Temperature sensor
Components
15 TEMPERATURE MEASUREMENT PRECISE AND FLEXIBLE FOR EFFICIENT PROCESSES
1. Connection head
Connection heads for temperature sensors are in
accordance with EN 50446 industry standard,
which sets the electric and mechanical connection
requirements for thermowells, measuring insets,
transmitters and connection cables. For decades,
ABB has been continuously improving the design
of connection heads for one and two transmitters.
2. Extension tube
The extension tube protects the electronics from
high process temperatures. When process lagging
is used, the extension tube enables accessibility of
the connections above the lagging.
3. Process connection
Measuring elements can be connected directly
into the process using compression fittings. When
a thermowell is used it can be connected to the
process via a screwed connector or a flange to any
of a number of international standards. Additionally
a thermowell may also be provided in a design
suitable for welding into position.
4. Thermowell
A conventional thermowell consists of a seamless
tube, to which a base is welded on process-side.
A solid drilled thermowell is manufactured from a
single piece of bar material with a hole drilled to
within a few millimeters of the tip. A hole is cut in
the rod, ending a few millimeters below the top.
Both of these thermowell types provide protection
for the temperature sensor.
(a) Measuring inset
The measuring inset protects the temperature
sensor and increases the measuring accuracy.
The measuring inset can always be replaced
(for example for calibration) at any time, without
opening the process or shutting down the plant.
This allows for easy calibration of the measuring
inset.
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