JUMO 14597 safetyM TB/TW - Temperature Limiter and Temperature Monitor Operating Manual - Manual (Page 6)

1 Brief description 2014-06-12 4
1 Brief description
Temperature limiters (TB) and temperature monitors (TW) are used to monitor thermal processes in systems, to signal
whenever the measurement exceeds or falls below an adjustable limit value.
This limit infringement is indicated by built-in LED K1 and the fitted relay switches the system to a safe operating state
(alarm range).
1.1 Temperature monitor (TW)
The temperature monitor is a device which, when activated, resets automatically if the sensor temperature has fallen below or
risen above set limit value AL by an amount equal to the switching differential.
v Chapter 7.5 “C115 Switching action”
1.2 Temperature limiter (TB)
The temperature limiter is a device which, when activated, is locked out. It can be reset by hand or with the aid of a tool, if the
sensor temperature has fallen below or risen above limit value AL by an amount equal to the switching differential.
v Chapter 7.5 “C115 Switching action”
1.3 Differential measurement
The TB/TW can measure the differential of two Pt 100 resistance thermometers in a 2-wire circuit.
If the system is within the OK range, the relay is active and LED K1 shows green.
If the system leaves the OK range or infringes set limit value AL, the relay switches off and LED K1 shows red.
v Chapter 7.1 “C111 Analog inputs”