46
Section 2
Scanner
®
2000 microEFM
Measuring Liquid via a Differential Pressure Meter
Note This section contains installation guidelines for orifice and cone meters. If installing the Scanner 2000
with an averaging pitot tube meter, refer to manufacturer instructions for installation.
Best Practices
To ensure measurement accuracy, ensure that the meter run complies with the following AGA-3 and ISO 5167
guidelines, as applicable:
• Do not place unit near vents or bleed holes that discharge corrosive vapors or gases.
• Consider the orientation of the meter run when determining the best position for mounting the Scanner.
– If the Scanner 2000 is mounted to a horizontal pipeline, make sure process connections are horizon-
tal with the pipeline, or sloped downwards towards the Scanner. Mount the Scanner 2000 below the
pressure taps at the pipe. Use the side (upper) ports as process connections and the bottom ports for
draining and filling the DP housings.
– If the Scanner 2000 is mounted to a vertical pipeline, install the sensor below the differential pressure
source connections. Slope all tubing downward at least 1-inch/linear foot to avoid gas entrapment.
• Mount the Scanner 2000 as near level as possible such that the operator has a clear view of the LCD, and
can access the keypad easily when the enclosure cover is removed. The location should be as free from
vibration as possible.
• Make sure the high port of the sensor (marked “H”) is connected to the upstream side of the meter run.
• Pipe diameters (D) should be between 2 in. (50 mm) and 39 in. (1000 mm) per ISO 5167; or greater than
2 in. (50 mm) per AGA-3.
• Pipe Reynolds numbers must be above 5000. Avoid high-viscosity liquids (greater than 15 cP).
• d (orifice diameter) must be greater than or equal to 0.45 in. (11.5 mm).
• Orifice β (diameter ratio) must be greater than or equal to 0.1 and less than or equal to 0.75.
• Gauge lines should be of uniform internal diameter and constructed of material compatible with the fluid
being measured. For most applications, the bore should be no smaller than ¼ in. (6 mm) and preferably,
3/8 in. (10 mm) in diameter. The internal diameter should not exceed 1 in. (25 mm). If high-temperature
fluids are likely to be encountered, make sure the measuring tube used is rated for the anticipated tem
-
perature range.
• If there is possibility of freezing, the gauge lines can be filled with a suitable seal liquid. The seal liquid
should be somewhat denser than the process fluid, should not dissolve in it, should have a sufficiently low
freezing point, and should be non-toxic. Alternatively, heat tracing can be used.
• Gauge line length should be minimized to help prevent pulsation-induced errors.
• Gauge lines should slope upward to the meter at a minimum of one inch per foot.
•
If gauge lines must slope in more than one direction, do not allow more than one bend and install a gas
trap.
• Gauge lines should be supported to prevent sag and vibration.
•
Where pulsation is anticipated, full-port manifold valves with a nominal internal diameter consistent with
the gauge lines are recommended.
If the Scanner 2000 is mounted to a cone meter, consider the following guidelines in addition to the best
Summary of Contents for Scanner 2000 microEFM
Page 1: ...NUFLO Scanner 2000 microEFM Hardware User Manual Manual No 9A 30165023 Rev 10 ...
Page 26: ...26 Section 1 Scanner 2000 microEFM ...
Page 104: ...A 18 Appendix A Scanner 2000 microEFM ...
Page 106: ...B 2 Appendix B Scanner 2000 microEFM ...
