Anderson HM150 Instruction Manual - Page 10

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Section 7 - Troubleshooting

HM FLOWMETER TROUBLESHOOTING GUIDE
PROBLEM
CAUSE
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No output or
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erratic output
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HT75000
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Poor
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accuracy/
repeatability
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Failed Probe (no output)
Probe not seated
Moisture and/or corrosion
in probe-to extension
cable connector
Flow rate too low
Obstructed Rotor
Incorrect wiring
Bad cable splice
No scale factor entered
Signal interface problem
Incorrect coil resistence
Air in system
Process flow rate out of
meter flow range
Obstructed Rotor
Probe not seated
Poor meter installation
Poor system hydraulics
Incorrect scale factor
Electrical noise
Changing product
characteristics density
and/or viscosity
Inaccurate proving
standard
Operating error – poor
testing method
Rotor wear
Damaged housing
ACTION
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Replace Probe
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Check probe: must be threaded to bottom
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Disconnect extension cable at probe for
visual check, dry or clean if required
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Check meter specification for flow range
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Check rotor (should spin freely)
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Check manual for correct wiring configuration
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Check color code and continuity integrity
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Check readout device scale factor
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Check signal input specs of receiving device
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Check black/white signal wires for 975Ω
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Add air elimination device
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Check meter specs for flow range info (adjust
flow rate or change-out meter)
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Check rotor (should spin freely)
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Check probe: must be threaded to bottom
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Locate meter in low spot (see installation)
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Backflow? (Install check valve) Valve closing
time?
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Check: scale factor, K factor and unit of
measure
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Check: shielding, separate signal from AC
wires
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Check: product weight, viscosity, scale
accuracy, control temp. Multiple products?
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Verify accuracy of proving standard (vessel/
scale)
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Observe test procedure
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Remove and inspect (figure: 6.4)
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Remove and inspect (figure: 6.5)