Det-Tronics PIR9400 PointWatch Infrared Hydrocarbon Gas Detector - Manual (Page 4)

2 95-8440 9.3
SPECIFICATIONS
PointWatch Gas Detector (PIR 9400 )
INPUT VOLTAGE—
24 Vdc nominal. Operating range is 18 to 30 Vdc.
POWER CONSUMPTION (Watts)—
Input Voltage:
18 Vdc 24 Vdc 30 Vdc
Nominal 3.5 4.6 6.2
Maximum 4.0 5.5 7.0
DETECTION RANGE—
0 to 100% LFL.
GASES —
The Model PIR
9400 Detector is approved to Methane, but
most flammable hydrocarbon vapors (ethane, ethylene,
propane, butane, and propylene) are also detectable.
Methane gas detection is the factory default gas type
setting. Reference the “IR Module Removal and Gas
Selection” section of this manual for alternate gas type
settings.
CURRENT OUTPUT (NON-ISOLATED)—
Linear
0–20 mA current source.
• 4–20 mA output indicates 0 to 100% LFL detection
range (for linearized gases)
• 23.2 mA indicates over-range condition
• 0–2.4 mA levels indicate calibration, fault and
fouled optics conditions.
Refer to Table 1 for a detailed description of current
outputs.
Maximum loop resistance: 580 ohms at 24 Vdc.
See Figure 1 for further information.
NOTE
The following specifications for Accuracy, Stability
and Repeatability are based on
0 to 100% LFL
methane.
ACCURACY (Room Temperature)—
±3% LFL from 0 to 50% LFL, ±5% LFL from 51% to
100% LFL.
RESPONSE TIME (Seconds)—
N·m T 90
Multilayered aluminum weather baffle
With hydrophobic filter 7 14.4
Without hydrophobic filter 5 10
Polyphthalamide (PPA) weather baffle
With hydrophobic filter 6 16
Without hydrophobic filter 2 3
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).
C1964
18 20 22 24
POWER SUPPLY VOLTAGE (VDC)
26 28 30 32
MAXIMUM LOOP RESISTANCE (OHMS)
400
500
600
700
800
900
LOOP RESISTANCE (OHMS)
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
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