Linear Wire Displacement Sensor for Mobile Lifting Columns
Application Report | Sep. 2026 | Real-Time Height Measurement and Multi-Column Synchronization
At a Glance
Linear Wire Displacement Sensor in AGV Forklift Applications
- Continuous height measurement for each lifting column
- Real-time position comparison for synchronized movement
- Direct 0–5 V analog output to the PLC
- 2000 mm measuring range with IP54 protection
At a Glance
Mobile lifting columns are widely used to raise heavy-duty trucks, buses, and other large vehicles for inspection and maintenance. Several independently driven columns are positioned around the vehicle and must move together throughout the lifting process.
Differences in load distribution, mechanical resistance, and motor performance can cause the columns to move at slightly different speeds. The control system therefore needs continuous position feedback from every column to monitor the actual lifting height and detect synchronization errors.
A BriterEncoder Linear Wire Displacement Sensor measures the relative movement between the stationary column and the moving carriage. It converts the carriage displacement into a continuous electrical signal that the PLC can display, compare, and use in its control logic.
The Goal
Operating time, limit switches, and motor parameters do not always represent the actual mechanical position of a lifting column.
The system needs direct height measurement from each column so that it can:
- Display each column’s current height on the HMI.
- Compare the positions of all columns in real time.
- Detect excessive height differences.
- Slow down, stop, or generate an alarm according to the control program.
- Use measured position as a reference for soft limits and overtravel warnings.
This continuous feedback gives the PLC a common measurement basis for coordinating independently driven lifting columns.
The Solution
BriterEncoder provides a 2000 mm draw-wire displacement sensor with a 0–5 V analog output and IP54 protection for indoor mobile lifting column systems.
The sensor body is mounted on the stationary structure of the column. The wire-rope end connects to the moving carriage, lifting arm, or platform.
As the carriage rises, it pulls the wire rope out of the sensor. When the carriage lowers, an internal spring-loaded reel retracts the wire rope. The sensor converts the extension length into a proportional 0–5 V signal.
The PLC scales this signal into an actual height value in millimetres and compares the readings from all lifting columns.
How It Works
1. The lifting carriage moves upward or downward.
2. The wire rope extends or retracts with the carriage.
3. The sensor converts the displacement into a continuous 0–5 V signal.
4. The PLC maps the signal to the corresponding lifting height.
5. The control program compares the height of each column and applies the required synchronization logic.
Each column should be calibrated individually after installation. The system should then be checked under unloaded and rated operating conditions.
Each column should be calibrated individually after installation. The system should then be checked under unloaded and rated operating conditions.
The Benefits
- Real-Time Height Display: Operators can view the current position of each lifting column on the HMI.
- Improved Synchronization: The PLC can identify position differences during lifting and lowering.
- Simple PLC Integration: The 0–5 V analog output connects directly to a compatible analog input.
- Continuous Stroke Monitoring: The system receives position data throughout the complete operating cycle.
- Compact Installation: The sensor requires little installation space and does not affect the load-bearing structure.
- Easier Maintenance: Height data helps technicians check column consistency after servicing or component replacement.
