Description
Product Overview
The Mobrey MCU901WX-A/RS is a high-performance, wall-mounted universal control unit designed for use with ultrasonic level transmitters. It processes level, volume, and open-channel flow data, providing extensive control, logging, and calculation functions. Housed in a rugged, weatherproof enclosure, this unit features dedicated control relays and data communication capabilities, making it ideal for managing complex water, wastewater, and industrial fluid processing operations.
Technical Specifications
- Model ID: MCU901WX-A/RS
- Enclosure Type: Wall Mount (Weatherproof IP65 / NEMA 4X)
- Dimensions: 175 mm x 250 mm x 100 mm
- Weight: 1.20 kg
- Country of Origin: United Kingdom
- Power Supply: 115/230 VAC or 24 VDC (model dependent)
- Signal Inputs: 4–20 mA / HART protocol compatible loop inputs
- Relay Outputs: Multiple independent, fully programmable SPDT control relays
Application Areas
🌊 Open-Channel Flow Calculation and Monitoring
🚯 Wastewater Wet Well and Pump Control Systems
🏭 Industrial Tank Level and Volume Measurements
📉 Data Logging and Process Diagnostics
💧 Chemical Storage Tank Supervision
Operational Guidelines
Power-Up / Power-Down Sequence
- Startup: Ensure the enclosure is properly mounted and all cable glands are sealed against moisture. Apply the rated input power (AC or DC) to the internal terminal strip. The LCD screen will initialize and run through a self-check routine; verify that the system settles into the measurement display without active loop-failure faults.
- Shutdown: De-energize any external control voltages routed through the output relays. Switch off the main supply breaker to the control unit. Wait for the screen to go completely dark before opening the enclosure cover to perform wiring adjustments or sensor maintenance.
Step-by-Step Standard Operation
- Enclosure Check: Inspect the rubber sealing gasket on the front cover to ensure a tight, weatherproof seal.
- Transmitter Connection: Connect the 4–20mA or HART signal leads from the remote ultrasonic sensor into the dedicated input terminals.
- Parameter Programming: Access the menu system via the front keypad to input tank shape dimensions, flow profiles, or relay trip levels.
- Relay Set-Points: Assign specific relays to function as high/low alarms or to drive alternating wet-well pump sequences.
- Telemetry Verification: Cross-check the displayed fluid depth or calculated volume against a physical dip-tape measurement to confirm calibration accuracy.
Frequently Asked Questions
Q: What does a “Current Loop Fault” message mean? A: This usually points to a break in the wiring loop, insufficient voltage to the field transmitter, or an incorrectly landed signal shield. Inspect the cable run between the MCU901 and the ultrasonic sensor.
Q: Can this unit calculate flow rate through standard flumes and weirs? A: Yes, the microprocessor contains pre-programmed linear formulas and exponent algorithms for a wide range of standard open-channel flow structures (e.g., Venturi flumes, Parshall flumes, and V-notch weirs).
Q: How do I protect the internal programming from unauthorized changes? A: The MCU901 series features a multi-level pin code security protocol that can be enabled in the system setup menu to lock out the front configuration keypad.
