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Reference Manual
00809-0100-4444, Rev AC
Section 6: Advanced Diagnostics Configuration
January 2015
Advanced Diagnostics Configuration
4-20 mA deviation
The 4-20 mA deviation is a measurement of the percent difference between the simulated analog
signal and the actual measured analog signal from the analog output verification test. This value
can be continuously monitored using continuous SMART Meter Verification.
6.14 Optimizing the SMART
™
Meter Verification
The SMART
™
Meter Verification diagnostic can be optimized by setting the test criteria to the
desired levels necessary to meet the compliance requirements of the application. The following
examples below will provide some guidance on how to set these levels.
Example
An effluent meter must be certified annually to comply with environmental regulations. This
example regulation requires that the meter be certified to five percent.
Since this is an effluent meter, shutting down the process may not be viable. In this instance the
SMART Meter Verification test will be performed under flowing conditions. Set the test criteria
for flowing, full to five percent to meet the requirements of the governmental agencies.
Example
A pharmaceutical company requires bi-annual verification of meter calibration on a critical feed
line for one of their products. This is an internal standard, and the plant requires a calibration
record be kept on-hand. Meter calibration on this process must meet two percent. The process
is a batch process so it is possible to perform the calibration verification with the line full and
with no flow.
Since the SMART Meter Verification test can be run under no flow conditions, set the test criteria
for no flow to two percent to comply with the necessary plant standards.
Example
A food and beverage company requires an annual calibration of a meter on a product line. The
plant standard calls for the accuracy to be three percent or better. They manufacture this
product in batches, and the measurement cannot be interrupted when a batch is in process.
When the batch is complete, the line goes empty.
Since there is no means of performing the SMART Meter Verification test while there is product
in the line, the test must be performed under empty pipe conditions. The test criteria for empty
pipe should be set to three percent, and it should be noted that the electrode circuit health
cannot be verified.
LOI menu path
Manual: Diagnostics, Advanced Diag, 4-20 mA Verify, View Results
Continuous: Diagnostics, Advanced Diag, Meter Verify, Measurements,
Continual Meas, AO FB Dev
Traditional fast keys
Manual: 1,2,3,3,2
Continuous: 1,2,3,2,2,2, --
(1)
(1)To get to this value, the down arrow must be used to scroll through the menu list
Device dashboard
Manual: N/A
Continuous: 3,2,4,4,1