Rapidox 1100 Methane Analyser

Product Information

The Rapidox 1100-M methane (CH4) gas analyser is the company’s most cost-effective and versatile range of CH4 gas analysers fitted with an infra-red gas sensor or a tuneable laser diode sensor depending on the application.

The infra-red (IR) sensor is the most common and preferred solution for methane (natural gas) measurement providing fast and accurate gas analysis over the range 0-1% to 0-100% CH4 and is particularly suitable for aggressive industrial applications as the sample gas is filtered for dust and particles and is non-condensing. IR sensors are highly suitable for measuring gases that absorb infra-red light such as CO2, CO & CH4 particularly in percent levels of concentration.  Different sensor lengths are available to allow different ranges of the gas to be detected hence the importance of selecting the correct range for your application.

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Product Information

Please note that methane IR sensors are sensitive to the presence of all hydrocarbons including ethane, butane, pentane & propane and will give reading based on the total hydrocarbon content rather than the natural gas content.  For applications such as Syngas measurement where there are other hydrocarbons present a tuneable laser diode sensor (TLD) is a more suitable sensor choice.  This sensor responds only to methane (natural gas) and is available in 0-100% scale CH4.

All Rapidox gas analysers used in flammable gas applications are fitted with a flashback arrestor as standard.

The standard R1100-M methane analyser is available in various ranges of CH4 selected at the time of ordering.  0-1%, 0-5%, 0-10%, 0-30% & 0-100% are available in the IR sensor range, and 0-100% for the TLD option,  with a choice of gas fittings on the front or rear of the instrument.  Upgrades to Swagelok fittings (1/4” or 6mm) are available at the time of order.  Each version is available with a choice of internal electric sample pump or vacuum ejector pump.

Special variations of the R1100-M model include:

A stainless steel IP54 instrument version with 316 stainless steel instrument case and sealed gasket joints, designed primarily for the food and pharma industries.

2)         A 4U bezel mounted version compatible with 19” rack mount systems.

3)         A special biogas version (0-100%) with a modified calibration for use in biogas (CH4/CO2) gas mixtures.

Finally, the Rapidox 1100 complies with EMC Directive 2004 / 108 / EC. UL/ETL Certification Number: UL-61010-1.


  • Wide choice of IR sensor ranges available meaning more flexibility for the user
  • Alternative TLD sensor option for Syngas applications to prevent cross interference with other hydro-carbons
  • Safety comes first – all methane analysers are fitted with a flashback arrestor on the gas inlet
  • Thanks to internal pressure & temperature correction technology, you can be assured of fast and accurate results every time
  • Simple span-gas calibration procedure (with appropriate calibration gas) for after-sale longevity
  • Low maintenance and long-life sensor expectancy – standards expected from a high quality analyser
  • Two fully programmable alarms with open or closed relay for a complete monitoring solution
  • Fully programmable digital and analogue outputs to further enhance the Rapidox 1100’s versatility
  • Software package includes full control of the analyser, live graphing & Excel compatible data-logging
  • Operates on any worldwide mains voltage (90-260VAC) resulting in ease of use wherever you go
  • Options of front or rear gas fittings and bezel mounts (specify on order)
  • The choice between a long-life variable speed pump or vacuum ejector option
  • For more peace of mind, a password protection feature comes as standard
  • Complies with EMC Directive 2004 / 108 / EC. UL/ETL Certification Number: UL-61010-1

Product Specification

Type Measurement
CH4 Sensor Range0-1%, 0-5%, 0-10%, 0-30% or 0-100%
CH4 Sensor Accuracy± 2% full scale accuracy
CH4 Sensor ResponseApproximately 20 sec for a 90% response
CH4 Sensor Life Expectancy>5 years
Sample Connections4mm ID / 6mm OD nipple type Rectus or Swagelock Front or rear positioning
CalibrationRequires 2 user selectable gas compositions Normally zero and span
Warm-up Time5 minutes
Voltage Outputs0-10V, user programmable
Current Outputs4-20mA linear, user programmable
Digital OutputsRS232 (RS485 option available): data streamed on demand/Modbus RTU/Ethernet
Max Gas Pressure500-1500 mbar absolute
Max Gas Sample Temperature50°C
Operating Temperature5°C to 35°C
Pump OptionLong life diaphragm pump variable speed 0-1.2 litres per min
Ejector OptionVacuum ejector fitted, running off inlet pressure
Display20 x 4 character OLED display
Supply Voltage90-260VAC, 50/60Hz
Analyser DimensionsBench: 150mm(H) x 247mm(W) x 250mm(D) Panel: 300 x 4U (177mm(H) x 300mm(W)) Multiplex: 150mm(H) x 263mm(W) x 250mm(D)
Weight3.5kg (4kg with bezel)

Customer Testimonials

“We have always been impressed with both the quality of the products and the professionalism shown from the staff at Cambridge Sensotec. We have used their gas analysis technology in our welding gloveboxes for many years to give our products the cutting edge. We would highly recommend Cambridge Sensotec not only for their product quality, but also their after sales service.”

Ricky Hart, Weldlogic Europe Ltd.