Badger Meter Positive Displacement User Manual
MODEL B1750
POSITIVE DISPLACEMENT
FLOW METER
INSTALLATION & INSTRUCTION
MANUAL
8635 Washington Avenue
Racine, Wisconsin 53406
Sales Toll-Free: 800.235.1638
Phone: 262.639.6770 Fax: 262.417.1155
www.blancett.com
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TABLE OF CONTENTS
General Description ................................................................ 4
Installation ............................................................................... 4
Flow Meter Guidelines for Paint Operations ....................... 8
Typical Automated Cleaning Cycle ..................................... 10
Calibrations ........................................................................... 12
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Troubleshooting Guide .........................................................
Statement of Warranty .........................................................
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GENERAL DESCRIPTION
The Blancett B1750 positive displacement gear flow meters are
similar in design to the gear pump. The principle of operation is
reversed; instead of the gears driving the medium, the medium
drives the gears. A non-intrusive magnetic pick-up or hall-effect
sensor detects the movement of the gear and as each gear tooth
passes the sensor a square wave pulse is produced and a discrete
volume of liquid is measured. The resulting pulse train is
proportional to the actual flow rate and provides a highly accurate
representation of the fluid flow. All meters are designed with
highly wear resistant moving parts to provide exceptionally long
service life.
Filtration:
Depends upon model.
Fluid Compatibility:
The materials of construction include stainless steel or high
strength aluminum housings, stainless steel gears and either
tungsten carbide or stainless steel bearings (depending upon the
model). The fluids should be compatible with these materials.
INSTALLATION INSTRUCTIONS
The preferred flow direction is etched or marked by an arrow on
the meter as this is the flow direction in which the meter was
calibrated. However, the flow meters have bi-directional flow
capabilities. Damage will not occur from reverse flow, but the
meter will count reverse flow as forward flow. To prevent this
possibility, an in-line check valve may be a consideration.
The preferred orientation is to mount the meter vertically;
although horizontal mounting is acceptable if conditions deter
vertical orientation. There is no need for straight run piping
upstream or downstream of the flow meter.
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Figure 1
Install the meter upstream from control valves and fluid
regulators if possible. See Figure 1. Back pressure from control
valving is beneficial for stable running.
Eliminate all dirt, debris and metal shavings from the piping as
the liquid must be free from any particles larger than allowed by
the manufacturer’s specifications. Any recommended filtration
should be installed before operation as potential plugging most
often occurs at startup.
If possible, install a by-pass around the meter and flush existing
piping with the appropriate solvent before first use. See Figure 1.
Review the pick-up instructional guide prior to installation.
Locate the pick-up and wiring away from A/C motors, actuators,
heaters, relays, etc. Use only shielded cable and do not take
power from the same circuits as other devices. Ensure clean
power supplies which utilize a true earth ground. Intrinsic safety
barriers must be installed if the circuit is intended to be
intrinsically safe.
The pick-up sensor should only be installed hand tight - do not
use wrenches or channel locks. Over tightening may cause a
dimple to protrude into the meter chamber beneath the pick-up
and interfere with the free gear rotation.
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Maintenance Guides are provided with the meter and are also
available from the factory. These should always be reviewed by
personnel prior to attempting any maintenance work. The
overwhelming majority of downtime and repairs are the result of
breakages due to improper maintenance actions, lack of training
or rough handling.
Never run the meter dry or spin with air only. Gear flow meters
are precision engineered flow devices and should always be
maintained in a clean, lubricated condition with the internals wet
at all times. Air and water should not be allowed in contact with
the internal parts except in short (1-2 second) cycles as part of an
automated flush.
Do not use water for flow testing. The viscosity of water is too
low to produce accurate results unless the flow rate is elevated,
and the internals would then have to be dried and lubricated to
avoid corrosion or scaling. Using a fluid with a viscosity of
approximately 30 cSt, such as mineral oil or thinned glycerin, is
recommended if calibration of the system is necessary. The
preferred calibration fluid would be the actual fluid to be metered.
Do not ramp-up flow to a full flow condition instantaneously.
Gear flow meters are rugged, yet precise instruments which will
respond almost instantaneously to changes in fluid flow. Normal
pulsating flows will not damage the meter and will merely cause
the output to be unsteady. However, if flow is repeatedly cycled
from zero to full flow instantaneously, fluid shock forces may be
significant and may produce premature damage or wear over
time. To avoid damage to the system, ramp-up to maximum flow
over a few seconds rather than instantaneously and do not inject
high flow speeds into an empty meter.
Filtration is recommended to prevent contaminants from entering
the meter. Should the meter become plugged, a reduced flow
may still be observed from the outlet as fluid pressure will
squeeze fluid through the meter. Visual flow does not necessarily
mean that the meter’s gears are turning. If plugging is caused by
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contaminants, then filtering should be installed. If plugging is
repeatedly caused by particle build up, then review the cleaning
and maintenance procedures in the following section. Because of
the vast differences in fluid types and in-plant procedures, there
may be some trial and error involved in determining the ideal
flushing or cleaning regimen.
A calibration factor (K-factor) is established at the factory on a
preferred calibrating fluid. This number is usually accurate for a
wide variety of fluids and should not usually be changed. It is
provided with the meter either on a Calibration Data Sheet or on a
tag attached to the meter. Should it be lost, a copy can be
obtained from the factory. A calibration verification procedure is
detailed later in this document.
Storage - when the flow meter is idle or stored for any extended
period of time, the internals should be thoroughly cleaned with
the appropriate solvent, lubricated with a light oil and the ports
capped or plugged to prevent drying.
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FLOW METER GUIDELINES
FOR PAINT OPERATIONS
Before installing, operating or attempting maintenance on a flow
meter read the appropriate Maintenance Guide. As with any
precision engineered device, the equipment should always be
operated and maintained in accordance with the manufacturer’s
instructions.
Flow meters are designed to flow liquids which assist in cooling
and lubrication. Meters should always be closed to air except
when air is part of an automated purge cycle. In this case the air
segments are typically under 1-2 seconds and are interspersed
with lubrication solvent to achieve a scrubbing effect. The air
segments are short enough that the meter doesn’t dry out. See
Figure 2. Do not dry paint lines using only pressurized air as
this will lead to premature wear.
Figure 2
At the end of a shift or overnight, it is strongly recommended that
cleaning solvent or DI water with appropriate cutting agent be left
in the meter, under pressure, to soak. This helps keep unflushed
residual paint from drying and helps subsequent start-ups.
Opening a meter after a flush cycle will help determine if the
meter is being cleaned thoroughly by the purge.
Regular cleaning cycles with solvent or DI water may be
necessary to effect color changes or to prevent some coatings
from depositing on critical internal parts. Designing and
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