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Stainless steel bimetal thermometer with 3 inch glass dial showing 150 to 750 degrees Fahrenheit

Dwyer Instruments Inc.

Dwyer Instruments Inc. BTM3258D Bimetal Thermometer 3 in Dial 150 to 750F

SKU CH-68Z6-XB6R6

Bimetal thermometer with a 3 in dial measuring 150 to 750 °F, 2.5 in stem and 300 stainless steel housing

  • Product typeEnvironmental & Mechanical
  • Wide temperature range covers 150 to 750°F for high-heat applications
  • 3-inch dial provides clear, easy-to-read measurements at a glance
  • 5-inch stem length suits standard industrial fittings and installations
  • 300 stainless steel housing resists corrosion in harsh environments
  • Glass lens protects the dial from damage and contamination

Industrial temperature monitoring

The Dwyer BTM3258D bimetal thermometer measures temperatures from 150 to 750 degrees Fahrenheit with a 3 inch dial. It is built for plant engineers and maintenance technicians who need direct local readings on pipes or vessels. The 1/2 inch NPT back connection threads into standard process fittings. A NIST-traceable certificate is not included with this model.

Sustained high-temperature service

The bimetal sensing element operates continuously across the full 150 to 750 degree Fahrenheit range without electronic drift. The 300 stainless steel housing and stem resist corrosion in harsh process environments. The 2.5 inch stem length positions the sensing area within the media flow for stable indication. Glass lens protects the dial face from contamination and impact during long-term installation.

Rugged construction for daily use

The all-stainless housing withstands vibration and wash-down cycles common in industrial settings. Back-mounted NPT threads allow direct insertion into existing thermowells or pipe couplings. Glass lens maintains clarity where plastic would yellow or craze. The dial provides immediate visual confirmation without power or signal wiring.

How it compares

Measured against everything we stock in Meters, Testers & Measuring Tools, at today’s prices. Recalculated every night.

Price $88.99
Pricier than about 62% of the 3,030 comparable items (median $54.99).

Specifications

Product
Brand nameDWYER INSTRUMENTS
Product typeEnvironmental & Mechanical

Questions about this item

How much heat does the 3 in dial bimetal thermometer generate when measuring continuously up to 750°F?

The bimetal element operates passively without power, so it adds no measurable heat to the process being monitored.

What fitting must already be on the pipe or vessel for the 1/2 in NPT stem to install?

A female 1/2 in NPT threaded port is required to accept the thermometer's back-connected stem.

Will the 300 stainless steel housing and glass lens withstand the same thermal cycling as my existing carbon-steel piping?

The 300 stainless housing and glass lens tolerate the full 150 to 750°F range, but differential expansion with carbon steel should be evaluated for the specific installation.

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