Thermometers

Bimetal Thermometers

A bimetal thermometer is a mechanical thermometer that transfers the movement of a helical bimetal coil, which bends with temperature, directly to the pointer to show temperature on the dial.

It is used on boilers, calorifiers, heat exchangers, heating and cooling lines and process tanks. The product range includes Ø63, Ø100 and Ø160 mm dial models with back and bottom connection, various stem lengths and stainless thermowells.

Ø63 – Ø160dial size (mm)

−30 … 500 °Cscale range (depending on model)

CL 2.0accuracy class

25 barmax. working pressure

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Main Applications

Boiler and calorifier temperature monitoring
Heating flow and return lines
Heat exchanger inlets and outlets
Chilled water circuits
Process tanks
Thermal oil and steam lines

Technical Data

Sensing element	Helical bimetal coil
Dial sizes	Ø63, Ø100, Ø160 mm
Scale ranges	Between −30…200 °C and −30…500 °C; 0/60 … 0/500 °C
Accuracy class	CL 2.0
Process connection	G1/2″ B; options 1/2″ NPT, G3/4″, 3/4″ NPT, G1″
Connection position	Back (axial) or bottom (radial)
Bimetal stem / thermowell	Ø9 mm / Ø12 mm
Insertion length	Ø63: 50–500 · Ø100: 50–1000 · Ø160: 100–1000 mm
Max. working pressure	25 bar
Protection / standard	IP51 / EN 13190

Material Options

Part	Ø63 dial	Ø100 dial	Ø160 dial
Case and bezel	AISI 430	AISI 430	Black painted steel
Window	Polycarbonate (≤120 °C) or glass	Glass	Glass
Pointer	Plastic (≤160 °C) or aluminium	Plastic (≤160 °C) or aluminium	Aluminium
Thermowell	AISI 316L or brass	AISI 316L or brass	AISI 316L or brass

Which material? Polycarbonate windows are used up to 120 °C and plastic pointers up to 160 °C; for higher scales, glass window and aluminium pointer types should be chosen. Values come from the thermometer manufacturer sheet.

Advantages

Needs No Power

Mechanical indicator

Wide Scale

Up to 500 °C

Removal with Thermowell

Replace without draining

Three Dial Sizes

Ø63, Ø100, Ø160

Construction and Design Features

Helical bimetal coil
Stainless case and bezel
Dial and pointer
Threaded process connection and stem

Send the dial size, scale range, connection position and stem length; we will confirm a suitable bimetal thermometer from stock.

How to Choose?

Connection and stemChoose thread, back / bottom connection and insertion length.
PressureUse a thermowell if line pressure exceeds 25 bar.
Temperature rangeChoose a range with the working temperature mid-scale.
Dial and materialChoose dial size and a glass window at high temperature.