ER-142 / 143 Electrode relay

• Ex-ia version, Zone 0
• Optical alarm and operation status indication
• Potential-free output as SPDT

The electrode relays ER-142 and ER-143 are designed for our conductive probes which are installed in areas with explosive atmospheres.

The areas of use cover all sectors where liquid and conductive media are to be detected or controlled. Limit value measurements (overflow, dry run, max. alarm) as well as min./max. control and pump control (hysteresis) can be implemented.

The electrode relays here are used as an interface between Ex- and "Non-Ex" area. The units however are not allowed to be operated in  Ex-areas. Safe isolati-on is tested and certified by the PTB (Physikalisch-Technische Bundesan-stalt).The devices can also be used as contact protection relays if e.g. pickups only al-low low contact loads but on the other hand higher loads have to be switched.

The electrode relays ER-142 and ER-143 basically consist of the four functional components power supply, intrinsical unit, potential free output and the measurement and evaluation electronics. The ER-142's potential free output consists of one SPDT, the ER-143's output of two SPDTs (simultaneously operated).

The relays represent a complete functional unit for capture and control purposes of levels in combination with our rod and suspension electrodes which are available in a large variety of types for many various applications.

It is possible to use the ER-142 and ER-143 electrode relays as a contact protection relay by combining it with our rod / suspension electrodes or "signal pickups" (e.g. pressure bell, float switch).