Kistler-Morse KM Load Stand II - Manual (Page 23)

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97-1100-01 Rev. H
ManuaL caLiBration
note: Kistler-Morse SVS 2000™ signal processor performs a manual calibration automatically, with Quick Config.
1. Refer to the signal processor manual to determine how to obtain the A/D converter sensitivity, expressed
in Counts/mV. Record this value.
2. Record the Rated Load for one Load Stand.
3. Record the sensitivity (S) for your Load Stand.
Load Stand II Sensitivity
S2-025K, -075K, -150K, -200K, -300K, -400K,
-500K, -750K, -1M, S2-050K, -100K
26.67 mV/V
4. Record the excitation voltage for the system (typically 12 V).
5. Record the current live load in the vessel.
6. Calculate the Manual calibration values:
Scale Factor Weight= Rated Load (lbs or kg) x Number of supports Scale Factor Counts = S (mV/V) x
excitation Voltage (V) x Counts/mV Zero_Cal = current live load (lbs or kg)
Note: Scale Factor Counts and Scale Factor Weight establish the slope
of the Manual Calibration Line. Zero_Cal establishes the location of the line.
Indicated
Weight
Weight Signal in Counts
Live Load =
Zero_Cal
Scale Factor Counts
Scale Factor Weight
Scale Factor Counts
Scale Factor Weight
Slope =
Example: You are using four S2-100K (100,000 lb) Load Stand IIs to monitor a vessel.
The vessel currently contains 50,000 lbs of material. The vessel can hold a maximum of 350,000 lbs. Following
the Manual calibration procedure:
1. Counts/mV = 699.05 (from signal processor)
2. Rated load for one Load Stand is 100,000 lbs.
3. S = 26.7 mV/V (from Table 4-1)
4. Excitation voltage = 12 V (from signal processor)
5. Current live load = 50,000 lbs
6. Calculate the calibration values:
Scale Factor Weight
= Rated Load x Number of supports
= 100,000 lbs x 4 legs = 400,000 lbs