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OEM 4-20mA Transmitter for NDIR Gas Sensor (Methane / Carbon Dioxide) - Cirius X

• Wide power supply voltage range
• Comprehensive RS232 communications
• Small size
• Supply Voltage Range: 8V DC - 36V DC
• 4-20mA output resolution: 6 µA
• Warm up time: < 30s to operation
• MTBF: > 5 years​
• Relative humidity: 0 - 95% RH non-condensing​

  • Model Number: Cirius X
  • Data Sheet: Date Sheet File
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  • OEM 4-20mA Transmitter for NDIR Gas Sensor (Methane / Carbon Dioxide)
  • OEM 4-20mA Transmitter for NDIR Gas Sensor (Methane / Carbon Dioxide)
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Product Specification

OEM 4-20mA Transmitter for NDIR Gas Sensors
(Methane/Carbon dioxide)

Cirius X OEM 4-20mA Transmitter for NDIR Gas Sensors Description and Operation
The Cirius X OEM 4-20mA transmitter is an extremely flexible transmitter for NDIR gas sensors providing a robust 12 bit linear 4-20mA selectable source/sink output in response to signals from standard NDIR gas sensors. All sensor driving, signal extraction and linearisation is performed on board with calibration and configuration accessed by a menu driven sequence using 3 pushbuttons or via the RS232 port. The 2-line LCD display shows the gas concentration and units under normal operation, fault diagnostics under fault conditions and interactive text under pushbutton operation for calibration. The pushbuttons are disabled if the display is removed, enabling tamper-proof running. Sensor connections to the Cirius X are made by 3-way and 4-way crimp EH connectors, segregating the sensor supply from the signal lines. Connections for the input power and 4-20mA signal are via screw terminals and an earth spade terminal is provided along with an earth bonding pad for ease of earth connections.

Cirius X OEM 4-20mA Transmitter for NDIR Gas Sensors Features
• Wide power supply voltage range
• Robust linear 12 bit link selectable 4-20mA source/sink output stage
• Fully configurable for a wide range of NDIR gas sensors
• Comprehensive RS232 communications
• Extensive fault monitoring
• Input power and output signal polarity protection
• Detachable 2 line LCD display with switchable backlight
• Menu driven pushbutton calibration
• Small size
• Designed for fixed head systems
• Optional plug in Hall Effect switch panel for "through the glass" calibration
• Wide operating temperature range
• Earth contact pad and earth spade terminal
• Designed in accordance with the SIL specification

Cirius X OEM 4-20mA Transmitter for NDIR Gas Sensors Outline Details
All dimensions in millimetres (±0.1mm unless noted)


Cirius X OEM 4-20mA transmitter Performance 
Unless otherwise stated all data was taken using: 
Supply voltage of 24V. Ambient temperature (between 20°C and 25°C). Ambient pressure (between 995 hPa and 1020 hPa). Cirius 1 hydrocarbon IR sensor connected and powered by the circuit.

Supply Voltage Range
 8V DC - 36V DC
Power consumption with display backlight
 <1.5W + (4-20mA output current * Supply Voltage)
Power consumption without display backlight
 <1.0W + (4-20mA output current * Supply Voltage)


4-20mA output resolution
 6 µA
4-20mA over-range limit output
 23.2 mA (120% full scale)
4-20mA under-range limit output
 2 mA (-12.5% full scale)
4-20mA fault output
 2 mA


Maximum 4-20mA loop resistance
 100Ω at 8VDC supply
in 4-20mA source mode
 270Ω at 12VDC supply
= (Vsupply - 5.7) / 0.0232
 780Ω at 24VDC supply


Minimum 4-20mA supply voltage in 4-20mA sink mode
 5.0V
Maximum 4-20mA supply voltage in 4-20mA sink mode
 30.0V


Field wiring connector single capacity
 0.14-2.5 mm2 solid, 0.14-1.5 mm2 stranded, 26-14 AWG
Field wiring connector double capacity
 0.14-1 mm2 solid, 0.14-0.75 mm2 stranded, 26-17 AWG


RS232 interface baud rate
 9600 baud


Warm up time
 < 30s to operation


Length
 68mm
Width
 78mm maximum on radii
Height above PCB surface (excluding display)
 14mm maximum
Height above PCB surface (including display)
 20mm maximum
Depth below PCB surface
 4.5mm maximum
PCB thickness
 1.6mm
Weight (excluding display)
 27g
Weight (including display)
 45g
Fixing holes (a)
 4 x M4 clearance on 48mm matrix
Fixing holes (b)
 4 x M3 clearance on 50mm matrix 


MTBF
 > 5 years


Relative humidity:
 0 - 95% RH non-condensing


Operating temperature range:
 -30°C to +70°C excluding display
-20°C to +50°C including display


Storage temperature range:
 -40°C to +80°C excluding display
-20°C to +50°C including display

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