(1) Rated Capacity(R.C.)
The maximum axial loads that load cells are designed to measure within its specification.
(2) Rated Output(R.O)
The algebraic difference between the outputs at no-load and at rated load. Usually load cell output is specified in mill-volts per volt at rated capacity.
(3) Non-linearity
The maximum deviation of the calibration curve from a straight line between zero and rated load outputs,expressed as a percent of the rated output and measured on increasing load only.
(4) Hysteresis
The maximum difference between output readings for the same applied load one point obtained while decreasing from rated output. The points are taken on the same continuous cycle. The deviation is expressed as a percent of rated output.
(5) Repeatability
The ability of a load cell to reproduce output readings when the same load is applied to it consecutively, under the same direction. Repeatability is expressed as the maximum difference between output readings as a percent of rated output.
(6) Zero balance
The output signal of the load cell with rated excitation and with on the applied, usually expressed in percent of rated output.
(7) Temperature range,compensated
The range of temperature over which the load cell is compensated to maintain rated output and zero balance with specific limits.
(8) Temperature range ,Safe
The range of temperature over which the load cell may be safely operated up to full scale without causing failure but specifications may not be met.
(9) Temperature effect on rated output
The change in rated output due to a change in ambient temperature. Usually expressed as +/- a percentage change in rated output per degree C changes in ambient temperature, over the compensated temperature range.
(10) Temperature effect on zero balance
The change in rated output due to a change in ambient temperature. Usually expressed as +/- percentage changes in rated output per degree C change in ambient temperature, over the compensated temperature range.
(11) Terminal resistance , input
The resistance of the load cell circuit measured at the excitation terminal, at standard temperature, with no-load applied, and with the output terminals open-circuited.
(12) Terminal resistance, output
The resistance of the load cell circuit measured at the output signal terminals, at standard temperature, with no-load applied, and with the excitation terminals open-circuited.
(13) Insulation resistance
The DC resistance expressed in ohms measured between any electrical connector pin or lead wire and the load cell body or case. Normally measured at 50V DC
(14) Excitation
The voltage or current applied to the input terminals of the load cell.
(15) Safe overload
The maximum load in percent of rated capacity, which can be applied without causing a permanent change in the performance specifications.
(16) Ultimate overload
The maximum load in percent of rated capacity, which can be applied without producing a structural failure.
(17) Creep
The change in load cell output occurring with time, while under load, and with all environmental conditions and other variables remaining constant.
Usually measured with rated load applied and expressed as a percent of rated output over a specific period of time.
(18) Accuracy
Stated as a limit tolerance, which defines the average deviation between the actual output versus theoretical output. In practical load cell applications, the potential errors of nonlinearity, hysteresis, repeatability and temperature effects do not normally occur simultaneously, nor are they necessarily additive. Therefore, accuracy is calculated based upon the RMS value of potential errors, assuming a temperature band of +/- 10 C, full rated load applied, and proper set up and calibration. Potential errors of the readout, cross talk, or creep effects are not included.

Multi-Transducer Summing Box Model : SB4P

The Summing-Junction box is a multi- cell interface for signal conditioning and
load cell indicating instruments.
Many weighting systems used multiple load cells and therefore require a summing junction box
to tie or sum the load cell signals together,allowing a digital weight indicator to read a single system signal.
The Summing process actually wires multiple load cells so that all their signal lines and excitation lines
are in parallel,providing instantaneous electronic summing of the signals.

Load cell summing is necessary because:
~Weight distribution in multiple load cell systems is not equal at load cell. The vessel loading process and
the characteristics of the material and many other factors affect weight distribution on the load cells.
~It is virtually impossible to make each load cell exactly alike. Load cell manufacturing process tolerances
allow for some variance in individual cell specifications .This variance,if unchecked,would not allow for the
kinds of accuracy required in modern process applications.


Installing the load cell & summing box

1. Supply a power to the indicator after distributing power lines.
2. Set up indicator as indicated in the instruction.
3. Test the calibration indicated as in the instruction of Digital indicator.
4. Press a quarter of maximum capacity on the upper parts of load cells which is to be adhered.
5. There are unbalanced load points, which is happened by the load of system.
6. Turn the multi turn resistivity of a summing box to the right direction to go up the load,or left.
7. Coordinate repeatedly the multi turn resistivity like the case of No.5 above to even up the
load of 4 points
8. Set on calibration as indicated in the digital indicator.