User Manual

17 95-8440 9.3
4. Wait for the zero calibration point to stabilize (typically
1 minute).
After successful zero calibration:
– The LED will begin flashing (if used)
– The current will drop to 2.0 mA.
Proceed to step 5.
If zero calibration fails:
– The LED will turn off
– The current output will drop to 1.6 mA.
Reset the detector by cycling power to the detector
or by holding the Cal Magnet near the Cal Switch
in the PIRTB (if used) for one second. Begin
calibration again at step 1.
5. Connect the calibration gas canister, valve and
tubing to the direct input nozzle as shown in either
Figure 24 (aluminum model) or Figure 25 (stainless
steel model) depending on the method used.
6. Apply
50% LFL calibration gas to the detector.
This is accomplished by opening the valve on the
calibration gas canister (see Figure 24 or Figure 25).
A 2.5 liter per minute flow rate is recommended.
– The LED will continue flashing (if used)
– The current will remain at 2.0 mA as the gas
concentration increases.
7. The detector will automatically accept the span
calibration when the detected gas level is stable
(typically
1 to 2 minutes).
After successful span calibration:
– The LED will turn off (if used)
– The current will drop to
1.8 mA.
Proceed to step 8.
If for any reason a successful calibration is not
accomplished within 10 minutes, a calibration fault
will occur:
– The LED will turn off
– The current output will drop to 1.6 mA.
Turn off the gas, then reset the detector by cycling
power to the detector or by holding the Cal Magnet
near the Cal Switch (if used). Begin calibration
again at step 1.
Figure 24—Aluminum PIR9400 Detector
Calibration Conguration
TERMINATION BOX
FLEXIBLE TUBING
CAL MAGNET
POINTWATCH DETECTOR
B1745
CALIBRATION NOZZLE
VALVE
CALIBRATION GAS CYLINDER
Figure 25—Stainless Steel PIR9400 Detector
Calibration Conguration
TERMINATION BOX
FLEXIBLE TUBING
POINTWATCH DETECTOR
C1746
CALIBRATION NOZZLE
VALVE
CALIBRATION GAS CYLINDER