The Rapidox 2100-FGA measures oxygen down to 10E-30 ppm in hydrogen forming gas and calculates the H2O dewpoint by thermodynamics, with a typical response under 4 s.
Advantages
A range built for forming gas
The zirconia sensor extends its measurement down to 10E-30 ppm O2, covering the ultra-low partial pressures of forming gas mixtures; with insertion sample tubes it operates up to 1000 °C.
Dewpoint without a moisture sensor
The analyser resolves thermodynamic equations to deliver the H2O dewpoint of the mixture: the operator enters the hydrogen content and the value is displayed in °Cdp or ppmV alongside the oxygen reading.
Fast, continuous response
Analysis is on-line, with about 4 s for a 90 % response to a step change; temperature is read at the sensor head up to 660 °C and by the standard type K thermocouple above that.
Hot-swap sensor
The pre-calibrated sensor is replaced on site without a PC, keeping downtime to a minimum.
Connected to the process
Programmable alarm relays and analogue outputs, RS232 and Modbus RTU communications, auxiliary socket for 4-20 mA transmitters and data-logging software.
Applications
- Hydrogen forming gas in metal heat treatment.
- Annealing, sintering and brazing atmospheres.
- Manufacturing under protective atmospheres.
- Research and development.
About the product
The Rapidox 2100-FGA is a special variant of the zirconia oxygen analyser for continuous duty, panel mounted (19-inch) or in a wall-mountable IP65 housing, with sensors up to 25 m away. It complies with EMC Directive 2004/108/EC and carries UL/ETL certification UL-61010-1.
Available accessories: calibration kit, calibration service, multiplex sampling system, sample pump, wall-mount cabinet, auxiliary pressure sensor, vacuum fittings (CF50, ISO KF25), stainless probe, filters and thermal printer.
Technical specifications
| O2 range | 10E-30 ppm to 30 %; ±1 % of reading or 0.5 ppm |
| Response | ≈4 s for a 90 % step change; sensor life over 17 500 h |
| H2O reading | Dewpoint by thermodynamic calculation, °Cdp or ppmV |
| Maximum gas temperature | 650 °C (1000 °C with insertion probes) |
| Thermocouple | Type K, 0-1250 °C, ±1 °C (included) |
| Outputs | 0-5 V, 4-20 mA, RS232/RS485, Modbus RTU/Ethernet |
| Supply | 90-260 V AC, 50/60 Hz |
| Dimensions and weight | 250 × 263 × 150 mm; 3.5 kg with sensor |
Frequently asked questions
What is forming gas?
A nitrogen-hydrogen mixture used as a protective atmosphere in metal heat treatment; its oxygen partial pressures are extremely low, which demands the extended measurement range.
How is the dewpoint obtained?
By thermodynamic calculation: the operator enters the hydrogen content of the mixture and the analyser shows the dewpoint in °Cdp or ppmV together with the oxygen reading.
Can the sensor be replaced on site?
Yes. The pre-calibrated hot-swap sensor is exchanged locally without a PC.
Which mounting options exist?
Panel mount (19-inch) or wall-mountable IP65 housing, with the sensor remote up to 25 m.
