Datasheet

V2.00/EN/00415410
Data Sheet 602031 Page 2/10
JUMO GmbH & Co. KG
Delivery address: Mackenrodtstraße 14
36039 Fulda, Germany
Postal address: 36035 Fulda, Germany
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Internet: www.jumo.net
JUMO Instrument Co. Ltd.
JUMO House
Temple Bank, Riverway
Harlow, Essex CM20 2DY, UK
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Internet: www.jumo.co.uk
JUMO Process Control, Inc.
6733 Myers Road
East Syracuse, NY 13057, USA
Phone: [phone]
1-800-554-5866
Fax: [phone]
Email: [e-mail]
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 posi-
tion.
Safety temperature monitor
STW (STB)
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.
The electrical circuit 1-2 opens when the probe of STW (STB) and STB cools down to the negative tempera-
ture range, but it closes again automatically if 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 with restart lock and
self-monitoring
If the temperature on the temperature probe exceeds the switching point, the snap-action switch is activated,
the electrical circuit is opened, and the snap-action switch is mechanically locked.
The unlocking difference depends on the control range. Precise values can be attained from the respective
device type. They are also available upon request.
The electrical circuit 1-2 opens when the probe of STW (STB) and STB cools down to the negative tempera-
ture range, but it closes again automatically if 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.