High-Temperature Optical Liquid Level Sensor
HojellyTek manufactures photoelectric liquid level sensing solutions in Shenzhen for OEM/ODM and industrial buyers who need material guidance before ordering samples or production batches.
High-Temperature Optical Level Sensing Capabilities
Our high-temperature optical level sensor service covers point level detection for hot-media applications where float switches may jam, absorb residue, or wear mechanically. સેન્સર ઇન્ફ્રારેડ એલઇડીનો ઉપયોગ કરે છે, ફોટોટ્રાન્ઝિસ્ટર, and optical prism tip to detect whether the prism is dry or covered by liquid.
શુષ્ક અવસ્થામાં, ઇન્ફ્રારેડ પ્રકાશ પ્રિઝમની અંદર આંતરિક રીતે પરાવર્તિત થાય છે અને રીસીવર પર પાછો ફરે છે. જ્યારે પ્રવાહી પ્રિઝમને આવરી લે છે, વક્રીભવનની સ્થિતિ બદલાય છે, light is redirected into the liquid, and the output changes state. This makes optical sensing useful for high-level alarm, નીચા સ્તરનું એલાર્મ, ડ્રાય રન પ્રોટેક્શન, coolant tank level detection, oil reservoir monitoring, and compact OEM tank integration.
Depending on the project, we support:
- Photoelectric point level sensing for hot liquid detection
- PSU, 316 સ્ટેઈનલેસ સ્ટીલ, ગ્લાસ, PTFE, and mixed-material structures
- NPN, PNP, and digital switch output options
- 4–20 mA discussion for continuous level or transmitter-based projects
- થ્રેડેડ થ્રેડેડ, સંકુચિત, side-mount, તળિયે-માઉન્ટ, and customized mounting structures
- OEM cable length, કનેક્ટર, આઉટપુટ તર્ક, and housing design
- Sample testing before mass production for hot-media applications
For general optical point level selection, જુઓ અમારું ઓપ્ટિકલ લેવલ સેન્સર વિસ્તાર.
The Real Failure Risk: Plastic Prisms and Seals Above Rating
High-temperature buyers usually ask for the maximum temperature first. That is understandable, but a single “max temperature” number can be misleading if it only describes one part of the sensor.
A plastic prism may survive a short hot splash but deform during continuous immersion. A seal may harden, swell, or lose compression before the metal housing fails. A cable jacket may crack near a hot tank wall even if the sensor tip is still functional. Potting compound, adhesive, connector plastic, and internal electronics can also become the real limit.
આ કારણથી, HojellyTek does not recommend selecting a hot-liquid sensor by body material alone. A stainless steel body does not automatically mean the cable, છાપ, optical window, and electronics share the same ceiling. A glass tip can handle harsher media than many plastics, but the assembly still needs a confirmed seal and cable design.
The safe way to specify a hot-media optical sensor is to confirm:
- Normal continuous liquid temperature
- Maximum peak temperature
- How long peak temperature lasts
- Whether the sensor tip, થ્રેડ, કેબલ, or connector is exposed to heat
- Whether the liquid is water, કૂલન્ટ, તેલ, chemical solution, અથવા મિશ્રિત માધ્યમો
- Whether pressure, સ્પંદન, ફીણ, પરપોટા, or cleaning cycles are present
Temperature Ceiling by Material: PSU vs 316SS vs Glass/PTFE
For high-temperature optical liquid level sensor projects, the “real ceiling” must be confirmed from the complete sensor build, not assumed from one raw material. The table below is designed for buyer selection, not as a published temperature claim.
| Sensor Material / બાંધકામ | બેસ્ટ ફિટ | Temperature-Rating Guidance | Main Risk to Check |
|---|---|---|---|
| PSU plastic optical prism or body | Compact OEM tanks, water-based liquids, lower-cost projects | Suitable only when the confirmed continuous and peak rating of the exact part matches the application. Do not assume “engineering plastic” means safe for all hot tanks. | Prism softening, ક્રેકિંગ, swelling, seal stress, long-term deformation |
| 316 stainless steel housing with optical tip | Hot coolant, તેલ, ઔદ્યોગિક ટાંકીઓ, stronger mechanical protection | Body durability is stronger than plastic, but the actual ceiling depends on the optical tip, છાપ, કેબલ, and internal assembly. | Seal aging, cable de-rating, heat transfer to electronics |
| Glass optical sensing tip | Hot water, તેલ, રસાયણો, and applications where plastic prism compatibility is a concern | Often selected when buyers need a more stable optical interface than plastic. The real ceiling must still be confirmed by full assembly design. | Glass-to-metal sealing, shock, installation stress, cable exposure |
| PTFE wetted parts with glass sensing area | Chemical media, કાટવાળા પ્રવાહી, applications needing low surface adhesion | PTFE may improve chemical compatibility, but chemical resistance and temperature rating must be checked separately. | Seal compatibility, mechanical rigidity, media permeation, cable limit |
| Mixed custom assembly | OEM tanks with strict space, વાયરીંગ, and media requirements | Best handled as an RFQ-based design where material, છાપ, કેબલ, આઉટપુટ, and mounting are specified together. | One component in the assembly becoming the limiting point |
For buyers who need a non-plastic sensing face, અમારું ગ્લાસ ઓપ્ટિકલ સેન્સર page is a useful reference. For harsher industrial housings, સમીક્ષા કરો 316 સ્ટેનલેસ ઓપ્ટિકલ સેન્સર વિકલ્પ.
