Figure 3: Model Ir400; Figure 8. Ir400 Zero Switch / Led During Zeroing And Calibration - General Monitors IR400 Manual

Figure 8. IR400 Zero Switch / LED During Zeroing and Calibration

Review the general guidelines in Section 4.1 on Zeroing, Gas Check Tests, and Calibration. Make
sure the windows are clean and there is nothing blocking the optical beam.
4.2.2 Zero Only Calibration
The junction box used with the IR400 is fitted with a zero switch which eliminates any background
gas fluctuation.
Zero the Unit. Apply the General Monitors magnet that was included with the unit to the Zero
Switch / LED for approximately three seconds. The LED in the switch will light to show proper
placement.
2 Seconds
Zeroing
Zero Complete
Waiting for Gas
Gas Present
No Gas, Error
Fault
Re-Calibration
Complete
21
Model IR400
Step 1
Step 2
Step 3
Zero Switch