Det-Tronics PW9200x Pathwatch IR Gas Detection System - Manual (Page 11)

INITIAL SETUP
When the inspection procedures and special precau-
tions detailed above have been carefully observed,
the initial setup of the PW9200 is accomplished by fol-
lowing Steps 1 through 9 below:
NOTE
Signal ground of the electronics is not tied to the
housing case and therefore, is not tied to earth
ground. Optimum immunity to 60 cycle noise
could require tying signal ground to earth ground
external to the instrument.
CAUTION
Do not remove protective window covers until
Step 7. Do not mount the instrument until power
is available. In order to minimize the possibility
of condensation forming inside the instrument,
once mounted, the instrument should not be left
without power for extended periods of time.
1. Attach the pan-tilt mounts to a user supplied 4.5
inch O.D. mounting pipe with the two U-bolts sup-
plied. Tighten the U-bolts securely at the desired
height.
2. Attach the transmitter and the receiver to the pan-
tilt mounting plates using the 3/8-16 x 1-1/2 inch
stainless steel bolts, nuts and washers provided
with the instrument, as shown in Figure 5. Be sure
to attach the receiver to the mount marked “R” and
to attach the transmitter to the mount marked “T”,
and to match the serial number of the instrument
with the serial number of the mount. The mounting
surface should be vertical with the transmitter and
receiver roughly facing each other.
3. Connect external wiring as shown in Figure 6. Strip
the insulation back 1/4 inch. Insert the stripped
wire into the terminal under the appropriate num-
ber. Tighten the screw above the number by turn-
ing it clockwise using a screwdriver with a 1/8 inch
blade. All terminals in the junction box are num-
bered. Low voltage signal lines and high voltage
power lines from the junction box should be in sep-
arate cables, if possible. If the signal and power
lines are not in separate cables, the high voltage
power wires (115 vac line and power ground) must
be shielded from the signal lines for safety rea-
sons. Any conduit installed must be of a flexible,
explosion-proof type, which will allow panning and
tilting of the housings for optimum alignment.
RATIO, NUMERATOR AND SIGNAL GROUND
wiring from the junction box should be connected
to external readout devices of at least 5,000 ohms
impedence. If 4 to 20 ma output is installed,
external readout devices must have less than 500
ohms impedence.
9 95-8400
Figure 6—System Interwiring Diagram