Continuous Temperature vs Peak Temperature
Continuous temperature is the temperature the sensor must survive during normal operation for long periods. Peak temperature is a short event, such as startup heat, સફાઈ, flushing, or temporary overheating.
This distinction matters because many failures do not happen instantly. A plastic prism may pass a short bench test but slowly craze after weeks in hot coolant. A seal may pass room-temperature leak testing but lose elasticity after repeated heating and cooling. Cable insulation may remain flexible at first, then harden and crack after long exposure near a tank wall.
When sending an RFQ, do not write only “high temperature.” Send the continuous operating temperature, maximum peak temperature, peak duration, and whether the sensor is immersed continuously or only exposed during filling. If the application includes CIP cleaning, વરાળ, hot detergent, oil additives, or glycol coolant, include that information before sample selection.
Cable Rating, Connector De-Rating, and Installation Heat
In hot tanks, the sensor tip is not the only exposed part. Cable routing can decide whether the project succeeds.
A cable rated for normal ambient conditions may fail if it touches a hot metal tank, runs beside a heater, or exits through a hot enclosure. The cable may need higher-temperature insulation, extra strain relief, a cooler routing path, or a metal body design that reduces direct heat transfer to the cable entry.
Connector selection also matters. M8, M12, plug-in connectors, flying leads, and custom harnesses have different heat limits. If the connector sits outside the hot zone, the design may be easier. If the connector is close to the tank wall, the connector material and sealing must be checked together.
For high-temperature applications, buyers should confirm:
- Cable jacket material and heat exposure area
- Distance from hot tank wall to connector
- Whether the cable is fixed, flexing, અથવા વાઇબ્રેશનના સંપર્કમાં આવે છે
- Whether oil, કૂલન્ટ, or cleaning chemical contacts the cable
- Whether output wiring uses NPN, PNP, or another control interface
- Whether the control board needs normally open, સામાન્ય રીતે બંધ છે, high-in-liquid, or low-in-liquid logic
Hot-Media Application Checklist
Use this checklist before requesting a quote or sample:
| RFQ વસ્તુ | શું પ્રદાન કરવું |
|---|---|
| પ્રવાહી પ્રકાર | પાણી, કૂલન્ટ, તેલ, ડિટર્જન્ટ, chemical solution, અથવા મિશ્રિત માધ્યમો |
| Continuous temperature | Normal long-term operating temperature of the liquid |
| Peak temperature | Highest expected temperature and exposure duration |
| માઉન્ટ સ્થાન | બાજુ માઉન્ટ, તળિયે માઉન્ટ, top entry, or custom tank wall design |
| ભીની સામગ્રી પસંદગી | PSU, 316 સ્ટેઈનલેસ સ્ટીલ, ગ્લાસ, PTFE, or factory recommendation |
| Seal requirement | Media compatibility, દબાણની સ્થિતિ, and cleaning cycle |
| Cable exposure | Hot-zone length, connector distance, and routing environment |
| આઉટપુટ પ્રકાર | NPN, PNP, switch output, or transmitter discussion |
| વીજ પુરવઠો | Control board voltage confirmed at RFQ stage |
| Application goal | ઉચ્ચ-સ્તરનું એલાર્મ, નીચા સ્તરનું એલાર્મ, ડ્રાય રન પ્રોટેક્શન, લીક શોધ, or OEM tank control |
| Sample validation | Bench test, hot-liquid soak test, and installation test before production |
For hot coolant and reservoir projects, ધ કૂલન્ટ ટેન્ક સેન્સર page gives application context for compact tank monitoring.
5-Step OEM/ODM Supply Process
1. પૂછપરછ
પ્રવાહી મોકલો, temperature profile, માઉન્ટ સ્થાન, આઉટપુટ આવશ્યકતા, ચિત્ર દોરવું, ફોટો, or existing part sample. Our team reviews whether a standard optical switch, stainless version, glass version, or customized structure is more suitable.
2. વિશિષ્ટતા અને વૈવિધ્યીકરણ
We confirm the practical sensor configuration: ભીની સામગ્રી, થ્રેડ, કેબલ, આઉટપુટ તર્ક, કનેક્ટર, છાપ, and whether the temperature ceiling must be validated by sample testing.
