3UG3501 datasheet(88/114 Pages) ETC2

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Monitoring Relays

3RS10, 3RS11 Temperature Monitoring Relays

General data

7/88

Siemens LV 1 T · 2006

Connection of thermocouples

Based on the thermo-electrical effect, a differential temperature

measurement will be performed between the measuring point

and the signal evaluator.

This principle assumes that the signal evaluator knows the

temperature at the clamping point (T2). For this reason, the

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

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 detection is therefore possible (T1) without needing

to know the precise ambient temperature of the clamping point

at the signal evaluator (T2).

The connecting cable is only permitted to be extended using

connecting leads that are made from the same material as the

thermocouple. If a different type of conductor is used, an error

will result in the measurement.

You can find more information on the Internet at:

http://www.feldgeraete.de/76/produkte/fuw.html

http://www.ephy-mess.de

or from

EPHY-MESS GmbH (see Appendix, External Partners)

■Function

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

delay can only be adjusted with digital units (on analog units,

t = 0).

The relays return to their original state as soon as the

temperature reaches the set hysteresis value.

Temperature overshoot

Closed-circuit principle

Temperature undershoot

Closed-circuit principle

N S B 0 _ 0 1 3 2 5 a

T 1

T 2

N i

N i C r

M e a s u r i n g p o i n t

I n t e r n a l

r e f e r e n c e p o i n t c o m p e n s a t i o n

NSB01327c

NSB01329b

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