STORAGE INSTRUCTIONS
Short periods of non-use of the meter (a week or less) will present no problem, provided that the meter remains full
of product. For long periods of non-use, such as winter storage, the following procedure is recommended. Before
long term storage, a good practice is calibration of the meter to determine that it is functioning properly.
1) To store the meter when it is left in line, flush the system with clean water until 40-50 gallons of water have
gone through the meter.
2) Pump a 50% anti-freeze / 50% water solution through the entire system (100% RV antifreeze may be used
instead). With the pump running, shut off a valve downstream from the meter, making sure that anti-freeze
solution is present at that point. Then close an upstream valve, such that the meter remains full of anti-
freeze solution.
3) Remove the register from the meter, and lubricate the drive coupling shaft. After lubrication it, replace the
register onto the meter.
4) When starting the system after a period of storage, rechecking the meter's calibration as detailed earlier in
the service manual.
CALIBRATION OF THE 682 METER
A. It is important to test the repeatability and accuracy of your meter. To test repeatability:
1) Run a fast (high gallons per minute) test in your prover and record how much the meter is over or under
registering. Do NOT change the meter's calibration.
2) Run a slow (low gallons per minute) test and again record how much the meter is over or under
registration.
If the results from the fast and the slow test are the same or close to the same, the meter can be successfully
calibrated. If the test results differ beyond the rated tolerance of the meter, then repairs are necessary before the
meter can be calibrated.
B. A valve or nozzle must be at the end of the delivery hose (at the prover).
C. Turn on the pump and purge the system of air. Leave the pump on.
D. Shut off the valve at the end of the delivery hose and let the system pressurize.
E. Wet the prover and empty it, letting it drip for 30 seconds.
F. Reset the register on the meter to "0".
G. Fill the prover to the line marked "0".
H. Record what the register reads. Every1/10 gallon difference between the register and the 5 gallons known
to be in the prover equals a +/-2% inaccuracy. For example, a reading of 4.9 gallons on the register,
compared with a 5 gallon prover filled to the "0" line means the meter is giving away 2% of the product it
meters.
I. The top disc on the calibrator has a tab sticking up. The tab is marked with a "plus" and a "minus" sign.
This indicates "plus" product and "minus" product. By turning the disc in one direction or the other,
product delivery will be increased or decreased.
J. A full revolution of the disc will change the calibration of the meter 3%. Therefore, if the meter shows 4.9
gallons on the register, the disc should be turned 2/3 of one revolution (2%) in the minus direction, since in
this case we want less product through the meter (5 gallons passed through it in the test, and only registered
4.9 gallons).
K. Empty the prover and let it drip for 30 seconds.
L. Run a second test and make a fine adjustment; and then another test to check your fine adjustment.
M. Replace the pin into the disc, and seal it with the seal wire.
NOTE: If your meter has a mechanical or electronic preset, it should be set high enough so that it doesn't
affect the calibration process. Only a valve at the prover should be used to control the flow during
calibration.
