It is assumed in this section that flowmeter has already been
installed. (for installation details refer Sect. 2+3)
Following are some trouble shooting hints.
SYMPTOMS:
Display is blank.
·
DC Supply voltage (between term. 5/6) is not
available (voltage range 12-36 Vd.c).
·
Supply connected with reverse polarity
Important: Ensure that the screw threads of the covers on
the electronics and connection compartments are well
greased at all times
·
Electronics faulty
SYMPTOM:
Current output is not proper.
·
Check current output electronics (refer Sect.7.2.3)
·
Check that current output loop resistance is less
than Rmax specified by Section 3.3.2
SYMPTOM:
Pulse output is incorrect
·
Check the Pulse output electronics (refer Sect.7.2.4)
·
Check programming of pulse output. (Functions
Fct1.3.x
)
·
Check that pulse output is not overloaded. For load
ratings of pulse output refer Sect.3.3.3.
SYMPTOM:
Non zero flow indicated when no
actual flow in the pipe.
·
Mains
interference
due
to
improper
earthing.
The
protective
earth
PE
terminal
should
be
properly grounded.
·
Excessive mechanical vibration in the pipe.
If so, support the pipeline near the flowmeter
perpendicular to both the axis of pipe and the axis
of bluff body.
SYMPTOM:
Flowrate indicated is 0.0 even with flow in
the pipe.
·
Vortex sensor cable disconnected or not properly
connected.
·
Flow sensor faulty – some checks are given in
Sect.7.1.1
·
Electronics faulty (preamplifier)
·
Fct. 3.3.4
Gain too low: Set gain to value of 5 or greater &
check.
SYMPTOM:
Fatal error
INV. CONFIG
(invalid
configuration)
·
Configuration data in the non-volatile memory is
inadvertently corrupted. Go to the programming
mode and recheck (reprogram, if necessary) all
the settings. If error persists contact Forbes Marshall service.
SYMPTOM:
Display contrast is progressively Fading.
·
Never expose display directly to the sunlight!
Install a sunshade if necessary.
SYMPTOM:
Flow indicated responds to changes in flow
but indicated value does not correspond to actual flow
rate.
8. Trouble shooting hints
·
Check programming of
Fct.3.1.2 K-Factor
which should be
same as on the nameplate.
·
Meter not properly centered on the pipeline. The axis of
meter bore should be aligned with that of pipe.
·
Gaskets at the meter are protruding into pipe bore.
Gaskets must not project into effective cross-
section of the pipe.
·
Irregularities on the surface of the pipe bore.
The pipe bore should be free from irregularities
at the welded joints, dirt, deposits and excessive
surface roughness.
·
Vortex signal is falsified due to a bi-phase medium.
Bi-phase media are not permitted. Use a moisture
separator for wet steam applications to remove
moisture droplets from the steam. Use suitable
filters
in
gas
applications
to
remove
solid
particles from the flowing gas.
·
Incorrect
angular
position
of
the
meter
Refer to Sect.2.1 (1) for allowable mounting positions.
·
Insufficient upstream / downstream pipe lengths.
Check that upstream / downstream pipe lengths are of
correct minimum length as given in Sect.2. 1(3).
·
Check the flow direction & direction of arrow on
the primary!
27
Содержание VFM 1091
Страница 1: ...4 2001 Vortex flowmeter Installation and Operating Instructions VFM 1091 I...
Страница 12: ...12...
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Страница 30: ...Certificate number of VFM 1091 I Ex FM CSA PTB approvals are pending 30...
Страница 31: ...31...
Страница 32: ...32...
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Страница 38: ...Dimensions and weight VHF 1091 I F Primary head flanged versions same as for VFM 1091 I K versions 38...
