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35
CHANGE
BACK
Norm T: 0.00
#C
DOWN
UP
Norm P: 760 mmHgA
Ref temp units
Ref pressure units
Stan P: 760 mmHgA
Stan T: 25.00
#C
>
Navigating and Customizing Your FP-25
Defining STP/NTP Reference Values
Standardized flow rates are reported in "standard" or "normal" volumetric
flow units that reference a given temperature and pressure combination (see
"Actual vs Standardized Flow Readings" on page 23). This reference is called
an STP (standard temperature and pressure) or, typically in Europe, an NTP
(normal temperature and pressure).
The FP-25 ships with an Alicat default STP equivalent to the US EPA's, 25°C
and 1 atm, and a default NTP of 0°C and 1 atm. Using the STP/NTP menu, you
can change the temperature or pressure references for both STP and NTP
separately. For example, you can change the NTP temperature reference to
15°C for use with IMPROVE network samplers.
To make changes, follow these steps:
1. Select the temperature or pressure
reference you wish to change using the UP and
DOWN buttons. Press CHANGE.
2. The current temperature or pressure value
will appear. Change the value, or press CLEAR to
restore the Alicat default. When ready, press SET.
3. At the confirmation screen, press SET again
to confirm your desired change.
Basic Configuration |
STP/NTP
CHANGE Enters the value or
unit selection screen for the
selected parameter.
BACK Returns to the Basic
Configuration Menu (page 34).
Stan T: Standard Temperature
Stan P: Standard Pressure
Norm T: Normal Temperature
Norm P: Normal Pressure
25.00000
Ref Temperature:
#C
SET
CLEAR
BACK/
CANCEL
SELECT
DIGIT
DOWN
UP
>
SET
CANCEL
PRESSING SET
WILL AFFECT
DEVICE MEASUREMENTS.
VERIFY THAT THE
CHANGE IS DESIRED.
Ref temp units Changes the
temperature units used for
STP and NTP calculations.
Ref pressure units Changes the
pressure units used for STP
and NTP calculations.