Description
Fischer TW85 – Explosion proof, intrinsically safe resistance thermometer
Resistance thermometer for explosion proof hazardous area Zone 0, 1, 2 (gas, dust), suitable for all media air and liquid, vibration resistant
Make: Fischer Messtechnik (Germany)
Model: TW85
Fischer TW85, resistance type thermometer is an intrinsically safe instrument for measuring temperature in fluids and gaseous as well as dusts. This thermometer consists of a protective sleeve with various process connections, a terminal head and – depending on model – an exchangeable gauge slide. All components in touch with process media are leak tested. Pt100 temperature sensors to DIN EN 60751 in tolerance classes A or B in 2, 3 or 4-wire circuit are used inside the protective sleeve.
Models with 2 measuring circuits are possible. To transfer measurement as standard signal (eg. 4~20mA) a transmitter can be integrated into the terminal head.
These resistance thermometers meet demands of equipment – group II categories 1/2 G and 1/2 D and / or 2G and 2D. They are suitable for usage in explosion hazardous areas zone 1 (gas) and Zone 21 (dust). The protective sleeve may extend into Zone 0, resp 20 if the wall thickness is > 1mm (separation of zones).
These resistance thermometers with intrinsic safety Ex ‘i’ are certified for electrical connection to intrinsically safe circuits category ib (usage for Zone 1 and 2, with separative element in zone 0) as well as category ia (for usage of sensing probe in zone 0, 1 and 2)
Conformity of Norms:
Fischer TW85 resistance thermometer confirms to:
- EN 50014 2002 +A1+A2 1999
- EN 50020 2002
- EN 50281-1-1 1998
- EN 50284 1999
- EN 1127-1 1997
Directive TW85
- Ex II 1 / 2 G EEx ia IIC T6
- Ex II 1 / 2 D IP65 Tx °C
Key Specifications:
- Measuring element:
- gauge slide acc. to DIN 43762,
- insertion tube stainless steel 1.4571,
- resistance 1 or 2 Pt100 acc. to DIN EN 60751
- Protective sleeve:
- SD 1/ SD 2/ SD 7 like DIN 46763 form D,
- Material 1.4571
- Insertion tube: dia 11mm, 165 mm long,
- material 1.4571
- Connection: terminal head type BUZ / BUZH IP65 EN 60529
- Max. media temperature: 450°C
Application / Industry:
- Chemical process industries
- Petrochemicals
- Marine, shipping, ship building
- Water, effluent treatment system
