Det-Tronics PW9200x Pathwatch IR Gas Detection System - Manual (Page 4)

SPECIFICATIONS
HOUSING SIZE—
Transmitter and receiver dimensions are identical:
12-1/4 inches (W) x 11-1/2 inches (H) x 9-1/2 inches
(D).
WEIGHT—
Transmitter: 38 lb (17.2 kg).
Receiver: 42 lb (19 kg).
MOUNTING—
3/8-16 bolts (4 per housing) to a pan-tilt mount. The
mount interfaces between the instrument housings
and the user supplied vertical mounting pipes (4.5
inch O.D.).
OPERATING VOLTAGE—
Standard: 105 to 125 VAC, 50/60 Hz.
The incoming power line is fused internally to protect
the instrument from damage. These fuses are acces-
sible on the front panel. On the 4 to 20 ma Output
Board, the 4 to 20 ma module is also fused.
POWER CONSUMPTION—
Transmitter: 30 watts.
Receiver: 60 watts.
OPERATING TEMPERATURE—
In ambient air with instrument shaded from direct sun-
light: –4°F to +110°F (–20°C to +43°C) at 60 Hz,
–4°F to +100°F (–20°C to +38°C) at 50 Hz.
OPERATING DISTANCE (transmitter to receiver)—
Maximum: 328 feet (100 meters).
Minimum: 66 feet (20 meters).
VOLUME MONITORED—
A cylinder with a diameter of approximately 8 cm and
a length determined by the separation distance of the
transmitter and receiver.
SENSITIVITY (using heavy HC filters)—
100 ppm-meters minimum for heavy hydrocarbons.
WARNING
If the instrument is furnished with heavy hydro-
carbon filters, it will not respond to ethylene or
methane. Contact the factory for information on
sensitivity to these vapors.
RESPONSE TIME—
63% of final reading within 10 to 20 seconds after a
step change in hydrocarbon vapor concentration.
HYDROCARBON VAPOR ALARM OUTPUT—
SPST relay, rated at 7 amperes continuous, 120
vac/240 vac or 28 vdc. Also rated at 1/3 HP at 120
vac, 1/2 HP at 240 vac. Contacts are closed under
normal clean air conditions and open when vapors
are detected.
OBSTRUCTION/FAULT STATUS OUTPUT—
SPST relay, rated at 7 amperes continuous, 120
vac/240 vac or 28 vdc. Also rated at 1/3 HP AT 120
vac, 1/2 HP AT 240 vac. Contacts are closed under
normal conditions and open when the beam is inter-
rupted or a malfunction occurs.
ANALOG OUTPUT—
A 0 to 10 vdc analog output is available from the
instrument with 0 vdc corresponding to clean air. The
analog output increases as the hydrocarbon vapor
increases with +10 vdc corresponding to full scale
hydrocarbon vapor concentration along the monitored
path. The concentration corresponding to full scale is
adjustable over a ±50% range.
HAZARDOUS ENVIRONMENT CERTIFICATION—
Canadian Standards Association certified for opera-
tion in Class I, Division 1, Groups C and D environ-
ments and CSA enclosures Type 3 and 4.
FUNCTIONAL DESCRIPTION
A functional description of the operation of the
PW9200 is detailed in the following paragraphs and is
illustrated in Figure 1.
TRANSMITTER
The transmitter projects a beam of light toward the
receiver along the path to be monitored. A tungsten
halogen lamp is mounted at the focal point of a
parabolic reflector in the transmitter housing.
RECEIVER
The receiver contains the optical, mechanical, and
electrical components for receiving the light emitted
by the transmitter and processing the signal to an out-
put that is proportional to the average hydrocarbon
content present in the volume monitored.
Receiver Lens
Light enters the receiver through the infrared transmit-
ting lens. The lens focuses the incoming light onto
the face of the infrared photodetector.
2