User guide

Programming Manual
Page 21 March 2014
GAS COMPENSATION
Gas Turbines Only
Fluid measured by the gas turbine meter is compressible, and is also affected by temperature changes and pressure changes
as illustrated by the ideal gas law equation.
PV
T
=
PV
T
11
1
22
2
Absolute Pressure and Temperature
The ideal gas law equation shows that the volume of gas is determined by pressure and temperature applied to the gas under
running conditions. In this equation, the pressure, P, is absolute pressure the observed gauge pressure plus the atmospheric
pressure. The commonly used domestic unit of measure for absolute pressure is pounds per square inch absolute (psia).
Atmospheric pressure is considered to be 14.73 psi. Therefore, absolute pressure (psia) is the sum of the gage
pressure plus 14.73.
The absolute temperature in the equation above is expressed in degrees Rankine, which is calculated by adding 459.67 to the
temperature in ° F.
Because pressure and temperature have a large impact on the mass of gas moving through the flow meter both values must
be entered into the B3000 for accurate gas readings to occur.
OTE:N The B3000 calculates the correct pressure and temperature values without having to convert to absolute pressure or
degrees Rankine. The compensation values should be entered in psig and ° F.
Operating Pressure Op Pres
Basic Function (Gas Only)
At the Op Pres prompt, press ENTER. The first digit of the current pressure setting begins to flash.
If the current selection requires a change, use ▲ to increment the display digit until it matches the first digit of the required
pressure value. Next press ► to advance to the next digit and using ▲ to increment the second display digit until it matches
the second digit of the operating pressure. When the correct pressure setting has been entered, press ENTER to save the new
pressure value.
Operating Temperature Op Temp
Basic Function (Gas Only)
At the Op Temp prompt, press ENTER. The first digit of the current temperature setting begins to flash.
If the current selection requires a change, use ▲ to increment the display digit until it matches the first digit of the required
temperature value. Next press ► to advance to the next digit and using ▲ to increment the second display digit until it
matches the second digit of the operating temperature. When the correct pressure setting has been entered, press ENTER to
save the new temperature value.
Damping Factor Damping
Extended Function
The damping factor is increased to enhance the stability of the flow readings. Damping values are decreased to allow the
monitor to react faster to changing values of flow. This parameter can take on any value between 0…99 % with 0 being
the default.
At the Damping prompt, press ENTER. The current damping setting will begin to flash. If the current selection is correct, press
ENTER to advance to the next parameter.
If the current selection requires a change, use ▲ to increment the display digit until it matches the first digit of the required
damping value. Next press the ► arrow key to advance to the next digit and using ▲to increment the second display digit
until it matches the second digit of the damping value. Press ENTER to save the new damping value.