Capteur de niveau optique pour réservoirs de liquide de refroidissement

An optical level sensor coolant tank solution helps prevent low-coolant overheating, pump dry running, Cavitation, and unexpected machine shutdown before the reservoir reaches a dangerous level. For machine tools, moteur, chillers, cooling skids, and industrial reservoirs, HojellyTek supplies compact photoelectric level sensors for low-level alarm detection, coolant presence confirmation, and OEM coolant tank integration.

L’objectif est simple: detect whether coolant is present at the safe minimum level, then send a reliable signal to a PLC, Carte de contrôle, Relais, buzzer, warning lamp, or shutdown circuit.

Coolant Tank Level Detection Capabilities

HojellyTek optical sensors are designed for point-level detection in compact tanks and industrial reservoirs where float switches may be too bulky, mechanically unreliable, or sensitive to vibration.

For coolant tank applications, Nous pouvons soutenir:

• Low-coolant alarm detection in CNC machine tool coolant reservoirs
• Pump inlet protection for coolant circulation pumps
• Engine coolant reservoir level monitoring for industrial equipment
• Chiller tank low-level alarm detection
• Cooling lubricant level monitoring in metalworking systems
• OEM/ODM sensor customization for tank builders and equipment manufacturers
• Photoelectric sensing modules with custom cable, Connecteur, Sortie, and housing options
• Sensor selection based on coolant type, Matériau du réservoir, Position de montage, et logique de contrôle

If your application needs a general point-level sensor platform, voir notre Capteur de niveau optique options for standard liquid detection projects.

Preventing Low-Coolant Overheating and Pump Damage

In coolant systems, the level sensor is not just a monitoring accessory. It is a protection device. When coolant drops below the safe level, the system can lose cooling capacity, the pump may pull air, and the machine may continue running without enough fluid to remove heat.

Common failures a low-level optical sensor helps prevent include:

• Pump dry running when the coolant tank level falls below the suction point
• Overheating in machine tools, moteur, or chillers
• Poor coolant circulation caused by air intake or cavitation
• Tool wear or process instability due to insufficient cooling flow
• Chiller low-level faults and emergency shutdowns
• Unplanned downtime caused by delayed manual inspection
• Pump seal damage from repeated operation without enough liquid

For pump-focused applications, our related Protection contre la pompe contre le fonctionnement à sec page explains how point-level sensing can be used as an interlock before the pump runs in unsafe conditions.

How the Optical Sensor Detects Coolant Level

A photoelectric coolant level sensor typically uses an infrared LED, un phototransistor, et une pointe sensorielle en forme de prisme. The sensing tip is installed at the target alarm level inside or through the wall of the coolant reservoir.

Quand la pointe du prisme est dans l’air, La lumière infrarouge se réfléchit à l’intérieur du prisme et revient au récepteur. When coolant covers the prism, the light refracts into the liquid instead of reflecting back. The sensor electronics detect this change and switch the output state.

This dry-versus-wetted detection method gives several advantages in coolant tanks:

• No moving float arm to jam, Bâton, or wear
• Compact sensing tip for small reservoirs
• Fast point-level response at the set mounting height
• Stable detection for many water-based, glycol-based, and oil-based liquids
• Easy low-level alarm integration with electronic control systems
• Suitable for horizontal side mounting or custom tank integration

The sensor does not analyze coolant quality or chemical formula. Its job is level detection: whether the sensing tip is dry or wetted at the alarm point.

Coolant Compatibility and Temperature Selection

Coolant compatibility depends on the liquid type, Concentration, Additifs, température, pression, Procédé de nettoyage, and wetted material. Pour cette raison, the sensor body and prism material should be selected according to the real coolant used in the tank, not only the application name.

Common wetted-material options include PSU plastic, PTFE, 316 Acier inoxydable, et verre. For high-temperature reservoirs, heated coolant loops, or harsh industrial fluids, the model and cable material should be reviewed before sampling. For elevated-temperature applications, voir notre capteur optique haute température selection page.

