Det-Tronics PIR9400 PointWatch Infrared Hydrocarbon Gas Detector User Manual

Page 12

95-8440

9.3

NOTE

All baffle retainer screws are to be tightened to a
torque setting of

Newton-meters.

4. Calibrate the detector using a

50%

LFL mixture of

the gas type that was selected with the gas selection

switch. Refer to the “Calibration” section of this

manual for complete calibration details.

POINTWaTCh TERMINaTION BOxES (PIRTB)
Two termination box types for use specifically with the

PointWatch Detector are available from Det-Tronics.

• Tall Cover/Window Termination Box for one person,

non-intrusive calibration. This termination box

includes a magnetic reed calibration switch,

calibration LED and a windowed cover. Activating

the magnetic reed switch with the calibration magnet

and viewing the LED through the window provides

one person, non-intrusive calibration capability. See
Figure

• Short Cover Termination Box for Model PIR

9400

requires two people to accomplish calibration. This

termination box includes a magnetic reed calibration

switch, calibration LED and a solid cover. Activating

the magnetic reed calibration switch with the

calibration magnet or touching the calibration lead

to the negative lead (common) of the power supply

using an external switch are methods used to initiate

calibration. This termination box can also be used for
sensor separation. See Figure

The PointWatch Detector is designed to be threaded

into a termination box, which can be mounted to a
solid, vibration free wall or post. A

3/8

inch spacer may

be required between the enclosure and the mounting

surface to allow adequate room for the sensor and

calibration accessory.

Intrusive and Non-Intrusive Calibration
For hazardous locations, it is important to consider

the options for calibration of the PointWatch Detector.

The device can be installed so that calibration can

be performed by one person without opening the

explosion-proof enclosure (non-intrusive calibration).

This is accomplished by incorporating a display or

LED that provides information and/or instructions for

calibration. When a display is not used or the LED is not

visible from the outside, the enclosure must be opened

to observe the LED or to insert a meter to read the output

of the device (intrusive calibration). With this type of

installation, either a permit must be obtained to open the

enclosure or the procedure must be accomplished by

two people using walkie-talkies for communication.

Depending on the control devices selected, the

PointWatch Detector can be installed for either intrusive
or non-intrusive calibration. See Table

for a listing of the

installation options.

A user-supplied termination box can also be used,

provided it has the appropriate sized entries. This

termination box must be suitable for use in the application

and location in which it is being installed. A properly

installed normally open switch should be provided for

initiating calibration.

GENERaL WIRING REqUIREMENTS

NOTE

The wiring procedures in this manual are intended
to ensure proper functioning of the device under
normal conditions. However, because of the
many variations in wiring codes and regulations,
total compliance to these ordinances cannot be
guaranteed. Be certain that all wiring complies
with applicable regulations relating to the
installation of electrical equipment in a hazardous
area. If in doubt, consult the authority having
jurisdiction before wiring the system.

Table 2—Installation Options

for Intrusive and Non-Intrusive Calibration

Control Device

Non-Intrusive

1 person

Intrusive

2 person

FlexVu UD

Eagle Quantum Premier

8471

Infiniti U

9500 Transmitter

PIRTB w/ tall cover/window

PIRTB w/ short cover/no

window