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Adjust the setpoint value / limit value with a screwdriver
Important information for installation and operation!
When used as a safety device for explosion protection in compliance with EU Directive 94/9/EC
Annex II Clause 1.5, it is necessary to run a functionality test in accordance with the applicable
requirements.
The installer must establish the switching point in a routine thermal test and put safeguards in
place to prevent it being changed. Attention should be paid to:
• Probe geometry and thermal coupling
• Max. ambient temperature
• Max. product temperature
Setting the limit value in accordance with the scale:
Use the internal scale to set the limit value on the setpoint adjuster. Safeguard the setting by
sealing the setpoint adjuster (e.g. with temperature-resistant screw-locking varnish).
Setting the limit value in accordance with installation-specific operational characteristics:
Heat the capillary bulb to the required limit temperature (temperature adjustment time at least
5 minutes), record and monitoring the exact temperature on the temperature probe with a
calibrated reference measuring device.
Turn the setpoint adjuster from low scale limit value towards the upper scale limit, determine the
required switching point position (circuit 1-2 opens and electrical circuit 1-4 is closed).
Safeguard the setting by sealing the setpoint adjuster (e.g. with temperature-resistant screw-
locking varnish).
Response to measuring system fracture
If the measuring system is destroyed (i.e. the expansion liquid leaks) then the membrane
pressure falls and the circuit will be permanently opened in the case of an STW or STB. On an
STB, resetting is no longer possible.
Response to low temperature
If the probe temperature on an STW or STB falls below about -40 °C, the electrical circuit will
open, but will automatically close again when the temperature rises.
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