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

German English PTB 01 ATEX 1114
English Chinese NEPSI GYJ11.1611
Russian GOST R POCC DE.ME92.B02734
Byelorussian GOSPROMNADZOR 11-02-0015-2012

Ex protection type

Ex II 2G Ex ed IIC T6

Ambient temperature

-20 °C bis +50 °C
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 classIP 65 (EN 60592)
Dimensionssingle 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
MaterialEnclosure: polyester
sensor material: stainless steel S/S 1.4571
Storage temperaturemin. -40 ?C
Weightsingle unit 550 g
Temperature range-20 ?C to +300 ?C (mechanical)
VoltageAC 250 V/50 Hz
Current5 A (swiched current)
Connection3 Terminals 2.5 mm? + 1 PE
Cable glands:1 x M20, cable diameter 6 to 12 mm

Documentation

Data Sheet - STW Capillary Tube Thermostat German English French Russian