Spécifications des capteurs de niveau optique & Sélection

This optical level sensor specification resource helps buyers compare the key electrical, mécanique, and wetted-material details before requesting a datasheet, Exemple, or quote. HojellyTek manufactures photoelectric optical level sensing solutions in Shenzhen for OEM/ODM projects, Réservoirs industriels, appliance reservoirs, Systèmes pétroliers, Systèmes d’eau, and exported sensor assemblies for US, EU, and India buyers.

Use this page as a selection checklist before choosing an Capteur de niveau optique for your tank, Contrôleur, or equipment design.

Optical Level Sensor Specification Sheet

An optical level sensor is normally selected by matching the control system first, then the tank and liquid environment. The buyer should confirm power supply, Charge de courant, Type de sortie, switching logic, Matériaux humides, température, pression, Filetage de montage, cable style, and IP protection before ordering.

How the Optical Sensing Specification Works

A photoelectric optical level sensor uses an infrared LED, a phototransistor receiver, and a prism-shaped sensing tip. À l’état sec, the prism reflects light internally back to the receiver. Lorsque le liquide recouvre le prisme, the optical path changes because the liquid has a different refractive behavior from air. The electronics convert that optical change into a switching output.

This makes optical point level sensors useful where the buyer wants compact size, no moving float, fast electronic switching, and a clean signal for low-level or high-level detection. Cependant, the specification must fit the real liquid and installation. Écume, bulles, heavy coating, strong contamination, poor mounting angle, incorrect output wiring, or incompatible wetted materials can all create field problems.

Match Electrical Specs to the Controller

The first selection step is power and output. HojellyTek’s standard supply voltage range is 5–24VDC, which allows use in many low-voltage control boards, appliance systems, industrial controllers, and OEM tank monitoring circuits.

For simple point-level detection, the standard output choices are NPN ou PNP. NPN is commonly selected where the input expects a sinking signal, while PNP is used where the input expects a sourcing signal. The wrong output type may make the sensor appear “dead” even when the sensing tip is working correctly. For wiring details, compare the Sortie NPN/PNP guide before confirming the order.

Some projects ask about 4–20 mA because they are used to continuous level transmitters. For this resource page, the confirmed standard range is for optical point level switching. If the application requires an analog continuous signal, the output requirement should be reviewed separately at the RFQ stage rather than assumed.

Load current is also important. The confirmed standard load current is ≤ 100mA. If the sensor drives a PLC input, this is usually a signal-level load. If the buyer wants to drive a relay, lamp, buzzer, or solenoid directly, the circuit must be reviewed carefully because those loads may exceed the sensor output rating.

Select NO or NC Logic for the Alarm Function

The same sensor body may be used for different control purposes depending on the switching logic. NON et NC should be selected according to how the machine should behave when the sensing point is dry, mouillé, disconnected, or in alarm.

For a low-level protection tank, the buyer may want the controller to stop a pump when liquid drops below the sensor. For an overflow alarm, the buyer may want a signal when liquid reaches the upper point. In safety-related designs, the control engineer should decide whether the normal state should be energized or de-energized so that cable failure, sensor failure, or power loss does not create an unsafe assumption.

Wetted Materials and Liquid Compatibility

The wetted parts decide whether the sensor can survive the liquid. Buyers often compare Alimentation, PTFE, 316 Acier inoxydable, et verre because each material behaves differently with water, huile, combustible, Liquide de refroidissement, chemical liquids, Produits de nettoyage, and temperature cycles.

For the current standard listed configuration, the confirmed housing material is SUS316 and the sensing tip is verre. This combination is useful where corrosion resistance, mechanical durability, and a stable optical prism surface are required. PTFE may be considered for more aggressive chemical environments, while PSU-style housings may be relevant for compact or cost-sensitive OEM applications, but material availability and suitability should be confirmed during RFQ.

Avant de commander, share the liquid name, Concentration, température, whether the liquid leaves residue, whether the tank is cleaned with chemicals, and whether the sensor tip may be exposed to oil film, scale, écume, or suspended particles. Optical sensors work best when the prism surface can clearly transition between air and liquid.

Température, Pression, IP Rating and Mounting

The confirmed operating temperature range is -10~80℃. This should be checked against both the liquid and the surrounding equipment temperature. A tank in a warm factory may still be within range, while a boiler-side, sterilization, or high-temperature cleaning environment may need a separate model review.

Pressure rating is marked TBC because it depends on the mechanical structure, Phoque, fil, and final model configuration. If the sensor will be used in a closed tank, pump line, fuel system, coolant circuit, or vessel with pressure fluctuation, pressure must be confirmed before sample approval.

