LRF-3000P Ultrasonic flowmeter
- 16 -
Caution:
DO ensure that the flowmeter is filled. DO NOT make the liquid flow downwards vertically, or it
may have bubbles.
5.2.4 Requirements on the front/rear straight pipe sections
DO ensure a straight pipe section at least ten times of the pipe diameter (D) in the upstream of the
flowmeter and at least five times of the pipe diameter (D) in the downstream of the flowmeter. The
nominal accuracy depends on the pipe diameters in the upstream; according to the interference,
insufficient front/rear straight pipe sections may cause about 0.5% deviation.
To ensure measurement accuracy of the flowmeter, try to satisfy the following requirements on
the length of straight pipe sections installed nearby the flowmeter: upstream >20
D
,
downstream>10
D.
Try not to disturb the upstream flow distribution. Ensure no valves, elbows or triplets; try to install
the control devices or throttles in the downstream if any, so as to ensure sufficient pipe flow at the
measurement point, details are shown below:
General conditions
Install after the elbow
