Simulated Long-Rod Capacitive Level Sensor for Glue and Resin Coating
1. Why You Need It
Large container glue-filling and resin-coating machines need a level sensor that reads the material level along the full depth of the vessel — not just at a single point. This simulated long-rod capacitive level sensor uses a Teflon probe that extends into the container, providing continuous contact detection for glue, resin and coating media. It replaces imported gauges on filling machines with a cost-effective, easily configured domestic alternative.
2. Working Principle
The long-rod probe detects the material along its length by capacitive sensing, giving continuous level indication for glue and resin in large containers. The Teflon probe resists adhesion, while the potentiometer or handheld setter adjusts the switch point. The NPN output with configurable NC/NO action and an M12 connector make it easy to integrate into glue-filling and resin-coating machine controls.
3. Key Advantages
- Continuous long-rod detection
- Built for glue and resin coating
- Teflon probe resists adhesion
- NPN output (NC/NO switchable)
- Potentiometer or handheld setting
- M12 connector interface
- DC 24 V supply
- 3 bar pressure resistance
- 0 to 60 °C operating range
- Replaces imported gauges
Common Pain Points & Solutions
| Problem | Conventional Issue | Our Solution | Result |
|---|
| Glue-filling machines | Point sensors miss level | Long-rod continuous sensing | Full-depth level detection |
| Adhesive build-up | Metal probes foul | Teflon probe | Adhesion-resistant detection |
| Imported gauge cost | Expensive replacements | Domestic replacement | Cost-effective alternative |
| Flexible switching | Fixed output action | NC/NO switchable NPN | Fits any control logic |
Application Cases
Industry: Adhesive
Application: Glue filling machine level
Medium: Glue / adhesive
Pressure Range: 3 bar
Operating Temperature: 0 to 60 °C
Installation Environment: Filling machine
Customer Challenge: Monitor glue level in container
Previous Problem: Imported gauge costly
Solution: Long-rod Teflon sensor
Installation Location: Glue container
Result: Cost-effective level detection
Industry: Coating
Application: Resin coating machine
Medium: Resin / coating
Pressure Range: 3 bar
Operating Temperature: 0 to 60 °C
Installation Environment: Coating line
Customer Challenge: Resin level control
Previous Problem: Point sensor inadequate
Solution: Long-rod capacitive sensor
Installation Location: Resin vessel
Result: Continuous resin level
Industry: Packaging
Application: Adhesive dispensing system
Medium: Adhesive
Pressure Range: 3 bar
Operating Temperature: 10 to 40 °C
Installation Environment: Packaging line
Customer Challenge: Adhesive level monitoring
Previous Problem: Manual checks
Solution: Long-rod sensor, NPN
Installation Location: Adhesive tank
Result: Automated level monitoring
Industry: Woodworking
Application: Glue application machine
Medium: Wood glue
Pressure Range: Atmospheric
Operating Temperature: 10 to 50 °C
Installation Environment: Woodworking line
Customer Challenge: Glue level in applicator
Previous Problem: Sensor fouling
Solution: Teflon probe sensor
Installation Location: Glue applicator
Result: Reliable glue level
Technical Specifications
| Specification | Value |
|---|
| Product Type | Long-rod capacitive level sensor |
| Probe Material | Teflon |
| Detection | Contact / continuous |
| Output | NPN (NC/NO switchable) |
| Power Supply | DC 24 V |
| Interface | M12 connector |
| Pressure Resistance | 3 bar |
| Temperature Range | 0 to 60 °C |
FAQ
Q: What is a long-rod capacitive level sensor?
A long-rod capacitive level sensor uses an extended probe to detect material level along the full depth of a container, rather than at a single point. This provides continuous level detection for glue, resin and coating media in large vessels and filling machines.
Q: Why is Teflon used for the probe?
Teflon (PTFE) is highly non-stick and chemically resistant, so glue, resin and coating materials do not build up on the probe. This keeps the sensor accurate and reduces cleaning and maintenance in adhesive applications.
Q: What output does it provide?
It provides an NPN output whose action can be switched between normally-closed (NC) and normally-open (NO). This flexibility lets the sensor match the control logic of the glue-filling or coating machine.
Q: How is the switch point set?
The switch point is set via a potentiometer or a handheld setter. This allows the operator to adjust the detection level to suit the container and the specific glue or resin application.
Q: Can it replace imported gauges?
Yes. It is designed as a cost-effective domestic replacement for imported level gauges on large-container glue-filling and resin-coating machines, matching their function at a lower cost.
Q: What is the detection accuracy?
The detection accuracy is within 3% of the maximum detection range. This is sufficient for level control in glue-filling and resin-coating machines where precise level point detection is needed.
Q: What pressure can it handle?
It withstands up to 3 bar of process pressure, covering pressurized glue and resin dispensing systems as well as atmospheric vessels.
Q: How is it connected?
It connects via an M12 connector, a standard industrial electrical interface. The DC 24 V supply and NPN output wire directly into the machine's PLC or control relay.
Q: What temperature range does it cover?
It operates from 0 to 60 °C, covering the ambient and process temperatures typical of glue-filling and resin-coating operations.
Q: Where is it used?
It is used on glue-filling machines, resin-coating machines, adhesive dispensing systems and woodworking glue applicators. It provides continuous, adhesion-resistant level detection for adhesive media.
