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| Technical data Body Diecast aluminium with plastic cover. Immersion tube Brass G 1/2", included with product Stainless steel G 1/2", order separately. Type T4NST or T5NST, see Product Summary Permitted ambient +80°C at the switching temperature head Switching point (in upper third of scale) accuracy for STW, STB: ± 5 % for TR: ± 1.5 % (in % of scale range) Switching (in % of scale range) differential for STW, STB: 4–6% Lead seal The cover of the switching device can be lead sealed so that the internal settings of the limiter switching points are no longer accessible after sealing. Switching 10 (2) A, 250 VAC capacity Degree of IP 54 protection STW1, TWP1 STB1 Connection schemes: 2 4 1 STW, TWP 2 1 Immersion wells, stainless steel, 1.4571, G1/2", ø 8 mm Dimensioned drawings (mm) STB 150 Type STW1 TWP1 STB1 Function Safety temperature monitor Temperature Monitor Safety temperature limiter Setting range 20 to 150 °C 20 to 150 °C 60 to 130 °C Setting internal internal internal Controls accesible from outside no no Reclosing button Contact changeover changeover opener contact Reclosing lockout (internal) no no yes Max. temperature at sensor 175 °C 175 °C 150 °C Immersion depth 150 mm 100 mm 150 mm Permitted pressure, brass immersion tube 40 bar 40 bar 40 bar Permitted pressure, stainless steel, immersion tube 80 bar, T4NST 80 bar, T4NST (150 mm) 80 bar, T4NST |
| Technical data Body Diecast aluminium with plastic cover. Immersion tube Brass G 1/2", included with product Stainless steel G 1/2", order separately. Type T5NST, see Product Summary Permitted ambient +80°C at the switching temperature head Switching point (in upper third of scale) accuracy for TW, STW, STB: ± 5 % for TR: ± 1.5 % (in % of scale range) Switching (in % of scale range) differential for TR, TW: 3–4 % for STW, STB: 4–6% Lead seal The cover of the switching device can be lead sealed so that the internal settings of the limiter switching points are no longer accessible after sealing. Switching 10 (2) A, 250 VAC capacity Degree of IP 54 protection STW+TR STB+TR Connection schemes: In devices with a dual function there are 2 switching elements. Pay attention to the function of the relevant switch when connecting. 2 4 1 STW, TR, TW STB 2 1 Immersion wells, stainless steel 1.4571, G1/2", Ø 15mm Dimensioned drawings (mm) Type STW+TR STB+TW STB+TR Function Safety temperature monitor and controller Safety temperature limiter and monitor Safety temperature limiter and monitor Setting range 20 to 150 °C 30 to 110 °C 30 to 110 °C Setting STW internal TR external STB internal TW internal STB internal TR external Controls accesible from outside Setting wheel for TR Reclosing button Reclosing button and setting wheel for TR Contact 2 x changeover NC (STB) and changeover (TW) NC (STB) and changeover (TR) Reclosing lockout (internal) no yes yes Max. temperature at sensor 175 °C 130 °C 130 °C Immersion depth 150 mm 150 mm 150 mm Permitted pressure, brass immersion tube 25 bar 25 bar 25 bar Permitted pressure, stainless steel immersion tube 40 bar T5NST 40 bar T5NST 40 bar T5NST |
| General notes on temperature measurement with resistance sensors Pt 100 and Pt 1000 Platinum temperature sensors Pt 100 or Pt 1000 make use of the constant change in resistance of materials at changing temperatures. A platinum-rhodium alloy specially suited to this purpose is normally used because of its good stability and high reproducibility. The resistance of the sensor increases as the temperature rises. The resistance values are stipulated in DIN IEC 751 as follows: Pt 100 = 100 ohms at 0°C Pt 1000 = 1000 ohms at 0°C The resistance values for all temperatures are quoted in the above-mentioned standard. The resistance sensors are divided into accuracy classes according to their limiting error. For FEMA Pt 100/1000 sensors, Class A applies: 0.15 K + 0.002 x t* *t is the numerical value of the temperature in °C (disregarding the sign) Resistance values of Pt 100 sensors (except from DIN 43 760, IEC 751 |
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