Kistler-Morse KM SVS2000 - Manual (Page 67)

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TracKIng Menu [80]
The Tracking Menu is used to set up and monitor the SVS2000’s zero tracking and material tracking functions.
This chapter provides explanations of each of the tracking parameters and navigation procedures through the
menu tree.
81-85 TracKIng paraMeTerS
Tracking provides the ability to reject sensor drift and other related long-term errors while preserving the
displayed and output weight’s stability and accuracy. Discrimination between material movement and sensor
drift is accomplished by calculating the rate of change of the sensor input signal, and comparing this rate to a
user-defined threshold rate. The SvS2000 stops tracking when the rate of change exceeds the threshold rate,
indicating that material is actually moving. Additionally, discrimination between slow material loss (such as from
a leak in the vessel) or gain and sensor drift is accomplished by comparing the total drift to a user-defined limit.
The SvS2000 limits the maximum correction to this user-defined limit, so the tracking function does not mask
real material losses or gains. There are two aspects to the tracking function. See Figure 14.
Zero tracking
establishes a user-defined window around the zero live load. When the raw weight falls
inside of the window (usually indicating a negligible amount of material in the vessel) and
the rate of change is below the threshold rate, the corrected weight remains constant at
zero. The correction is done by the algebraic addition of a correction offset value. If the
raw weight falls outside the window on the negative side, the SVS2000 resets the zero
calibration point to that raw weight and sets the window around the new zero calibration
point.
Material tracking
Establishes a reference when material movement within a vessel has become stable (rate
of change is below the threshold) during filling and batching processes. This reference is
then used to maintain and hold steady the outputs. When the change in raw weight falls
within the drift limit, the corrected weight remains constant. The correction is done by the
algebraic addition of a correction offset value. If the accumulated drift exceeds the drift
limit threshold, the SVS2000 begins tracking the material movement, which may be caused
by a slow leak in the vessel.
Zero and material tracking affect setpoints, current output, and serial output as well as the vessel monitoring
display.
Tracking can be used in any of the following combinations:
• no zero or material tracking
• Zero tracking only
• material tracking only
• Zero tracking and material tracking