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Monitoring Relays

3UG Monitoring Relays for Electrical and Additional Measurements

Level monitoring

7/82

Siemens LV 1 T · 2006

■Overview

The 3UG35 01 level monitoring relay is used together with the

2- or 3-pole sensors to monitor the levels of conductive liquids.

■Function

The principle of operation is based on measuring the electrical

resistance of the liquid between two immersion sensors and a

reference terminal. If the measured value is lower than the

sensitivity set at the front, the output relay changes its switching

state. In order to exclude electrolytic phenomena in the liquid,

the sensors are supplied with alternating current.

Two-level control: the output relay changes its switching state as

soon as the liquid level reaches the maximum sensor, while the

minimum sensor is submerged. The relay returns to its original

switching state as soon as the minimum sensor no longer has

contact with the liquid.

For safe resetting, the supply voltage must be interrupted for

at least 0.5 s (T3).

The delay times T1 and T2 of the output relay have not been

included in the diagram in order to enhance clarity.

Note:

It is also possible to connect other resistance sensors to the Min

and Max terminals in the range 5 to 100 k

W, e.g. photoresistors,

temperature sensors, encoders based on resistance etc.

The monitoring relay can therefore also be used for other

applications apart from monitoring the levels of liquids.

N S B 0 _ 0 0 9 6 1

A 1 / A 2

T 3

) D e t e r m i n e d b y t h e a r r a n g e m e n t

o f t h e p r o b e s i n t h e m o n i t o r e d l i q u i d .

M a x i m u m l e v e l )

M i n i m u m l e v e l )

M o n i t o r e d l e v e l

O u t p u t r e l a y

F u n c t i o n O V E R

O u t p u t r e l a y

F u n c t i o n U N D E R

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