Mace HVFlo XCi, Product Manual, Page: 28 / 255

Selecting a suitable site for Doppler ultrasonic velocity measurement
When selecting a suitable site to measure flow you must consider the following:
NOTE: Doppler ultrasonic flow measurement is generally unsuitable for use in:
- Ground water measuring applications,
- High pressure centre-pivot or lateral-move irrigation equipment.
Does the stream flow that I wish to measure contain sufficient acoustically reflective particles
such as sand, silt, dirt, leaves or air bubbles? (The stream that you wish to measure must contain
at least 100 parts per million of acoustically reflective particles that are greater than 75 microns in
size).
Yes – The stream flow is suitable for Doppler ultrasonic flow measurement.
No – The stream flow is unsuitable for Doppler ultrasonic flow measurement, use a MACE Electromagnetic
insert flow sensor instead.
NOTE: If you are unsure of the amount/size of acoustic particles a general rule of
thumb is that surface water flows should be flowing a minimum of 0.15 m/s (0.5 ft/s).
Please do not hesitate to ask your local MACE representative.
If the pipe flows full, is the internal pressure of the pipe within the range 0 - 25 m (0 - 253kPa, 0 –
37 psi)?
Yes – The stream flow is suitable for Doppler ultrasonic flow measurement.
No – The stream flow is suitable for Doppler ultrasonic flow measurement only if it contains at least 100 parts
per million of suspended solids that are greater than 75 microns in size.
Does the pipe in which I am measuring, run full or partially full?
Full – An insert velocity or velocity only sensor can be used.
Partial – A combined area/velocity sensor will be required.
What pipe diameter is suitable for MACE Doppler ultrasonics?
MACE recommends a maximum pipe diameter of 2.5m (100”). MACE Doppler ultrasonics WILL operate in
larger pipes, but a reliable gauging MUST be performed for the most accurate readings.
Can I get access to the outside wall of the pipe for mounting the sensor?
Yes
– Consider using an insert velocity sensor if the pipe runs full.
No
– Must use a ZX SnapStrap mounted sensor internally.
MACE XCi User Manual - 28 -