MAESTRO 60X714 control module card
Technical data of product parameters
frequency and temperature instrumentation). NIST-owned and controlled instruments (temperature, etc.) are used as part
of the test of a customer’s meter since these have established uncertainty values based on calibration records maintained
as part of NIST’s Quality System: http://www.nist.gov/qualitysystem/index.cfm. Such information is not available for the MAESTRO 60X714
customer’s instrumentation. Use of the customer’s instrumentation for a calibration or Special Test requires specific
arrangements with the NIST technical contact. Calibration of customer’s ancillary instrumentation is not part of the
calibration procedures described here and would require that separate arrangements be made.
Following calibration, meters are rinsed with ethanol and dried. This precaution avoids contaminating customers’ fluids
with water that remains in the meter and it prevents corrosion of any part of the meter that is incompatible with water.
Most meters can be simply rinsed with alcohol using a hand held squirt bottle, or capped, filled with alcohol, inverted
several times to fill and mix trapped volumes, and drained. Some meters (e.g. positive displacement meters) may have
crevices that retain water if not rinsed more aggressively. NIST rinses such meters in a recirculating flow of ethanol at MAESTRO 60X714
approximately 15 % of the maximum flow for a minimum of five minutes. During the rinse, the meter is installed so that
the RF or magnetic pickoff of the positive displacement meter is positioned downward. This precaution assures that all
water is removed from the relatively small cavity enclosing the pickup if the meter has such a cavity. There are multiple
acceptable ways to dry flow meters: 1) application of vacuum, 2) application of a stream of dry gas , and 3) by hanging MAESTRO 60X714
and waiting for draining and evaporation. For turbine and positive displacement meters, one end of the meter is capped
while vacuum is applied to the other for one hour. This method avoids over-spinning the turbine or PD meter that might
occur if too strong a stream of dry gas is applied. However, Coriolis meters are dried using a stream of dry nitrogen
because it is quicker and over-spinning is not a concern with this meter type. In the event that no vacuum or inert gas is
available, meters are hung to dry at various orientations for a minimum of three hours at each orientation to be sure all
void volumes in the meter have drained dry.
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