Liquide de refroidissement / Type de liquide	Typical Use Case	Suggested Sensor Material Direction	Temperature Consideration	Buyer Check Before Ordering
Water-based coolant	CNC machine tools, machining centers, general cooling tanks	PSU or stainless/glass depending on additives and tank design	Confirm normal operating and cleaning temperature	Check foam, chips, additive concentration, and alarm height
Glycol-based coolant	Chillers, cooling skids, engine-related industrial reservoirs	Alimentation, PTFE, or stainless/glass after compatibility review	Confirm low-temperature and high-temperature operating range	Share glycol concentration and reservoir temperature range
Oil-based coolant / cutting oil	Metalworking, lubrication-cooling systems	PTFE or 316 stainless/glass often preferred for harsher fluids	Confirm viscosity change at operating temperature	Test with actual oil/coolant sample before bulk order
Cooling lubricant emulsion	Machine tool coolant tanks	Material selection depends on emulsion chemistry and contamination level	Confirm if the tank runs warm during continuous operation	Check sludge, écume, chips, et méthode de nettoyage
Chiller water / process coolant	Industrial chillers and process cooling reservoirs	PSU or stainless/glass depending on fluid and installation	Confirm chiller temperature cycle and alarm response requirement	Check low-level alarm logic and pump interlock wiring
Harsh or unknown coolant	OEM machines, special process equipment	PTFE, 316 Inox, or glass should be reviewed first	Temperature range must be confirmed at RFQ stage	Send coolant details or request sample validation

For corrosive, haute température, or metal tank applications, a 316 capteur en inox may be more suitable than a plastic-bodied sensor.

Low-Level Alarm Wiring for Coolant Reservoirs

Most coolant tank projects use the optical sensor as a low-level switch. The output can be configured to match the machine control system, Tableau d’alarme, PLC, ou interface relais.

Common output choices include:

• Sortie NPN for sinking input circuits
• Sortie PNP for sourcing input circuits
• NO or NC logic depending on whether the alarm should trigger when the tip is dry or wetted
• Relay interface when the machine needs isolated switching
• Warning lamp or buzzer output through a control circuit
• Pump stop interlock to prevent dry running
• 4Sortie de –20 mA when a continuous level sensor is selected instead of a point-level switch

For low-coolant protection, many buyers prefer fail-safe logic: when the sensor is disconnected, damaged, or detects a dry tip, the machine should enter alarm or stop mode instead of continuing silently. This logic should be confirmed with your control engineer before production.

Mounting the Sensor in a Coolant Tank

The mounting position decides how useful the alarm will be. A sensor installed too low may detect the problem only after the pump has already started pulling air. A sensor installed too high may create frequent nuisance alarms even when the system still has enough usable coolant.

For most coolant reservoirs, the sensor should be mounted at the minimum safe level above the pump inlet or suction point. The exact height depends on tank geometry, pump location, fluid movement, and how much reserve volume is needed before shutdown.

Important mounting points include:

• Install the sensing tip at the real low-level alarm height
• Keep the tip away from heavy chip accumulation and sludge zones
• Avoid mounting where foam or strong turbulence constantly hits the prism
• Use a sealing method suitable for the tank wall and coolant type
• Confirm thread size, Direction du câble, and installation clearance
• Protect the cable from hot surfaces, pièces mobiles, cutting chips, and coolant spray
• For metal tanks, confirm grounding, electrical noise, and connector protection
• For plastic tanks, confirm wall thickness and thread strength

Typical mounting options include threaded side mounting, custom tank boss installation, compact internal mounting, or OEM reservoir integration. Fil, Longueur du câble, Style de connecteur, and housing material can be customized during the RFQ stage.

Low-Level Alarm Checklist Before Ordering

Before selecting an optical sensor for coolant tank monitoring, Préparez les informations suivantes:

• Coolant type: water-based, glycol-based, oil-based, emulsion, chiller water, ou autre
• Actual coolant brand or sample if compatibility is uncertain
• Normal operating temperature and maximum cleaning or process temperature
• Matériau du réservoir et épaisseur des parois
• Style de montage: Mur latéral, threaded boss, Bride, ou porte-douane
• Required alarm level measured from the tank bottom or pump inlet
• Type de sortie: NPN, PNP, Relais, or analog continuous signal
• Alarm logic: normally open or normally closed
• Supply voltage required by the machine control board
• Connection target: PLC, Relais, buzzer, warning lamp, ou interverrouillage à pompe
• Longueur du câble, Type de connecteur, and cable jacket requirement
• Exposure to vibration, cutting chips, écume, Brume huileuse, or coolant spray
• Required sensor body material: Alimentation, PTFE, 316 Acier inoxydable, ou verre
• Sample quantity and test plan before production order

5-Processus de Service en étapes

1. Enquête

Send us your coolant tank application, Type liquide, Dessin ou photo du char, alarm height, and wiring requirement by WhatsApp or email.

2. Spécification et personnalisation

Our engineering team reviews wetted material, Filetage de montage, Type de sortie, Câble, Connecteur, et logique d’alarme. Pour les projets OEM/ODM, we can support custom sensor structure and wiring.

