TCS 682-15, Руководство по обслуживанию, Страница: 11 / 24

TROUBLE SHOOTING THE 682 METER
The following is a list of common problems that can be encountered with a 682 meter, and
possible causes and solutions for them.
A.
PROBLEM: The meter allows product to pass through it, but the register on the meter
doesn't move.
1) Check the reset knob on the register. On older style Veeder Root registers, this knob can become stuck-in,
which will disengage registration. In this case, though, the totalizer would still register.
2) Check the screws that hold the gear plate onto the bottom of the register. If they become loose, neither the
register nor the totalizer will register.
3) The drive-gear coupling shaft (in the gear p late under the register) is broken or pin missing.
4) The retaining ring on the counter drive gear has come off or broken, allowing the drive gear to disengage
from the drive shaft gear assembly.
5) The post on the wobble plate inside the meter has snapped off. When this happens, it usually indicates that
air has been pumped though the meter.
6) The connector on the piston assembly inside the meter is broken, allowing product to pass.
B.
PROBLEM: The meter will not deliver product and will not register.
1) Check any air eliminator and/or strainer screens in the system for blockage. Also, check all valves in the
system for proper operation. If the problem still hasn't been discovered after those checks, determine what
the pressure is before and after the meter (with the pump running). Equal readings would indicate the
meter isn't necessarily the problem.
2) On older style Tokheim 682 meters, there is a back pressure valve on the discharge of the meter, which can
become stuck shut.
3) If it is determined that the problem is in the meter itself, then the meter valve (inside the meter) is stuck
down onto the valve body.
C.
PROBLEM: The meter delivers more product then what is registered.
1) First, the meter should be tested for repeatability. To test repeatability, run a fast (high gallons per minute)
test in your prover and record how much the meter is under registering. Do NOT change the meter's
calibration. Then, run a slow (low gallons per minute) test and again record the amount that the meter is
under registering
2) If the results from the fast and the slow test are the same or close to the same, the meter has repeatability
and can be calibrated. If the test results differ beyond the rated tolerance of the meter, then repairs are
necessary.
NOTE: If the meter is more than 7% inaccurate (register reading of 4.65 or less gallons in a 5 gallon test),
then it cannot be calibrated until repairs are made.
D.
PROBLEM: The meter delivers less product then what it registers.
1) The meter could have the wrong gear train in its regis ter.
2) Check for leaks on the suction side of the pump, including the pump seal. Air, which is sucked into the
system and pushed though the meter would affect registration.
3) After eliminating these possible causes, check the meter's repeatability, as outlined in problem C above.
4) Register may need repair.
E.
PROBLEM: The meter has excessive knocking noise.
1) Check the calibrator on the meter. If it is adjusted too far out, excessive knocking is possible.
2) If the problem isn't the calibrator, then the meter valve or another internal part may need repair or
replacement.