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4-20mA Analogue Transmitter Board Alphasense B Type Toxic & O2-A2 O2 Sensors - Analogue Transmitter

  • 4-20mA Analogue Transmitter Board Alphasense B Type Toxic & O2-A2 O2 Sensors
  • 4-20mA Analogue Transmitter Board Alphasense B Type Toxic & O2-A2 O2 Sensors
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• Factory calibration, custom-set for immediate use
• Wide operating voltage range
• Low RFI susceptibility
• Output​ Type:​ 4 mA to 20 mA 2-wire loop powered​
• Ambient temperature:​ -30 to 55℃
• Ambient humidity: 0 to 95% (non-condensing)​

  • Model Number: Analogue Transmitter
  • Data Sheet: Date Sheet File
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Product Specification

Alphasense 4-20mA analogue transmitters offer the following features:

   • Factory calibration, custom-set for immediate use
   • Wide operating voltage range

   • Low RFI susceptibility


Alphasense 4-20 mA analogue transmitter boards provide a cost effective way for Original Equipment Manufacturers to engineer transmitter heads for fixed installation systems. The range of sensors are shown below. Transmitters are supplied with pre-calibrated sensors.


The 4-20 mA output signal performance is as shown on individual sensor data sheets.


To allow OEMs to distinguish their product from other offerings, the sensor to gas aperture design is left to the OEM to execute.


Optional fitting kit and connector/leads are available on request.


Transmitter Board and Sensors

GAS
 SENSOR TYPE B
 MAX CONCENTRATION (ppm)
Carbon Monoxide
 CO-BF
 5,000
CO-B1
 5,000
CO-BX
 2,000
Hydrogen Sulfide
 H2S-B1
 200
H2S-BH
 50
H2S-BE
 2000
Sulfur Dioxide
 SO2-BF
 100
SO2-BE
 2,000
Nitrogen Dioxide
 NO2-B1
 20
Chlorine
 CL2-B1
 20
Hydrogen Cyanide
 HCN-B1
 100
Hydrogen Chloride
 HCL-B1
 20
Oxygen
 O2-A2
 15-25% O2 (standard)


4-20mA Analogue Transmitter Board INPUT
  Type:
 3-electrode gas sensor: O2 or B series toxic
  Range:
 See table (over)
  Power-off state:
 Shorting FET connects working to reference electrode
  Bias:
 Zero bias only
  Temperature compensation:
 None
4-20mA Analogue Transmitter Board OUTPUT
  Type:
 4 mA to 20 mA 2-wire loop powered
  Output range:
 3.8 to 42mA
  Supply voltage:
 +7.5 to 35VDC
  Accuracy:
 See sensor specification
  Resolution:
 ±0.25% Full Scale
  Sensor over-range:
 > 20mA
  Supply voltage stability:
 ±0.2% Vsupply
  Maximum loop resistance:
 825 @ 24VDC
  Protection:
 Reverse polarity diode
  Power and 4-20mA connection:
 2-Pin MOLEX plug (Ref. 22-27-2021)
4-20mA Analogue Transmitter Board ENVIRONMENT
  Ambient temperature:
 -30 to 55°C
  Ambient storage:
 -30 to 60°C
  Ambient humidity:
 0 to 95% (non-condensing)
  Coating:
 Conformal spray coated


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