Calibration For Volume Calculations - ABB LevelMaster 7100 User Manual

3. Under LEVEL 1, click the value field next to Level 1 Bias, and type the manual measurement value.
4. Under LEVEL 2, click the value field next to Level 2 Bias and type the manual measurement value.
5. Click Send to save the configuration.
6. Proceed to calibrate for volume calculations.

Calibration for volume calculations

In addition to displaying and storing the level and temperature measurements received from the sensor, the LevelMaster
application calculates the gross volume of the fluids being measured. This section provides an overview of the calibration
required for accurate gross volume calculations which reflect actual field conditions.
Gross volume calculations take into consideration the height of a tank and the measured levels. Because there can be tank
shape irregularities (tank skin bulging or other external damage) at different tank sections, the volume calculation accuracy can
be affected if these irregularities are not accounted for. The LevelMaster application provides the ability to adjust volume
calculations to account for those irregularities by allowing the use of correction factors. Section 7.2.1, Overview of the strapping
table, describes this functionality.
IMPORTANT NOTE: The strapping table configuration screen may vary depending on the host controller model
and the PCCU32 version used. Click Help for additional information for each version.
Calibration for volume calculations is available only from the host controller. MasterLink does not support this
functionality.
Overview of the strapping table
Gross tank volumes are calculated using a formula that uses tank levels and a strapping table for individual tanks. Creating a
strapping table consists of defining several sections for the tank which represent different heights and assigning a correction
factor to each section so that the calculated volume accurately reflects any irregularity.
IMPORTANT NOTE: The strapping table configuration is applicable only when the LevelMaster is connected to a
Totalflow host controller. There is no capability for developing a strapping table when the LevelMaster is installed
standalone. MasterLink does not support this capability.
Strapping table parameters
The following three strapping table parameters must be configured to create a strapping table:
Number of tank sections (10 max) – The tanks can be divided into horizontal sections. Usually the actual straps around
the tank are used for section dividers. Because tanks may not be uniform from bottom to top, dividing each tank into
sections allows more accurate information for each section. If the tank is uniform, the user may enter only one section.
Section number height – Each section (1-10) of the tank has an entry for its height, in inches.
Section number volume factor – Each section (1-10) of the tank has an entry for its own volume factor per ¼ inch of
height. By default, this is barrels per ¼ inch. However, because the tank is broken into sections, individual volume factors
can be adjusted based on the condition of each section. Therefore, a section which has sustained damage, either concave
or convex, may be adjusted to allow for the missing or additional storage space.
For example, a twenty-foot tank may be divided into five, 48-inch calibration sections. Using default English units, enter the
height at the top of each of the five sections and the barrels per quarter inch of tank volume within that section. The host
software then calculates the gross volume for each of the tank sections and adds them together.
Configuring the strapping table
To configure the strapping table:
1. On the navigation tree, expand Tank Calibrate.
2. Select the tank required.
3. On the Calibrate tab, scroll down to locate the No. of Tank Sections (Figure 57). The default is set to 0.
4. Select the value field and type the number of sections (1-10).
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