Configuring For Output In Lbs/Mmscf - Ametek 2850 User Manual

Configuring for Output in lbs/MMscf

The Model 2850 Analyzer is normally programmed to calculate moisture concentration in parts per million
volume (ppmv). The analyzer can also be configured to convert ppmv to pounds per million standard
cubic feet (lbs/MMscf), a unit of measure commonly used in the natural gas industry. Use the following
procedure to configure analog outputs and controller display for moisture in lbs/MMscf.
The relationship between ppmv and lbs/MMscf at 15.6°C (60°F) and 100 kPa absolute (14.7 psia) is:
1. The factory set system values for conversion factor (Convr_Factor), maximum allowable span
(Max_Span), and stored moisture generator (Moist_Gen) must be adjusted to reflect the conver-
sion. If the analyzer was calibrated in ppmv, Convr_Factor must be set to 0.0476. In addition,
Max_Span and Moist_Gen must be multiplied by 0.0476.
a. Refer to Part IV: Constants to change Convr_Factor to the new value.
b. Refer to Part III: Alarm Button to change Max_Span to the new value.
c. Refer to Part IV: Moist_Gen to change Moist_Gen to the new value.
2. Refer to Part IV: Display Flags to set flag for display line 1, 2, or 3 to either Held Moisture (Flag
= 1) or Live Moisture (Flag = 9). Refer to Part IV: Labels to change the display line format as
follows:
If display flag is Held Moisture (Flag = 1), change display label
If display flag is Live Moisture (Flag = 9), change display label
1 ppmv = 4.76 x 10
-2
= 0.0476 lbs/MMscf
= 47.6 lbs/MMscf
from: ~~~~ ppm Vol H2O
to: ~~~~~ H2O lbs/MMscf (for example)
from: ~~~~~~ Current H2O
to: ~~~~~ H2O lbs/MMscf (for example)
lbs/MMscf
Output Configuring A-1