Handheld Ultrasonic Flowmeter - 39 -
8. Appendix
8.1 Battery Maintenance and Replacement
The battery is Ni-H rechargeable battery. Therefore, it is recommended to discharge the battery by
leaving the instrument ON (it will automatically turn OFF after a few minutes) every 3 months.
Recharge the battery again to its full extent with the supplied AC adapter. To get close to 100%
power, charge the device overnight
When the battery is unable to power the instrument for 2 to 3 hours after it is fully recharged, this
usually indicates that the battery is near its product life and needs to be replaced. Please consult the
manufacturer for replacing the battery pack.
§8.2 Transducer Installation Guide
8.2.1 Find the mounting site
(A)
Pipe must be full of liquids at the measurement site.
(B)
No heavy corrosion of deposition inside of the pipe.
(C)
Must be a safe location.
(D)
The straight run of the pipe must not be shorter than 15D as a general guideline, where
D
is the pipe diameter. Insufficient straight pipe length will degrade the accuracy of the
results.
(E)
The transducer mounting site should be 10D straight run upstream and 5D straight run
downstream
(F)
If there are flow disturbing parts such as pumps, valves, etc. on the upstream, the
straight
pipe length should be increased. The disturbance strength of those flow conducting
parts will
be (low to high):
Single Bend -> Pipe Reduction / Enlargement -> Outflow Tee -> Same Plane Multiple
Bends
-> Inflow Tee -> Out of Plane Multiple Bends -> Valve -> Pump
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