SIEMENS
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Siemens IC 10 · 2017
Relays
SIRIUS 3RS10, 3RS11, 3RS20, 3RS21 Temperature Monitoring Relays
Relays, digitally adjustable for 1 sensor
10
■
Overview
SIRIUS 3RS digital temperature monitoring relay for 1 sensor
The 3RS10, 3RS11, 3RS20 and 3RS21 temperature monitoring
relays can be used for measuring temperatures in solid, liquid
and gas media. The temperatures are acquired by means of
sensors in the medium, evaluated by the device and monitored
for overshoot, undershoot or location within a specified range
(window function). The 3RS10 and 3RS11 unit indicate the mea-
sured temperature in °C, the 3RS20 and 3RS21 unit in °F.
The units are also an excellent alternative to temperature control-
lers in the low-end performance range (two-or three-point con-
trol).
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Benefits
•
Very simple operation without complicated menu selections
•
Two- or three-point control can be parameterized quickly
•
All versions with removable terminals
•
All versions with screw or spring-type terminals
■
Application
The temperature monitoring relays can be used in almost any
application in which temperature overshoot or undershoot is not
permitted, e.g. in the monitoring of set temperature limits and the
output of alarm messages for:
•
Plant and environment protection
•
Temperature limits for process variables e.g. in the packaging
industry or electroplating
•
Temperature limits for district heating plants
•
Exhaust temperature monitoring
•
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
3RS1040,
3RS1042,
3RS2040
3RS1140,
3RS2140
3RS1142
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
Evaluation unit
Measuring accuracy at 20 °C ambient temperature
(T20)
<
2 K,
1 digit
<
5 K,
1 digit
<
7 K,
1 digit
Reference point accuracy
--
<
5 K
Deviations due to ambient temperature
In % of the measuring range
%
0.05 °C per K deviation from T20
Measuring cycle
ms
500
Hysteresis settings
for temperature
K
1 ... 99, 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)
Yes
Yes
Short-circuit detection
Yes
No
No
Three-wire conductor connection
Yes
2)
--
--
Enclosure
Rated insulation voltage
U
i
(pollution degree 3)
V AC
300
© Siemens AG 2016