9.2 Meter factors
Meter Factor is a gain adjustment that may be needed to adjust for installation effects
caused by less than ideal straight run piping or if pairing the 8782 with an 8707 instead of
with a MS sensor.
The procedure is very similar to Vortex and Coriolis and is entered as a flow multiplication
factor of the range 0.2 to 1.8. Not all installations will require a Meter Factor and the 8782
will have a stable flow rate without a Meter Factor. If replacing an existing legacy
transmitter, a Meter Factor will enable the 8782 to match the legacy transmitter flow
reading if there is a discrepancy.
Performing an auto zero trim is recommended for best performance on the 8782. If an
auto zero trim is performed at any time after entering a meter factor adjustment, the
meter factor will need to be re-calculated and re-entered post auto zero trim or else
accuracy could be impacted.
Meter Factor = Actual Flow Rate (from 8712H) / Current Flow Rate (From 8782)
Example:
• The known actual flow rate is 100 GPM.
• A newly installed transmitter reads a flow rate of 1150 GPM after auto zero.
Remedy:
1. Perform a Meter Factor calculation of 100/115 = 0.8696.
2. Enter a Meter Factor of 0.8696 into the transmitter.
Note
Four decimal places are available to avoid rounding errors.
Result:
• The transmitter now reads 100 GPM
9.3 Licensing and enabling
All advanced diagnostics are licensed by ordering option code MV or DS1. In the event that
a diagnostic option is not ordered, advanced diagnostics can be licensed in the field
through the use of a license key. Each transmitter has a unique license key specific to the
diagnostic option code. A trial license is also available to enable the advanced diagnostics.
This temporary functionality will be automatically disabled after 30-days or when power to
the transmitter is cycled, whichever occurs first. This trial code can be used a maximum of
three times per transmitter. See the detailed procedures below for entering the license
key and enabling the advanced diagnostics. To obtain a permanent or trial license key,
contact an Emerson representative.
9.3.1
Licensing the diagnostics
1. Power up the transmitter.
2. Verify the software version is 7.1.1 software or later.
Advanced Diagnostics Configuration Reference Manual
November 2019 00809-0100-8782
90 Rosemount
®
8782 Slurry Magnetic Flow Meter Transmitter with HART Protocol
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