Load Cell Terminology

Accuracy: What is accuracy in load cell terminology? Load Cell Central demystifies this crucial concept, ensuring you understand the foundation of precise measurement.

Calibration: The comparison of a load cell output signal against a known standard.

Calibration Curve: The comparison of load cell outputs to a known standard when output is measured between terminal points of zero (no load) and rated capacity.

Combined Error (Non-linearity and Hysteresis): Learn about combined error in load cell terminology with Load Cell Central, enhancing your knowledge for improved accuracy and performance in applications.

Compensated Temperature Range: The range of temperature over which a load cell is compensated to maintain rated output and zero balance within specified limits.

Creep: The change in load cell output occurring with time (normally 30 minutes), 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.

Dead (Static) Load: Also known as permanent or static loads. These are loads that are static over time, such as a frame, structure, or other immovable object.

Deflection: The change in length of the load cell along the primary axis between no-load and rated load conditions, with all other mechanical influences remaining constant; usually expressed in inches or millimeters.

graphic depicting deflection of a bending beam load cellgraphic illustration deflection of a compression load cell

Drift: A random change in output under constant load conditions.

Dynamic Load: Non-static loading. It may involve considerations such as impact, momentum, vibration, slosh dynamics of fluids and similar phenomenon.

Error: The algebraic difference between the indicated and true value of the load being measured.

Excitation: The voltage applied to the input terminals of the load cell.

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Hysteresis: Wondering what hysteresis means in load cell terminology? Load Cell Central explains it simply, ensuring you understand its impact on measurement accuracy.

Input Resistance: The resistance of the load cell bridge circuit measured at the positive and negative excitation terminals with no load applied and with the output terminals open-circuited.

Insulation (Leakage) Resistance: The DC resistance measured between three points: the transducers bridge circuit and the transducer element; the transducer bridge circuit and the cable shield; the transducer element and the cable shield. Note: Normally insulation resistance is measured with a minimum of fifty volts DC potential applied and under standard test conditions.

Load: The weight or force applied to the load cell.

Load Cell: What is a load cell? Load Cell Central breaks down the basics, offering insights into how these devices measure force and weight in various applications.

mV/V: The full voltage output of the load cell expressed in terms of its supply voltage. E.g. 2mV/V load cell would produce 2mV times the supplied voltage at full capacity.

Non-linearity: Non-linearity in load cell terminology can seem complex, but Load Cell Central makes it easy to grasp, highlighting its role in ensuring precise measurements.

Non-repeatability (Repeatability): Discover what non-repeatability in load cell terminology means with Load Cell Central, emphasizing its importance in achieving consistent measurement results.

NTEP: ntep logoNTEP stands for National Type Evaluation Program, which is a non-profit corporation. Scales and other weighing equipment that are NTEP approved have been tested and evaluated to ensure they meet all government standards and requirements.

Operating Temperature Range: The extremes of temperature within which a load cell will operate without permanent adverse change to any of its performance characteristics.

Output: The electronic signal (voltage, current, etc.) produced by a load cell and measured as the algebraic difference between the signal at applied load and the signal at minimum load.

Output Resistance: The resistance of the transducer bridge circuit measured at the positive and negative signal terminals with no load applied and with the input terminals open-circuited.

PLC (Programmable Logic Controller): What does PLC stand for in load cell terminology? Load Cell Central demystifies this term, explaining how logic controllers integrate with load cell systems.

Primary Axis: The axis along which the load cell is designed to be loaded; normally its geometric centerline.

graphic illustrating how to identify the primary axis of a load cell

Rated Capacity: The maximum axial load that the load cell is designed to measure within its specifications.

Rated Output (Sensitivity, Full Scale Output): The algebraic difference of the load cell output at no-load compared to its output with the rated load applied; usually expressed in terms of millivolts/volt (mV/V) of excitation.

Recommended Excitation: The maximum excitation voltage of the transducer which operates within its specifications; usually expressed in VDC.

Reproducibility: The degree of agreement between the results of measurements taken under changing conditions.  The changing conditions may be due to different methods or instruments being used, measurements being made by different technicians, or measurements being made over a period of time.

Resistance (Electrical): A measure of the degree to which an object opposes the passage of an electric current. The standard primary unit of electrical resistance is the Ohm (Ω).

Safe Overload: The maximum load which can be applied without causing a permanent change in the performance specifications; usually expressed in percent of full scale capacity.

Shear Strain: Shear strain in load cell terminology might sound technical, but Load Cell Central simplifies it, showing how it affects the accuracy of force measurements.

Shunt Calibration: Electrical simulation of load cell output by insertion of known shunt resistors between appropriate points within the circuitry.

Specification: The error limits within which a device should function for a given technical parameter. Also, an explicit set of requirements to be satisfied by a material, a design, and/or a product.

Strain Gauge: Strain gauge in load cell terminology is a key concept, and Load Cell Central provides a clear explanation, outlining its critical role.

illustration showing deformation of strain gauges in tension and compression

Temperature Shift (Effect) on Output: The change in output due to a change in load cell temperature; usually expressed as a percentage of load per degree Fahrenheit (Celsius) change in temperature.

Temperature Shift (Effect) on Zero: The change in zero balance due to a change in ambient temperature; usually expressed in percent of rated output per degree Fahrenheit (Celsius) change in temperature.

Ultimate Overload: The maximum load which can be applied without causing structural failure; usually expressed in percent of full scale capacity.

Wheatstone Bridge: style="display: none;">Wheatstone Bridge

Wondered what a Wheatstone Bridge is in load cell terminology? Load Cell Central clarifies this fundamental principle for accurate and reliable measurements.

Diagram for wheatstone bridge electrical circuit

Zero Balance (Zero Offset): The output signal of the load cell with rated excitation and with no-load applied; the amount of deviation in output between true zero and a real load cell with zero load; usually expressed in percent of rated output.

Zero Return: The difference in zero balance measured immediately before rated load application of specified duration and measured after removal of the load, and when the output has stabilized.

Zero Shift: A permanent change in the no load output.

Zero Stability: The degree to which the transducer maintains its zero balance with all environmental conditions and other variables remaining constant.

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