Key features:
1.Catalytic bead based pellistor sensor cell with low flash energy
2. 10-bit microprocessor control unit
3.Non-intrusive one man calibration via hall effect switches
4.Atex certified explosion proof / flameproof, suitable for zone 1, 2 gas explosion installation
5.Linear, proportional analog industry standard current output
6.Continuous system self-diagnosis with watch dog
7.Flashback arrestor with sintered filter
8.Auto zero point tracking to zero point compensation
9.Sil 2 hw tuv certified
10.Rs485 serial interface with modbus rtu communication (optional)
11. 1 or 3 relay output module (optional)
12.System and alarm led indicators (optional)
13.Modbus rtu communication over rs485 serial interface

Technical specifications:
Measuring parameters: hydrogen gas flammability or leakage
Sensor technology: catalytic bead based pellistor sensor cell
Measuring range: 0 ~ 100 % lel ( 0 ~ 4% v/v @ stp)
Response time (t90): < 30 sec
Control unit: 10 bit microprocessor based
Warm up time: < 5 mins
Auto zero point tracking for drift compensation
Power supply: 24 vdc
Ingress protection: ip65
Enclosure: stainless steel (for sensor cell), anti-static epoxy coated metal alloy (for transmitter)
Output: linear, proportional 4-20ma
Mounting: wall, duct, pipeline
Safety integrity level: sil 2
Atex marking: ce 722 ex ii 2g eex d iic t6, ce 722 ex ii 3g eex na iic t6
Optional: lcd display, alarm leds, potential free relay contacts
Hazardous area: zone 1, 2

Application:
1.Oil & gas, petrochemical, refinery
2.Battery rooms, ups facility
3.Mobile switching center (msc) of cellular / telecom site
4.Cracking plants
5.Hydrogenation plants
6.Chemicals
7.Cold stores
8.Pharmaceuticals, medicinal formulation