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Sierra 730 User Manual

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Series 730 Instruction Manual
IM-73-E
9
Problem
Possible Cause
Solution
Flow measurement is
erratic or fluctuating
Very erratic or non-uniform flow
Follow installation requirements
shown in Figure 2
Flow meter installed with less than re-
quired minimum pipe diameters up-
stream and downstream of the sensor
Follow installation requirements
shown in Figure 2
Probe is not secured to a solid base
Secure probe to a non-vibrating solid
mount
Sensor component broken
Return to factory for replacement
Malfunction in system
electronics
Return to factory for evaluation
Moisture present in gas flow
Install a water trap or filter upstream
of the flow sensor
Velocity measurement
seems too high or low
Sensor assembly not aligned correctly
to flow
Correct alignment with the flow indica-
tor pointing downstream in the direc-
tion of flow
No response to flow from
sensor assembly
No power
Turn on power to the flow meter
Flow profile distortions
Try to find another location for the
meter
Extremely turbulent flow
Do not place the meter near a ventila-
tor, static mixer or valve
Sensor failure
Return to factory for repair
Malfunction in system
electronics
Return to factory for evaluation
System will not zero
Out of calibration
Return to factory for calibration
Probe tip is broken
Return to factory for repair
4-20 mA output circuit not
indicating 4 mA at zero
flow
Improper current loop resistance; total
current loop resistance must be no
less than 150 Ohms and no greater
than 450 Ohms
Install load resistor or use larger
gauge wire
Output pegs plus or minus
Flow body not plugged in
Plug in both connectors
Malfunction in system
electronics
Return to factory for evaluation