240634 / 8146662300
2016-07-11·BA00·III·en·02
Operation
17
(Double) temperature controller and
limiter
Series 8146/5041, 8146/5051
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8.1
Adjustment of temperature controller
Setpoint adjustment of temperature controller
Adjustments of limiting values for temperature limiter
• A functional test is reequired, according to the relevant regulations, e.g. 94/9 EG.
Setting the limit value according to the scale
• Set the limit value on the setpoint adjuster above the scale.
• Secure the setting by sealing the setpoint adjuster
(e.g. using a temperature-resistant screw locking varnish).
Setting the limit value according to the operation-specific properties of the system
• Heat the temperature sensor - inside the system - to the desired limit temperature
(allow at least 5 minutes for temperature to equalize), while measuring and monitoring
the exact temperature on the temperature sensor with a calibrated comparison
measuring instrument.
• Determine the desired switching point position by rotating the setpoint adjuster from
the scale value toward the initial scale value (open circuit 1 ... 2 and close circuit 1 ... 4).
For the temperature limiter, the setpoint adjuster must be additionally sealed (e.g. using
a temperature-resistant screw locking varnish)
9
Operation
Depending on the ambient conditions, the following situations can occur during operation
Unlocking the temperature limiter
After the value has dropped by about 10% below the set limit value, the temperature
limiter can be unlocked.
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• Adjust the desired setpoint on
the temperature scale using
a screwdriver.
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• Manually push the release bolt in until
it snaps into place (refer to opposite
drawing).
• The temperature limiter is unlocked.
