BSTW II Safety temperature monitor and BTB II limiter

25 A, fail-safe

27-6D.2-52../...0

Features

  • Direct connection of self-limiting heating tapes by means of BARTEC’s cold-applied technology reduces wiring and materials
  • Switching voltage up to 400 V and 2 M20 x 1.5 boreholes as standard for an enhanced operation of EKL heating circuits
  • Safety cut-out temperature -45 °C or -55 °C for reliable operation, even in very cold conditions
  • Minimum operating temperature
    -55 °C for all standard variants for use all over the world without restrictions
  • Wide regulating range from -20 °C to +500 °C, depending on the switch insert

Marking

Ex II 2 G Ex de IIC T6, T5, T4, T3

Ambient temperature

Min.: -55 °C (Standard)
Max.: see data sheet

Certification

EPS 11 ATEX 1356 X
TC RU C-DE.GB06.B.00399

Description

BSTW II 25-A Ex temperature monitors and BTB II/BSTB II temperature limiters are two-state controllers in Ex e-certified polyester enclosures. In addition to the use of conventional wiring by means of a sheathed cable, the BSTW II and BTB II/BSTW II are suitable and approved for the direct connection of self-limiting BARTEC heating systems in the enclosure. As a result, a verification of thermal safety and a further acceptance test by a capable person is no longer necessary. The benefit for the customer is obvious. The direct connection of self-limiting heating tapes does away with the need for junction boxes and considerably reduces the extent of wiring required. BSTW II and BTB II/BSTB II can monitor the ambient temperature but also the different surface temperatures. In conformance to EN 60079-30-1, the BTB II and BSTB II fail-safe temperature limiters are designed to switch off and remain switched off when the preset limit temperature is reached. The restart lockout requires manual resetting directly in the device.

Function

Any change in temperature in the sensor causes a change in the volume in the liquid-filled measuring system, which in turn results in a movement of the diaphragm membrane, which is connected to a transmission mechanism, and this opens a microswitch. If the sensor temperature exceeds the set value, the contacts 1 and 2 remain continuously open. The contacts in the BTB II/BSTB II remain continuously open until there is a manual intervention.

BSTW II

fail-safe safety temperature monitor

  • Falling calibration to maintain the temperature during the process
  • Turns on and off automatically whenever the temperature exceeds or drops below the setpoint value

BTB II

fail-safe temperature limiter

  • Rising calibration to limit temperature during the process
  • switches off and remains switched off once the limit temperatures are reached

Technical data *

Protection class IP 65/EN 60529
Structure Contacts: 1 change-over contact
Contact decks 1 – 2: AC 400 V/16 A, AC 230 V/25 A
Contact decks 1 – 4: AC 400 V/6.3 A, AC 230 V/6.3 A
Dimensions Device for 1 heating circuit: 160 mm x 160 mm x 90 mm
Device for 1 to 3 heating circuits: 260 mm x 160 mm x 90 mm
Combination unit: 260 mm x 160 mm x 90 mm
Double unit: 260 mm x 160 mm x 90 mm
Capillary tube
Length: 1000 mm; OD sensor line: 1,5 mm;
Min. bend radius 5 mm; Sensor bulb diameter: 6 mm
Material Sensor material: SS 1.4571
Storage temperature -55 °C to +65 °C
Connection Device for 1 heating circuit
Terminals: 4 x 6 mm² + 2 PE
Heating cable connections: 2 x M20, closed with blind plug
Device for 1 to 3 heating circuits
Terminals: 8 x 6 mm² + 3 PE
Heating cable connections: 3 x M20, closed with blind plug
Combination unit
Terminals: 6 x 6 mm² + 3 PE
Heating cable connections: 2 x M20, closed with blind plug
Double unit
Terminals: 8 x 6 mm² +3 PE
Heating cable connections: 2 x M20, closed with blind plug

*Refer to the documentation for more detailed information


Documentation

Data Sheet - BSTW II Safety temperature monitor and BTB II limiter

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