Sierra 730 - Manual (Page 11)

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