Features; Measuring Principle; Operational Safety - Icon Process Controls truflo UltraFlo 2000 Series Operating Manual

UltraFlo ® 2000 SERIES
Ultrasonic Flow Meter

Features

All Plastic HDPE Wetted Materials
High Accuracy: ± 1.0%
Superior Corrosion Resistance
4-20mA + Pulse Relay Output | RS-485
Negligible Pressure Drop
Empty Pipe Alarm
Air Bubble Detection

Measuring Principle

The ultrasonic flow measurement is based on the phase-difference approach:
Two ultrasonic-sensors located opposite from each other alternatively transmitting and receiving ultrasonic signals. If there is no liquid
flow both sensors receive the transmitted ultrasonic signals in the same phase, i.e. without phase difference. If liquid is flowing there is a
phase shift. It differs when measured in direction of the flow than when measured against the direction of the flow. This phase difference
is directly proportional to the flow rate.
Sender /
Receiver

Operational Safety

Comprehensive self-tests ensure highest possible safety.
Faults (process or system errors) are output on a digital output or displayed on the display menu.
The protection class is IP 67.
Flowmeter meets the general EMC immunity requirements according to CE, EN 61000-6-3, EN 61000-4-2,
EN 61000-4-3, EN 61000-4-4, EN 61000-4-5, EN 61000-4-6.
Flowmeter meets the safety requirements concerning the Protective Extra Low Voltage directive
according to EN 50178, SELV, PELV.
D
v
c v
c + v
w L
+ =
c + v
L : length of measuring pipe
K : factor
D : diameter of measuring pipe
v : flow velocity
c : sound velocity of the fluid
( )
~ ~
v K *
-
- +
: phase with the flow
+
: phase against the flow
-
Fig. 1: Presentation of the principle of ultrasonic flow measuring
L
w L
+ =
c + v
c
v
c - v
v
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0% 50% 100%
Flow [GPM]
400.0
Total [GAL]
5496
Display Blind Display
Receiver /
Sender
04