Eastern Petroleum Supplies Manufactured Master Meters
Still the
usual way of testing positive displacement meters accuracy is by means of proving tanks,
specially designed and built tanks of known capacity. These methods, when
carefully conducted by skilled operators, can be accurate, but they lay
themselves open to many errors. They are also slow and the equipment is
cumbersome.
The Master
Meter system has been designed to simplify the whole procedure of checking the
accuracy of a meter. In many applications this can be done with the meter under
test in its normal operating position, and the equipment is easily
transportable.
It cannot be emphasized too strongly that with
modern meters, repeatability is such, that it should be possible to carry out a
number of runs at the same speed and obtain consistent results. No meter, including a Master Meter, is accurate,
throughout its speed range, but provided it is consistent, and the variation is
known, at any given speed of reading of the Master Meter may be corrected by
the application of a factor. By using the electronic counter with the
linearization of the error curve, the Master Meter error is very near to zero.
The Master Meter consists of a standard series
P.D. Meter (mounted in a Carry Frame, mobile trolley, Road Going Trailer or
Skid Base). The direction of flow through the meter is indicated by arrows on
the meter manifold.
Master Meter Handbook Service Manual for Master Meters