Troubleshooting
Page 23
June 2017
VRX-UM-02233-EN-02
TROUBLESHOOTING
Screen is blank (No display)
Verify that you have 24V DC .
Verify that power polarity is correct (Black +24V DC & Blue -24V DC) .
Screen shows no flow rate
during flow
Check arrow and alignment hole on the top of the probe . They must be pointing down the
pipe in the direction of flow .
Take a measurement from the top of the stainless steel probe to the top hole in the center
of the pipe . The overall length of the meter from the shedder bar to the hole is XX . The
length of XX minus the length measured is the distance the meter is in the pipe . Make sure
the meter is in the center of the pipe and not sitting inside the valve assembly or close to
the inside wall of the pipe .
Flow rate is erratic
Check to see what is installed upstream of the flow meter . Other instruments or devices
before the flow meter can shed vortices of their own causing a disruption in flow reading .
Check to see if there are any valve, tees or elbows upstream of flow meter . If these items are
too close to the flow meter then they can cause disruption in flow reading .
Check to see what size hole is drilled into the pipe for insertion . If an existing hole larger
than 1 .5 inch was used, the larger hole can create turbulence directly above the flow sensor .
Flow rate seems incorrect
Review the program settings and make sure the correct line size is chosen for your
application . If this is a multi-variable MASS unit, make sure the correct pressure and
temperature is being displayed on the screen . If this is a fixed MASS unit, make sure the
correct operating pressure is entered into the electronics for calculations .
Table 12: Troubleshooting
Transmitters and replacement electronics are available . Please contact the factory for proper selection .
REMOVING VN2000 TRTNSMITTER ELECTRONICS
1 . Turn OFF power to the transmitter .
2 . Remove the enclosure lid .
3 . Remove the transmitter electronics:
a . Insert a standard screwdriver under one of the slits along the sides of the case .
b . Carefully put your thumb or finger under the end of the screwdriver
c . Using the end of the screwdriver as a lever, press down on the handle to move the transmitter slowly out of the case .
d . Repeat steps 3a, 3b and 3c for each slit until the case can be pulled out with the fingers .
e . Press down on the connector tab and pull straight out .
DO NOT TO BEND THE CONNECTOR. PULL IT STRAIGHT OUT. DO NOT PUT EXCESSIVE PRESSURE ON THE PLUG BECAUSE
DAMAGE TO THE PLUG OR CONNECTOR ON THE BOARD MAY OCCUR.
