smartMODUL CONNECT Diffusion Sensor

Diffusion Gas Sensors For CO2 (Carbon Dioxide) And Ambient Air Monitoring. 

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  • Features
  • Specifications
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The smartGAS smartMODUL CONNECT series is based on the BASIC series, but possesses additional interface electronics (smartCONNECT 2 "sC2") as well as a range of interesting options that further simplify its use for CO2 Carbon Dioxide measurement and ambient air monitoring.

In addition to an RS485 interface and data communication by Modbus ASCII and RTU, the sensor signals can also be read out in analogue form with (0)4–20 mA or 2/5/10 V voltage output (simple to set using jumpers). The concept of the smartMODULCONNECT diffusion sensors is further rounded off by the wide input voltage, LED visual state indication and on-board pressure compensation.

As well as CO2 measurement, the smartMODUL CONNECT sensors can also be utilised for the detection of many other gases such as e.g. various hydrocarbons, SF6 or refrigerants.

The smartMODUL CONNECT sensors have the ability to measure the following gases:

Gases Measurement Range Model Type
C2HAcetylene 0-2.3 Vol.-% (0-100% LEL) C1-010236-00000
C4H10 n-Butane 0-1.4 Vol. -% (0-100% LEL) C1-020146-00000
CO2 Carbon Dioxide 0-5000 ppm
0-5 Vol. -%
0-20 Vol. -%
(0-100% TLV) C1-212505-00000
CO Carbon Monoxide 0-2 Vol. -%   C1-222206-00000
C2H4 Ethylene 0-2.4 Vol. -% (0-100% LEL) C1-030246-00000
CH4 Methane 0-4.4 Vol. -% (0-100% LEL) C1-040446-00000
C3H8 Propane 0-1.7 Vol. -% (0-100% LEL) C1-050176-00000

For more information about integrated systems, contact Air-Met Scientific today. 

  • Infrared measuring principle (NDIR)
  • Dual beam technology
  • Analogue interfaces (e.g. 4-20mA)
  • Modbus AASCII via RS485
  • Input voltage 12 - 28 Volt DC
  • Zero and span calibration by jumper
  • Gas entry by diffusion
  • High selectivity
  • Pre calibrated

For full product specifications, please refer to the product brochure.

General Features
Measurement Principle: Non Dispersive Infra-Red (NDIR), dual wavelength
Measurement Range: Dependent on model - see brochure
Gas Supply: By diffusion (atmospheric pressure)
Dimensions:  72mm x 55mm x 34mm (Lx W x H)
Warm Up Time:  < 2 minutes (start up time)
< 30 minutes (full specification)
Measuring Response1
Response time (t90) Approx 30 seconds 
Digital Resolution (@ zero): 1 ppm / 0.1% LEL / 0.01 Vol. -% 2
Detection Limit: ≤ 1% Full Scale (typically)
Repeatability:  ≤ +/- 1% Full Scale
Linearity Error3 ≤ +/- 2% Full Scale
Long Term Stability (zero)4 ≤ +/- 2% Full Scale Over 12 Month Period
Long Term Stability (span)4 ≤ +/- 2% Full Scale Over 12 Month Period
Electrical Inputs & Outputs
Supply Voltage: 12 to 28 V DC +/- 5%
Supply Current: 70 mA Average, max. 140mA
Power Consumption: < 1 Watt
Analogue Output Signal: 0-20mA linear | 4-20mA linear | 0-1V linear (wth 50Ω) | 0-2V linear (with 100Ω)
Maximum Load:  125Ω
Digital Output Signal: Modbus ASCII via RS485
Calibration:  zero and span by jumper or SW

Relating to sample gas pressure 1013 hPa absolute, 0.5l/min gas flow and 25 degrees celcius ambient and gas temperature

Dependent on the gas and measurement range

Stated linearity error excludes calibration gas tolerance of +/- 2%

4 For dry and clean test gas at 25 degrees celcius and 1013 hPa absolute - depending on the operating and ambient conditions, values may differ. 

  • CO2 measurement / monitoring
  • Hydrocarbon detection
  • SF6 or refrigerant monitoring