1. General information
Bartec STW II thermostat is a compact ON/OFF type capillary tube thermostat, housed in an Ex e certified polyester enclosure, Heaters, fans, motors and other equipment are energized and de-energized by means of this thermostat when specific temperature ranges are exceeded. This device can also be used to control the temperature in air or on various surfaces. It with small construction varying temperature ranges can be combined in one enclosure. STW II can be mounted directly in Zone1 and temperature can be set in Zone1 with many variants available.
Any change in temperature at the sensor bulb causes a change in the volume of fluid in the measuring system, which in turn results in a movement of the diaphragm membrane. This membrane is connected to a mechanical device that activates a micro switch. If the temperature at the sensor bulb exceeds the pre-set value, terminals 1 and 4 are opened. If there is a rupture or break in the sensor tube (leakage), then the switch remains permanently open (fail-safe). If the temperature falls below the minimum setting, the auto control opens the circuit but closes again on temperature rise.
2. Specification of STW II Capillary Tube Thermostat
Technical data | |
Protection class | IP 65/EN 60529 |
Enclosure material | polyester |
Ambient temperature | -55 °C to +50 °C |
Capillary tube | length: 1000 mm, up to 5000 mm on request OD sensor line: 1.5 mm min. bend radius: 5 mm Sensor bulb diameter: 4 to 6 mm Sensor material: stainless steel SS 1.4571 |
Dimensions (L x W x H) | 120 mm x 122 mm x 90 mm |
Weight | approx. 400 g |
Terminals | 4 x 2.5 mm2 + 1 PE |
Heating cable connections | 1 x M25 |
Explosion protection | |
Marking | II 2G Ex de IIC T6, T5 |
Certification | EPS 11 ATEX 1356 X |
Electrical data | |
Switching current at 230 V | open contact 16 A (AC-1) closed contact 2.5 A (AC-1) |
Minimum contact load | AC/DC 24 V, 100 mA |
Switching hysteresis | depending on type, ordering information |
Switching accuracy | depending on type, ordering information |
3. Order code selection table
Description | Switching temperature | Switching accuracy | Hysteresis | Order no. |
STW II | -20 °C to +50 °C | +5 K/-0 K | 5K | 27-6DF2-5215/1200 |
+0 °C to +190 °C | +16 K/-0 K | 14K | 27-6DF2-5215/1C00 | |
+60 °C to +300 °C | +36 K/-0 K | 17K | 27-6DF2-5215/1G00 |
