Rapidox 2100 Portable Oxygen Gas analyser

Calibration

The Rapidox 2100 calibration procedure is straightforward and extremely flexible. For maximum performance the Rapidox 2100 should be calibrated periodically, and ideally the measuring range should be within the two calibration points. The user can select the two required oxygen calibration gases (air is normally one) and program the values using the software supplied. The Rapidox 2100 has battery back- up memory that stores the configuration until a new calibration is required. The calibration mode is accessed using the keypad on the front panel and takes only a few minutes to complete. To calibrate the Rapidox 2100, the sensor is exposed to the first calibration gas for a few moments and when the reading is stable, the user industrial presses the calibration button. The procedure is repeated with the second gas and the analyser is then fully calibrated. If a calibration goes wrong the user can simply return to the factory settings using the software supplied. The calibration data can also be stored on the PC for reloading. This is useful if you have several users or several different sensors. Gas temperature must not exceed 600 Operating temperature: Simple and fully flexible calibration procedure requires two calibration gases (ambient air is normally used as calibration gas no. 1). Gas compositions are user-selectable and programmed into the Rapidox via the front panel keypad. Factory pre-sets can be re- loaded to allow the unit to be 'rescued' from a failed calibration. Rapidox is calibrated using the keypad on the front panel. Display changes into calibrate mode to inform user of progress. Sensor Head: Calibration: Zirconia 'Nernstian' cell housed in a metal case with 18mm 0.5mm pitch thread for tapping into pipes and flues. Operates at pressures of 10-4 Torr to positive pressure of 200 bar. Sensor is heated to approximately 650oC using a platinum resistance heater. Temperature is measured and controlled by the Rapidox unit and gives enhanced sta- bility to the calibration. Sensor body external length is 66mm. Projection into the gas stream is 28.2mm. Cable length is 2m. Sensor life expectancy is typically 35,000 hours in clean gases. The display on the front of the instrument is a large back-lit LCD with 2 X 16 charac- ters 9mm high. The display can be read quite easily from a distance of several meters. Display update rate is user-programmable. Displays four significant figures of oxygen (O2). The display notation (percent, ppm, exponential or 'automatic') is user selecta- ble. Values of oxygen below 10e-1ppm are always displayed using exponential nota- tion. Working range is 10e-17ppm (=10e-21%) to 100%. Temperature display: type 'K' thermocouple 0 to 999 degrees Celsius. The display can also be set to read in pres- sure (Torr or MPa).

Technical Description

Rapidox 2100 Unit: Sensor response time is typically 4 seconds for a 90% response involving a step change in composition. A change between 21% and 100% can be recorded in less than 4 seconds depending on flow-rates. High accuracy is maintained between calibration points. Accuracy better than ± 1% of the actual measured oxygen content with a pre- cision better than ± 0.5%. Outside calibration range accuracy is typically ± 2.5%. Display: The Rapidox 2100 is an attractive metal instrument with plastic membrane front and rear panels. The menu system is accessed via a 5-button keypad on the front. The unit weighs approximately 5kg and is fitted with adjustable rubber feet and strong carry handle. The unit is mains powered (110/240V 50/60Hz) and is supplied with mains cable. Case dimensions W=205mm; D=260mm; H=150mm. Response, Accuracy and Precision:
o C and should ideally be kept below 350
o C for optimum performance. Sensor cables must not exceed 300
o C. Rapidox unit normal operating temperature is 5-35 RS232 outputs on demand values for oxygen (ppm), temperature (Celsius), time (hh:mm:ss) and date (dd:mm:yy in the UK, mm:dd:yy in the USA) once per second. Outputs can be data-logged using the software provided. Standard analogue outputs are 0-5V and 4-20mA and alarm (high and low condition) circuits. These outputs are fully user-programmable via keypad on the front panel.
o C. Outputs:

Cambridge Sensotec Limited 31 Elizabeth Court St Ives CAMBS PE27 5BQ England Tel: +44 (0)1480 385812 Fax: +44 (0)1480 352529 Mob: +44 (0)7866 624236 Sales@cambridge-sensotec.co.uk Www.cambridge-sensotec.co.uk