If not already done, refer to the printer manual and set the printer's communication parameters to:
•
Data bit = 8
•
Parity = None
• Baud rate = 19200
•
Handshaking = DTR
4. From the Data Display screen, enter the Function Menu screen. Next, use the Keypad buttons to move
the arrow (>) until it points to either PRINT to produce a printout, or PLOT to generate a plot.
5. Press ENTER to start the print/plot process.
16
CO
← Stored Ambient Pressure
← Fault Code
Instruction 3015-9000 Rev 2
Monitor
2