Cyclohexanone LEL detector – online, flameproof, ATEX, SIL 2, display, relays

Cyclohexanone LEL gas detector monitors gas concentration in ambient air or in gas ducts /stream. It is flameproof or explosion-proof sensor transmitter with ATEX and safety integrity level SIL 2 certified for hazardous area Zone 1, 2 installation. It is ideal for installation in commercial and industrial applications like hydrocarbon industries, petrochemical, pharma, chemical plants, solvent & adhesive plants, warehouse, paint booth and so on.

It is available with LCD Display, on-board relay contacts, flashing alarm LEDs, auto diagnostic watch dog, non-intrusive calibration, with industry standard linear analog output.


Cyclohexanone LEL gas detector – explosion proof sensor transmitter – ATEX, SIL 2, Zone 1, 2

online, continuous detection and monitoring of LEL (flammability) of Cyclohexanone gas / vapour in air or gas stream ducts, flameproof / explosion proof certified Zone 1, 2 – ATEX, SIL 2, with / without display, contact relays, flashing alarm LEDs, RS485 serial interface with Modbus RTU protocol


Model: S2XX7

Cyclohexanone is a colorless to pale yellow liquid with a pleasant odor, reminiscent of that of acetone. It is less dense than water, lightly soluble in water and miscible with common organic solvents.

Cyclohexanone is an important industrial chemical as it is a chemical intermediate used in the production of specific target molecules. In fact, the consumption of cyclohexanone is linked almost entirely to the nylon industry with derivatives of it used to produce adipic acid and caprolactam, which are precursors for nylon 6.

Flash point 111°F. Vapors heavier than air.

Cyclohexanone gas sensor transmitter or detector is high accuracy, reliable, performance oriented, robust, industrial grade, flameproof or explosion proof instrument for LEL concentration detection. The instrument can be installed for flammability level or LEL detection of cyclohexanone concentration or leakage in all industrial and commercial area eg. chemical plant, solvent manufacturing unit, polymer industry, manufacturing plants, warehouse etc

The detector can be installed at walls, surfaces or in ducts for monitoring in gas or air sample. It is ATEX EEx’d’ certified with SIL 2 safety integrity level for hazardous area installation Zone 1 and 2.

The sensor transmitter offers linear, proportional analog output in industry standard current signals, over measuring range of 0 ~ 100% LEL (lower explosive limit). The detector works on highly sensitive catalytic bead based pellistor sensor cell, with low response time. It has unique feature of auto diagnostic watch dog with zero point tracking feature. Due to its 10-bit microprocessor based control unit, it offer high accuracy over long term. The detector is also equipped with sintered filter with flashback arrestor for enhanced safety.

Cyclohexanone LEL gas detector - online, fixed monitor, ATEX, SIL 2, metallic enclosure, LCD display
Cyclohexanone LEL gas detector – online, fixed monitor, ATEX, SIL 2, metallic enclosure, LCD display

Key Features:

  • Catalytic bead based Pellistor sensor cell with low flash energy
  • 10-bit microprocessor control unit
  • Non-intrusive one-man calibration via hall effect switches
  • ATEX certified explosion proof / flameproof, suitable for Zone 1, 2 gas explosion installation
  • Linear, proportional analog industry standard current output
  • Continuous system self-diagnosis with watch dog
  • Flashback arrestor with sintered filter
  • Auto Zero point tracking to zero point compensation
  • SIL 2 HW TUV certified
  • RS485 serial interface with Modbus RTU communication (optional)
  • 1 or 3 relay output module (optional)
  • System and alarm LED indicators (optional)
  • Modbus RTU communication over RS485 serial interface


Cyclohexanone gas sensor - online, fixed transmitter, ATEX, SIL 2, metallic enclosure, display, relays
Cyclohexanone gas sensor – online, fixed transmitter, ATEX, SIL 2, metallic enclosure, display, relays

Technical Specifications:

  • Measuring Parameters: LEL or flammable concentration of Cyclohexanone gas (1.10% v/v)
  • Sensor Technology: Catalytic bead based pellistor sensor cell
  • Measuring range: 0 ~ 100 % LEL
  • 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: 24V DC
  • 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


  • Polymer manufacturing
  • Chemical plants
  • Petrochemical units, polymer