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The following is a list of common
problems that can be encountered with a 682 meter, and possible causes and
solutions for them. |
A.
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PROBLEM: The meter allows product to
pass through it, but the register on the meter doesn't move. |
B.
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PROBLEM: The meter will not deliver
product and will not register. |
C.
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PROBLEM: The meter delivers more
product than what is registered. |
D.
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PROBLEM: The meter delivers more
product than what is registered. |
E.
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PROBLEM: The meter has excessive
knocking noise. |
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A.
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PROBLEM: The meter allows product to pass through it,
but the register on the meter doesn't move.
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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. |
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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. |
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3. |
The drive-gear coupling shaft (in the gear
plate under the register) is broken or pin missing. |
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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. |
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5. |
The post on the wobble plate inside the
meter has snapped off. When this happens, it usually indicates that air has been
pumped through the meter. |
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6. |
The connector on the piston assembly
inside the meter is broken, allowing product to pass. |
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B.
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PROBLEM: The meter will not deliver product and will
not register.
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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 that meter isn't necessarily the
problem. |
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2. |
On older style Tokheim 682 meters, there
is a back pressure valve on the discharge of the meter which can become stuck
shut. |
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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. |
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C.
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PROBLEM: The meter delivers more product than what is
registered.
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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. |
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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
(in this case, 0.2%), then repairs are necessary. |
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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. |
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D.
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PROBLEM: The meter
delivers more product than what is registered.
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1. |
The meter could have the wrong gear train
in its registers. |
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2. |
Check for leaks on the suction side of the
pump, including the pump seal. Air which is sucked into the system and pushed
through the meter would affect registration. |
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3. |
After eliminating these possible causes,
check the meter's repeatability, as outlined in problem C above. |
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E.
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PROBLEM: The meter
has excessive knocking noise.
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1. |
Check the calibrator on the meter. If it
is adjusted too far out, excessive knocking is possible. |
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2. |
If the problem isn't the calibrator, then
the meter valve or another internal part may need repair or replacement. |
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3. |
After eliminating these possible causes,
check the meter's repeatability, as outlined in problem C above. |
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