3. Tests d’échantillons

Samples can be prepared for validation with your real coolant, réservoir, Carte de contrôle, and alarm circuit. This step is important for glycol-based, oil-based, haute température, or additive-rich coolants.

4. Production et contrôle qualité

Après confirmation de l’échantillon, the factory produces according to the agreed configuration. QC focuses on sensor function, État de sortie, Scellement, cable quality, and appearance.

5. Transport maritime et soutien

We export sensors for customers in the US, EU, Inde, et autres marchés. Support can include wiring confirmation, installation suggestions, and model selection for future projects.

Requirements and Specification Points to Confirm

Exigence	Pourquoi ça compte
Coolant type	Determines wetted material and sample testing need
Plage de température	Affects sensor body, Prisme, Scellement, and cable choice
Mounting thread or structure	Ensures the sensor fits the reservoir without leakage
Alarm point height	Prevents overheating and pump dry running before damage
Type de sortie	Indispensable pour un API, Relais, Tableau d’alarme, ou une entrée contrôleur
Logique NO/NC	Determines when the low-level alarm is triggered
Câble et connecteur	Must suit the machine layout and service environment
Tank environment	Chips, écume, vibration, boue, and spray can affect installation design

Optical Sensor vs Float Switch for Coolant Tanks

Objet	Capteur de niveau optique	Interrupteur à flotteur
Méthode de détection	IR photoelectric prism detects dry or wetted state	Mechanical float moves with liquid level
Pièces mobiles	No moving sensing mechanism	Moving float can stick or wear
Taille	Compact, suitable for small tanks and OEM reservoirs	Often needs more internal space
Coolant contamination	Needs correct mounting away from sludge or heavy chips	Float may jam with chips, saleté, or sticky residue
Câblage	NPN, PNP, Interface de relais, ou une entrée contrôleur	Usually simple switch output
Meilleure utilisation	Electronic low-level alarm, Réservoirs compacts, OEM designs	Des chars simples où le mouvement mécanique est acceptable

Pourquoi choisir HojellyTek

HojellyTek est un fabricant de capteurs optiques et de niveau liquide de Shenzhen disposant d’un système R interne&D and photoelectric sensing experience. We support OEM/ODM customization for coolant tank monitoring, compact equipment reservoirs, industrial control systems, and smart device integrations where relevant.

Les acheteurs travaillent avec nous pour:

• Factory-direct sensor development and export support
• Optical level switch design for compact tanks
• Câble personnalisé, Connecteur, fil, et configuration de sortie
• Material options including PSU, PTFE, 316 Acier inoxydable, et verre
• Application support for machine tools, moteur, chillers, and pump protection
• Export experience with customers in the US, EU, Inde, et autres marchés

FAQ

Can an optical level sensor coolant tank solution detect low coolant before pump damage?

Oui. The sensor is mounted at the minimum safe coolant level. When the prism tip becomes dry, the output changes state and can trigger an alarm, Entrée API, Relais, buzzer, warning lamp, or pump stop interlock.

Will an optical level sensor work with glycol-based coolant?

It can be used for many glycol-based coolant applications, but compatibility should be confirmed by coolant concentration, température, Additifs, and wetted material. Pour les projets OEM, testing with the actual coolant is recommended.

Can the sensor detect oil-based coolant or cutting oil?

Oui, optical level sensing can be used with oil-based coolant or cutting oil when the correct sensor material and mounting position are selected. PTFE, Acier inoxydable, or glass options may be considered for harsher fluids.

Where should the sensor be mounted in a coolant reservoir?

Mount it at the required low-level alarm height, usually above the pump inlet or suction point. Avoid sludge zones, chip accumulation areas, strong turbulence, and positions where foam may cause nuisance alarms.

Should I choose NPN or PNP output for a coolant tank sensor?

Choose the output that matches your PLC, Carte de contrôle, ou circuit d’alarme. NPN and PNP are both common. NO/NC logic should also be confirmed so the machine reacts correctly when coolant level is low.

Is 4–20 mA required for coolant tank level monitoring?

Pas toujours. For a simple low-level alarm, an optical point-level switch with NPN, PNP, or relay interface is usually enough. Use 4–20 mA only when your system needs continuous level measurement instead of one alarm point.

Request a Coolant Tank Sensor Quote

Send your coolant type, tank photo or drawing, alarm height, Filetage de montage, Type de sortie, Exigence de tension, and cable/connector preference to HojellyTek by WhatsApp or email. Our team will help select or customize an optical coolant level sensor for machine tools, moteur, chillers, and OEM reservoir systems.