JUMO 603070 heatTHERM-AT/heatTHERM-DR Data Sheet - Manual (Page 2)

2013-03-15/00485234
Data Sheet 603070 Page 2/15
JUMO GmbH & Co. KG
Delivery address: Mackenrodtstraße 14
36039 Fulda, Germany
Postal address: 36035 Fulda, Germany
Phone: +49 661 6003-0
Fax: +49 661 6003-607
E-mail: [email protected]
Internet: www.jumo.net
JUMO Instrument Co. Ltd.
JUMO House
Temple Bank, Riverway
Harlow, Essex CM20 2DY, UK
Phone: +44 1279 635533
Fax:
+44 1279 635262
E-mail: [email protected]
Internet: www.jumo.co.uk
JUMO Process Control, Inc.
6733 Myers Road
East Syracuse, NY 13057, USA
Phone: 315-437-5866
1-800-554-5866
Fax: 315-437-5860
E-mail: [email protected]
Internet: www.jumousa.com
Technical data
Switching function
Temperature compensation
Temperature controller TR /
temperature monitor TW If the temperature on the temperature probe exceeds the setpoint value, the microswitch is activated by the
transmission mechanics and the electrical circuit is opened or closed.
If the temperature falls below the selected setpoint value (by the amount of the switching differential), the
microswitch is reset to its initial position.
Safety temperature monitor
STW If the temperature on the temperature probe exceeds the setpoint value, the snap-action switch is activated
and the electrical circuit is opened or closed. If the temperature falls below the selected setpoint value (by the
amount of the switching differential), the snap-action switch is reset to its initial position.
If the probe has cooled down to a temperature below approx. -20 °C the same electrical circuit opens - how-
ever it closes again when the temperature rises.
If the measuring system is destroyed (i.e. if the expansion fluid emerges) the pressure in the diaphragm drops
and permanently opens the electrical circuit.
Safety temperature limiter
STB If the temperature on the temperature probe exceeds the switching point, the snap-action switch is activated,
the electrical circuit is opened or closed, and the snap-action switch is mechanically locked.
The unlocking difference depends on the control range. Exact values are available from the respective types.
They are also available upon request. If the temperature falls below the selected setpoint value (by the amount
of the unlocking difference) then the snap-action switch can be manually unlocked again.
If the probe has cooled down to a temperature below approx. -20 °C the electrical circuit opens - however it
closes again when the temperature rises.
If the measuring system is destroyed (i.e. if the expansion fluid emerges) the pressure in the diaphragm drops
and permanently opens the electrical circuit. Unlocking is no longer possible.
When the ambient temperature on the switching head and the capillary deviates — from the calibration ambi-
ent temperature of +22 °C — a switching point offset occurs. This switching point offset is reduced to a mini-
mum due to the temperature compensation.