Elevator Load Weighing Device

Overview

Elevator load weighing devices measure the load in the car and tell the controller when it is empty, full or overloaded, so the drive can set the correct starting torque and block departure when overloaded. They are the reason a modern lift starts smoothly whether it carries one passenger or ten. One Elevator supplies replacement load cells, overload switches and the calibration units used in most elevator systems.

Applications

They are fitted in passenger lifts, hospital beds lifts, freight elevators and service lifts in residential blocks, office towers, hotels, hospitals and industrial sites, and suit OTIS, KONE, Schindler, Mitsubishi, ThyssenKrupp and Fujitec machines. A drifting load cell causes poor starting comfort and false overload alarms, both of which generate callbacks. In freight and hospital lifts, the overload signal often also drives a buzzer and a door-hold function. On modernisation work the load device is usually replaced with the controller, since the new drive needs an accurate signal from the first trip.

Types and Range

• Rope-end and machine-beam load cells
• Car floor and under-car platform load cells
• Overload switches and full-load contacts
• Analogue and digital weighing amplifiers
• Calibration weights, shims and test kits
• Mounting brackets, cables and junction boxes

Capacity is matched to the rated load, from 320 kg to 5000 kg and above.

Selection Guide

Choose by checking three things: the rated load and capacity, the output signal (analogue, relay or bus), and the mounting position. Then plan for recalibration after installation, since a load cell is only as accurate as its last calibration. Overload thresholds should be verified with test weights and recorded, not set by estimation. All devices are tested for linearity, repeatability, temperature drift and overload recovery.

Ordering and Lead Time

Stock sizes dispatch in 7-10 working days; calibrated heavy-capacity sets take 2-3 weeks. Send your rated load, output type and mounting arrangement and we will confirm fitment before you order.

Frequently asked questions

How do I select a load weighing device?

Send the rated load, the output type and the mounting arrangement. Sensor-based and rope-tension systems are not interchangeable.

What causes load weighing faults?

Drift and mechanical binding. A device that reads correctly when empty but not when loaded is usually a calibration or mounting problem.

Can you supply a calibrated set?

Yes, and calibrated heavy-capacity sets take 2-3 weeks because each unit is checked before dispatch.