3UG4622-1AW30 Datasheet, PDF (88/114 Pages) List of Unclassifed Manufacturers – Monitoring and Control Devices

Monitoring Relays
3RS10, 3RS11 Temperature Monitoring Relays
General data
Connection of thermocouples
■ Function
Based on the thermo-electrical effect, a differential temperature
measurement will be performed between the measuring point
and the signal evaluator.
Once the temperature has reached the set threshold J1, the
output relay K1 changes its output state as soon as the set time
t has elapsed (K2 responds in the same manner to J2). The time
This principle assumes that the signal evaluator knows the
delay can only be adjusted with digital units (on analog units,
temperature at the clamping point (T2). For this reason, the
t = 0).
3RS11 temperature monitoring relay has an integral compen-
sator that determines this comparison temperature and builds it
into the result of the measurement. Therefore, the thermal
The relays return to their original state as soon as the
temperature reaches the set hysteresis value.
sensors and cables must be insulated.
The absolute temperature is calculated from the ambient
temperature of the signal evaluator and the temperature
difference measured by the thermocouple.
Temperature overshoot
Closed-circuit principle
Temperature detection is therefore possible (T1) without needing
to know the precise ambient temperature of the clamping point ^J1
at the signal evaluator (T2).
J2
The connecting cable is only permitted to be extended using
connecting leads that are made from the same material as the _Us
thermocouple. If a different type of conductor is used, an error
will result in the measurement.
K1
K2
N iC r
t
t
NSB01327c
t
T1
T2
Ni
M e a s u r in g p o in t
N S B 0_01325a
In te rn a l
r e fe r e n c e p o in t c o m p e n s a tio n
Temperature undershoot
Closed-circuit principle
NSB01329b
J1
J2
You can find more information on the Internet at:
http://www.feldgeraete.de/76/produkte/fuw.html
http://www.ephy-mess.de
Us
K1
t
K2
t
t
or from
EPHY-MESS GmbH (see Appendix, External Partners)
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Siemens LV 1 T · 2006