SIEMENS
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Siemens IC 10 · 2017
Relays
SIRIUS 3RS10, 3RS11, 3RS20, 3RS21 Temperature Monitoring Relays
Relays, digitally adjustable for up to 3 sensors
10
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Overview
SIRIUS 3RS digital temperature monitoring relay for up to 3 sensors
The 3RS10, 3RS20 temperature monitoring relays can be used
for measuring temperatures in solid, liquid and gas media. The
temperature is detected by the sensor in the medium, evaluated
by the device and monitored for overshoot or undershoot or for
staying within an operating range (window function). The 3RS10
units indicate the measured temperature in °C, the 3RS20 units
in °F. The evaluation unit can evaluate up to 3 resistance sensors
at the same time and is specially designed for monitoring motor
windings and bearings.
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Benefits
•
Very simple operation without complicated menu selections
•
Space-saving with 45 mm width
•
Two- or three-point control can be parameterized quickly
•
All versions with removable terminals
•
All versions with screw or spring-type terminals
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Application
The 3RS10, 3RS20 temperature monitoring relays can be used
in almost any application in which several temperatures have to
be monitored simultaneously for overshoot or undershoot or
within a range.
Monitoring of set temperature limits and output of alarm
messages for:
•
Plant and environment protection
•
Temperature limits for process variables e.g. in the packaging
industry or electroplating
•
Controlling equipment and machines such as heating, climate
and ventilation systems, solar collectors, heat pumps or warm
water supplies
•
Motor, bearing and gear oil monitoring
•
Monitoring of coolants
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Technical specifications
1)
Not for NTC type B57227-K333-A1 (100 °C: 1.8 k
; 25 °C: 32.762 k
).
2)
Two-wire connection of resistance sensors with wire jumper between
T2 and T3.
Type
3RS1041,
3RS2041
Auxiliary circuit
Rated operational currents
I
e
• AC-15/24 ... 250 V
A
3
• DC-13 at
-
24 V
A
1
-
125 V
A
0.2
-
240 V
A
0.1
DIAZED fuse protection
• Operational class gG
A
4
Evaluation unit
Measuring accuracy at 20°C ambient temperature
(T20)
<
2 K,
1 digit
Deviations due to ambient temperature
In % of the measuring range
%
0.05 per K deviation from T20
Measuring cycle
ms
500
Hysteresis settings
for temperature 1
1 ... 99 K, for both values
Adjustable
delay time
s
0 ... 999
Sensor circuit
Typical sensor current
• PT100
mA
Typically 1
• PT1000/KTY83/KTY84/NTC
mA
Typically 0.2
Open-circuit detection
Yes
1)
Short-circuit detection
Yes
Three-wire conductor connection
Yes
2)
Enclosure
Rated insulation voltage
U
i
(pollution degree 3)
V AC
300
© Siemens AG 2016