STB 55 limiter

Certified stop SIL 2, DIN EN 14597 (interchangeable for DIN 3440). Intended for safety systems in thermal processes requiring certification, e.g. boilers, reactors.

It can be used as: temperature safety limiter (STB) – after exceeding min / max, a manual reset must be carried out, temperature limiter (ASTB) – operation as above, monitoring (STW) – outputs on / off, depending on the process value.

Basic technical data of STB55:

• EN 61508 SIL 2 certification
• programming limits and hysteresis
• Pt 100 input 3-wire or double J, K, N and S thermocouple
• error 0.5%, ± 2 digits
• reaction time 0.5s
• 4 programming buttons
• password
• 1 SPDT relay – alarm output
• memory
• top-hat DIN
• display

Benefits and features of STB 55:

• Rail Mounted (100 x 50 mm), 110 mm depth
• Graphic-LCD-display, with white LCD-backlight
• Safety Limit alarm plus separate warning
• Memory function for error message

Safety sensors cooperating with STB 55: Sensor SIL