Det-Tronics PIR9400 PointWatch Infrared Hydrocarbon Gas Detector User Manual
Page 12
10
95-8440
9.3
NOTE
All baffle retainer screws are to be tightened to a
torque setting of
5
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
6
.
• 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
7
.
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
2
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
or
2 person
FlexVu UD
10
X
Eagle Quantum Premier
X
R
8471
X
Infiniti U
9500 Transmitter
X
PIRTB w/ tall cover/window
X
PIRTB w/ short cover/no
window
X