UFM Series 6
Q.Sonic-plus
Operation and Maintenance
5.2 Signal Processing Unit
The SPU is mounted in an explosion proof housing. The box consists of two
separate compartments; a main and a rear compartment (see Figure 5-2).
The main compartment can be opened from the side of the SPU and
contains the main circuit boards. The main compartment also comprises
intrinsically safe connections for the ultrasonic transducers and temperature
and optional pressure sensors. All data processing from excitation of the
transducers to calculating the flow rate is handled by the electronics in this
compartment.
To prevent the box from opening by vibration, the covers on the side need to
be firmly tightened and secured with the lock screw in the cover, as seen in
Figure 5-2. When closing the back compartment, ensure all screws are used.
A grounding point can be seen at the bottom of the SPU. As the meter is
already internally grounded, it is not necessary to use this grounding for
normal operation.
The rear compartment comprises of a field terminal board used for
connecting the Ultrasonic Flow Meter Series 6 to the end user’s applications.
For detailed information about this see Chapter 6.3 Wiring Instructions
(p.31).
Figure 5-2: SPU Compartments and SPU Cover
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