JUMO 60.4514 Hot air thermostats, WTHc Data Sheet - Manual

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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
Hot Air Thermostats
WTHc series
Special features
• With microswitch
• Device combination consisting of 3 individual devices
• Protection class IP 40 or IP 54
• Tested according to DIN EN 14597
Brief description
Thermostats are used to control and monitor thermal processes.
The thermostats of the WTHc series are suitable for the use in hot air systems acc. to DIN 4794
and consist of 3 separate measuring and switching systems with the following functions: tem--
perature controller TR, temperature monitor TW, and safety temperature limiter STB.
In the event of a malfunction, the STB switches the monitored machine line to an operational
safe status.
Hot air thermostats operate according to the fluid expansion principle. The electrical switching
elements are microswitches.
WTHc-2280
WTHc-2280-SW
Approval/approval marks (see "Technical data")
Switching function
Temperature controller TR and temperature monitor TW
If the temperature on the temperature probe exceeds the setpoint value, the microswitch is ac-
tivated by the transmission mechanics and the electrical circuit is opened or closed. If the tem-
perature falls below the selected setpoint value (by the amount of the switching differential), the
microswitch is reset to its initial position.
Temperature monitor TW and safety temperature limiter STB
The microswitch can be manually unlocked once the dangerous temperature drops by approx.
10 K. The microswitch can be manually unlocked once the dangerous temperature drops by ap-
prox. 10 K.
Self-monitoring for the safety temperature limiter STB
If the measuring system is destroyed (i.e. if the expansion fluid escapes) the pressure in the
membrane of the STB drops and permanently opens the electrical circuit. Unlocking is then no
longer possible. If the probe has cooled down to a temperature below approx. -20 °C the elec-
trical circuit opens
− however it automatically closes again when the temperature rises.
Data Sheet 604514
2013-06-20/00332482