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

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.