Level switches for water and oils
August 2010
Level Measurement & Control
The Afriso Watchdog Minimelder/Maximelder-R is a level switch designed to signal minimum or maximum levels of water, heating oil EL, L, M, oil/water mixtures and neutral, non-viscous and non-adhesive liquids in tanks. Minimelder/Maximelder-R consists of a control unit and a probe connected by a signal cable over a distance up to 50 m. Housed in an impact resistant plastic housing, the control unit contains the display elements and controls as well as signal processing electronics for conversion of the probe signal, which is then available via a normally open relay contact for use in alarm unit or event reporting system. The device is supplied from 230 VAC and suitable for ambient temperatures in the range -5 to 55°C.
The probe consists of a float switch in which a moving magnet switches a contact. The factory setting of the magnet causes the unit to switch either when the probe is immersed or not immersed.
Watchdog Minimelder-R
The probe is mounted in the bottom area of the tank and generates an alarm signal when the liquid level falls and the probe is no longer immersed in the liquid.
Watchdog Maximelder-R
The probe is mounted in the top area of the tank and generates an alarm signal when the liquid level rises and the probe becomes immersed.
Accessories include a seal kit (IP54) and a mounting frame.
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