Document No LM0670 Issue A Rev 2 November 2017 Page 6 of 15
All positive displacement meters are independent of pipe-work effects, and therefore valves, bends, tees,
etc may be mounted directly onto the flowmeter process connections and the pipe size varied also.
However, to provide optimum performance the meter body should be installed vertically with the process
connections to a horizontal flow line. Screwed anchorages are provided on the underside of the flowmeter
to support the meter and avoid pipe strains, etc. Signal connection is made via a junction box on top of
the flowmeter or via the display. Vertical access should be provided for the field cabling connection and
for maintenance purposes. Litre Meter do not recommend the meter is installed for vertically downward
flow. The calibration certificate will confirm calibration orientation, if non-standard.
Care should be observed on start up to avoid high pressure drops across the flowmeter. The flowmeter
can be specified with several rotor materials including carbon, titanium and stainless steel. There is a
risk of the rotor or chamber damage if a high pressure drop or a high acceleration across the flowmeter is
experienced. Typically, this may be caused by:
w Air in the line
w Opening a valve too quickly
w Purging with compressed air (or steam)
w A sudden introduction of fluid into an empty pipe
To prove the flowmeter is functioning without being installed in the line, it is possible to blow gently
through the meter depending on meter size. You may be able to hear the rotor rotate and see the flow
display.
Ensure that any dangerous fluids that may be in the meter are removed before this test.
Please
do not use an airline as the rotor may be unknowingly damaged.
Blocking and Bypass valves should be installed if it is necessary to do preventative maintenance on the
flowmeter without shutting down the flow system. The Bypass valve can be opened before the Blocking
valves allowing the flow to continue while removing the flowmeter for service.
Important: All flow lines should be purged prior to installing the meter. To prevent possible damage to
the meter, install the meter ONLY in flow lines that are clean and free of debris.
Upon initial start-up of the system a spool piece should be installed in place of the flowmeter so that
purging of the system can be performed to remove all particle debris which could cause damage to the
meter internals. In applications where meter flushing is required after meter service, care should be taken
as to not over-speed the meter, as severe meter damage may occur.
Gas bubbles in the system will create measurement errors. These are purely volumetric meters.
Application Warnings:
Do not exceed the maximum temperature stated in the client data sheet
Do not exceed the minimum temperature stated in the client data sheet
Do not exceed the maximum pressure stated in the client data sheet. End user must ensure that a suitable
device is fitted to prevent it from being exceeded.
No pressure surges to be allowed exceeding the maximum pressure stated in the client data sheet.
Only when correctly installed should the system be started. Operability must not be compromised during
installation.
Misuse can be avoided. Please see the Essential Safety Requirements above.
Identified Hazards: Valves and pumps that induce shocks into the system etc.
Ensure glands are sealed and tightened, ensure Exd window is fully screwed down particularly in high
humidity areas
The customer should not change the fluid without notification as this may damage the meter or invalidate
PED certification (Pressure Equipment Directive).
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