Rapidox 1100 Oxygen Analyser

Product Information

The Rapidox 1100 oxygen sampling gas analyser is the company’s most cost-effective and versatile oxygen gas analyser fitted with either a zirconia, electrochemical or optical type O2 gas sensor.

The three types of sensor technology offer an oxygen measuring solution for almost any application possible. The zirconia oxygen sensor is the most common and preferred solution providing fast and accurate gas analysis over the range 0.5ppm to 30% O2 in inert gas, and is particularly suitable for aggressive industrial applications where temperatures are high.

This is the main choice of sensor for ppm O2 measurements, giving years of reliable accurate measurements. For applications where zirconia can’t be used easily (e.g. flammable gases, hydrogen or gases with high levels of VOCs), users have a choice of two electrochemical oxygen sensors: one for low ppm measurements of 0.1ppm up to 1% and another for high percent measurements in the 0.1% to 100% oxygen range. Electrochemical sensors are ideal for measuring high percent levels of oxygen or ppm levels where VOC’s, flammable gases, CO, H2 or He are present in the gas sample.  A special “oxygen clean” version of the high range analyser is also available for applications where oxygen is >30%.

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Product Information

An alternative to electrochemical sensors is an optical sensor which is suitable for oxygen measurements in the 0.01% to 100% range.  Optical sensors are more expensive than electrochemical sensors but have exceptionally low drift and last up to ten years making their cost of ownership more economical in the long run.  This oxygen analyser is the preferred choice where regular recalibration is difficult due to the installation / application.

For applications requiring the full measurement range from 0.1ppm to 100% O2 in a gas not compatible with a zirconia sensor, a dual-sensor Rapidox 1100 is available; comprising both an optical sensor for high readings and an electrochemical sensor for ppm O2 readings.   The gas flowing over the sensors is controlled automatically using solenoid valves, allowing a seamless transition of measurement from low ppm to high percent in a single analyser.

Special variations of the R1100 model include:

1)            A three-channel multiplex version (ZR3), which allows for three gas streams to be sampled from separate locations. Gases can be analysed in sequence or at intervals set from the controls (front keypad or software).  This model is particularly suitable for large solder re-flow ovens where multiple sample points are needed across the length of the oven chamber.

2)            A closed loop version (PFC) which supplies a 4-20mA PID control signal to a proportional flow control valve, allowing precise control of the oxygen levels in an oven or chamber based on the Rapidox gas reading.

3)            A single solenoid relay version (RSO) using a remote 24V voltage output.  This is a more basic and cost-effective way of controlling the oxygen levels by opening and closing a nitrogen feed using an electric solenoid based on the Rapidox gas reading.

4)            A dual-sensor version (OPT-L) comprising a pair of O2 sensors in a single analyser, one for low ppm readings and one for high percent readings, controlled by solenoid valves for a seamless & continuous measurement through the full range of 0.1ppm to 100% O2

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

Please contact Cambridge Sensotec for further information on this bespoke option.


  • Choice of Zirconia, Electrochemical or Optical O2 sensor technology meaning more flexibility for the user
  • Background gas calibration in both nitrogen and argon available for Zirconia sensors
  • Thanks to internal pressure correction technology, you can be assured of fast and accurate results every time
  • Simple 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
O2 sensor range0.5ppm to 300,000ppm (30%) Zironcia Sensor 0.1ppm to 10,000ppm (1%) L cell 0.1% to 100% E-cell 0.01% to 100% OPT cell
Sample Connections4mm ID / 6mm OD nipple type Rectus or Swagelock Front or rear positioning
Warm-up Time3-5 minutes as standards
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 253mm(W) x 272mm(D) Panel: 300 x 4µ (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.