ENMET PID-Guard - Manual (Page 13)

PID-G UARD ENMET Corporation
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5.2 PID-G UARD Maintenance Adjustments
Pushbutton switches control the M ENU and S ELECT functions. The M ENU and S ELECT button locations are indicated on the
display panel, see Figure 3. The M ENU button is used to display the various menu options and make incremental changes to
numbers such as alarm points, calibrations gas, etc. The S ELECT button is used to select that option, set zero or span digit.
To enter the maintenance menu press and hold the M ENU button for 2 to 4 seconds
Table 3 indicates the maintenance menu sequence see Figure 7 for a detailed maintenance menu flow chart.
5.2.1 Advance/Exit Maintenance Menu
To advance to the next sequence in the maintenance menu cycle, when Exit appears on the display, press the M ENU button.
Exit maintenance, by pressing the Exit appears on the display. Press the S ELECT button to return to the instrument Normal Gas
Display.
Example of Exit menu:
5.2.2 Zero Adjust
The ZERO function must be performed by exposing the PID-G UARD instrument to clean fresh air. If the air at the sensor is in
question, use a cylinder of 20.9% oxygen to provide a clean air reference.
Enter the maintenance menu by pressing and holding M ENU button for 2 to 4 seconds. See Figure 7, PID-G UARD Maintenance
Menu flow chart.
After entering the maintenance menu, Press the M ENU button until the Zero menu is displayed.
Press the S ELECT button to perform a Zero.
The display will alternate between Zero and PV: To abort Zero function press and hold M ENU button for 3 – 4 seconds,
Abort? will appear, press S ELECT button to return to Zero.
Press the S ELECT button to initiate a Zero adjustment.
An auto detect sequence is initiated. After 15 seconds, the PID-G UARD will monitor the zero reading for stability.
If the reading stabilizes, within the pre-programmed perimeters, an automatic zero adjustment will be made.
Cal OK appears on the display and in 1 – 2 seconds, display will change to Span.
If you wish to Span the sensor press the
S ELECT button you are now ready to apply gas. Proceed to gas span step 2
If you wish to Exit the maintenance menu, press M ENU button until Exit is displayed, then press S ELECT button to return to
the instrument Normal Gas Display
If the reading does not stabilize, within 255 seconds, the procedure will be aborted. Sensor is outside of safe parameters to
be zeroed, the display will read Bad Zero. Repeat Section 5.2.2 Zero Adjust making sure to use a Zero gas of 20.9%
Oxygen.
ENMET part number 03296-209.
Example of Zero adjustment display:
Exit
S ELECT Press the S ELECT button to return to the Normal Gas Display.
M ENU
Press the M ENU button to advance through Maintenance Menus cycle
OR
Zero
Cal OK
If the Zero signal is not within Preset Specs the PID-G UARD
will display Bad Zero and return to Zero menu
S ELECT
M ENU
Bad ZERO
If the Zero signal is within Preset Specs the PID-G UARD will
display Cal OK momentarily then advance to Span menu
PV: 0
S ELECT
Press the S ELECT button to force Zero adjustment
Zero
Note: You can Press and H OLD the M ENU button to abort Zero
When Abort? appears press S ELECT button to
return to Zero menu
Abort?
S ELECT
M ENU