Installation and connection
13
High limit safety cut-out (HLSC)
The EHS-R has a sensor for the high limit safety cut-out. This is a PT1000 sensor in a sensor well
between the heating elements. It is connected at the factory at the connection shown below.
When a temperature of 95 °C is reached at the STB sensor, the immersion heater is deactivated. It
can only be reactivated when the temperature falls below a value of 90 °C (= 5 K hysteresis).
The electronics temperature is also monitored. Their maximum temperature is 75 °C (5 K hysteresis).
Sensor installation, PWM input
The EHS-R has 2 sensor inputs, which are only suitable for connection of
PT1000 sensors
. The
measurements of these sensors are transferred via the CORA wireless connection. This establishes
the connection for
PWM control
. More detailed information can be found in the chapter of the same
name.
