SEKO-NA Forklift Scale Logo
SEKO Forklift Scales
  1478 Beechcraft - Rawlins, Wyoming USA 82301
Accurate, Reliable and Rugged Forklift Scale Technology
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North America
  Toll-Free  800-594-9288  Direct  307-321-4505
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Technical Information
Calibration Commentary
Preliminary Discussion:
SEKO Forklift Scale Electronics are unusual for scale installations. Most scales consist of two primary components: The Weight Sensing Mechanism and Sensors and the Control/Indicator (operator interface). In the common scale, the sensor and weighing mechanics are "dumb", providing a weight signal from a transducer in raw form. Most loadcell and pressure sensors produce a voltage signal with a common range of 1.8 mV/Volt or 3mV/Volt. The conversion from this low-level signal is produced by the Control.Indicator (operator interface). all of the amplification, buffering, averaging etc. is accomplished in the cab, not at the weighing mechanism. this is a simple and industry standard configuration, requiring cable sand other wiring from the weigh lifting mechanism to the Control/Indicator for processing and display.

Technical Innovation by SEKO Forklift Scale Designers:
We have listened to forklift users for many years complain about complications, wasted time and expense resulting from problems with calibration, wires and operator diligence. We have responded to those complaints by making the SEKO Forklift Scale orders of magnitude more rugged and intrinsically more accurate and repeatable on the mechanical side. Then, we looked to contemporary technical advancements in production precision electronic components and advances in extremely low power micro-computing. We designed a complete, extremely low-power scale circuit powered bymodern lithium battery technology. These innovations allow us to embed the actual scale electronics and battery-power in a sealed enclosure within the scale module itself, eliminating wires, cables and battery-chargers. Additionally, since the scale electronics are embedded in the scale weigh module, each weigh module can be factory calibrated for instant installation and weighing.

In operation, the essential SEKO Forklift Scale modules are mounted on the forklift carriage and the original forks are mounted on the weigh modules. This completes the scale installation.

Calibration:
Since each installation allows the user to select forks and accessories, those components place a load on the scale, offsetting the scale weight indication by the weight of the forks (and accessories). This empty fork offset is essentially a fixed tare, which is instantly compensated by the operator pressing the "ZERO" button. The scale is pre-calibrated, therefore, the operator can immediately begin to weigh items in normal operation.

A 5,000 pound weigh capacity scale will normally display "0" for no weight and "5000" for the 5,000 pound maximum weigh load. This means that when 180 pound fork is installed on the weigh module, the Indicator will display "180" until the "ZERO" button is pressed. Then the Indicator will display "0" with no load on the forks. The scale will indicate the actual,weight on the forks from that point forward. It should be obvious that a 5000 pound scale capacity with a pre-load of 180 pounds of fork weight will have an actual maximum weighing capacity of 4,820 pounds. (5,000 - 180)

Do not confuse the forklift lift capacity with the scale weighing capacity. A 5,000 pound lift rated forklift with a 5,000 pound scale capacity will not change. Only the regulated operating ratings will change with the machine and scale configuration.

Forklift lifting capacity de-rating due to addition of scale module:
The  SEKO forklift weigh module for Class II and Class III push the forks away from the carriage 6 inches. In addition, the Class II weigh modules weigh about 90 pounds each, so there is an additional de-rating of fork truck lift capacity due to the weight of the scale modules. Each track must be evaluated to determine the de-rating of the truck safe lift capacity, both in absolute weight lifted and also in the shift of the load center-of-gravity. You will find the dimensional and weight information in the manual for your particular truck make, model and often,serial number.

For the  SEKO Forklift Class II modules, the truck lift capacity is reduced by about 10 to 12%, making the maximum new lift rating of a 5,000 pound safe lift, reducing to 4,500 pounds (nominally). Remember, that weight capacity must also be reduced by the weight of the fork(s). If you are adding an attachment, such as a side-shifter or rotator, those attachments will also contribute an additional weight and load center de-rating.

SEKO Forklift Scale Technical Support:
Please consult with  SEKO Sales and Tech Support for assistance with calculating de-rating for your particular truck and application. We can also offer an Excel-type spreadsheet for easy automated calculation estimates. You should always consult your truck dealer or manufacturer for the best available information.

Finally, when discussing calibration, there are two calibrations to consider. The  SEKO Weigh Module is factory calibrated and only a ZERO adjustment is necessary to complete calibration for your truck and forks/attachments. However, the Control/Indicator selection and setup will also require adjustment in order to display accurate weights. Control/Indicator setup and calibration are covered in detail in the Indicator manufacturer's manuals.  SEKO Forklift Scale Tech Support is available 24-7 to assist your work.

SEKO Forklift Scale Tech Support: Call 805-758-4446 any time.


Home
Talking
Points
Technical
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SEKO-NA Forklift Scale Logo  Maple Leaf Image  US Flag Eagle
Global Contact: http://www.seko.com.my/
North America: http://www.sekoforkliftscales.com/
Toll-Free  800-594-9288 
Direct
307-321-4505
Field Sales
George Murphy Sales

Toll-Free: 844-917-5264

Missouri
Jim Palmisano
jpalm@sekoforkliftscales.com
Webmaster
Henry Nicolle
Last Revision: 12 October, 2016