The confirmed IP rating is IP67, which supports many equipment and industrial installations when the cable exit, Connecteur, and installation method are protected properly. IP rating should not be treated as chemical compatibility or unlimited submersion permission; it is only one part of the environmental selection.

Mounting threads include 1/2” NPT, G1/2, and 3/8” NPT. Choose the thread according to tank boss design, Épaisseur du mur, gasket method, liquid direction, and available space for the cable. For OEM tanks, confirm whether the sensor installs horizontally from the side wall, vertically from the top, or into a custom chamber.

Application Mapping Table

How to Specify an Optical Level Sensor

Use this checklist before requesting the optical level sensor datasheet or a factory quote.

1. Confirm the liquid: eau, huile, combustible, Liquide de refroidissement, chemical mixture, eaux usées, or another liquid.
2. Confirm the function: Alarme de haut niveau, Alarme de bas niveau, Protection contre les essais à sec, Prévention des débordements, or OEM status detection.
3. Confirm electrical input: 5V, 12V, 24V, Entrée API, Entrée MCU, Module relais, or control board.
4. Choose output type: NPN ou PNP.
5. Choose switching logic: NO or NC.
6. Confirm load current requirement and whether the sensor only sends a signal or drives another device.
7. Confirm material needs: SUS316, verre, PTFE, Alimentation, or custom discussion.
8. Confirm tank mounting: 1/2” NPT, G1/2, 3/8” NPT, Montage latéral, Montage supérieur, or OEM structure.
9. Confirm temperature and pressure conditions.
10. Share drawing, Quantité cible, cable/connector preference, labeling needs, and export destination.

Common Failure Modes to Avoid

Most optical level sensor problems are not caused by the sensing principle itself. They usually come from mismatch between the specification and the application.

A wrong NPN/PNP choice can prevent the controller from reading the signal. A wrong NO/NC choice can reverse the alarm logic. A liquid that coats the prism can delay or block the optical transition. Air bubbles, écume, or turbulent liquid can create unstable switching near the sensing point. A thread mismatch can cause leakage. A pressure condition that was not disclosed can affect sealing. A load above ≤ 100mA can damage the output circuit.

The safest approach is to approve the specification, câblage, Dessin, and sample test before batch production.

HojellyTek Manufacturing Support

HojellyTek est un fabricant et exportateur de Shenzhen spécialisé dans la détection optique photoélectrique, Détection des niveaux liquides, and OEM/ODM sensor projects. Notre R interne&D team supports model selection, wiring confirmation, material review, and customization discussions for equipment manufacturers, Distributeurs, and industrial buyers.

For broader model details, review the Produit capteur de niveau optique Page, then send your application requirements by WhatsApp or email for confirmation.

FAQ

What should an optical level sensor specification include?

An optical level sensor specification should include supply voltage, Actuel, Type de sortie, Courant de charge, switching logic, response requirement, Matériaux humides, Température de fonctionnement, Condition de pression, Taille du filetage, Direction de montage, Indice IP, cable/connector needs, and the target liquid.

Is 5–24VDC suitable for my controller?

It may be suitable if your control board, PLC, or input module works within that supply range. You still need to confirm NPN/PNP output, Logique NO/NC, Courant de charge, and wiring method before ordering.

Can one sensor detect both water and oil?

Optical sensors can be used in different liquids, but the liquid’s optical behavior, coating tendency, viscosité, température, and chemical compatibility must be reviewed. Eau, huile, and fuel projects should not be treated as identical without sample testing.

What is the difference between SUS316, PTFE, PSU and glass?

SUS316 is commonly selected for corrosion resistance and mechanical strength. Glass is used as the optical prism tip. PTFE may be considered for aggressive chemicals. PSU-style material may suit some OEM designs. Final material selection should match the liquid and installation.

Do optical level sensors measure continuous level?

Standard optical point level sensors detect whether liquid is present at a fixed sensing point. If your project requires continuous level measurement or 4–20 mA output, state that clearly during RFQ so the correct solution can be reviewed.

Why are pressure and switching response marked TBC?

They depend on the exact model, Phoque, mechanical structure, and project conditions. Instead of inventing figures, we confirm pressure rating and switching response during datasheet review, sample approval, or custom specification discussion.

Download Datasheet or Request a Quote

To receive the correct datasheet, Dessin, wiring guide, and quotation, send your liquid type, Tension, Exigence de production, Taille du filetage, Direction de montage, Préférence en matière, température, Condition de pression, and estimated quantity.

Contact HojellyTek by WhatsApp or email to request a datasheet, sample discussion, or OEM/ODM quote for your optical level sensor project.