© 2017 Van Putten Instruments BV | MAN-VP-SINL-UK | Revision:1701 | Date:22-03-2017
12
VPFlowScope in-line
6
Mechanical installation
First select the right installation point. The installation point is crucial for the right measurements.
Sources of error can be: installation effects, unknown flow profiles, swirls, pressure and temperature
effects, humidity effects or oscillations in the flow. To ensure the highest possible accuracy of flow
measurement, the installation and piping instructions must be followed. Therefore read this paragraph
carefully.
Take into account:
·
Choose a site which is accessible, which allows ease of wiring and maintenance, and which allows
you to still read and access the display if possible.
·
Meet the specifications of the VPFlowScope in-line. If the specifications are not met, for instance
the pressure or temperature level is too high; this will cause inaccurate flow measurement and can
even damage your flow meter.
Avoid:
·
Excessive heat, check the temperature range of your VPFlowScope in-line.
·
Potential water damage on the outside. Avoid areas of high humidity and avoid dripping. Be aware
that the VPFlowScope in-line is not watertight, it is only IP65 (when mated with the USB protection
cap).
·
Corrosive atmosphere where possible.
·
Electrical problems (high voltage/ high power).
·
Mechanical vibration and danger (walking bridges, fork lift trucks).
Warning: These devices are only for use with Air, Nitrogen, Argon, Helium, Carbon
Dioxide and other non hazardous, or non combustible gases. The maximum working
pressure is 16 bar (250 psi)
6.1
Piping table
Check the piping table below for your application. The table shows the amount of length upstream or
downstream depending on the installation. If applicable in front of the meter, use given upstream
length. If applicable in behind the meter, use given downstream length. Gas flow in pipes follows
certain rules, which must be observed for optimal measurement results. For some exceptions the
upstream length needs to be longer, or can be shorter.
If possible choose a longer upstream length, as these are minimum values. The up- and
downstream lengths are used industry wide as guidelines, but will never be a guarantee
for obtaining the “true value”. So always be careful and try to build up your own
experience from practical measurements
Piping table
The following table provides a guideline for proper distances between upstream or downstream
objects and the VPFlowScope in-line. The upstream length is the length between the last non-
straight object and the VPFlowScope in-line. If the upstream length is straight, and the distortion is
downstream of the VPFlowScope in-line, you can use the column "downstream length" as a
guideline. In very complex situations, with multiple up- and downstream objects, you should consider
another location. This table is a practical guideline and is not exact science. Practical situations can
have multiple sources of distortion, therefore VPInstruments does not take any responsibility for the
correctness.
