CSN® Ex flow heater type 94 Ex

Ex flow heaters (industry) for outputs up to 30 kW (AH) and 50 kW (AHA) and for heating flowing liquid and gaseous media.


Our CSN® industrial flow heaters (AH) offer compact solutions for outputs of up to 30 kW and are ideal for heating flowing liquid and gaseous media. For even higher requirements, our CSN® Ex instantaneous water heater (AHA) is available, offering outputs of up to 55 kW. Both models enable efficient heating in potentially explosive environments. The AHA series can alternatively be equipped with integrated temperature monitoring to ensure additional safety.

Product advantages

  • Powerful and robust design
  • Heating elements as tubular heaters and high-performance cartridge heaters
  • Approval for Zone 1 and Zone 21
  • Type of protection Ex det
  • Approval according to ATEX and IECEx. Further approvals (Peso, CCC, EAC) available
Also available with explosion protection

Technical data


Zone 1, Zone 21



Optional: Peso, CCC, EAC

Temperature class

T1 to T6

Ambient temperature range

Standard -40°C to +40°C

Power (kW)

0.2 to 30 (AH)

0.2 to 55 (AHA)

Voltage (V)

up to 1000

Protection class

IP 66


Liquid and gaseous

Process data

Medium, pressure and temperature according to specification

Housing / inlet and outlet nozzles

Flange connections and others

Heating elements

Tubular heaters

High-performance cartridge heaters

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 / aluminium (painted/powder-coated)

Installation length of heating elements (mm)

300 - 3500 for tubular heaters,

up to 6000 for high-performance cartridge radiators

Temperature monitoring

AH: without (standard); optional: external temperature controller, external temperature limiter, external sensors

AHA: without (standard); optional: external temperature controller,

internal/external temperature limiter, internal/external sensors


94F = for liquids

94GB = for gases, Ex zone on heating element

94GN = for gases, no Ex zone on the heating element

Customised versions on request

The following certifications are available on request:

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