The Rapidox 3100D dual gas O₂ / H₂O (moisture) analyser allows fast and accurate oxygen analysis over the full oxygen range (10e-20ppm to 100% O2) and a range of H₂O concentrations (measured in terms of dew-point) from -65°C to +20°C dp. The analyser provides continuous on-line analysis, with a typical response time less than 5 seconds for a 90% response to a step change oxygen gas compositions and 30 seconds for dew-point. The dew-point sensors are OEM modules provided by either Michell Instruments or Alpha Moisture depending on range requested.

At the heart of the Rapidox 3100D is a top-of-the-range linear-piston vacuum pump manufactured by Nitto; a world leader in pump technology. The pumps are exceptionally quiet (40 dB/m or less). The flow of gas can be adjusted using the flow gauge / needle valve on the front panel of the analyser. Typical flow rate is 1 litre per minute The oxygen sensor head is located inside the analyser and comprises a zirconia ceramic tube that needs to be heated up to 650°C before it will conduct oxygen ions. An internal pressure sensor compensates for small changes in gas pressure to keep the readings stable.

The dew-point sensors are high precision transmitters that are fully factory calibrated and is supplied with its own Calibration Certificate, providing direct traceability to both UK (NPL) and US (NIST) Humidity Standards The sensor is certified at thirteen dew-point levels across its operating range against a certified reference hygrometer, using a mass-flow humidity generator system as a source of reference calibration gas. The analyser is packed with features including fully programmable alarm circuits, programmable analogue outputs, easy calibration (user selectable gases), RS232 / RS485 communications, independent type K thermocouple and a full set of communications / data-logging software. Full data logging of O2 & H2O together with temperature and pressure is possible using the MS-Excel compatible logging software.

Features

Applications

Continuous gas sampling via powerful yet silent internally located linear piston pump Flow rate controlled by needle valve / flow gauge on front panel Fast measurement response (typically 5 seconds for a 90% response) Full O2 measurement range available (10e-20 ppm to 100% oxygen) High accuracy maintained throughout the measurement range. Accuracy ± 1% of the actual measured oxygen with a precision ± 0.5% User-specified H2O dew-point ranges available (-100°C / +20°C or -65°C /+20°C). H2O dew-point can be displayed in terms of °C dp, °F dp or ppmv. Independent type K thermocouple fitted as standard.  Range 0-1250°C Easy to calibrate by the user using ANY TWO gases (air is usually chosen for convenience) RS232 (or RS485), 0-5V or 4-20mA current loop outputs (both user programmable) Windows data logging software with MS-Excel compatible graphing included Fully programmable alarms (low and high condition) with outputs and visual warning Internal pressure sensor with automatic pressure correction

Laboratory scale furnace experiments where the control and monitoring of residual oxygen and moisture are critical Applications where extremely dry gases must be used Industrial gas production gases used in medical applications or electronics production Catalytic reformer cycle Moisture in natural gas Moisture in high-voltage switchgear quench gases Monitoring of desiccant dryers for compressed air or plastic moulding apparatus

Download a full R3100D oxygen and dewpoint specification (pdf)

For more information, please contact Technical Sales who would be delighted to discuss your needs