3.4 Mechanical and Hydraulic Installation
1. In order to mechanically fix the flowmeter body, 2 fixation threads on the backside of the housing can
be used (see Figure 6).
2. Assure that at the mounting location, the allowed ambient temperature and humidity ranges are not
exceeded (see Table 3).
3. Clamp the sensor to the tubing according to the procedure described in Section 3.5. Use only tubing
material for the specified calibration (see calibration sheet).
4. The flow circuit should be filled completely with fluid. The integrated converter contains special
algorithms, which increase the robustness of the measurement against bubbles. However, assure
that excessive bubbles are avoided in the circuit.
5. Ideal mounting position for the flow sensor is vertical direction (if not possible a slight angle) with
upward flow direction to avoid the stagnation of bubbles and particles in the measuring path of the
tubing.
6. An arrow mark on the flow sensor (see Figure 7) indicates the flow direction. Make sure that the
arrow corresponds to the direction of the flow in the hydraulic circuit.
7. Avoid excessive vibrations such as in the vicinity of displacement pumps. Insufficient contact of the
transducer (within the sensor) onto the pipe wall caused by vibration may result in inaccurate
measurement.
8. The flowmeter measures flow velocity. In order to obtain fully developed flow pattern for accurate
velocity measurement, straight run of 30x tubing ID upstream and of 12x tubing ID downstream is
recommended. If non-uniform turbulent flow or swirl flow is expected, install longer upstream straight
run and/or a flow-rectifier.
9. To install on a tubing that has open end, the sensor should be mounted in lower position of the
pipeline.
10. The sensor should be mounted where pressure in the pipe is above the atmospheric pressure in
order to avoid bubble generation by cavitation effects.
11. Devices like valves are recommended to be installed downstream of the sensor in order to prevent
formation of bubbles in the liquid. An upstream valve may form bubbles reducing the intensity of the
ultrasound signal and interfering with measurement.
12. A bypass pipe run (including bypass valve and shutoff valve) may be used for easy zero adjustment
and maintenance.
13. Please confirm that the maximum pressure is below the maximum pressure of the flexible tubing and
the maximum pressure of the sensor specified in Table 3.
11. After setup a “Zeroing” is recommended. Assure that the sensor is filled completely with the according
fluid and is free of bubbles. Stable liquid properties should be assured by flushing the circuit with the
final liquid until temperature and viscosity becomes stable. After this, zero flow shall be realized.
Section 4.1.3 explains the zeroing possibilities.
14. If Re-Zeroing is regularly necessary, automation is possible over the digital input of the flowmeter.
For the configuration of the digital input the Levitronix
®
Service Software is needed. Consult the
manual of the service software for more detailed description.
15. In the following cases a re-zero is recommended:
a. 30 minutes after power-on of a cool flowmeter.
b. Change of fluid properties (temperature, viscosity, density).
c. Change of chemistry.
d. Clamp-on of the sensor to a new tubing.
e. Change of the hydraulic circuit.
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