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Within this menu, use the Fwd and Back arrows to change between different options and to move about within each option, use Up and
Down arrows to alter settings. Date and time formats are specified using Setup Menu 5, Date and Time Formats. This guide is written using
the factory default settings.
Option 1, Date
This option allows you to set the date.
Option 2, Time
This option allows you to set the time.
Battery Voltage cannot be adjusted, but is displayed for reference.
8.10 Setup Menu 5, Date & Time Formats
Option 1, “Date”
Toggles between “MT/DT/YR” or ”DT/MT/YR” date format.
Option 2, “Time”
Toggles between “AM/PM” or ”24 Hr” time format.
Option 3, “Auto Off”
Toggles between “Enable” or “Disable” 65-minute auto-shut off.
8.11 Setup Menu 6, PTV and PTVM (formerly Leakage & Leakage Correction Factor)
There is a very small gap between the piston and the interior of the glass flow cylinder, allowing a known volume of gas to leak past during
calibrations. This is the underlying operating principal of the Sierra Cal=Trak, and what allows the elimination of fluid seals used in earlier
piston prover designs like the Sierra Cal=Bench. At low flows, the fixed leakage past the piston becomes a greater percentage of the overall
measurement uncertainty. The leakage of each individual flow cylinder is quantified at our factory using nitrogen, and entered into the
Cal=Trak as the Piston Tare Value (PTV), to be factored into subsequent readings. This is part of the factory calibration.
The Leakage rate is based upon the viscosity of nitrogen. For proper calibration with gases other than nitrogen (or air), the PTV multiplier
(PTVM)—factory-set to 1.000—allows the user to adjust the Cal=Trak to account for different gas viscosities. The PTVM is based upon
the difference between the viscosity of nitrogen and the viscosity of the gas under test, expressed as a ratio (PTVM = the viscosity of
nitrogen/viscosity of the gas being used). To optimize low flow calibrations of alternate gases, the user should determine this ratio and
adjust the PTVM as necessary. Note: since the Leakage rate is fixed for a particular flow cylinder, the use of a PTVM greater than 1.000