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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 loadcells which is to be adhered.
5. There are unbalanced load points, which is happened by the load of system.
6. Turn the multi trun resistivity of a summing box to the right direction to go up the load,or left.
7. Coordinate repeatedly the multi trun 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.
Parallel misalignment is the offset of two mating shaft centerlines although the centerlines remain parallel to each other. Angular misalignment is two shaft centerlines intersecting at some angle other than zero degrees. End float is the relative displacement of one shaft end with respect to the other.
A single-flex coupling accepts angular misalignment only. That means it acts as a hinge or a pivot and cannot accept parallel misalignment. A double-flex coupling accept both angular and parallel misalignment. It may be visualized as two single-flex couplings with a short spacer or distance between the pivots. Depending on their design, both single-flex types may or may not accept end float. A rigid coupling, as its name implies, is merely a set of rigid flanges mounted on a shaft. It cannot compensate for or permit any misalignment.
Floating Shaft – applicable to both shaft and flange type torquemeters. Use a single flex coupling at each shaft end to accommodate angular misalignment
Floating Mounted – for shaft style torquemeters only. Use a double flex coupling at each shaft end to handle both parallel and angular misalignments.
1. RATED CAPACITY(R.C)
The maximum axial load that a load cell is designed to measure within its specification.
2. RATED OUTPUT(R.O)
The algebraic difference between the outputs at no-load and at rated load.
3. NON-LINEARITY
The maximum deviation of the cali-bration curve from a straight line between zepo 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 increasing from zero and the othr while decreasing from rated output. The points are taken on the same continyuous 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 conditions, and in the same direc-tion. 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 exitation and with on load applied, usually expresed 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 withn 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 change in ambient temparature, over the compensated temperature range.
10. TEMPERATURE EFFECT ON ZERO BALANCE
The change in zero balance due to a change in ambient temperature. Usually expressed as +/- a percentage change 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 temperture, 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 50 V DC.
14. EXCITATION
The voltage or current applied to the input terminals of the load cell.
15. SAFE OVERLAD
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 conditins and other variavles remaining constant. Usually measured with rated load applied and expressed as a percent of rated output over a specific peridod of time.
18. ACCURACY
tated as a limit tolerance which defines the average deviation between the actual output versus theoretical output. In practical load cell applicatins, the potential errors of nonlinearity, hysteresis, repeatabilly and temperature effects do not normally occur simultaneously, nor are they necessarily additive. Therfore, accuracy is calculated based upon the RMS value of potential erros, assuming a temperture band of ±10℃, full rated load applied, and proper set up and calibration. potential errors of the readout, cross talk, or creep effects are not included.
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