The electronic boiler water low level alarm WMS from AFRISO-EURO-INDEX is designed to control water levels in heating systems according to DIN EN 12828. As soon as the water level falls below a minimum level, the WMS sounds an alarm and the burner is switched off. The WMS boiler low level alarm works faultlessly and is also self-checking and does not only detect low water levels in the boiler but also open or short circuit faults within the sensing probe circuit. The complete WMS system consists of the control unit and a sensing probe which is connected by a
2-core signal cable with max. length of 50 m. The control unit, which incorporates all indication and operating elements as well the electronics, is available in two versions: With an internal mains failure lock (after mains failure the control unit must be re-set) or with an external mains failure lock (after mains failure the units re-sets automatically). The sensing probe consists of a metallic probe head with an additional plastic housing and a probe rod which can be pulled out by approx. 12 to 13 mm for function test purposes. The sensing probe is also available in two versions: The probe DN 20 has an angled probe housing with two (DN 20) welding sockets; the probe R 2 has a probe housing in form of a threaded socket with R 2 external thread. The control unit WMS is suitable for use in ambient temperatures from 0 °C to +55 °C, for boiler water temperatures up to max. 120 °C and water pressures up to max. 10 bar. WMS requires a 230 V AC supply; a voltage-free relay contact is provided for remote signalling, for instance of leaks, to event reporting systems, internet, Email, mobile telephones or fax. A biased push-button switch (NO) can be installed up to a distance of 200 m for external re-set.