WIKA Model 70 Expansion thermometer

$100.00

The WIKA Model 70 is a mechanical expansion thermometer designed for reliable temperature measurement in industrial processes. Using a liquid-filled measuring system, it provides accurate local temperature indication and allows remote reading through a capillary connection between the probe and the dial indicator.

Typical Applications:
• Industrial process temperature monitoring
• Chemical and petrochemical plants
• Machine building and equipment manufacturing
• Power generation facilities
• Applications requiring remote mechanical temperature indication

Not Recommended For:
• Applications requiring electronic signal transmission to control systems
• Ultra-high precision laboratory calibration tasks

WIKA Model 70 Expansion thermometer

Selection Notes

• Confirm the required temperature measurement range for the process.
• Select the appropriate stem length and immersion depth for proper measurement accuracy.
• Determine the required capillary length when remote indication is needed.
• Verify the suitable process connection type (e.g., threaded or flanged).

Why Choose the WIKA Model 70 Expansion Thermometer

Reliable Mechanical Measurement
Liquid expansion measuring system ensures dependable temperature indication without external power.

Remote Temperature Indication
Capillary connection allows the dial indicator to be mounted away from the measuring point.

Robust Industrial Design
Designed for long-term operation in demanding industrial environments.

Clear Dial Display
Large dial ensures easy temperature reading during plant operation.

Low Maintenance Operation
Mechanical system reduces the need for complex electronics or signal conditioning.

FAQ

Q: How does the Model 70 expansion thermometer work?
A: It uses the thermal expansion of a liquid inside the measuring system to move a pointer on the dial, indicating temperature.

Q: Does the thermometer require electrical power?
A: No. It is a purely mechanical instrument and operates without electricity.

Q: Can the dial be mounted away from the measuring point?
A: Yes. The capillary connection allows remote mounting of the dial indicator.

Q: Where is the Model 70 typically used?
A: It is commonly used in industrial plants, machinery, and process equipment requiring reliable local or remote temperature indication.

Nominal size in mm

63, 100, 160

Design of connection

1 Plain stem (without thread)
2 Male nut
3 Union nut
4 Compression fitting (sliding on stem)
5 Union nut with fitting
6 Compression fitting (sliding on capillary)

Fill medium measuring system

Xylol or silicon oil

Instrument version and type of mounting

B Instruments with capillary; centre back mount
triangular bezel with bracket
H Instruments with capillary; lower mount (radial)
surface mounting flange
M Instruments with capillary; lower mount (radial)
surface mounting bracket, aluminium die cast
V Instruments with capillary; back mount 1)
panel mounting flange
A Back mount 1), fix
plain stem, threaded connection or thermowell
R Lower mount (radial), fix
plain stem, threaded connection or thermowell
S Back mount 1), fix
plain stem, threaded connection or thermowell;
swivelling approx. 90 ∢°

Accuracy class

Class 2

Rated operating ranges and conditions

EN 13190

Capillary entry

Lower or back

Case

Stainless steel

Bezel ring

Stainless steel

Connection

Stainless steel 1.4571

Capillary

Length to customer specifications (max. 10 m), Ø 2 mm,
stainless steel 1.4571, bending radius not less than 6 mm

Stem

Ø 8 mm, stainless steel 1.4571

Active length of sensor

Depending on Ø d and scale range

Dial

Aluminium, white, black lettering

Pointer

Aluminium, black

Window

NS 100, 160: Instrument glass
NS 63: Transparent plastic

Temperature limits for storage and transport

-50 … +70 °C (EN 13190) without liquid damping
-20 … +60 °C (EN 13190) with food-compatible liquid
damping
-50 … +60 °C (EN 13190) with liquid damping

Ambient temperature limit at the case

0 … 40 °C max. (others on request)

Pressure rating of stem

25 bar max., static

Ingress protection

IP 65 per EN 60529 / IEC 529

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