The system comes from the factory with a .2 neutral density verification filter. The filter has a known
value of opacity. This opacity value is stored in the system and is used to verify the system is
functioning properly. On a periodic schedule, run the filter test from the main menu. Follow the
instructions displayed on the HC. Once the filter test is complete, the program will indicate if the
system is reading opacity within tolerance of the filter value.
NOTE:
Each filter is unique and has its own value. If you have multiple systems at your location,
keep each filter assigned to its original meter. If you swap filters from one system to another, the filter
verification test may fail.
NOTE:
The full flow system does not include a zero filter. When the system prompts the user to insert
the zero filter, just ensure that the sensor head is not in the flow of exhaust and that the band clamp is
not blocking the beam.
Ambient Conditions Calculator
The HC has ambient conditions sensors located on the bottom side of the HC. These sensors record air
temperature, relative humidity, and barometric pressure. The user has the ability to enable or disable
ambient corrections on the measured opacity. If the user enables ambient correction, then the printout
will display the corrected opacity value.
Printing Saved Tests
The system can store up to 128 tests. There are multiple ways in which you can search for and print
stored tests. Power on the unit and select Saved Test Searches from the main menu. The user can
search for last record, record number, company name, plate number, or inspector. Enter the first few
letters or numbers and then press enter. The system will search the database and display all records
that match the search parameters. Then select the appropriate record you wish to print.
11
