Siemens SITRANS FUH1010PVX, Operating Instructions Manual, Page: 82 / 226

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1010BXFM-3 Section 2
The 1010BX has the ability to accept a 4-20 mA input for pressure. If used, the 1010BX will
process pressure data based on the analog input. This is recommended for pipelines that have
wide pressure variances.
To calculate a liquid’s Pressure Slope Factor:
Establish the maximum (Pmax) and minimum (Pmin) pressures for all liquids within the
Liquid Class. For each liquid, note the measured sonic velocity at Pmax and the sonic
velocity at Pmin (in-meters-per-second).
Use the following formula to calculate the Pressure Slope Factors with the Liquid Class:
Pressure Slope Factor = (Vs @ Pmin) - (Vs @ Pmax)
(Pmin - Pmax)
Calculate the average of all the Pressure Slope Factors within the Liquid Class.
To enter the Pressure Slope Factor:
From the [Liquid Table] menu cell, press to scroll down to [Pressure Slope].
Press to enable numeric entry.
Use the PC numeric keys or Magnetic Wand to enter the desired Pressure Slope Fac-
tor.
To enter the Pressure Slope Factor press .
This moves the highlight down to Base Temperature.
Setting the Reference Base Temperature
The System 1010 Interface Detector uses a reference Base Temperature of 60ºF (15.6ºC) for
the LiquIdent™ Slope, Pressure Slope, and other settings. Any temperature can be entered
and used as the reference Base Temperature (e.g., 68ºF/20ºC).
To enter the Base Temperature:
From the [Liquid Table] menu cell, press to scroll down to [Base Temperature].
Press to enable numeric entry.
Use PC numeric keys or Magnetic Wand to enter the desired Base Temperature.
To enter the Base Temperature press .
Altering the Base Temperature will result in all “Base” outputs and settable items to be refer-
enced to the selected temperature.
Entering K0 and K1 parameters (API thermal expansion coefficients)
The K0 and K1 parameters represent the thermal expansion coefficients for the Liquid Class.
The Interface Detector requires these parameters to apply the proper volume correction.
These coefficients can be found in the ASTM designation: D1250 or the API standard: 2540.
The default K0 and K1 values are 341.0957 and 0.0, respectively. These correspond to Crude
Oils. If these values suit the application, these menu cells can be bypassed by pressing the
<Down Arrow> twice. The following table lists K0 and K1 values of some common classes of
liquids.
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