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AirScan iR - Industrial
Sensor Description
Gas detection by the infrared method is based on
the principle that most gases absorb infrared energy
at a characteristic frequency. In this instrument, a
broad band infrared source emits energy which is
then bandpass filtered to produce a narrow range of
frequencies characteristic of the refrigerants' (CFC/
HCFC/HFC) absorption spectra. Any refrigerant in the
gas sample cell selectively absorbs energy reaching
the detector. This reduction in energy is detected,
amplified and sent to the signal processing portion of
the system.
The Manning AirScanTMiR Sensor line is a three-wire,
4/20 mA sensor for two bands of refrigerants available
in a range of 0—3,000 ppm, but can be adjusted for
lower ranges, if required. The low-band or R-404a
infrared sensor reacts to R-123, R-134a, R-404a and
R-507. The high-band or R-22 AirScanTMiR sensor
reacts to R-22.
Its solid, high-mass metal bench provides structural
and thermal stability, greater immunity to vibration,
as well as superior EMI/RFI shielding of the detector
and source. Internal compensation for environmental
changes allows the sensor to automatically adapt to
fluctuating temperature and humidity conditions. The
unit exhibits extremely high reliability with no moving
parts.
Every two seconds SensorCheckTM technology
monitors the AirScanTMiR source and ensures
that the dual channels are functioning properly. A
notification signal will be transmitted if any of several
performance parameters is not met.
Monitoring equipment must be configured to indicate
a fault if the signal is less than 1.5 mA. All signals over
20 mA must be considered a high gas concentration.
Manning infrared sensors are normally long-lived (5
years plus), unless physically damaged or wetted with
water or other liquid.
System Specifications
Electrical Power: 24 Volts DC regulated, 1.0 amp.
Output: Linear 4/20 mA output into a load resistor of
500 ohms maximum
Cable Length to Sensor: 1,000 feet maximum
Unit Enclosure: NEMA 4, gasketed, molded
fiberglass reinforced polyester. Non-painted, non-
rusting construction appropriate for food areas. UL
508 listed, CSA certified for use with industrial control
4
equipment.
Cable Recommendation: Three conductor, stranded,
shielded cable with drain wire, all enclosed in a
vinyl jacket. For cable runs up to 200 feet use, #18
AWG (Belden #8770 or equivalent). For cable runs
up to 1,000 feet, use #16 AWG (Belden #8618 or
equivalent). If sensor is SUPER HEAT equipped (—15°
F and below), contact Honeywell Analytics for cable
recommendations.
NOTE: The standard AirScanTMiR is for use in
nonclassified areas only.
Sensor Specifications
Type: CFC/HCFC/HFC selective infrared gas sensor/
transmitter AirScanTMiR
Method of Detection: Dual channel infrared energy
absorption (N.D.I.R. Non-dispersive Infrared)
Gases Monitored: Low-Band (R-404a, R-507,
R-134a, and R-123), High-Band (R-22) Range
Available: 0—3,000 ppm (can be rescaled to 0—1,000
ppm, or 0—500 ppm if required)
SensorCheck
Features: Dual channel functionality
TM
test, source strength evaluation, incoming voltage
monitor, IR source integrity check, operating
temperature monitor, "zero" down drift monitor, and
internal circuitry check.
Accuracy: ± 3% of full scale
Repeatability: ± 1% of full scale
Cross Sensitivity: Not affected by moisture, food
odors, floor cleaners, temperature changes, etc.
Operating Humidity: 0—100% RH (condensing).
ATMOS equipped® enviro-adaptive technology option
required for condensing conditions or refrigerated
areas.
Operating Temperatures: —50° F to +140° F.
ATMOS equipped® enviro-adaptive technology option
required for refrigerated areas or outdoors.
Storage Temperature: —20° F to +140° F
Gas Sampling: Diffusion method with no moving
parts
Sampling Frequency: Real time continuous
monitoring of all points
Response Time: T90 in 10 seconds with full-scale
target calibration gas @ .75 liters/min. flow rate
Weight: 4.4 lbs.
Dimensions: 9.59" high x 7.71" wide x 4.52" deep
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