OMS 420 Ex
O2 & COe in-situ monitoring system for use in hazardous area zone 2
The O2 and COe monitor is dedicated for continuous combustion optimisation at:
- various industrial furnaces/ovens/boilers, with hazard of explosive atmosphere
- petroleum refinery plants
- petrochemical plants
- gas separation, blast furnace, coke oven or ther syngas plants
- Hazardous area designation of use: Zone 2 or Class 1, Div 2, Gr A/B/C/D
- Special IP 65 pressurized cabinet and z-purge controller, complying to II 3G Ex pz II T3 Gc
- Easy and fast, on site replaceable detector head with sensors (O2 & COe)
- Integrated control unit with backlit display, operating key pad, dual galvanic isolated 4 ... 20 mA output and digital output RS 485 (Modbus RTU)
- Stainless steel SS316Ti flange 4" ANSI-150Ibs with flow guidance probe tubes, from 250mm up to 2m length
- Unique hot solid electrolyte sensor for combustible COe-measurement without need for sample dilution with air as required for catalytic bead sensors (Pellistors) (Option)
- Unique blow-back system for dusty flue gases (Option)
- Integrated auto-calibration for accurate measurements (Option)
- Dust tight and water proof enclosure, with optional ATEX heater for very low ambient air temperatures or optional ATEX Vortec cooler for high ambient temperatures
Measuring range
| O2 | 0 ... 25 % (zirconium dioxide) |
| COe | 0 ... 1.000 ppm (hot solid electrolyte) |
| Temperature | up to 1.000 °C |
| Pressure | 900 to 1.100 mbar |
| Flow Velocity | min. 1 m/sec to max. 30 m/sec |
Dimensions and other data
| Warm up time | Minimum 30 minutes |
| Ex classification | II 3G Ex pz II T3 Gc |
| Response time | < 10 seconds |
| Flange | flange 4" ANSI-150lbs, stainless steel 1.316Ti |
| Probe tube length | 250 mm to 2.000 mm, Inconel steel |
| Interfaces | Dual, analog output 4 ... 20 mA, isolated, max. load 500R, RS 485 digital interface (Modbus RTU), DIN-rail RS 485/Profibus converter |
| Calibration | Manual or automatic (user free settable), 1 point (offset) or 2 points (offset and span) |
| Power supply | 100 ... 240Vac / 47 ... 63 Hz / 100 W (300 W with cabinet heater) |
| Compressed air | 6 ... 8 bar, free of dust, oil and water free (DP -20°C or less) |
| Ambient conditions | +5°C ... +45°C (+65°C with ATEX vortec cooler) and -45°C ... +45°C with cabinet heater |
| Dimensions | 650x500x350 mm (HxWxD) |
| Protection | IP 65 |
| Weight | approx. 25 kg |
