Wika 70-8xx Bedienungsanleitung PDF herunterladen (Seite 8)

11472988.02 04/2013 GB/D/F/E

WIKA operating instructions expansion thermometer, model 70

3. Specications

Specications with micro switch without micro switch

Nominal size in mm 100 63, 100, 160

Measuring principle Bourdon tube system

Filling medium Xylol, silicone oil or syltherm Xylol or silicone oil

Capillary entry lower mount or back mount

Case Stainless steel

Indication accuracy Class 2

Scale range -100 ... +400 °C

Measuring line Ø 2 mm, stainless steel 1.4571

Length of the measuring line Max. 10 m

Contact max. 2 micro switches (adjustable/xed)

Load data

5 A, AC 48 V

The instruments do not provide for incorporated overcurrent

protectors. In order to prevent the contacts from welding through

overload, suitable protection systems must be implemented by

the operator.

Setting range from 10 % to 90 % of the full scale value

Fixed, factory set to customer specication

Standard switch dierential < 2 % of measuring range

Electrical connection via cable terminal box

Ingress protection

per EN 60529 / IEC 529

IP 44 IP 65

For further specications, see WIKA data sheet TV 28.01 or TM 81.01 and the order

documentation.

4. Design and function

4.1 Description

The liquid-lled, closed measuring system consists of a temperature sensor, a capillary

and a Bourdon tube. The volume change as a consequence of the heat applied to the

temperature sensor, and thus the pressure change in the closed system, is transmitted

through the capillary to the Bourdon tube and then indicated on the dial by the angular

deection of the pointer shaft.

Temperature measuring instruments with micro switch (temperature controllers)

The switching disc (cam disc) connected to the pointer shaft actuates the switching

operation on the micro switch when the switch point is reached.

3. Specications / 4. Design and function

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Wika 70-8xx Bedienungsanleitung Seite 8