WIKA DiwiTherm TR75, Руководство по эксплуатации

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11325232.05 09/2016 EN/DE/FR/ES
8 WIKA operating instructions DiwiTherm ® , model TR75
EN
Ambient conditions
Ambient and storage temperature -20 ... +60 °C
Vibration resistance (at sensor) 10 ... 500 Hz, 5 g, IEC/EN 60068-2-6
Shock resistance (at sensor) IEC/EN 60068-2-7
For further specifications see WIKA data sheet TE 60.75 and the order documentation.
4.
Design and function
4.1 Description
The DiwiTherm
®
model TR75 is the ideal combination of a digital display and a resistance
thermometer. This compact thermometer can be used in a wide range of applications and
works without an external power supply.
A wide variety of possibilities for the combination of insertion length, neck length, connection
to thermowell etc. are available for the thermometers, suitable for any thermowell and any
application.
Operation without thermowell is only recommended in certain applications.
Optionally, the DiwiTherm
®
model TR75 can be manufactured with a process connection for
measuring the temperature on a pipe's surface.
4.1.1 DiwiTherm
®
with sensor for insertion
Sensor
Material: stainless steel
Sensor length A ≤ 150 mm: Rigid sensor tube
The tubular design features a rigid construction to the metal sensor tip; therefore tubular
designs must not be bent. Internally, the measuring resistor is connected directly to an
insulated lead. Therefore tubular-design resistance thermometers can only be used up to the
temperatures specified for the lead (see operating temperatures).
Sensor length above 150 mm: Sheathed measuring cable (MI cable)
The junction between the metal part of the sensor and the connecting cable, when using MI
cable, is either crimped, rolled or potted, depending on the design. This area should not be
immersed within the process and must not be bent.
Compression fittings should not be attached to the transition. The type and dimensions of
the transition depend largely on the combination between input leads and metal sensor and
the sealing requirements.
The sensor diameter should be approx. 1 mm smaller than the bore diameter of the
thermowell or the blind bore, respectively.
3. Specifications / 4. Design and function