The following specifications for Accuracy, Stability
and Repeatability are based on a 0 to 100% LFL
methane calibration
ACCURACY (Room Temperature)—
±3% LFL from 0 to 50% LFL, ±5% LFL from 51% to
100% LFL.
RESPONSE TIME (Seconds)—
T50 T90
Aluminum
Outside weather baffle only 6 17
All weather protection installed 9 21
Stainless Steel
All weather protection installed 2 5
(Det-Tronics verified)
STABILITY—
Temperature
Zero: ±2% LFL from
–40°F to +167°F (–40°C to +75°C).
Span: ±5% LFL at 50% LFL from
–13°F to +167°F (–25°C to +75°C),
±10% LFL at 50% LFL from
–40°F to –13°F (–40°C to –25°C).
Time (10 months) ±2% LFL (Det-Tronics verified).
REPEATABILITY (Room Temperature)—
Zero: ±1% LFL.
Span: ±2% LFL at 50% LFL.
(Det-Tronics verified)
WIRING—
The PointWatch detector has five 22 AWG wires, 20
inches long for wiring into a junction box or the Infiniti
transmitter.
Red = + 24 volts dc
Black = – (common)
White = 4 to 20 milliampere signal output
Yellow = Calibration input
Green = Chassis ground
Power Wiring: 18 AWG minimum is recommended for
power wiring. Larger diameter wire may be required to
maintain a minimum of 18 vdc (including ripple) at the
sensor for all operating conditions (see Figure 2). For
maximum EMI/RFI protection, shielded cable is recom-
mended.
OPERATING TEMPERATURE RANGE—
–40°C to +75°C (–40°F to +167°F).
HUMIDITY (Non-Condensing)—
0 to 99% relative humidity (Det-Tronics verified)
5 to 95% relative humidity (FMRC/CSA verified).
RFI/EMI PROTECTION—
EN50081-1. Class B, EN50082-1 (IEC 801-2, 3, 4). (ETL
verified -EMC).
Operates properly with 5 watt walkie talkie keyed at 1
meter.
INGRESS PROTECTION—
IP66 (DEMKO certified per EN60529).
ENCLOSURE MATERIALS—
Aluminum (clear anodized) enclosure and weather pro-
tection baffles. Content: 0.8% to 1.2% Mg, 0.15% to
0.40% CU.
Stainless Steel (316 electropolished) enclosure, polyph-
thalamide (PPA) weather protection baffle.
2
Figure 1—4 to 20 ma Current Loop Resistance
Table 1—
Current Loop Output Levels and Corresponding Status Indications
Current Level Status
23.2 ma Over-range (120% LFL)
20.0 ma Full scale (100% LFL)
4.0 ma Zero gas level (0% LFL)
2.2 ma Zero calibration in progress
2.0 ma Span calibration in progress
1.8 ma Calibration complete - remove gas
1.6 ma Calibration fault
1.0 ma Fouled optics
0.8 ma 24 vdc line low (less than 17.5 vdc)
0.6 ma Calibrate input active at power-up
(probable wiring fault)
0.4 ma Active channel fault
0.2 ma Reference channel fault
0.0 ma CPU system fault, warmup
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