Delta Mobrey MCU 200 Industrial Controller

Delta Mobrey MCU 200 Industrial Controller and gap sensor when used together provide an ultrasonic point level liquid switch. Typical applications include sludge blanket level detection in settlement tanks, interface detection for immiscible liquids and contamination detection, such as oil in water or water in oil. The MCU201 and MCU203 level control units provide simple and economical control electronics for wall-mounting near a tank or pipeline containing a single ultrasonic gap sensor. The sensors operate on the attenuation of an ultrasonic signal through the fluid.

Ultrasonic liquid point level switches (gap type sensors) are used in non-hazardous area industrial processes to detect high or low liquid levels or liquid interface. Mobrey ultrasonic point level switches are activated when there is a liquid present between the sensor’s transmitter and receiver crystals.

In this way, the absence of liquid results in a low level being indicated. The level switches are fitted with dual-coaxial cable for connection to a control unit. This cable can be extended with suitable coaxial extensions up to 164 ft. (50 m). Typical applications include interface detection duty for immiscible liquids and sludge blanket level.

Delta Mobrey MCU 200 Industrial Controller Features:

  • Wall-mounting IP65 polycarbonate enclosure
  • DPDT relay output for wet-to-dry or dry-to-wet changeover indication, external control, or alarm condition indication.
  • Accepts a voltage-free contact input e.g. to actuate a pump control function via the output DPDT relay
  • Three LED indicators – Normal, Alarm, and Fault
  • Selectable time delay (0.5, 2, 8 or 30 seconds) for wet-to-dry or dry-to-wet changeover
  • Continuous cable check between controller and Mobrey 400SD Point Level Detector


  • A wall-mountable Mobrey MCU200 Series industrial control unit for monitoring the level switch state and provide the required switching function
  • A tank-mountable Mobrey 402SD or 433SD ultrasonic point level switch containing transmitter and receiver piezo-electric crystals

Delta Mobrey MCU 200 Industrial Controller Specification:

Mobrey MCU200 Series MCU201 MCU203
Number of Level Switch Inputs 1 1
Power Supply (Selector Switch) 110/120 Vac or 220/240 Vac selectable 24 Vdc grounded (earthed) negative
Power Consumption 6 VA 2.4 W
Relay Output Double-Pole Changeover (DPDT)
Energized when sensor is wet or dry (selectable by switch)
Relay Rating 5A at 230V 5A at 230V
Box Dimensions 7.9 x 4.7 x 3 in. (200 x 120 x 75 mm) 7.9 x 4.7 x 3 in. (200 x 120 x 75 mm)
Box Rating IP65 Polycarbonate IP65 Polycarbonate
Holes for glands 3 off 0.63 in. (16 mm) diameter 3 off 0.63 in. (16 mm) diameter
Fixing centres (WxH) for Wall Mount 7.4 x 3.4 in. (188 x 88 mm) 7.4 x 3.4 in. (188 x 88 mm)
Fixing Hole Diameter 0.16 in. (4 mm) 0.16 in. (4 mm)
Frequency Selection By switch on PC board By switch on PC board
Visible through the box lid
LED Indicators Green for normal. Red for alarm condition. Amber LED for fault condition
Selectable for wet/dry sensor, as appropriate for the application
Gain Potentiometer Fitted with scale and separate range switch to adjust for sensor type and site conditions
Selectable delay of 0.5, 2, 8 or 30 seconds
Response Time Delay selectable for wet-to-dry or dry-to-wet changeover
50 ms response in opposite direction
Sensor Cable Check Selectable to monitor coax screen to sensor for continuity
Fault lights fault LED and sets relay to alarm state
Auxiliary Input External closed circuit input to MCU200 latches the output relay to achieve pump control

Download Data Sheet: Industrial Controller MCU 200 Series


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