Temperature limiter with LCD display STL50

programmableIP20SIL 2

Useful as Temperature Limiter/-Guard and Exhaust gas Temperature Limiter ●Certified according to DIN EN 14597 SIL 2 ●Inputs RTD Pt100 or double-thermocouple ●Alarm output 1 relay SPDT ●Programming via backlit LCD-graphic-Display The STL50 safety temperature limiter is used where ever thermal processes must be monitored and the system must be transferred into a safe operational state in case of fault. If the permissible temperature limit value is reached, or if a fault occurs within the permissible temperature range on the monitoring equipment (sensor open, sensor short-circuit, failure of a component part in the device, fault in the software, failure or inadmissible value of the supply voltage etc.), the STL50 switches off without delay. The alarm contact is activated, the LED ALARM on the front panel and the back-lighting of the display light up, and the error cause is indicated as plain text on the display. In addition, there is a 24 V DC signal present on the terminals 17-18 for an external alarm signal. Programming The device is programmable via front side buttons in connection with the graphic display. Operating modes The device can be used as: STB  Maximum- or minimum-monitoring with hold. Reset possible after omission of the fault with the external or internal button. ASTB  as before, but monitoring the exhaust gas temperature STW  Maximum- or minimum-monitoring without hold. Automatic reset after leaving the dangerous range Switching hysteresis always acts in the direction of safe range. The last fault is stored as plain text and can be called up in the working level and deleted.