Badger Meter M-Series M4000 - Manual (Page 30)

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Mandatory, routine or scheduled maintenance should not be
required for the Badger
® M-4000 Mag Meter electronics or
fl ow tube after proper installation.
However, some occurrences may require personnel to
perform the following:
·
Flow Tube and Electrode Cleaning
· Fuse Replacement
· Amplifi er I&C Card Stack Replacement
These maintenance procedures are discussed in this section.
Disconnect main power to the unit before attempting any
device maintenance or cleaning.
Do not clean components inside the amplifi er or junction
box.
Flow Tube and Electrode Cleaning
At times fl ow tube, electrodes, amplifi er/junction box
housings and the amplifi er window may need periodic
cleaning, depending on process fl uid properties, fl uid fl ow
rate and surrounding environment.
Clean the fl ow tube and electrodes by following the
material handling and cleaning procedures documented
in MSD Sheets for the products(s) that were in contact
with the fl ow tube and electrodes.
Should fl ow tube and/or electrode cleaning become
necessary:
1. Disconnect detector from pipeline.
2. Clean electrodes with isopropyl alcohol or fresh, clean
water depending on the chemical compatibility of the
measured fl uid.
3. Reconnect detector to pipeline
Fuse Replacement
Disconnect main power to the unit before attempting any
device maintenance.
Risk of electrical shock. Replace fuse ONLY with the
same type and rating.
Authorized personnel must perform fuse replacements.
Replace fuses with fuses of the same ampere rating and
type. Refer to wiring diagrams when ampere ratings are
unknown or questionable.
Detector coil and incoming amplifi er power supplies are each
protected by a fuse in the amplifi er.
MAINTENANCE
Detector coils are protected by a 630mA, 250VAC, slow blow
fuse, part number 65621-001.
Incoming amplifi er power is protected by a 500mA, 250VAC,
slow blow fuse, part number 65621-002.
Fuse ratings are listed on the circuit board, next to the fuse
holders. Refer to the M-Series™, Model M-4000 Repair
Parts List (IRP-211-01).
To access and replace fuses:
1. Remove display chamber cover. Turn the cover
counterclockwise to remove it from the amplifi er. If
necessary, use a strap wrench.
2. Remove the 2 display card screws and washers.
3. Tilt card up/out approximately 45 degrees at the holding
clips.
4. Fuses are in the round/black fuse holders. Use a fl at
screwdriver to turn the holder cap counterclockwise until
the lock tab reaches the opening and the holder and
fuse disengage.