CC33 Transmitter aluminum

Transmitter for flammable gases and vapours with ignition protection type "d"

If flammable gases and vapours are to be monitored safely in Ex zones under demanding conditions such as in industrial plants, the CC33 transmitter is an extremely robust and reliable solution. The CC33 transmits measured values and status displays either analogue (4-20 mA) or digitally (RS-485). The currently measured gas concentration is also shown on an LC display. The special stack effect ensures shortest response times of a few seconds for a quick warning of explosion hazards. Three relay outputs provide additional alarm options. In combination with GfG's proven controllers, installation in new gas detection systems as well as retrofitting in existing systems is possible.

The CC33 uses catalytic combustion (CC; also heat tone or HT) to detect flammable gases and vapours such as methane, propane and hydrogen as well as ammonia. The long-life sensors make the 33 series transmitters an economical solution for detecting a wide range of combustible gases in the measuring ranges 0 to 100 % LEL and 0 to 4 % by volume (NH3). Automatic temperature compensation and linearisation of the measuring signals ensure high measuring accuracy. In the event of an alarm, two red LEDs light up and the display colour changes to red. The three optional relay outputs can be used to automatically control an explosion-proof buzzer, visual warnings such as flashing lights or the ventilation by alarm.

Communication and service
Signals are transmitted according to the analogue industrial standard (4-20 mA) or via the digital RS-485 interface (Modbus protocol). The transmitter indicates operating states via two status LEDs. In addition, two alarm and three relay LEDs are integrated. Service and adjustments are carried out on site via magnetic pen and three magnetic buttons behind 10 mm thick bullet-proof glass (one-man adjustment). The pre-adjusted sensors can be easily replaced thanks to the Smart Sensor technology. The multi-colour backlit display shows the current measured value, status messages and the menu of the CC33. Test gases can be added for function control with a calibration adapter. Alternatively, when mounted in a difficult-to-reach location, it is possible to use an optional remote calibration adapter without impairing the transmitter's stack effect.

Explosion and device protection
The CC33 is approved for use up to Ex zone 1 and meets the requirements of ignition protection type "d" (flameproof enclosure). The epoxy-coated aluminium housing and Viton seals guarantee a long operating time even under the toughest conditions. The transmitter is protected against the ingress of dust and water according to IP54. If required, the protection class can be brought to IP67 by means of additional thread seals.

Key features at a glance:

General information:

  • measuring principle: catalytic combustion (CC)
  • for flammable gases and vapours
  • pressure-resistant encapsulated housing made of aluminium with bulletproof glass (10 mm)
  • 2.2-inch colour display
  • expected sensor lifetime: 5 years
  • signal transmission: 4-20 mA / RS-485
  • protection class: IP67 (with thread sealing, otherwise IP54)

Approvals / Certifications:

  • ATEX certification: II 2G Ex db IIC T6 Gb
    (II 2G Ex db ib IIC T4/T6 Gb with buzzer)

Optionally available:

  • three relay outputs, magnetic rod, windscreen, flow adapter, remote calibration adapter, buzzer, threaded plug, cable gland

Detectable gases

LEL combustible gases
C2H2 Acetylene
C2H4 Ethylene
C2H6O Ethanol
C2H6 Ethane
C2H6O Dimethyl ether
C3H4 Propine
C3H6 Propene
C3H6O Acetone
C3H6O2 Methyl acetate
C3H8 Propane
C3H8O n-Propanol
C4H8O 2-Butanon (MEK)
C4H8O2 Ethyl acetate
C4H10 n-Butane
C4H10O n-Butanol
C5H12 Pentane (n)
C6H6 Benzene
C6H12 Cyclo hexane
C6H12O Methyl isobutyl ketone (MIBK)
C6H14 n-Hexane
C7H8 Toluene
C7H16 n-Heptane
C8H18 Octane (n)
C9H20 n-Nonane
CH4 Methane
CH4O Methanol
CO Carbon monoxide
H2 Hydrogen
NH3 Ammonia
Other gases on request.


Extensions and accessories

Remote calibration adapter

Remote calibration adapter

To facilitate the regular function check of transmitters
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Test gases

Test gases

You can find an overview of our test gases here
» more

Accessories CC33

Accessories CC33

Here you'll find the complete list of accessories for the CC33
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