Danfoss ST-1, ST-2 Data sheet
Data sheet
Safety thermostats
ST-1/ST-2
Application
ST-1 |
ST-2 |
Safety thermostats ST-1 and ST-2 can be used in directly or indirectly connected district heating systems where extra safety is required.
ST-1 incorporates a thermostat (TR) and a safety monitor (STW) with automatic reset.
ST-2 incorporates a thermostat (TR) with automatic reset and a safety limit cutout (STB) with manual reset.
If ST-1 or ST-2 is used together with an AMV(E) 13, 23, or 33 three-point controlled actuator, the safety monitor (STW) or safety limit cutout (STB) releases the spring return function for forced closure of the motorized control valve.
The safety thermostats are approved in accordance with DIN 3440 with the following
DIN Register Nos.: ST-1: TR STW 1175 05 ST-2: TR STB 1176 05
Ordering |
Type |
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Setting |
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Code no. |
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TR |
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STW |
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STB |
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ST-1 (TR/STW) |
30 - 120 oC |
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100 - 120 oC |
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- |
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087N1050 |
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ST-2 (TR/STB) |
30 - 90 oC |
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- |
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95 oC |
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087N1051 |
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Accessory |
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Sensor pocket (Cu/Ms) for ST1 / ST2 |
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087N1201 |
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Technical data |
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ST-1 |
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TR |
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STW |
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ST-2 |
TR |
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STB |
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Setting |
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30 - 120 oC |
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100 - 120 oC |
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Setting |
30 - 90 oC |
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95 oC |
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Differential |
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4 ± 1 K |
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12 ± 3 K |
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Differential |
4 ± 1 K |
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12 ± 3 K |
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Reset |
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Auto |
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Auto |
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Reset |
Auto |
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Manual |
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Contacts |
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Ag 1000/1000 |
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Contact loads |
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10 (2.5) A 250 V ~ / 7 A 380 V ~ |
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Max. ambient temperature |
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80 oC |
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Max. sensor temperature |
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130 oC |
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Cut-out accuracy |
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+0 K - -6 K |
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Enclosure |
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IP 40 |
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Mounting direction |
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No restrictions |
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Sensor connection |
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R ½ |
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Cable entry |
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M 20 |
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Pressure stage |
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PN 10 |
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Medium |
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Water, pH 7 - 10 |
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Sensor |
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2 off Ø 9 x 100 |
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Sensor pockets (takes both sensors) |
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Brass Ms 58/copper |
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Storage and transport temperature |
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-15 oC - +80 oC |
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Approvals |
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DIN 3440 and VDE 0631 |
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© Danfoss | 2022.02 |
AI000086465317en-010701 | 1 |
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Data sheet |
Safety thermostats ST-1/ST2 |
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Electrical connections
ST-1 with Danfoss ECL Comfort 210/310 and AMV(E) 13, 23, or 33 connected |
Dimensions
2 | © Danfoss | DCS-SGDPT/DK | 2022.02 |
AI000086465317en-010701 |
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