Det-Tronics PIR9400 PointWatch Infrared Hydrocarbon Gas Detector User Manual

Page 19

95-8440

9.3

4. Wait for the zero calibration point to stabilize (typically

minute).

After successful zero calibration:

– The LED will begin flashing (if used)

– The current will drop to

2.0

mA.

Proceed to step

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

5. Connect the calibration gas canister, valve and

tubing to the direct input nozzle as shown in either
Figure

(aluminum model) or Figure

(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

or Figure

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

minutes).

After successful span calibration:

– The LED will turn off (if used)

– The current will drop to

1.8

mA.

Proceed to step

If for any reason a successful calibration is not

accomplished within

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

Figure 24—Aluminum PIR9400 Detector

Calibration Configuration

TERMINATION BOX

FLEXIBLE TUBING

CAL MAGNET

POINTWATCH DETECTOR

B1745

CALIBRATION NOZZLE

VALVE

CALIBRATION GAS CYLINDER

Figure 25—Stainless Steel PIR9400 Detector