Model 73-8xx

Gas-actuated thermometer with switch contacts

Stainless steel version

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  • Control and regulation of industrial processes
  • Monitoring of plants and switching of electric circuits
  • Universally suitable for machine building, plant, vessel, apparatus construction and food industry
  • Temperature measurement without any contact to the medium
  • Mounting in instrument boards, control cabinets, control panels

Special features

  • Instruments meet the highest standards of measurement technology
  • Case and stem from stainless steel
  • For external mounting on pipes and tanks
  • Gauges with inductive contacts for use in hazardous areas with ATEX approval
  • Gauges with electronic contacts for PLC applications


Wherever the process temperature must be shown in situ or in hard-to-reach locations, and where, at the same time, an electrical circuit also needs to be switched, the gas-actuated thermometers with switch contacts are ideally suited.

Due to the wide variety of possible designs, the model 73 gas-actuated thermometers can be perfectly adapted to any process connection or location. The adjustable stem and dial version can be adjusted to any angle to allow easy reading. With the contact bulb version (without any contact with the medium), temperature measurements are possible even when the pipe diameter is extremely small. When mounting this thermometer version, it must be ensured that the contact bulb is in contact with the measuring point over its complete length.

Switch contacts (electrical alarm contacts) make or break an electric control circuit dependent upon the position of the instrument pointer.

The switch contacts are adjustable over the full measuring range. The instrument pointer actual value pointer) moves freely across the entire scale range, independent of the setting. The set pointer can be adjusted via the window using a removable adjustment key (mounted on the terminal box).

Switch contacts consisting of several contacts can also be set to a single set point. Contact actuation is made when the actual value pointer travels beyond or below the desired set point.

For switch contacts, magnetic snap-action contacts, inductive contacts - for requirements to ATEX - or electronic contacts for PLC switching are available.

With capillary

With capillary

  • With capillaryBack mount
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