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Stainless steel bimetal thermometer with 3 inch glass dial and 4 inch stem

Dwyer Instruments Inc.

Dwyer Instruments BTM3404D bimetal thermometer -40 to 160 F -40 to 71.1 C measurement tool

SKU CH-PC7A-X3RA9

Records minimum and maximum temperatures from -40 to 160 °F with a 3-inch stainless-steel dial and glass lens

  • TypeEnvironmental & Mechanical
  • Tracks min and max temps with bimetal coil
  • Reads -40 to 160 °F and -40 to 71.1 °C
  • 3 in dial gives clear analogue readout
  • 4 in stem with 1/2 in NPT fits standard ports
  • Stainless housing and glass lens resist harsh environments

Industrial Temperature Monitoring

The Dwyer Instruments BTM3404D is a bimetal thermometer built for industrial environments that require reliable temperature readings without external power. It suits maintenance technicians, plant engineers and HVAC specialists who need a durable, direct-mount instrument for process piping or equipment.

Sustained Measurement Stability

The bimetallic sensing element responds to temperature changes through mechanical expansion, so its indication remains consistent during continuous operation. No battery or signal conditioning is involved, eliminating drift from electronic ageing or power interruption. The stainless steel housing and glass lens protect the movement in harsh ambient conditions.

Direct-Mount Interface Limits

Connection is made via a 1/2 inch NPT rear fitting, which threads directly into a process port or thermowell. The four inch stem must reach the flowing medium for accurate sensing, so installation depth is constrained by that length. The dial reads both Fahrenheit and Celsius across the full -40 to 160 degrees F and -40 to 71.1 degrees C span.

Highlights

  • Tracks min and max temps with bimetal coil
  • Reads -40 to 160 °F and -40 to 71.1 °C
  • 3 in dial gives clear analogue readout
  • 4 in stem with 1/2 in NPT fits standard ports
  • Stainless housing and glass lens resist harsh environments

Specifications

BrandDWYER INSTRUMENTS
TypeEnvironmental & Mechanical

Questions about this item

Does the BTM3404D need power or make noise during continuous monitoring?

The bimetal thermometer operates mechanically without power, so it runs silently and generates no heat during all-day use.

What mounting fitting must the buyer provide for the 1/2 in NPT back connection?

You need a 1/2 in NPT threaded port or fitting on your tank or pipe to screw the stem into.

Will the 3 in dial and 4 in stem fit alongside older gauges on the same panel?

The 3 in dial and 4 in stem dimensions match many legacy panel cut-outs, letting it sit beside existing instruments.

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