3-27
3.3.2.8 Miscellaneous User Parameters
This screen is used to change the Miscellaneous User Parameters.
WMO: When the Test Temperature is below 0 °C, %RH may be computed with respect to
either water in accordance with the World Meteorological Organization (WMO=1) or
with respect to ice (WMO=0).
P Units: 0 = psi
Note that all pressure measurements are
1 = bar
absolute with the exception of the input
2 = hPa
supply transducer which is gauge.
T Units: 0 = °C (currently the only option)
F Units: 0 = liters/min (currently the only option)
Date Fmt: 0 = mm/dd/yy (U.S. format)
1 = dd/mm/yy (European format)
MW Gas: Molecular Weight of the carrier gas. Setting this value to zero (0) forces the system
to revert back to the factory setting of 28.9645 (Molecular Weight of Air). When
using N
2
as the carrier gas, set the value to 28.0134. PPMw is the only parameter
directly affected by the value entered.
Note
-
The Molecular Weight does not alter the Enhancement Factors in
any way nor compensate for variations in solubility or
compressibility of various gasses. Therefore, when using a carrier
gas other than air or nitrogen, the validity of the Enhancement
Factors used in the calculation of humidity parameters cannot be
assured.
Tt Type: Set this to zero (0) when using the standard 10K thermistor for Test Temperature
measurement. A setting of one (1) indicates that the optional low temperature 1K
thermistor is to be used. Any time that the test temperature probe is changed, it must
either be recalibrated, or its previously computed calibration coefficients must be re-
entered.
Pt Type: This must be set to the full scale range (in psiA) of the Test Pressure transducer.
Pg Warn: If the supply pressure drops below this pressure, the system emits a warning signal to
indicate that the supply pressure is low.
MISC USER PARAMETERS
WMO
[ 1
]
P Units [ 0
]
T Units [ 0
]
F Units [ 0
]
DateFmt [ 0
]
MW
[ 28.9645
]
Tt Type [ 0
]
Pt Type [ 50
]
Pg Warn [ 50
]
Pg Stop [ 35
]
Ps Ctrl [ 1
]
EDIT
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