Badger Meter Vortex Meters - Manual (Page 27)

Form No. 09-VRX-UM-00007 25
MAINTENANCE
This flow meter requires no maintenance in normal service if properly installed. If the flow tube should
become clogged with debris, it will be necessary to remove the meter from service for cleaning. Signifi-
cant clogging will often result in high (up to 20%) and/or erratic output. Do not stick tools into the tube,
as this may permanently damage the vortex sensor. The vortex sensor can not be repaired in the field. To
clean the flow tube, run hot (up to 160 °F) soapy water into the downstream end of the flow tube. Large
objects jammed against the bluff body maybe dislodged by lightly tapping the upstream end of the flow
tube against a firm surface.
WARNING: Do not remove vortex meter during operation.
Always disconnect primary power source before inspection of service.
Do not tap the flow tube so hard that the threads, on threaded units, become damaged
A schedule of maintenance checks should be determined based upon environmental conditions and
frequency of use. Inspect the meter at least once a year.
The inspection should consist of performing visual, electrical, and mechanical checks on all components.
1) Visually check for evidence of overheating by noting discoloration of wires or other components.
2) Check for damaged or worn parts, especially the bluff body, or indications of corrosion.
3) Check for tight , clean electrical connections and that the device is operating properly.
TROUBLESHOOTING
If difficulty is encountered, locate the symptom most likely present and follow the appropriate instruc-
tions.
CURRENT LOOP
SYMPTOM - NO CURRENT OUTPUT
1) Place a DC voltmeter across the two terminal block screws. With the electronics module powered
there must be at least 8 VDC present. If there is less than 8 VDC, but more than 0 VDC, check the
power source for sufficient voltage to drive the loop, as shown on page 10, in Figure 8. If there is 0
VDC present check for a broken wire or connector in the loop.
2) Check for the proper polarity of the current loop connections.
3) Make sure the receiving device is configured to provide (source) current to the electronics mod-
ule.
SYMPTOM - ZERO FLOW INDICATION (4 mA IN LOOP).
1) Check that the flow is greater than the minimum specified for the particular size flow meter in
use. If the flow rate is too low, replace the flow meter with the proper size flow meter.
2) If the flow rate is sufficient, partially remove the electronic module. Check that the three pin con-
nector that connects the electronics module to the flow transducers is positively connected (See
Figure 18). If it is disconnected, align and insert the connector on to the bottom of the electronics
module.