Safety temperature limiter Type STR100
Safety Temperature Limiter for Pt100, SIL 2 according to IEC 61508
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Product description
The Safety Temperature Limiter type STR 100 is an electronic thermostat monitoring the temperature of heating equipment and machinery. When the permitted temperature-limit is exceeded or in case of a malfunction, the STR 100 switches off without delay. An active reset must be made for a restart. The temperature limit is adjustable with a scaled potentiometer. An unintended or unauthorized adjusting of the limit is prevented through a lead-sealed transparent cover.
With supply voltage switched on, the STR 100 operates in a changeable lockout mode and the relay must be started by a reset (manually with built-in reset button or external reset) to make contact (no) close. Applicable for plants with supervised operation. The mode of operation corresponds to type 2BJK according EN 60730/VDE 0631.
The temperature is measured with a Pt 100 resistance temperature detector (RTD) according to EN 60751 / IEC 751. The process qualification in combination with the sensor must be proved. To fulfil affords for higher safety functionality the function has to be routine-tested periodically. The thermostat series STR 100 meets safety category 3 (Safety of machines EN 954-1, TÜV Rheinland documents T 24/00 + T103 2007 Z1 + T103 2007 E2). If safety approval is recommended only use listed RTD.
Temperature Limiter
A temperature-limiter is an equipment that switches of permanently (locked) after the limit has been exceeded. A reset (manually or with a tool) is possible after the temperature has fallen below switch-back point (limit minus hysteresis).
Safety Temperature Limiter
A safety temperature limiter is a limiter that fulfils in addition the requirements of extended safety according to DIN 3440.
Technical Data
Rated supply voltage Us
AC 230 V
DC 24 V
Tolerance voltage
50 / 60 Hz
Power consumption
< 2 W
Internal fuse
T 0.16 A time-lag (or slow blow 0.25 A)
Sensor connection
2-wire Pt 100 RTD according EN 60751/IEC 751
α = 0.00385
Terminal current max.
< 3.15 mA
Terminal voltage max.
< 15 V open terminals
< 2 V with Pt 100 and highest temperature
Line compensation
0.5 Ώ normally
Release function
Temperature limit
Accuracy
Hysteresis
10 °C (±25 %)
Reset
internal reset button or contact (no) Y1, Y2
Temperature factor
0.2 K/10 °C
Relay output 11, 12, 14
Alarm
1 co contact, closed current circuit principle
Switching voltage
max. AC 400 V max. DC 300 V
Switching current
max. 6 A
Switching power (resistive load)
max. 2000 VA max.48 W at DC 24 V
Rated operational current Ie
2 A AC15 400V
2 A DC13 24 V
3 A AC15 230V
Recommended Fuse
4 A quick acting
Mechanical contact life
3 x 107 operations
Electrical contact life
1 x 105 operations with 230 V/6 A
Factor of reduction at cos. ϕ = 0.3
0.5
Relay output 21, 22
Alarm
1 nc contact, operating current principle
Switching characteristic minimum
12 V 10 mA AC/DC
* We recommend an RS-Suppressor to avoid high voltage spikes when a contactor is connected.
Reset push-button Y1, Y2
1 no, potential-free
Switching characteristic minimum
1 V 1 mA DC
Testing conditions (EN 50178, EN 61010-1, EN 60947-5)
Rated insulation voltage Ui
AC 250 V
Contamination level
2 (normal)
Rated impulse voltage
4000 V
Overvoltage category
III
EMC - Interference resistance
EN 61000-6-2, EN 61326
EMC - Interference transmission
class B, EN 61326
On period
100 %
max. ambient temperature
0...50 °C EN 600068-2-2 Dry Heat
Housing
Design
built-in type, pluggable
Material
Housing ....... PA 6.6
Socket ....... PA 6.6 GF25
Flame Class
UL 94 V-2
UL 94 HB
Dimensions (H x W x D)
82 x 42 x 121 mm
Line connection solid wire
1 x 2.5 mm2
Stranded wire with ferrules
1 x 1.5 mm2
Degree of protection (IP-Code)
Housing ....... IP 40
Socket....... IP 20
Fitting position
any
Mounting
35mm standard rail EN 60715 or with M4 screws
Vibration resistance
1 mm at 25 Hz
10 g at 25 …100 Hz
Shock resistance
10 g for 20 ms, 20 g for 4 ms
Weight
app. 300 g
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