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4-20 mA Digital Transmitter Board Alphasense Type A and B Toxic Gas Sensors - Digital Transmitter Board

• Factory calibration, custom-set for immediate use
• Digital zero, sensitivity and temperature compensation
• Digital and 4-20mA output
• Biased or unbiased operation
• Calibration and range change

  • Model Number: Digital Transmitter Board
  • Data Sheet: Date Sheet File
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  • 4-20 mA Digital Transmitter Board Alphasense Type A and B Toxic Gas Sensors
  • 4-20 mA Digital Transmitter Board Alphasense Type A and B Toxic Gas Sensors
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Product Specification

Alphasense 4-20mA digital transmitters offer the following features:
   • Factory calibration, custom-set for immediate use
   • Digital zero, sensitivity and temperature compensation
   • Digital and 4-20mA output
   • Biased or unbiased operation
   • Calibration and range change

Alphasense 4-20mA digital transmitter boards provide a cost effective way for Original Equipment Manufacturers to include 4-20mA gas sensor transmitters for fixed installation systems. The range of sensors are shown in Table 1. Transmitters are supplied with pre-calibrated sensors.

The 4-20 mA output signal performance is as shown on individual sensor data sheets. Calibration and digital interface communication use the 2-wire power supply (HART-type communications).

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

Table 1. Transmitter Board and Sensors

GAS
 SENSOR 
TYPE A
 MAXIMUM CONCENTRATION 
(ppm)
 SENSOR 
TYPE B
 MAXIMUM CONCENTRATION 
(ppm)
Carbon Monoxide
 CO-AF
 5,000
 CO-BF
 5,000
CO-AE
 10,000
 CO-B1
 5,000
CO-AX
 2,000
 CO-BX
 2,000
Hydrogen Sulfide
 H2S-A1
 100
 H2S-B1
 200
H2S-AH
 50 H2S-BH
 50
H2S-AE
 2,000
 H2S-BE
 2,000
Sulfur Dioxide
 SO2-AF
 50
 SO2-BF
 100
SO2-AE
 2,000

Nitrogen Dioxide
 NO2-A1
 20
 NO2-B1
 20
NO2-AE
 200

Chlorine
 CL2-A1
 20 CL2-B1
 20
Nitric Oxide*
 NO-A1
 250
 NO-B1
 250
NO-AE
 5,000

Phosphine
 PH3-A1
 10 PH3-B1
 10


PH3-BE
 2000
Ethylene Oxide*
 ETO-A1
 100 ETO-B1
 100
Hydrogen Cyanide
 HCN-A1
 100 HCN-B1
 100
Hydrogen Chloride
 HCL-A1
 20 HCL-B1
 20
Ammonia

NH3-B1
 100
* Biased sensors require at least 12 hours to stabilise after first powered on
   Specify required full scale gas concentration.  Do not exceed maximum gas concentration shown in table.

4-20 mA Digital Transmitter Board INPUT
Type:
 3-electrode gas sensor: type A or type B
Maximum range:
 -220uA to +320 uA
Minimum range:
 ± 3 uA
Sample rate:
 500ms per sample
Thermal drift:
 0.05 uA/℃
Power-off state:
  Shorting FET connects working to reference electrode
Resolution:
 11 nA
Bias:
 Selectable: Off, +200 and +300mV (±10 mV tolerance)
Temperature compensation:
 On-board temperature sensor. Range -30℃ to 60℃ ± 0.5℃ 
Software correction of Zero and Span
Connection:
 2-pin MOLEX plug (ref 22-27-2021)
4-20 mA Digital Transmitter Board OUTPUT
Type:
 4 mA to 20 mA 2-wire loop powered
Output current range:
 3.8 mA to 21.5mA
Supply voltage:
  10 to 30 VDC
Supply sensitivity:
 < 0.03% 10 to 30 VDC
Loop ripple effect:
 ± 2 uA measure @ 1 volt RMS 50Hz supply ripple
Thermal drift:
 ± 0.2 uA /℃
Accuracy:
  ± 5 uA
Maximum loop resistance:
 700 @ 24VDC
Resolution:
 0.75 uA
Sensor over-range:
 > 21.5mA
Protection:
 Reverse connection and over-voltage protection
Connection:
 2-Pin MOLEX plug (Ref. 22-27-2021)
4-20 mA Digital Transmitter Board ENVIRONMENT
Ambient temperature:
 -30℃ to 60℃
Ambient storage:
 -40℃ to 70℃
Ambient humidity:
 0% to 95% continuous (non-condensing)
Coating:
 Conformal spray coated
CE APPROVAL

BS EN 61326 (Industrial)


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