Item No. 1102-1012-2102-030
EAN 4 251325 618746

Electronic frost protection thermostat/ frost monitor THERMASREG® FS-20 with switching relayoutput, continuous temperature and valve output (summation output 0–10V) and control and cascading output (0–10V), optionally with connection for heating element, in an impactresistant plastic housing with quick-locking screws, with display by default, with fully active sensorrod made from copper.

The frost monitor is used to monitor air conditioning systems, heat exchangers, heating registers and similar systems, and protects against frost damage and freezing. Falling below the limit value is detected at the coldest measuring point of the capillary tube, the sensor rod is active along its entire length. Uses internal diagnostics to detect capillary breakage, power failure or electric damage to the sensor as an error and the relay automatically switches to frost.

The innovative 2-phase frost protection thermostat enables simple combination of several devices (cascading) for demand-oriented, comprehensive frost monitoring. The delivery scope includes the mounting clamps MK-05-K for expert attachment of the sensor rod.

215,94 € net
Voltage supply 24 V AC/ DC (± 10 %)
Load resistance RL > 50 kOhm
Switch-on ⁄ start-up time < 1 min
Response time t90 < 5 s
Input 1 x 0 -10 V control input DDC
1 x 0 -10 V ascading input
Output 1 x 0 -10 V output temperature (corresponding to 0...+15 °C)
1 x 0 -10 V output valve
(frost signal with control voltage and cascading)
1 x potential-free changeover contact (24 V),
range of adjustment 0...+15 °C
Measuring range 0...+15 °C
Accuracy typically ± 1 K (at +10 °C)
Ambient temperatures Sensor and capillary tube: –20...+60 °C
(capillary tube at a distance of > 20 cm from the housing)
Housing: –15...+50 °C
Storage/ transport: –30...+70 °C
Process connection by mounting clamps MK- 05 - K
(included in the scope of delivery)
Electrical connection 0.14 - 1.5 mm² via terminal screws
Housing plastic, UV-stabilised,
material polyamide, 30 % glass-globe reinforced,
with quick-locking screws
(slotted/ Phillips head - combination),
colour traffic white (similar to RAL 9016),
housing cover for display is transparent !
Housing dimensions 126 x 90 x 50 mm (Tyr 2)
Cable gland M 16 x 1.5, including strain relief, exchangeable,
max. inner diameter 10.4 mm
Sensor and capillary Copper sensor rod, length of 3 m or 6 m,
active along the entire sensor length,
min. response length of 25 cm
Hysteresis of switching step 2K
Permissible air humidity < 95 % r. H., non-precipitating air
Protection class III (according to EN 60 730)
Protection type IP 65 (according to EN 60 529)
Standards CE conformity,
electromagnetic compatibility according to EN 61326,
according to EMC Directive 2014/ 30/ EU
Features display with illumination, three-line, cutout approx. 70 x 40 mm
(W x H), for displaying the actual temperature, measuring
range overrange/underrange of the set switch point (frost
protection temperature), and alarm indicator for "frost" or
"error" (capillary breakage, overvoltage/undervoltage)
Internal diagnostics Error 1 in case of cable / capillary breakage
Error 2 in case of undervoltage / overvoltage
(relay automatically switches to frost)
Type Item No. Price
KRD-04 Capillary tube gland bracket Capillary tube gland bracket for FST and MWTF/MWTM for installation in ducts / sheet metal walls 7100-0030-7000-000 7,86 €
MK-05-K Mounting brackets, plastic Plastic mounting brackets 7100-0034-1000-000 8,71 €
WS-03 Weather and sun protection Weather and sun protection 7100-0040-6000-000 39,45 €