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Idiomas disponibles
Idiomas disponibles
Periodic Inspection
Visually inspect the flow meter for missing hardware, loose or leaking connections, broken register glass, or other signs
of wear or deterioration. Repair or replace components as required.
Cleaning
Clean all dust, dirt, grease, moisture, or other foreign materials from the exterior of the flow meter and any applicable
accessories.
The following instructions are for removal, inspection, and installation of flow meter parts or assemblies. Refer to
illustrations on the parts / kits list (pages 6-8) for component numbers. The TN series meter is designed to be easy to
service, with the meter body remaining
Meter Assembly
1. Shut off flow to the meter. Place a container under the meter of sufficient size and correct material to capture any
fluid that escapes during pressure relief and removal.
2. Open the Manual Bypass Valve (see diagram page 3)
3. Disassemble the meter by removing the reset knob on the side of the meter, then remove the two Phillips head
screws holding the register housing (#4 on diagram page 6). This will allow access to the register (item #3) to
service those components.
Condition
Liquid is flowing slower or has
stopped flowing.
Cracks in control plate
assembly.
Leakage from meter cover.
Liquid is flowing but flow is
not registering.
Liquid is flowing but register
is not reading correctly, %
error is constant.
Liquid is flowing but register
is not reading correctly, %
error fluctuates.
Troubleshooting
Probable cause and Solution
Clogged strainer upstream of the flow meter. Clean strainer.
•
Partially or fully closed valve upstream or downstream of flow meter. Open valve.
•
Malfunctioning valve upstream or downstream of flow meter. Service valve.
•
Pump failure. Service pump.
•
Meter jammed by foreign particles. Clean meter and add strainer upstream.
•
Meter frozen by chemicals or water seepage into the meter. Open meter and clean components;
•
inspect for damage and repair as necessary.
Drive gear has come unscrewed from flow meter being operated with flow reversed. Replace
•
damaged components and reinstall flow meter to insure correct flow direction.
Pump bypass not adjusted properly. Re-adjust as necessary.
•
Overspeeding or water hammer conditions.
•
Seal has been damaged, usually due to:
Shock pressure. Replace seal and inspect cover for damage.
•
•
Seal has been pinched or nicked. Replace seal (PTFE seals should be replaced anytime the
meter is opened).
•
Chemical attack. Check seal material against liquid for compatibility. Replace seal as required
with compatible seal.
Cover bolts not tightened sufficiently. Re-torque as necessary.
•
Drive gear has come unscrewed from flow meter being operated with flow reversed.
•
Reassemble drive train and reinstall flow meter to insure correct flow direction.
A large error indicates register is not calibrated correctly or is calibrated in a different volume.
•
Check gearing in the gear plate assembly.
A smaller error can be the result of failure to not being calibrated to the fluid being metered or
•
meter wear. Check calibration per instructions on page 3.
Air in the lines. Check system design and correct as necessary.
•
Meter may have been damaged by a shock condition, stripping gear teeth on cover plate
•
assembly. Inspect and replace cover plate assembly as necessary.
Servicing
5
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