STW Capillary Tube Thermostat5 A, Fail-safe
27-6154-11.5
Features
- Extremely compact
- Different temperature range combinations available in one enclosure
- Suitable for use in Zone 1 areas
- Temperature can be set in Zone 1 areas
- Alternative versions available
Certificates
NEPSI GYJ11.1611
GOST R POCC DE.ME92.B02734
GOSPROMNADZOR 11-02-0015-2012
Ex protection type
Ambient temperature
see datasheet
Description
The 5 A capillary tube thermostat, STW, is a compact change-over controller housed in an EEx e certified polyester enclosure.Heaters, fans, motors and other equipment are energised and de-energised 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.
Function
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 microswitch. 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 autocontrol opens the circuit but closes again on temperature rise.
Technical data (extract)
(Click here for more information)Protection class | IP 65 (EN 60592) |
Dimensions | single unit 110 x 75 x 55 mm single unit, special size 122 x 120 x 90 mm double unit 220 x 120 x 90 mm Capillary tube: 1000 mm length OD sensor line 1.5 mm min. bend radius 5 mm sensor bulb diameter 6 mm |
Material | Enclosure: polyester sensor material: stainless steel S/S 1.4571 |
Storage temperature | min. -40 ?C |
Weight | single unit 550 g |
Temperature range | -20 ?C to +300 ?C (mechanical) |
Voltage | AC 250 V/50 Hz |
Current | 5 A (swiched current) |
Connection | 3 Terminals 2.5 mm? + 1 PE Cable glands:1 x M20, cable diameter 6 to 12 mm |