22
Troubleshooting and Maintenance
Troubleshooting
If you run into trouble with installation or operation, get in touch with support (
General Use
Issue:
My device does not turn on, or has trouble staying on.
Action:
Check power and ground connections. Please reference the technical specifications to ensure you have the proper
power for your model.
Issue:
The buttons do not work, and the screen shows
LCK
.
Action:
The flow meter buttons were locked out via a serial command (
[unit ID]
l
). Press and hold all four outer buttons
to unlock the interface.
Issue:
I can’t read the display easily.
Action:
During the day, you can increase the visibility of the display by increasing the contrast or brightness (
). For
monochrome displays under low-light conditions, push the bottom central button (located below the display) to turn
on the backlight.
Issue:
The analog output signal indicates values lower than what appears on my instrument’s display.
Action:
Analog signal voltage degrades over long distances. You can minimize this effect by using wires with a heavier gauge,
especially in the ground wire.
Issue:
How often do I need to calibrate my device?
Action:
Annual recalibrations are recommended. Check your device’s last calibration date by selecting
MENU
→
ABOUT
→
About
Device
. If it is time to recalibrate, request a recalibration from customer support (
Issue:
I dropped my device. Is it OK? Do I need to recalibrate?
Action:
If it turns on and appears to respond normally, then it is probably OK. It may or may not need a recalibration. Give it
a tare, and compare it against a known-good flow standard. If it checks out, keep using it, but tell us about the drop
at your next annual recalibration so we can check it out for you.
Issue:
How can I see readings in different units?
Action:
From the main menu, select
SETUP
→
Sensor
→
Engineering Units
. From this menu, you can adjust any variable’s
units. For more information, see
Flow Readings
Issue:
The live flow readings won’t settle down.
Action:
The device is very fast, so it can detect subtle variations in flow that may go unnoticed by your other devices. This
sensitivity can help detect problems with pumps or flow meters. You can lessen this sensitivity by increasing the flow
averaging (
Issue:
My flow readings are negative.
Action:
Under conditions of no flow, a negative flow reading can indicate a poor tare.
Issue:
Does the meter work if it is laying down? Will it be accurate?
Action:
Yes to both! The flow meter is internally compensated for any changes in orientation and can be used sideways, on
its back, or upside-down. Corrosive-resistant devices should be tared again after changing orientation.
Issue:
Can I put the flow meter on top of a vibrating device? Will it be accurate?
Action:
Yes. The device is internally compensated for any changes in orientation; however, sensor noise will increase if the
flow meter is vibrating.
Issue:
My meter does not agree with another mass flow meter I have in line.
Action:
Check the STP or NTP settings (
MENU
→
SETUP
→
Sensor
→
STP
/
NTP
Flow
Ref
) to ensure that your standardized
temperature and pressure references match those of your other flow calibrator. Also check that your device’s Gas
Select™ is set to the right gas or mixture.
Issue:
My flow readings won’t change when flow changes.
Action:
If your flow readings won’t change regardless of actual flow, your flow sensor may be damaged. Please contact support
to troubleshoot (
