GX Label / Gap Sensor: Precision Detection for Printing, Packaging & Labelling Machines
In modern printing, packaging and labelling machines, accurate detection of labels and gaps is essential for maintaining correct positioning, registration and machine synchronization.
The GX GAP-VE04B04M8 Label / Gap Sensor is designed as an application-focused sensing solution for detecting labels, gaps and related transitions in automated machine processes.
With its optimized thin-shell and deep-groove design, fast 50 ms response time, dynamic learning and integrated NPN/PNP output, the GX label sensor provides a practical solution for machine builders and automation engineers.
What Is a Label / Gap Sensor?
A label/gap sensor is a specialized fork-type sensor used to detect the difference between a label and its carrier material.
A typical label web passes continuously through the sensor:
LABEL → GAP → LABEL → GAP → LABEL
As the material passes through the sensing slot, the sensor detects the transition and provides a switching signal to the machine controller.
This signal can be used for:
- Label positioning
- Label counting
- Print registration
- Dispensing control
- Material indexing
- Cutting synchronization
- Machine cycle control
The GX catalogue identifies the GAP-VE04B04M8 specifically as a Label Gap Sensor.
Designed for Real Machine Applications
The GX Label / Gap Sensor is positioned in the catalogue for three important industrial application areas:
Printing Machines
In printing applications, accurate label or web detection can provide a reference for print registration and machine timing.
The sensor can detect the label/substrate transition and provide the required switching signal to the automation controller.
Packaging Machines
Packaging equipment often requires accurate detection of packaging material movement and indexing.
The label/gap sensor can be used where the machine needs to identify a repeated material transition.
Labelling Machines
For automatic labelling machines, consistent label detection is essential for correct dispensing and positioning.
The GX sensor can detect the label and gap as the label web passes through the sensor slot.
The catalogue specifically highlights printing machines, packaging machines and labelling machines as application areas.
GX GAP-VE04B04M8 – Key Features
The GX product is built around a compact slot/fork sensing design.
Optimized Thin-Shell & Deep-Groove Design
The sensor uses an optimized thin-shell and deep-groove construction intended for label detection applications.
This allows the label web to pass through the sensing area while maintaining a compact sensor for
50 ms Response Time
The specified signal transmission response time is 50 ms.
For machine builders, response time should always be evaluated together with actual label size, gap, material and machine speed.
Integrated NPN & PNP Output
The sensor provides NPN/PNP integrated switching output, allowing flexible integration with different PLC input architectures.
Light / Dark Switching
The switching function can be configured for light/dark operation through the control buttons.
IP65 Metal Housing
The sensor uses a metal housing with IP65 protection, making it suitable for many industrial machine environments.
Smart Teaching for Easy Machine Setup.
One of the important features of the GX Label / Gap Sensor is its integrated teaching and adjustment system.
The sensor supports dynamic learning through the control panel, followed by fine adjustment using the + and − buttons.
The catalogue describes a simple setup sequence:
Step 1
Place the label or substrate in the effective area of the slot sensor.
Step 2
Pass multiple labels/tags through the slot sensor.
Step 3
The sensor learns the switching condition and the threshold can then be fine-adjusted.
2 mm Minimum Detectable Object
The GAP-VE04B04M8 datasheet specifies a 2 mm Minimum Detectable Object (MDO) for spacing between labels/label size, depending on label thickness.
This specification should be considered together with:
- Label thickness
- Label material
- Carrier material
- Gap size
- Machine speed
- Sensor mounting
- Contrast between label and carrier
For new machine development, application testing with the actual label material is recommended.
Technical Specifications
Parameter| GAP-VE04B04M8
Type| Label Gap Sensor
Working Principle| On-Off Level
Dimensions| 10 mm × 25 mm × 64.3 mm
Groove Width| 3 mm
Fork Depth| 42 mm
Light Source| LED Infrared
Switch Function| Light / Dark
Teaching| Dynamic
Teaching Adjustment| + / − buttons
Switching Output| NPN / PNP
Switching Frequency| 10 kHz*
Response Time| 50 ms
MDO| 2 mm**
Connection| M8, 4-pin / conductor
Housing| Metal
Protection| IP65
Certification| CE / RoHS
*
