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Appendix A. Supplemental Information
A.2 Typical Examples
The following examples show typical calculations based on the equations presented on the previous page.
A.2.1 Example 1
is provided with the MG-101 to enable you to use the field calibration system to check sensor probe
Data Table 2
calibration without calculating the value of p
point temperature by Equation 2 on the previous page. To use
"Dry Gas Setting" and either "High Wet Gas Setting" or "Low Wet Gas Setting." Moving horizontally across the table,
read the generated dew/frost point temperature under the appropriate temperature reading.
Note: The term "Flowmeter" used in the data tables and is equivalent to the word "rotameter" used in this manual.
A.2.2 Example 2
To determine generated dew/frost point temperatures other than those listed in
page must be used, as shown in the following example. If,
Dry Gas first dilution flowmeter setting F
Dry Gas second dilution flowmeter setting F
Wet Gas flowmeter setting = 20 cc/min F
Wet Gas diluted flowmeter setting F
Thermometer reading T = 20°C
and, P
= 17.535 mm Hg at 20°C (from Table 1 on page 19),
s
Then,
------------------------------------------------------------------ -
P w
=
347cc min
And, Pw = 0.0375 mm Hg, which is equivalent to a dew/frost point temperature of 48°C (by interpolation).
A.3 Vapor Pressure and Calibration Tables
Table 1 on page 19 is the vapor pressure of water as a function of temperature.
IMPORTANT: Two tables not included in this manual,
factory for each MG-101. These tables are supplied with the unit, and you must use these tables to
operate the MG-101. Since each table is specific to your instrument, you cannot use tables from another
unit. If you lose these tables, contact the factory and duplicates will be provided.
18
.
Data Table 2
w
= 4,500 cc/min
d1
= 4,500 cc/min
d
= 140 cc/min
w1
= 347 cc/min
w
F
w
------------------ -
P
=
w
F
+
w
⁄
347cc min
⁄
⁄
4500cc min
+
was compiled by calculating p
, set the rotameters per the columns headed
Data Table 2
F
w1
------------------------ -
P
s
F
F
F
+
d
w1
d1
⁄
140cc min
------------------------------------------------------------------ -
⁄
⁄
140cc min
4500cc min
+
, are sets of calibrations generated at the
Data Tables 2 and 3
and thus, the dew/frost
w
Data Table 2
, Equation 2 on the previous
⋅
(
)
17.353mmHg
MG-101 User's Manual
(3)
(4)
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