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Chapter 5
Troubleshooting
Table 5-1 lists the symptoms, possible causes, and recommended solutions
for common problems encountered with the VELOCICALC Plus. If your
symptom is not listed, or if none of the solutions solves your problem, please
contact TSI.
Table 5-1: Troubleshooting the VELOCICALC Plus
Symptom
No display
Display reads “LO”
Possible Causes
Unit not switched on
Low or dead batteries
Dirty battery contacts
Low battery charge
Wrong AC adapter
Low AC line voltage
Display reads
“CAL”
Display reads
“OVER”
Velocity reading
fluctuates badly
Display reads
“Err 6”
Display reads
“Err 5”
“nO rEF” is
displayed
Dirty battery contacts
The VELOCICALC Plus
has detected an internal
fault
The velocity, pressure or
temperature is too high
Sensible heat factor is
less than -1.5 or greater
than +1.5
The flow is fluctuating
Low lithium battery
Datalogging RAM is
inoperable
Not enough data has been
taken to calculate heat
flow
Corrective Action
Switch the unit on
Replace the batteries or
plug in the AC adapter
Clean the battery contacts
Replace or recharge
batteries
Replace with the correct
AC adapter
Correct the AC line
voltage or use batteries
Clean the battery contacts
Return to factory for
service
Use an alternate method
Take heat flow data again
Reposition the probe in a
less turbulent section of
the flow or use a longer
time constant
Return to TSI for
replacement.
Return to TSI for service
Refer to Heat Flow
section of Chapter 3 to
see what data is required
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