High Resolution Infrared Methane (CH4) Sensor - Prime1

  • High Resolution Infrared Methane (CH4) Sensor
  • High Resolution Infrared Methane (CH4) Sensor
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• Sensing ranges:
0-100% LEL Methane,
0-100% LEL Hydrocarbons,
0-100% Volume Methane
• Default range: High resolution 0-100%volume methane
• Operating voltage range 3.0V - 5.0V
• Operating current 80mA typical
• Power consumption: 280mW typical
• Relative humidity:​ 0 - 95% RH non-condensing​
• Operating temperature range: -30°C to +60°C​

  • Model Number: Prime1
  • Data Sheet: Date Sheet File
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Product Specification

Prime1 Infrared Methane Sensor CH4 Sensor Description and Operation
The Prime1 sensor uses the non-dispersive infrared method to detect the presence of hydrocarbon gases. The sensor contains an infrared radiation source, a dual element custom infrared detector, a unique optical waveguide into which gas diffuses and internal ARM7 core microprocessor based electronics to provide a voltage output which is independent of the power supply polarity. The sensors can be configured to provide a pellistor format output, typically mid supply at zero with the voltage output increasing with respect to the detector pin by 100mV at range, or a linear voltage output, typically 0.4V - 2.0V over range with respect to the negative supply pin. In addition, the output can be read and the internal configuration can be accessed by a serial communications link.

The communication link contacts are pads in the 3 pin version Prime1 and pins in the 5 pin version Prime1. The internal electronics perform all the functions of driving the optical parts of the sensor, extracting the detector signals, converting the signals to a concentration, applying temperature compensation and scaling the output.When in a pellistor configuration, the Prime1 can replace catalytic sensors in existing circuitry subject to the power supply requirements. External components will be required to meet the power supply requirement when a Prime1 is used in constant current pellistor circuitry. The Prime1 is not currently Ex approved so should be housed in a suitable Ex enclosure when used in Hazardous areas.

Prime1 Infrared Methane Sensor CH4 Sensor Features
• High Resolution of 0.01%vol for 0 - 10% vol and 0.1% vol for 10 - 100% vol
• Operates independent of supply polarity
• Pellistor mimic Bridge or linear voltage output
• Operating voltage range 3.0V - 5.0V
• Operating current 80mA typical
• Latest technology MEMS detectors
• Sensing ranges: 0-100% LEL Methane, 0-100% LEL Hydrocarbons or 0-100% Volume Methane
• Default range: High resolution 0-100% volume methane
• All metal construction with isolated housing
• Small internal volume
• Flexible electronic configuration access
• User calibration also enabled by hardware connections
• Wide operating temperature range
• Fast response
• Immunity from 'poisoning'

Prime1 Infrared Methane Sensor CH4 Sensor Specification
Unless otherwise stated all data was taken using: Supply voltage of 3.5V. Ambient temperature (between 20°C and 25°C). Ambient pressure (between 995 hPa and 1020 hPa). Gases diluted in nitrogen. Gas Flowrate 1litre/min across sensor face.

Supply voltage range:
3.0V - 5.0V
Power consumption:
280mW typical
Default output range:
  Pellistor mode: 
  Voltage mode: 

0 - 100mV from mid supply relative to detector pin
0.4V - 2.0V 
Warm up time:
  To operation
  To specification

< 60s
< 3 minutes 
Nominal ranges: 

0 - 100% LEL methane, 0 - 100% LEL hydrocarbons or
0 - 100% Volume methane 
Response time (T90)
< 30s to a step change in gas concentration
Minimum resolution:
  At zero 

  At range

0.01% of range (digital), 0.04% of range (0.4 - 2.0V analogue voltage) or
0.1% of range (analogue pellistor mimic)
0.1% of range
Zero repeatability:
± 0.1% of range

< ± 3% of range up to 50% of range
< ± 5% of range above 50% of range
> 5 years
Digital interface format:
8 data bits, 1 stop bit, no parity
Digital Interface Baud Rate
38400 (default), 19200, 9600
Digital Interface Logic Levels: 

VINL Input low voltage: <0.8V
VINH Input high voltage: >2.0V
VOL Output low voltage: <0.4V
VOH Output high voltage: >2.4V
18.0 grams
Complies with EN61779-1
Relative humidity:
0 - 95% RH non-condensing
Operating temperature range:
-30°C to +60°C
Storage temperature range:
-40°C to +80°C
Operating pressure range:0
700 - 1300 hPa

Prime IR Sensor Type
Sensing Ranges
0-100% Lel Methane, 0-100% Lel Hydrocarbons, 0-100% Volume Methane
0-2000ppm Carbon Dioxide to 0-10% Volume Carbon Dioxide
10-100% Volume Carbon Dioxide
0-100% Lel Acetylene
True Pellistor replacement, 0-100% Lel, 3 Pins

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