The filling, draining and monitoring solution
Level control relays are used to monitor or maintain levels of conductive liquid or non-conductive material. Level control is usually achieved with float switch fitted contacts, which change state according to the position of the float switch. Due to the relatively low currents going through these types of probes, their reliability is questionable. This is particularly true in polluted environments and when there are shocks and vibrations. To properly respond to the requirements of level control, the Zelio Control range offers relays that monitor by measuring liquid resistivity. This operating principle eliminates the problems encountered with contact probes. These monitoring relays enable adjustment of measurement sensitivity so as to precisely set closing and tripping levels. In addition, a selectable time delay takes wave effect into account, avoiding unwanted closing and tripping due to movements of liquid. Non-conductive level control is achieved by accepting the signal from a limit switch, photo electric sensor, capacitive proximity sensor, pressure sensor, or untrasonic sensor.

Features and benefits

• Standard dimensions: compact and modular
  format 35 mm
• Fewer catalog numbers for maximum
  efficiency: single voltage 24 VAC/DC to
  240 VAC/DC
• Offer covering all applications: conducting
  liquids and other materials
• Drain or fill modes
• Settings protected by sealable cover
• Clear display of control state by LEDs
• Adjustable time delay