TECHNICAL FEATURES AND REGULATIONS SP1 Triggering value. Range of setting: see “how to order”. SP2 Reset value Range of setting: see “how to order”. SP2 value must be always lower than SP1. RESET (on request) By means of the push button on the front or by short closing a contact between pin 1 and 2. This function is used to reset the device also when the temperature is higher than SP2. When the temperature is below SP2, the device resets in any case. LED L1 (Red) It lights on when SP1 is overcome. LED L2 (Green) It lights on when the temperature is lower than SP2. LED A (Red) It lights on when the temperature overcomes SP1 and it goes off when the temperature goes below SP2. RELAY A It goes OFF when T overcomes SP 1 and it returns ON when the temperature returns below SP2. LED S=0 S=(red) - When the sensor detects a value lower than 70 ohm (equivalent to -75°C), the device detects the short-circuit condition; the LED S=0/lights on and the relay goes OFF. - When the sensor detects a value higher than 170 ohm (equivalent to 185°C) the device detects the “open sensor condition, the LED S=0/lights on and the relay is OFF LED ON (yellow) Led showing supply on. LED E (red) Flashes when SP2 is set at a value higher than di SP1 (wrong setting). INSTALLATION and CONNECTIONS Connections to be made according to fig. 1. (Wiring to an electrical board with a differential relay and a sectionalizing switch). The length of every wiring must be less than 30m. INPUTS Pin 3-4 for Pt 100 sensor (for example E 089 Ø 5x60 mm, 1 m. cable). Pin 1-2 RESET for free of voltage contact (when available) (Vmax: 12Vdc, I= 1mA). RANGES See Tab A. On request the device CT 03N can be supplied in the execution with one set point min or max and with a fixed full scale, without adjustable setting. OUTPUTS Relay 10A - 230Vac - resistive load 15-14 NC Condition of not 15-16 NO supplied relay SUPPLY AC 2VA - 50-60Hz - Tolerance: ±10% Pin 11-13: 230Vac, 115 Vac or 24 Vac. INSULATION Galvanic separation it is given by the supply transformer. SUPPLY 24 VDC 2W - Tolerance: ±10% Pin 13 +; Pin 11 –. INSULATION Nobody. Pin 13 is connected internally to the pins 2 and 3 (see Fig. 1b). DIMENSIONS 45x75x115 mm for DIN rail Accessory available on request: E 405D plexiglass transparent cover, fitted for tight closure. IP protection class 40. WORKING TEMPEATURE: -20°C÷+70°C WEIGHT: kg 0,200 COLOUR: grey

FUNCTION The device detects the temperature by means of a Pt 100 sensor. USE The device, by means of an external Pt 100 sensor, controls a temperature (an ambient, an oven …etc…). The set point SP1 is considered an “ALARM”; the set point SP2 is considered a “RESET” (see Fig. 2).

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