Badger Meter 7500 User Manual
fi
Coil
DC supply
Electrode
Flow
Liner
Magnetoflow®
Mag Meter
Model 7500P Meter
Installation &
Operation Manual
SCOPE OF THIS MANUAL
This manual contains information concerning the installation,
operation and maintenance of Badger's Magnetoflow® 7500P
Mag Flowmeters. To ensure proper performance of the meters
covered, the instructions given in this manual should be thoroughly understood. Retain the manual in a readily accessible
location for future reference.
DESCRIPTION AND OPERATION
Badger's 7500P Mag meters are intended for use in fluid
metering applications for process batching in Industrial plants
or concrete operations.
The 7500P Mag meter is a stainless steel flow tube with an
internal isolating lining. Two electromagnetic coils are located
outside the flow tube, diametrically opposed to each other and
protected by a carbon steel housing. Two electrodes, inserted into
the flow tube, are positioned "flush" with the internal diameter of
the tube and perpendicular to the coils. The coils are energized
by a pulsed DC voltage provided by the electronic converter,
and a magnetic field is generated across the flow tube section.
According to Faraday's law, when this magnetic field is "cut"
by the conductive liquid flowing through the meter, a voltage is
generated in the liquid. This voltage is directly proportional to
the liquid flow velocity, and therefore to the actual volumetric
flow rate of the liquid. The electronic converter measures this
voltage, processes the signal, and provides two digital pulse
outputs, scalable to the desired volumetric value. These digital
pulse outputs can be connected to a batch controller, a totalizer display unit for monitoring purposes, or to both devices
simultaneously. Magnetoflow® 7500P operation is not affected
by the presence of suspended solids in the liquid. Variations of
liquid temperature, viscosity or density have no influence in its
principle of operation. A set of convenient, field proven pulse
scaler rotary switches are provided for easy and straight-forward
batch accuracy compensation.
BadgerMeter,Inc.
IOM-075-04
Part No. 53400-075
3-09
UNPACKING AND INSPECTION
To avoid damage in transit, Badger meters are shipped to
the customer in a special shipping container. Upon receipt
of the meter, perform the following unpacking and inspection
procedures. If damage to the shipping container is evident, be
present when the meter is unpacked.
A. Carefully open the shipping container following any instructions that may be marked on the container. Remove all cushioning material surrounding the meter and carefully lift meter
from container. Retain the container and all packing material
for possible use in reshipment or storage.
B. Visually inspect the meter for any physical damage such as
scratches, loose or broken parts, or any other sign of damage
that may have occurred during shipment.
NOTE: If damage is found, request an inspection by the carrier's agent within 48 hours of delivery. Then file a claim with
the carrier. A claim for equipment damaged in transit is the
responsibility of the customer.
STORAGE
If the meter is not to be installed right away, store it in it's original
container in a dry, sheltered location. Storage temperature: -4
to 158°F (-20 to +70°C)
The model 7500P mag is designed to measure flow in one direction only. Carefully observe the "forward flow" label attached
to the meter body and install the meter accordingly.
If horizontal piping orientation is required, the detector should
be mounted in a position at which the electrodes axis will
remain in an horizontal plane (3 and 9 o’clock position; see
figure below).
FIG. 2
HORIZONTAL INSTALLATION
ELECTRODES ORIENTATION
METER INSTALLATION
METER ORIENTATION
Magnetoflow Mag Meters can operate accurately in any pipe
line orientation.
However, the most recommended installation position is vertical
piping, with the the liquid flowing upward.
FIG. 1
VERTICAL PIPE MOUNTING
HIGHLY RECOMMENDED
PIPING CONFIGURATION
Appropriate piping arrangements should be provided to ensure
the meter is not exposed to extreme pipe vibrations. The piping
arrangements should include appropriate pipe supports.
For optimum accuracy performance, it is required to provide
sufficient inlet and outlet straight pipe runs. An equivalent of
3 diameters of straight pipe is required on the inlet side of the
meter, and 2 diameters on the outlet side, measured from the
center of the meter body.
Avoid installing the detector close to flow disturbance generating valves and fittings.
Do not install the detector in the outlet side of Piston or Diaphragm type pumps. Avoid all pipe locations where the flow
is pulsating. Avoid installing the detector in the suction side
of any pumps; possible creation of vacuum can affect meter
performance or cause damage to the PTFE liner.
TEMPERATURE
Note: Environmental temperature of installation is not to exceed
maximum specification of 122°F (50°) for the meter.
This installation practice ensures two objectives:
· The pipe remains completely full of liquid, even at low flow, low
pressure applications with a discharge to the atmosphere.
· Solid build-ups or sediments that could be part of the process fluid will not deposit or accumulate on the liner and/or
electrodes.
2
PIPING CONFIGURATION
WRONG
RIGHT
FLOW
FLOW
FLOW
WRONG
FLOW
RIGHT
Protective Grounding Rings
Good Local
Earth Ground
Protective Grounding Ring
(ANY POSITION)
STRAIGHT PIPE RUN
PUMP
CHECK VALVE
NEEDLE VALVE
GLOBE VALVE
(FULLY OPENED)
GATE VALVE
BALL VALVE
TEE
ELBOW
NO PUMPS
ANY VALVE
TEE
NO REQUIREMENT
PIPE REDUCERS
5-7 D
2 D3 D
ELBOW
UPSTREAM
DOWN STREAM
GROUNDING
Proper grounding is vital to ensure a good mag meter operation.
To ensure proper grounding, the 7500P mag meter is provided
with a set of protective grounding rings. The rings also serve
as protection for the liner.
The main purpose of the ground connection is to provide
electrical continuity between the liquid media, the amplifier’s
input ground or zero voltage reference, and a good, solid earth
ground.
PARTIALLY FULL PIPE SITUATIONS
Magnetoflow® meters are designed to operate in closed, full
pipes.
It is relatively common to encounter situations where the process pipe will remain momentarily partially filled due to certain
hydraulic conditions. Examples of this include discharge to the
atmosphere (lack of back pressure), insufficient line pressure,
gravity flow applications, etc. (see figure above)
To eliminate the negative effect of these situations on the performance of Magnetoflow® meters, a few guidelines should
be observed:
· Avoid installing the detector in the highest point of
the pipe line.
· Do not install the detector in vertical, downward flow
sections of the pipe.
· On-Off valves should ALWAYS be located on the
downstream side of the detector.
· Select the recommended vertical orientation when
ever possible.
· Make sure the selected detector size complies with
the application flow rate. Do not oversize pipe line
and detector size.
Connect a grounding strap to a solid, local earth ground (tower
structure or pipe support) (see illustration). It is recommended
to use copper wire, at least gauge AWG 12.
When installing meter, also use standard gaskets to avoid
leaks.
3
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