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24
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Chapter 3: Determining a reference value
Before you test a string
•
Note the voltage of the jars
•
Determine a reference value
•
Set options in the UTILITIES SETUP menu
•
Set test parameters in the BATTERY SETUP menu
Reference values are average conductance values from a sample of strong jars similar in condition
and age. Generally, a sample of 30 new or healthy batteries is tested to obtain a value representative
of a new online battery 90 days after installation. You can compare reference values to test results
from a string. The differences between test results and reference values help you determine the
string’s capacity to provide enough conductance for the load. Differences can re
fl
ect how a string
was treated, installed, or maintained.
Options in determining a reference value
If you want a value speci
fi
c to the string you are testing, Midtronics recommends that you create
your own reference value. The following options are listed in the order you should take to obtain a
reference value.
•
Consult your company documentation for reference values that were created for the string
you are testing.
•
Test a sample of jars. Refer to
Testing a sample of jars to establish a reference value
in this
chapter.
•
Test the jars in the string and use the highest conductance value as a reference value.
•
Use the average from STRING SUMMARY
after you test the string. Refer to
Using the aver-
age in STRING SUMMARY
in this chapter).
•
Use REFERENCE DEVELOPER to determine a reference value based on a selected per-
centage of jars on the string with the highest conductance value.
•
Use the reference value in the BATTERY MANAGER database for the model of jar you
are testing. If the model is not in the database, contact the battery manufacturer or visit www.
midtronics.com for a list of reference values for common jar types.
The reference values in STRING SUMMARY, BATTERY MANAGER, and on the website are only
guidelines. Midtronics updates the website with new reference values when they are created. If you
create a reference value for a jar model, e-mail the value and information to [email protected] or
fax it to 630-323-7752 (Attn: Reference value list).
CAUTION:
Do not use the Celltron ULTRA to test the entire string at once. Test only individual jars/
batteries.
IMPORTANT:
Always test on the lead post for the most consistent results. To prevent lower measures,
avoid tests on stainless-steel hardware or bolts.
Chapter 3: Determining a reference value
Celltron ULTRA
