FUTEK's A2LA and NIST accredited load cell calibration lab offers calibration and recalibration services for load cells, torque sensors, and strain gage amplifiers. FUTEK load cell calibration equipment are ISO 17025 and ANSI Z540-1 certified for high accuracy and fast turnaround.
As load cells are exposed to continuous usage, aging, output drift, overload and improper handling, FUTEK highly recommends a yearly recalibration interval. Frequent force sensor recalibration helps confirm whether the sensor maintained its accuracy over time and provides a load cell calibration certificate to show that the sensor still meets specifications.
However, when the sensor is used in critical applications and harsh environments, load cells may require even more frequent calibrations. Please consult with our Technical Support Team, who will help you evaluate the most economical calibration service interval for your force sensor.
A force sensor calibration must meet the sensor's non-linearity spec, which is found on the sensor's spec sheet. A system calibration, which is the calibration of a sensor and a digital instrument, must meet the sensor's non-linearity times two and is listed on a certificate as system tolerance. A note is added when a sensor, or system, does not meet the specifications.
A force measurement system usually encompasses the force sensor, instrument or signal conditioner (amplifier electronics), cabling, and connectors. A full system calibration ensures that the whole system is performing accurately as expected.
Choosing a complete system calibration allows you to start using your force measurement solution out of the box. A system calibration creates a plug & play solution where all connectors, cables, and instrument settings are taken care of.
It depends on the type of force sensor and what is specified on its spec sheet. Please refer to the sensor's spec sheet and look for the standard calibration specified and the loading direction (tension, compression, clockwise, counterclockwise) that is offered with the sensor.
Calibration summary information may be available online using the sensor's serial number. Please retrieve a summary of your sensor calibration data in our Online Calibration Tool here.
Units of mV/V, or millivolt-per-volt, can be multiplied by the chosen supply voltage (or excitation voltage) to the sensor to get the mV output at the calibrated points. The slope of the curve of the calibration points is then used to convert the mV readings.
R.O. stands for rated output and will be the sensor's capacity, the last calibrated applied load, or the electrical equivalent of those points.
NL, or non-linearity, is how much the observed output under the load cell calibration curve deviates from a theoretical straight line, ranging from zero to the last calibrated loading point. The difference between these two points is displayed as a percentage of the final calibrated loaded amount, or rated output.
The first zero reading is to eliminate any zero offset (or load cell zero balance) and allow the span from the loading to be presented.
Shunt is a positive change in output that is generated from an unloaded sensor when resistance is placed between the -signal and- excitation connections of the sensor. Shunt information can be used to check the health of the sensor over time and assist with setting up devices, such as DAQ systems, by providing a known output without a physical load needed.
Electrical shunt output is presented into an equivalent load amount using the slope of all directions calibrated. This supplies confirmation of what the shunt change will be if using either direction of the listed calibration information.
A2LA information is presented in a polynomial equation with applied load indicated with x and output indicated by y. The output is found by solving for y where the applied load is placed in the equation for x. The applied load is found by solving for x where the observed output is placed in the equation for y.
"As Found" information on a calibration certificate is the calibration specs of a force sensor, or system, as it was first received at our load cell calibration lab. "As left" information is the result after any noted adjustments that are made to help bring the sensor, or system, into the specification. "As found"="as left" means that the "as found" information meets specification and no adjustments were needed to the sensor or system.
An "as found" and "as left", if necessary, are performed under the same load cell calibration service and do not incur and additional charge.
Dual direction calibration must be performed at the same time and under the same environmental conditions and calibration setup to be effective. A dual-direction calibration service must be ordered to get valid dual-direction calibration information.
Please include all cables that came with the sensor. If you are requiring a full system calibration, please include the instrument (load cell amplifier) alongside your sensor. We do ask that you remove all fixtures from the unit prior to shipment.
FUTEK's recalibrations typically take three or four business days upon receiving the unit. (If there are functionality issues, the turnaround time is around seven business days.) If you require expedited load cell recalibration, please contact our team and we will do our best to accommodate your schedule.
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To get more information about load cell calibration, please visit our main Calibration Services Page. Ready to calibrate your Load Cell, Torque Sensor or Multi-Axis Force Sensor? Contact us to recalibrate your sensor.