CSN® Ex flow heater type 912Ex

CSN® Ex flow heater for outputs up to 500 kW, type of protection Ex d for heating flowing liquid or gaseous media and with temperature monitoring.


Our CSN® Ex flow heaters are designed for outputs of up to 500 kW and are ideal for heating liquid and gaseous media. These electric instantaneous water heaters are specially designed for use in potentially explosive environments and provide a reliable and efficient heat source. Thanks to their integrated temperature monitoring, you can precisely control the operating temperature and thus ensure a safe working environment.

Product benefits

  • Mining approval (device group I)
  • Type of protection Ex d
  • Version with replaceable heating elements possible
  • Integrated temperature monitoring
  • Extremely robust design
Also available with explosion protection

Technical data


Zone 1, additionally mining (equipment group I)



Temperature class

T1 to T6

Ambient temperature range

Standard -20°C to +40°C

Power (kW)

up to 500

Voltage (V)

up to 1000

Protection class

IP 54


Liquid and gaseous

Process data

Medium, pressure and temperature according to specification

Housing / inlet and outlet nozzles

Flange connections and other

Heating elements

Tubular radiators

Cartridge radiators

High-performance cartridge heaters

Housing materials


1.4404 (AISI 316L); 1.4541 (AISI 321); 1.4571 (AISI 316 Ti)

Heating element materials


1.4404 (AISI 316L); 1.4541 (AISI 321); 1.4571 (AISI 316 Ti);

1.4876 (Incoloy 800); 2.4858 (Incoloy 825)

Material of connection cover

Steel (painted)

Installation length of heating elements (mm)

300 - 3500 for tubular radiators

up to 6000 for cartridge radiators

up to 7000 for high-performance cartridge radiators

Temperature monitoring (version via intrinsically safe circuits (Ex i))

PT100 internal (standard)

Internal thermocouple (optional)

External temperature controller (optional)

External temperature limiter (optional)


912F = for liquids

912GB = for gases, Ex zone on heating element

912GN = for gases, no Ex zone on the heating element

Customised versions on request

The following certifications are available on request:

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