UFM2/UBT User Manual
Issue 1.1b July 20 Page 7
2.1.2 Clean the Pipe’s Flow Sensor Contact Area
Prepare the pipe by degreasing it and removing any loose material or flaking paint in order to obtain
the best possible surface. A smooth contact between pipe surface and the face of the sensors is an
important factor in achieving a good ultrasound signal strength and therefore maximum accuracy.
UBT: The area of pipe where the temperature sensors are to be attached must be free of grease
and any insulating material. It is recommended that any coating on the pipe is removed so that the
sensor has the best possible thermal contact with the pipe.
2.2 Connect Power and Signal Cables
This section explains how to connect power and signal cables to the Electronics Module.
2.2.1 Power Supply
The meter will operate within the voltage range 12 - 24V DC/ 24V AC. The supply must have a
minimum rating of 7W/7VA per instrument. Connect the external power supply to the Brown and
Blue wires of the six-core cable.
EXTERNAL POWER SUPPLY MUST BE CLASS 2 RATED.
IMPORTANT: IT IS THE RESPONSIBILITY OF THE INSTALLER TO CONFORM TO THE
REGIONAL VOLTAGE SAFETY DIRECTIVES WHEN CONNECTING THE METER TO A
POWER SUPPLY USING A MAINS-RATED TRANSFORMER.
The interface cable supplied is a 6-core cable for power, pulse output and 4-20 mA (if fitted)
connections.
Figure 6 6-core main interface cable
The un-insulated wire is the connection to the screen of the cable and should be earthed for full
immunity to electrical noise.
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