Toptech Systems MultiLoad II User Manual

Chapter 9 – Weights & Measures
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Firmware Version 3/4.31.37
9.3 WEIGHTS & MEASURES CHANGE LOG AND METROLOGICAL PARAMETER SECURITY
The last 1,000 Weights and Measures (W&M) parameter changes are logged in the MultiLoad’s Non-Volatile
RAM (NVRAM). Write access to these registers is restricted by software means. When all conditions are met for
changing a W&M parameter, a single write is allowed only after creating a new entry to the W&M change log,
which records the following information about the parameter change:
- Date
- Time
- Parameter name
- Event number
- Identifying character
- Affected preset (load arm)
- Affected flow meter
- Affected component
- Previous value
- New value
The W&M change log is stored in the MultiLoad NVRAM and cannot be edited or modified.
9.4 VOLUME CORRECTION FACTOR FEATURES
The MultiLoad II has the ability to calculate net volumes. Net volume, for the purposes of this discussion, is
defined to be the gross volume corrected to a reference temperature and/or a vapor pressure. The net volume is
calculated by multiplying the gross volume by a Volume Correction Factor (VCF). In MultiLoad II applications, the
VCF is the product of two different factors. These factors are the Correction factor for Temperature of Liquid
(CTL) and the Correction factor for Pressure of Liquid (CPL). The CTL and CPL features can be enabled
simultaneously or they can be enabled independent of each other.
VCF = CTL x CPL
Gross volume is the Raw Volume multiplied by a meter factor (MF). The Raw Volume is the unfactored meter
pulses divided by the flow meter's K-factor. The units of the K-factor are pulses per unit of volume. For example,
the K-factor of a 3-inch turbine flow meter is 50 pulses per gallon, nominally. The sequence below can be used to
conceptualize how pulses from a flow meter are used to determine Raw Volume, Gross Volume and Net Volume.
Raw Volume = Pulses/K-factor or Raw Volume = (Pulses) x (1/K-factor)
Gross Volume = Raw Volume x MF
Net Volume = Gross Volume x VCF
CTL Calculation - Tables established by the American Petroleum Institute (API) are used to provide the
Correction factor for Temperature of Liquid (CTL). MultiLoad II calculates the CTL in accordance with API
Standard 2540. The CTL is used to correct the Gross Volume to a volume at a reference temperature. After
applying the CTL to the gross volume, the resulting net volume represents the volume that the gross volume
would occupy if it were measured at the reference temperature.
Selected API tables are available in MultiLoad II to be used for specific liquids and specific reference
temperatures. All of the calculations make use of two variables; the variables are the Alpha of the liquid and the
Delta Temperature of the liquid.
Alpha is the coefficient of expansion of the liquid.

Toptech Systems MultiLoad II Specifications

General

Brand	Toptech Systems
Model	MultiLoad II
Category	Control Unit
Language	English