Contrec 120A Level Monitor

Contrec 120A Level Monitor

Contrec 120A Level Monitor accepts a 4-20mA signal from a wide range of level sensors, including Pressure Transmitters, Ultrasonic Sensors or Capacitance Probes, and displays both level and tank contents on a large LCD display. The 120A is a high-accuracy Level Monitor designed to operate with analog level sensors. Having an IP67 weatherproof case, tactile keyboard, and various mounting options makes it a very versatile unit.

Contrec 120A Level Monitor Features

  • Non-linear Tank Correction
  • Four Level Alarms
  • Fully Programmable
  • Level Bar Graph Display
  • Tank Contents Display
  • Powered by 4-20mA Loop
  • Panel, Wall and Pipe Mounting
  • Watertight to IP67 (Nema 4X)
  • CE Compliant

Field Mounting Level Monitor

Solid state relay outputs provide up to four level alarms and a 25 point non-linearity correction table allows the instrument to be programmed to fit most tanks. The Level Monitor is powered entirely from the 4-20mA current loop and, therefore, requires no external power or batteries.

The instrument is fully programmable with set-up parameters such as span, offset, alarm levels, etc, stored in a non-volatile memory which will retain all data for more than 10 years without power. The monitor is housed in a rugged, yet attractive, IP67 (Nema 4X) polycarbonate enclosure which is completely watertight. A wall mounting bracket (no gland holes) is supplied as standard, while panel and pipe mounting brackets are available as options.

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Contrec 120A Level Monitor General Specifications


  • Temperature Limits: –20 to +60°C, –4 to +140°F


  • Cable Entry: By cable gland
  • Materials: Polycarbonate and ABS


  • Level: 20 segment LCD bar graph
  • Level Span: 0…100% proportional to input signal. Non-inverting tanks – 0% equals 4mA and 100% is 20mA. Inverting tanks – 0% equals 20mA and 100% is 4mA
  • Contents: 7 digit 12mm (0.48”) high LCD (continuously powered) with 41/2 digital resolution and trailing zeros
  • Interference: CE compliance 4-20mA
  • Resolution and Linearity: 0.05% of span Accuracy: 0.05% of span @ 25°C, 0.1% (typically) of span full temperature range
  • Update Time: 0.5 second
  • Connection: 2 wire
  • Voltage Drop: 2.5V maximum High & Low Alarms
  • Type: 4 x open collector outputs suitable for driving DC solenoid or external relays.
  • The outputs provide:
    • 1. high-high,
    • 2. high
    • 3. low
    • 4. low-low
  • Switching Power: 200mA, 30Vdc maximum Saturation
  • Voltage: 0.8Vdc typical across the output in the “ON” state
  • Isolation: All outputs are separately opto-isolated

Download: Datasheets