Electrode Relay

Overfill Cut-Out Device According to § 19 WHG

Part No. ER-107/B

For level switch

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)


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).


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.

Hence, beside monitoring and reporting of wire interruptions and level increase up to the pickup's point of response, the ER-107 also monitors working current failures.

The conductive double rod electrode has a G1½" connection thread as standard.

Technical Data
Storage temperature

-30 °C to +80 °C

Operating temperature

-20 °C to +90 °C


Screw joint and head: PPH (Polypropylene)

Coating: Polyamide

Connection thread G 1½”

Pressure 10 bar


Rod material

stainless steel (1.4571)

Rod diameter

4 mm

Rod length

300 mm

Double rod electrode according to §19 WHG

ER 107/B


- Contacts: 2 potential-free SPDTs (simultaneously operated)

- Max. switching voltage: 250 V AC; 150 V DC

- Max. switching current: 5 (3) A AC; max. 5 A DC

- Switching capacity 1: 250 VA DC; 50 to 180 W DC (depending on switching voltage)


- Open circuit voltage: <10 V AC

- Short circuit current: <5 mA

- Switching delay approx.: 0.5 s

- Sensitivity range: 1 to 30 kOhm



2 LED zur Signalisierung von Betrieb, Leitungsfehler und Alarm

Z-65.13-405, Z-65.40-191

Storage temperature

-30 °C to +80 °C

Operating temperature

-20 °C to +60 °C


- Weight: approx. 150 g

- Protection: terminals IP20, enclosure IP40


Power consumption

1 VA

Power supply

230 V AC ±10 % or 24 V DC ±10 %

other voltages on request


Specifications subject to change.


Data Sheet Overfill cut-out Device acc. § 19 WHG

Overfill cut-out Device acc. § 19 WHG – electrode relay and conductive probes

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