S A G E M E T E R I N G , I N C .
O p e r a t i o n s a n d I n s t r u c t i o n M a n u a l
62
REV. 03-SIE/SRE
degrees causes meter to over-report; a greater
rotation actually blocks the sensor, and causes
meter to under-report).
f) A downstream valve too close to the meter (flow
may be reflecting back).
g) Possibly caused by water droplets condensing out
of gas stream (which generally causes output to
spike; but if droplets are near continuous, output
may rail).
h) Meter is miswired, especially in Remote Style
application.
i)
Possibly caused by water droplets condensing on
inside of pipe wall, which roll down or hit sensor
causing output to spike; but if droplets are near
continuous, output may rail.
Note:
Recommend in -
stallation 45˚ from vertical (see drawing on page 73).
j)
Possibly caused by water droplets condensing out
of gas stream and filling the cavity containing the
sensing elements (usually due to probes mounted
below horizontal in saturated pipes).
k) Sensor may be contaminated. Remove probe,
wipe off or clean with a solvent. Reinsert.
l)
Using a different gas or gas mix than the meter
was specified and calibrated for.
m) If a Remote Style Meter (SRG), be sure Serial
Numbers of Junction Box and Remote Electronics
are identical (if not, errors in calibration are in -
evi table). To confirm, verify that Junction Box
Serial Number Tag has identical Serial Numbers
to Tag on Remote Enclosure.
n) Meter may appear to be reading high if user is
comparing Sage flow meter readings (SCFM) to
an uncorrected volumetric device (ACFM). For
example, at constant volume, a decrease in gas
temperature will increase the mass flow (SCFM).
That is completely normal.
SYMPTOM:
Reading Low
POSSIBLE CAUSES:
a)
Insufficient straight run (i.e. flow profile is
disturbed, causing errors).
b) Poor flow profile Upstream (insufficient upstream
straight run).
c)
Not following Probe Insertion Guideline.
d) If sensor is inserted in reverse (“Upstream” mark
is facing downstream) Meter may over-report (or
under-report) by as much as 30%.
e) If sensor is not aligned properly, with “Upstream”
mark facing upstream, a rotation greater than ± 5
degrees may cause change in reading (greater than
± 5 degrees and less than ± 20 degrees causes meter
to over-report; a greater rotation actually blocks
the sensor, and causes meter to under-report).
f) Sensor may be contaminated. Remove probe, wipe
off or clean with a solvent. Reinsert.
g) Using a different gas or gas mix than the meter
was specified and calibrated for.
h) If a Remote Style Meter (SRG), be sure Serial
Numbers of Junction Box and Remote Electronics
are identical (if not, errors in calibration are in -
evita ble). To confirm, verify that Junction Box
Serial Number Tag has identical Serial Numbers
to Tag on Remote Enclosure.
i) Meter may appear to be reading low if user is
comparing Sage flow meter readings (SCFM) to
an uncorrected volumetric device (ACFM). For
example, at constant volume, an increase in gas
temperature will lower the mass flow (SCFM).
That is completely normal.
j) On most models, the Totalizer will not start count-
ing for 10 seconds after power up so any flow data
will not be accumu lated during this time.
k) Insufficient 24VDC power supply—the SIG & SIP
require 350 ma to operate properly, or 250 ma
with back lite turned off (Menu item 707)
l) Excessive load on the 4-20 ma. (To check if prob-
lem is due to 4-20 ma output device, temporarily
remove device, and observe if display reads as
expected).
SYMPTOM:
Totalizer can take up to 10 seconds to
update its reading when flow meter is first powered
up, or a channel is changed.
CORRECTIVE ACTION:
None. This slight delay is com-
pletely normal.
SYMPTOM:
Display does not have power
POSSIBLE CAUSE:
Mis-wiring
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Страница 59: ...Section DIAGNOSTICS E ...
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