Det-Tronics PIR9400 PointWatch Infrared Hydrocarbon Gas Detector User Manual

Page 24

95-8440

9.3

NOTE

Check the new hydrophobic filter to ensure that
the overall length matches the length of the
existing filter, or the reflector tubes if no filter was
present. If the new filter appears longer than the
existing filter, trim off

0.23

inch (slightly less than

1/4

inch) of material from the new filter using a

scissors. Take care to not trim the filter too short,
as this will allow contaminants direct access to the
detector optics and cause nuisance optics faults.

7. If a hydrophobic filter is used, slide a new filter over

the two mounting tubes, being careful not to fold

or crumple it. The filter should be centered loosely

around the two mounting tubes.

8. Carefully slide the mirror/reflector tube assembly into

the hydrophobic filter and seat the reflector tubes

securely into the windows in the base. Again, be

careful not to crumple or fold the hydrophobic filter.

9. Tighten the two captive screws on the top of the

mirror assembly. See Figure

(aluminum) or Figure

(stainless steel). Tighten the screws evenly. Do

not over-tighten (apply

N·m minimum torque).

10. For aluminum models, slide the outer filter assembly

over the mirror assembly. The outer filter should be

oriented with the solid portion toward the base of the

unit. If it is not oriented correctly, the filter assembly

will not slide onto the unit. Slide the inner filter

assembly into the outer filter assembly and rotate

until it is seated securely, then fasten the two captive
screws. See Figure

11. For the stainless steel model, slide the stainless steel

collar onto the base assembly, then slide the baffle

onto the unit. Place the end cap on the baffle and

rotate it until it is seated securely, then fasten the two
captive screws (apply

N·m minimum torque). See

Figure

12. Calibrate the detector with

50%

LFL of the gas that

matches the calibration gas switch position following

the instructions in the “Calibration” section of this

manual.

TROUBLESHOOTING

Use Table

to isolate and correct malfunctions with the

PointWatch Detector.

REPLACEMENT PARTS

The detector is not designed to be repaired in the field.

If a problem should develop, refer to the Troubleshooting

section. If it is determined that the problem is caused by

an electronic defect, the device must be returned to the

factory for repair.

DEVICE REPAIR AND RETURN

Prior to returning devices, contact the nearest local

Detector Electronics office so that the Return Material

Identification (RMI) number can be assigned. a

written statement describing the malfunction must
accompany the returned device or component to
assist and expedite finding the root cause of the
failure.

Pack the unit properly. Always use sufficient packaging

material. Where applicable, use an antistatic bag as

protection from electrostatic discharge.

NOTE

Det-Tronics reserves the right to apply a service
charge for repairing returned product damaged as
a result of improper packaging.

Return all equipment transportation prepaid to the factory

in Minneapolis.

NOTE

It is highly recommended that a complete spare
be kept on hand for field replacement to ensure
continuous protection.