CC33 Transmitter aluminum

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

If you need to safely monitor combustible gases and vapors in Ex zones, the CC33 transmitter is an extremely durable and reliable solution - even in demanding conditions, such as in industrial production plants. The CC33 can communicate its measured values and status indications either on analog (4-20 mA) or digital (RS-485) signal. The current measured gas concentration is also shown on an LC display. Due to the special stack effect, the response times of the CC33 are very short which ensures quick warnings in case of explosion hazards. Three relay outputs provide additional alarm options. In combination with one of GfG’s reliable controllers, the CC33 can either be installed in a new gas detection system or retrofitted into an existing one.

The CC33 uses catalytic combustion (CC) to detect flammable gases and vapors such as methane, propane and hydrogen as well as ammonia. Their long-life sensors make 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). Its automatic temperature compensation and the linearisation of the measuring signals ensure high measuring accuracy. In the event of an alarm, two red LEDs light up and the display color changes to red. The three optional relay outputs can be used to automatically trigger an explosion-proof buzzer, visual warnings such as flashing lights or the ventilation in case of an alarm.

Communication and service
Signals are transmitted on the analog industrial standard (4-20 mA) or via the digital RS-485 interface (Modbus protocol). The CC33 is also able to utilize ACDC technology, which enables it to transmit digital data on analog, three-wire lines in systems using an ACDC-capable controller. It uses two status LEDs to indicate its operating status and also features two additional alarm LEDs and three relay LEDs. Service and adjustments can be carried out on site with a magnetic pen and three magnetic buttons behind 15 mm thick bullet-proof glass (one-person adjustment).  The pre-adjusted sensors can be easily replaced thanks to Smart Sensor technology. The multi-color backlit display shows the current measured value, status messages and the CC33's menu. Test gases for function tests can be inserted using a calibration adapter. Alternatively, when the device is mounted in a difficult-to-reach location, an optional remote calibration adapter can be used 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 aluminum housing and Viton seals guarantee a long operating time even in the toughest conditions. The transmitter is protected against the ingress of dust and water according to IP54. If required, the protection class can be raised to IP67 by means of additional thread seals. For applications requiring a stainless steel housing, the CC33 is also available in an unpainted stainless steel housing.

Key features at a glance:

General information:

  • Measuring principle: catalytic combustion (CC)
  • For flammable gases and vapors
  • Pressure-resistant encapsulated housing made of aluminum with bulletproof glass (10 mm)
  • 2.2-inch color display
  • Expected sensor lifetime: 5 years
  • Signal transmission: 4-20 mA / RS-485 / ACDC
  • 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

To facilitate regular function checks of transmitters
» more

Test gases

Find an overview of our test gases here
» more

Accessories CC33

Find the complete list of accessories for the CC33 here
» download PDF

Our experts are happy to answer your questions! How to find us