1. General information
Bartec BSTW II temperature monitor is a ON/OFF thermostats 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.
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 micro switch. 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.
2. Specification of BSTW temperature monitors
Technical data | |
Protection class | IP 65/EN 60529 |
Min. ambient temperature | -55 °C (Standard) |
Max. ambient temperature | depends on the type of heating cable connection |
Storage temperature | -55 °C to +65 °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: 6 mm Sensor material: SS 1.4571 |
Contacts 1 SPDT | Contact decks 1 to 2: AC 400 V/16 A, AC 230 V/25 A Contact decks 1 to 4: AC 400 V/6.3 A, AC 230 V/6.3 A |
Switching hysteresis | depending on type, see ordering informations |
Switching accuracy | depending on type, see ordering informations |
Explosion protection | |
Marking | II 2G Ex de IIC T6, T5, T4, T3 |
Certification | EPS 11 ATEX 1356 X |
3. Order code selection table
Device for 1 heating circuit | ||||
Description | Switching temperature | Switching point deviation | Hysteresis | Order no. |
BSTW II | -20 °C to +50 °C | +5 K/-0 K | 5K | 27-6DF2-5232/1200 |
+0 °C to +190 °C | +16 K/-0 K | 14K | 27-6DF2-5232/1C00 | |
+60 °C to +300 °C | +36 K/-0 K | 17K | 27-6DF2-5232/1G00 | |
BTB II | +70 °C to +190 °C | +0 K/-16 K | 14K | 27-6DJ2-5232/1D00 |
+150 °C to +300 °C | +0 K/-36 K | 17K | 27-6DJ2-5232/1J00 | |
Device for 3 heating circuit | ||||
Description | Switching temperature | Switching point deviation | Hysteresis | Order no. |
BSTW II | -20 °C to +50 °C | +5 K/-0 K | 5K | 27-6DF2-5243/1200 |
+0 °C to +190 °C | +16 K/-0 K | 14K | 27-6DF2-5243/1C00 | |
+60 °C to +300 °C | +36 K/-0 K | 17K | 27-6DF2-5243/1GG0 | |
Combination unit | ||||
Description | Switching temperature | Switching point deviation | Hysteresis | Order no. |
BSTW II/BTB II | -20 °C to +50 °C | +5 K/-0 K | 5K | 27-6DU2-5242/1220 |
+0 K/-5 K | 5K | |||
0 °C to +190 °C | +16 K/-0 K | 14K | 27-6DU2-5242/1CD0 | |
+70 °C to +190 °C | +0 K/-16 K | 14K | ||
+60 °C to +300 °C | +36 K/-0 K | 17K | 27-6DU2-5242/1GJ0 | |
+150 °C to +300 °C | +0 K/-36 K | |||
-20 °C to +50 °C | +5 K/-0 K | 5K | 27-6DU2-5242/12J0 | |
+150 °C to +300 °C | +0 K/-36 K | 17K | ||
0 °C to +190 °C | +16 K/-0 K | 14K | 27-6DU2-5242/1CJ0 | |
+150 °C to +300 °C | +0 K/-36 K | 17K | ||
BSTW II/BSTW II | -20 °C to +50 °C | each +5 K/-0 K | 5K | 27-6DT2-5242/1220 |
0 °C to +190 °C | each +16 K/-0 K | 14K | 27-6DT2-5242/1CC0 | |
