Liquid Level Sensors for Thin Tubes
| Item | Spec. |
|---|---|
| Product type | Liquid level sensor for thin tubes |
| Series models | LS-24L LS-24D LS-24LP LS-24DP LS-5L LS-5D LS-5LP LS-5DP |
| Detection method | Non-contact photoelectric sensing |
| Detection object | Liquid |
| Applicable tubing | Transparent tube |
| Tube outer diameter | Φ1.6～2.6 mm |
| Max. tube wall thickness | 0.5 mm |
| Power supply | LS-24 models: 12–24VDC ±10%, ripple 10% or less LS-5 models: 5VDC ±10%, ripple 5% or less |
| Current consumption | LS-24 models: 17 mA or less LS-5 models: 24 mA or less |
| Control output | NPN or PNP open collector, 80 mA at 30VDC or less |
| Operation mode | Light-ON 或 Dark-ON |
| Light-ON operation | Output ON when no liquid is detected |
| Dark-ON operation | Output ON when liquid is detected |
| Response time | 0.5 ms or less |
| Light source | Red LED |
| Wavelength | 647 nm |
| Indicators | Operation indicator: orange LED stability indicator: green LED |
| Sensitivity adjustment | Adjustment volume provided |
| Mounting area | 23 × 21 mm |
| Material | Case: PBT filler: polyester |
| Operating temperature range | −25 to +55°C, non-freezing |
| Ambient humidity | 30–85% RH, non-condensing |
| Protection rating | IP50 |
| Weight | Approx. 20 g |
Specification notes
Q1: What is the TAKEX LS Series?
A: The LS Series consists of non-contact photoelectric liquid level sensors designed to detect liquid through small-diameter transparent tubes.
Q2: What tube sizes can the LS Series detect through?
A: It supports transparent tubes with outer diameters from 1.6 to 2.6 mm and wall thicknesses of 0.5 mm or less.
Q3: Does the LS Series contact the liquid directly?
A: No. The sensor mounts outside the transparent tube and detects the liquid photoelectrically without contacting it.
Q4: What models are available in the LS Series?
A: The lineup includes LS-24L, LS-24D, LS-24LP, LS-24DP, LS-5L, LS-5D, LS-5LP, and LS-5DP.
Q5: What is the difference between LS-24 and LS-5 models?
A: LS-24 models operate from 12–24VDC, while LS-5 models operate from 5VDC. Both groups include NPN, PNP, Light-ON, and Dark-ON versions.
Q6: What is the difference between Light-ON and Dark-ON?
A: Light-ON models turn the output ON when no liquid is detected, while Dark-ON models turn the output ON when liquid is detected.
Q7: Are both NPN and PNP outputs available?
A: Yes. LS-24L, LS-24D, LS-5L, and LS-5D use NPN outputs, while LS-24LP, LS-24DP, LS-5LP, and LS-5DP use PNP outputs.
Q8: What is the response time of the LS Series?
A: The response time is 0.5 ms or less for all models.
Q9: Can the LS Series detect colored liquids?
A: The LS Series is primarily intended for transparent liquids. Some colored liquids may not be detected reliably depending on their optical characteristics and should be evaluated under actual operating conditions.
Q10: How do I select an LS Series model?
A: First select either 12–24VDC or 5VDC power, then choose NPN or PNP output, and finally select Light-ON or Dark-ON according to the required liquid-level control logic.