Thermo Scientific TVA-1000B Instruction Manual - Geotech ...

Display Menus MI 611-185 – June 1996
route and displays the component tag number (Tag), equipment type (Eqp), equipment size
(Size), and leak definition (Max). If a reading has already been logged into memory for this
record, it will also be displayed followed by the words “LastLog.”
Route Entry Response Factor
A secondary response factor correction is based on the response factor associated with the current
route entry. This secondary correction adjusts the concentration reading for different
component measurements in the same route.
For example, let a route contain two entries, one for propane and one for methane. Assume
that propane has only half the detector response of methane. If each route location has a leak
of 100 ppm, a single response factor based on methane would produce a concentration reading
of 100 ppm for methane, but only 50 ppm for propane. The addition of a secondary
response factor allows each entry to be corrected for detector sensitivity. Thus, if the secondary
response factor is 1.0 for methane and 2.0 for propane, both route samples will read correctly
as 100 ppm.
Only the linear correction mode is used for the secondary route response correction:
Linear: FinalConc = RouteRF x BackConc
The secondary RouteRF is downloaded to the instrument as part of each route entry. This
factor is applied to both detectors, as it is expected that when operating in this mode, only one
detector will be used. Entries inserted by the instrument default to a RouteRF of 1.0.
Navigating the Route File
Selecting “Next” from the first logging mode screen will allow you to step to the next record
in the route. Selecting “Prev” will allow you to step to the previous record in the route. You
can also enter a tag via the keypad or barcode scanner and the TVA-1000B will automatically
skip to that tag if it is contained within the route. If the tag is not contained within the route,
a “TAG NOT FOUND” message will appear and you will be given the option to “Insert”
that tag into the route or “Exit.”
Logging Data
Once you have reached the correct tag for the component you wish to monitor, you may
select “Start log sampling” to begin recording data. The TVA-1000B will display the readings
from both detectors and begin counting down for the time interval selected in the SETUP
menu. The countdown is shown on the last line of the display:
FID 100.0 ppm
Tag: 12345
Eqp: PMP Size: 2.500
Max: 1000
65.5 PID
100.0 FID
Sampling: 5 s [Exit]
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