BA_066 Rev 1J6 Mechanical thermometers
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Measuring devices where oil or grease residues in the measuring element are not
permitted are marked on the scale with the oil can
icon.
Measuring devices for use with oxygen are marked on the scale with the oil can
icon
and the word “oxygen” directly below this.
3.2 Options for gas expansion thermometer
3.2.1
Operation with capillary
Route the capillary in a fixed and low-vibration manner. Note the specified maximum
permissible ambient temperature on the data sheet. Exceeding the specified temperature
limits can affect the measuring result.
3.2.2
Operation with contact sensor
Fix the slightly U-shaped temperature probe to the pipe with steel strips. Insulate the
measuring point and the temperature probe to the ambient temperature to ensure that the
measuring result is not affected. With the “adjustable display“ option it is possible to rotate
the housing around ±180° to the pipe after installation by loosening the screw connections,
thereby achieving the optimum position.
3.3 Electrical Connection
Complete the mechanical installation before you connect the device electrically. Set up all
electrical connections while the voltage supply is switched off.
3.4 Adjusting of contacts
Setting the contact can be done by using the adjustment lock in the centre of the sight
glass. Just press down the separate or permanently mounted key (Figure 1) until the
pointer of the lock catches the adjusting pin of the contact (Figure 2).
Figure 1: Key
Figure 2: Setting the contact
The set pointer can be adjusted over the entire scale range. It must be ensured that the
contact will be set in a clockwise direction only. If the contact is accidentally set behind the
desired value, turn back the contact at least 5% below the desired value and make the
setting again in a clockwise direction.
The functionality and thus the switching reliability of the built-in switch contacts is
guaranteed within the entire nominal range. Following valid standards though the accuracy
stated in the data sheet is assured for switching points that are set between 10% and 90%
of the nominal range only. Operating the contact outside of the scale range is not
permitted.
You can find additional information on contacts in the document TA_039, available on our
website at www.labom.com.
