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

  • 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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• 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
Quantity:
- +

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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