The areas of application for (safety) temperature limiters or monitors ((S)TB or (S)TW) are to be found wherever thermal processes need to be monitored, and where the system must be set to a safe condition in the event of a fault. If the permitted temperature limit is reached or a fault occurs within the permitted temperature range (probe/cable break, short-circuit, component defect, power failure), then the instrument switches off without any delay. If the fault is no longer present, then limiters TB and STB must be reset manu­ally. This can be done by means of a reset pushbutton on the instrument, or by an external pushbutton. The flow of energy is only enabled again when the temperature is lower (O-function) or higher (S-function) than the preset temperature limit by the amount of the switching differential. In the event of a short-term supply failure (not exceeding 1min) in the satisfactory range of the system, the instrument will be automatically enabled after the power has been restored. The size of the switching differential is 3 °C, 10°C, 30°C or 100°C. The analog setpoint knob for the limit temperature is mounted on the front panel. An un­intentional or unauthorized adjustment of the limit setting is prevented by a clear cover which can be lead-sealed. The instruments are intended for use as built-in units for fixing onto standard rails to EN 50022-35. The screw terminals for the electrical connections (for a conductor cross-section of max. 2.5mm2) are on one wiring level. The instruments function over defined temperature ranges between 0 and 1800 °C (with extra code “SIL” and “DIN”: 0 to 1400 °C).

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MM-69935-00	TB/TS温度控制器		/()

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