User manual

Smart Interface User Manual
IM-SIP-B 21
Run System Validation
System validation is a method of confirming that the entire system is
performing to the original factory specifications. You will need the
following equipment to perform the validation procedures:
• certified digital multimeter with minimum 4 character resolution,
accuracy of at least ± 0.1% of range
• small pot adjusting tool (screwdriver)
The validation procedure consists of four steps:
D/A Output Validation confirms that the analog outputs are within
factory specifications. This is achieved by driving the analog output
to a zero condition and then a full scale condition while monitoring
the results with the digital multimeter. (This mode is also useful for
validating any attached data acquisition device as well as the Smart
electronics.)
Electronics Validation confirms that the system has maintained the
capability to output the correct value corresponding to the original
factory calibration. This is achieved by applying a voltage to simu-
late flow from 0% to 100% of user full scale and verifying the re-
sults with the digital multimeter.
Sensor Validation confirms that the sensors have not drifted over
time by measuring the resistance of both sensors. This procedure
requires removing power from the flow meter. Sensors are validated
by removing power and measuring the resistance of each sensor.
Since the sensors are PT elements and are in close proximity to one
another, it is assumed that the measured temperature of the two will
match within 10 degrees centigrade. If the sensors are within 10 de-
grees C of each other, they are assumed to be in the same condition
as when they left the factory. (Before validation, perform a visual
inspection and cleaning if you suspect the sensors are coated by par-
ticulate matter.)
The Report command provides a file and printed report of the vali-
dation test results in either an ASCII or graphic format.
Caution!
During the validation pro-
cedures the output of the
flow meter will be forced
from the zero condition to
the full scale condition.
Make sure that any moni-
toring system is in manual
mode during validation.