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Stainless steel dial thermometer with glass lens, 3 inch face, 4 inch stem, back connection

Dwyer Instruments Inc.

Dwyer Instruments BTM3408D bimetal thermometer 150 to 750 F 65.5 to 398.9 C

SKU CH-512V-80KE0

Measures 150 to 750 °F (65.5 to 398.9 °C) with a bimetal dial and includes a NIST-traceable certificate

  • TypeEnvironmental & Mechanical
  • Measures extreme heat up to 750 °F for high-temperature processes
  • Reads down to 150 °F covering broad industrial ranges
  • Displays Celsius from 65.5 to 398.9 °C for metric workflows
  • Stainless-steel housing and glass lens resist harsh environments
  • 1/2 in NPT back connection simplifies panel installation

Industrial temperature monitoring

The Dwyer Instruments BTM3408D is a bimetal dial thermometer built for fixed-position monitoring in industrial environments. It provides direct-read temperature indication without external power, making it suitable for maintenance teams, plant operators and process engineers who need reliable local display.

150 to 750 °F measurement range

The single specification that determines fit is the dual-scale range of 150 to 750 °F (65.5 to 398.9 °C). If the process temperature falls outside this window, the instrument cannot indicate accurately and a different range must be selected.

Stainless-steel housing with 4 in stem

The stainless-steel case and glass lens withstand typical industrial atmospheres, while the 4-inch stem reaches into pipes or vessels through a 1/2-inch NPT back connection. It handles continuous duty at the upper end of the scale but is not intended for temperatures above 750 °F or for applications requiring electrical output.

Highlights

  • Measures extreme heat up to 750 °F for high-temperature processes
  • Reads down to 150 °F covering broad industrial ranges
  • Displays Celsius from 65.5 to 398.9 °C for metric workflows
  • Stainless-steel housing and glass lens resist harsh environments
  • 1/2 in NPT back connection simplifies panel installation

Specifications

BrandDWYER INSTRUMENTS
TypeEnvironmental & Mechanical

Questions about this item

What does the 150 to 750 F range mean when I install this thermometer?

It measures temperatures from 150 °F up to 750 °F, so it covers high-heat processes such as ovens, furnaces or exhaust streams.

How does the 1/2 in NPT back connection limit what I can mount it on?

The 1/2 inch NPT thread screws into a matching female port; you need a 1/2 NPT tapping or adapter on the vessel or pipe.

What clearance does the 3 in dial and 4 in stem need to fit?

Allow at least 3 inches diameter for the dial face and 4 inches of straight stem insertion depth behind the mounting surface.

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