Conductive level switch ER-107/B

for liquidsstainless steel

Limit level detection of conductive liquids, a measurement systems consists of a double rod electrode and an ER-107 relay -Overfill cut-out device according to § 19 WHG -Slimline construction, width only 22.5 mm -Adjustable sensitivity -Potential-free output as SPDT (2 x) -Power supply 230 V AC ±10% 48-62Hz, 24 V DC ±10% (optional) Construction The overfill cut-out device consists of the pickup (conductive double electrode) and the electrode relay type ER-107. It provides a binary switching signal at the out-put. This signal can be sent directly or via a signal amplifier to the report device or to the control section and its control element. The overfill cut-out device's components which have no test certificate have to correspond with the sections 3 and 4 of the device's approval principles (ZG-ÜS). Function The electrode relay ER-107 provides a measurement voltage which makes a "working current" flow through the signal wire via the built-in resistor in the pickup. As soon as this working current is interrupted (e.g. cable break) this is detected and displayed by the ER-107 and the source contact switches to alarm status. When the filling level of the container reaches the conductive pickup's rods a measurement current is able to flow through the conductive liquid. This current, which is higher in comparison with the working current, is detected by the ER-107 and the alarm message is generated. The sensitivity can be adjusted within the response range of the probe using a potentiometer. The ER-107 functions are based on the closed circuit current principle. The alarm status of the relay corresponds with the dead condition of the device.