Thermocouples with Ignition Protection Exd

These immersion and insertion thermocouple thermometers comprise a rugged installation fitting made of stainless steel or Inconel with thread, flange or weld-on connection, a cast aluminium connection head and a removable measuring element. The insert can be replaced without emptying the installation, because the customised thermowell remains in the installation and seals the process. The instruments are supplied with ignition protection Exd as standard so can be installed in relevant hazardous areas.

A thermocouple rated to DIN EN60584 part 2, class 1 or 2 is fitted in each measuring insert .  Alternatively, it can be designed as a single or double thermocouple thermometer. Optional head transmitters, encapsulated in epoxide resin inside the connection head, are available to transmit measuring signals noise-free over long distances, with either a  4-20 mA signal , or with HART® protocol or PROFIBUS®/Fieldbus.  The immersion length, connection head, materials, process connection and tolerance classes can all be customised to meet your requirements.

These thermocouple thermometers with thread-, flange- or weld-on connection are ideal for temperature measurement in liquids, solids and gaseous media. The reliable water tightness of these installation methods is critical when dealing with gauge pressure and vacuum.  Applications include the air-conditioning and cooling industry, and heating-, furnace-, mechanical- and apparatus-construction. Supplied with ignition protection Exd, these ATEX Exd thermocouples are perfect in hazardous areas.

This ATEX Exd sensor is also available as a Resistance Thermometer.

Please ask for more information.


Measuring ranges: max. 1100 °C
Thermocouples: Insertion and Immersion NiCr-Ni or Fe-CuNi, Class 1 0r Class 2
Output: sensor type or analogue 4-20 mA
Thermowells: up to 1000, 3000 respectively 5000 mm (depending on model)
Option: headtransmitter with HART®-protocol or PROFIBUS®/Fieldbus, display
Connection: thread, flange, weld-on sleeve 
Pressure: pmax 250 bar
Applications: ATEX, ignition protection Exd

Technical Data

Measuring Range: 1.4404, max. 750 ºC, others, max. 1100 ºC
Sensor: Single or double sensor
Accuracy: Class 1 or Class 2
Ambient temperature: -40 … +150 °C with ceramic terminal base (without transmitter) -40 … +85 °C (with transmitter) -20 … +70 °C (with LCD display) -20 … +80 °C (with LED display)
Operating pressure: up to 250 bar (depending on thermowell)
Connection head: from XD with chain
Cable entry: : M 20 x 1.5 standard (others on request)
Materials – Sensor: stainless steel 1.4404 (Type J) Alloy 600 (Type K)
Materials – Thermowell: stainless steel 1.4404 (others on request)
Materials – Neckpipe: stainless steel 1.4404
Materials – Connection head : aluminium, painted
Materials – Terminal base: ceramic (without transmitter)
Process Connection – Thread: G ½ male, G ¾ male, G 1 male, ½” NPT, ¾” NPT, 1″ NPT
Process Connection – DIN-flange:  DN 15, 20, 25, 32, 40, 50
Process Connection – ANSI-flange: : ½”, ¾”, 1″, 1½”, 2″
Process Connection – Weld-in: ¾”, 1″, 1¼”
Sensor wiring: 2-wire
Protection: connection head IP 54 … 68 depending on cable gland and sealing sensor IP 68
ATEX-approval: Ex II 2 GD Ex d IIC T6
Head transmitter – Output: analogue output 4-20 mA
Head transmitter – Communication: HART®-protocol, Profibus®/ Fieldbus
Head transmitter – Minimum meas. span: standard transmitter 25 K transmitter with HART® 10 K transmitter with Profibus®/Fieldbus 5 K
 Head transmitter – Supply voltage: 8 – 35 VDC for standard transmitter and transmitter with HART® 9 – 32 VDC for transmitter with Profibus®/ Fieldbus
Display – Type: 4 digit LCD or LED
Display – Supply: loop powered
Display – Voltage drop out: LCD max. 2.5 V LED 3.3 V at 4 mA 3.7 V at 20 mA