5
2 Product description
The STL4896 safety temperature limiter is used wherever thermal processes must
be monitored and the system must be switched to a safe operating state in case of
a fault. If the permissible temperature limit value is reached or an error occurs in
the monitoring device (probe break, probe short-circuit, failure of a component in
the device, error in the software, failure or impermissible value of the supply
voltage, etc.) within the permissible temperature range, the T4896 switches off
immediately. The alarm contact is confirmed, the front-side ALARM LED and the
background lighting of the display illuminate, and the cause of error is shown on the
display in plain text.
A 24 V DC signal for an external alarm is also connected to terminals 11-10.
2.1 Scope of delivery
Safety temperature limiter STL4896 with packaging
This operating manual
2.2 Features
Can be used as
STB
Safety temperature limiter
ASTB
Exhaust gas safety temperature limiter
STW
Safety temperature monitor
Certified according to EN 61508 SIL2
Pt100 input, 3-wire connection or double thermocouple J, K, N and S
Programmable temperature limit value and switching hysteresis
Basic accuracy <0.5 %, ±2 digit
Reaction time ≤ 0,5 s
Alarm output 1 relay, SPDT
Pre-alarm output 1 relay, SPDT
Analog output 0/4 ... 20mA, 0/2 ... 10V
Memory function for error message
Operator lockout (password-protected)
Housing for control panel installation
