Back-Connected Bimetallic Dial Thermometer

Bimetallic Sensing Element and Axial Stem

This mechanical dial thermometer uses a helical bimetallic strip inside a straight rear sensing stem to indicate liquid, gas, or steam temperature without external power. The center-back stem exits perpendicular to the rear of the circular dial housing for direct horizontal reading on tank walls or pipe tees.

Metric Mounting Threads and Insertion Depths

Two metric mounting thread specifications are listed for the series—M16 × 1.5 and M27 × 2—integrated with hex wrench flats behind the case for installation into a matching boss or thermowell socket. Available stem insertion lengths span from 60 mm up to 3000 mm to suit different vessel wall thicknesses and pipe diameters.

Temperature Scales, Accuracy, and Materials

Series scale ranges cover spans within -40 °C to 600 °C (such as the 0–100 °C scale shown on the illustrated dial) with accuracy classes of 1.5 or 2.5. Stainless steel and aluminum alloy material options are listed across the instrument series for chemical, pharmaceutical, food, marine, and utility process lines.

Ordering and Thermowell Fit Checks

When specifying a thermometer, confirm the required temperature scale span, dial case diameter, mounting thread size (M16 × 1.5 or M27 × 2), stem diameter, and exact insertion length L. Also clarify whether stainless steel is required for both the wetted stem and the outer dial case, and whether a separate thermowell is needed.