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General conditions of export
STB 55

STB 55

Safety temperature limiter

  • Certified to DIN EN 14597 (replaces DIN 3440)
  • SIL 2
  • Can be used as:
  • - Safety temperature limiters (STB)
  • -Waste gas temperature limiters (ASTB)
  • - Safety temperaturemonitors (STW).

The safety temperature limiter STB 55 is
used wherever thermal processes need
to be monitored, and the plant switched
into a safe condition in case of a fault.
If the permissible temperature limit is
reached or if a fault occurs in the
monitoring equipment within the
permissible temperature range (sensor
break or short circuit, failure of a
component within the device, fault in
the software, failure or impermissible
value of the supply voltage, etc.), the
STB 55 switches off immediately.
The alarm contact is activated, the
“ALARM” LED in the front panel and
the background lighting of the display
light up, and the cause of the alarm
appears in the display in plain text.
In addition, a 24 VDC signal for external
alarm signalling is available at terminals

Main attributes
Certified to EN 61508 SIL2
Input from Pt 100 in 3-wire connection, or dual thermocouples type J, K, N and S
Programmable temperature limit and switching hysteresis
Basic error <0,5 %, ±2 digits
Response time 0,5s
1 SPDT relay for alarm output
Memory function for error signalling
Operator lock (password protection)
Clips onto top-hat DIN rail
Convenient 4-key operation

further informations on request