3. નમૂનો
Samples are prepared for electrical testing, immersion testing, and installation checks. For hot-media projects, we recommend testing under real liquid temperature and duty-cycle conditions.
4. ઉત્પાદન અને ક્યુસી
નમૂનાની મંજૂરી પછી, ઉત્પાદન પુષ્ટિ થયેલ ડ્રોઇંગ અને સ્પષ્ટીકરણને અનુસરે છે. ક્યુસીમાં દેખાવનું નિરીક્ષણ શામેલ હોઈ શકે છે, wiring check, output function check, સીલિંગ ચકાસણી, and application-specific testing agreed before production.
5. વહાણખોરી
HojellyTek exports sensor products to the US, અમે, ભારત, અને અન્ય બજારો. વહાણખોરી, પેકેજીંગ, લેબલીંગ, and documentation can be discussed based on the buyer’s order and destination.
Requirements and Specs to Confirm Before Ordering
A reliable high-temperature optical sensor order should confirm more than the sensor body. At minimum, define:
- સેન્સર પ્રકાર: point level optical switch or continuous level project
- ભીની સામગ્રી: PSU, 316 સ્ટેઈનલેસ સ્ટીલ, ગ્લાસ, PTFE, અથવા વૈવિધ્યપૂર્ણ
- આઉટપુટ: NPN, PNP, digital switch output, or 4–20 mA discussion
- આઉટપુટ તર્ક: active in liquid or active in air
- માઉન્ટ કરી રહ્યા છીએ: થ્રેડ, ફ્લેન્જ, બાજુની દિવાલ, તળિયે માઉન્ટ, or compact OEM structure
- કેબલ: લંબાઈ, jacket material, કનેક્ટર, and heat exposure
- સીલ: compatibility with liquid and temperature cycle
- Electrical integration: સપ્લાય વોલ્ટેજ, લોડ, નિયંત્રક, PLC, or PCB input
- Media behavior: ફીણ, પરપોટા, આવરણ, તેલ ફિલ્મ, અવશેષો, રંગ, or viscosity
- Validation plan: sample test conditions before batch production
Material and Application Comparison
| Application Situation | Better Starting Option | શા માટે |
|---|---|---|
| Compact plastic tank with warm liquid | PSU optical sensor if confirmed suitable | ખર્ચ-અસરકારક અને કોમ્પેક્ટ, but must stay inside the real material and seal rating |
| Hot coolant reservoir | 316 stainless or glass-tip design | Better choice where heat, additives, and vibration are concerns |
| Hot oil tank | Stainless housing with suitable optical tip and cable | Oil compatibility, કેબલ જેકેટ, and seal material must be checked carefully |
| Corrosive hot chemical | Glass/PTFE discussion | Chemical resistance and temperature must both be validated |
| Buyer only knows “hot liquid” | RFQ-based material selection | The factory needs media, continuous temperature, peak temperature, and mounting details before quoting safely |
હોજેલીટેક શા માટે પસંદ કરો
હોજેલીટેક એ શેનઝેન ઉત્પાદક અને નિકાસકાર છે જે ફોટોઇલેક્ટ્રિક ઓપ્ટિકલ લિક્વિડ લેવલ સેન્સિંગ પર ધ્યાન કેન્દ્રિત કરે છે. અમે ઇન-હાઉસ આરને ટેકો આપીએ છીએ&D, OEM/ODM વૈવિધ્યીકરણ, કોમ્પેક્ટ સેન્સર સ્ટ્રક્ચર્સ, industrial material selection, and application-based sample validation.
Buyers work with us when they need a practical factory-direct sensor partner rather than a catalog-only supplier. We can help compare PSU, 316 સ્ટેઈનલેસ સ્ટીલ, ગ્લાસ, and PTFE options, adjust cable and output details, and support OEM integration for tanks, ઉપકરણો, ઔદ્યોગિક સાધનો, કૂલન્ટ સિસ્ટમ્સ, and smart liquid monitoring products. Tuya and Smart Life integration can also be discussed where the project requires connected liquid monitoring instead of a simple wired switch.
ચપળ
What is the real maximum temperature of a high temperature optical liquid level sensor?
The real maximum temperature depends on the complete assembly: પ્રિઝમ, આવાસ, છાપ, કેબલ, કનેક્ટર, potting, and liquid compatibility. We do not recommend choosing by one headline number. Send your continuous and peak temperature requirements so the correct ceiling can be confirmed.
Is continuous temperature different from peak temperature?
હા. Continuous temperature is long-term normal exposure. Peak temperature is a short event. A sensor may survive a short peak but fail in continuous immersion if the prism, છાપ, or cable is not rated for that duty cycle.
Which material is best for hot liquid: PSU, 316 સ્ટેઈનલેસ સ્ટીલ, ગ્લાસ, or PTFE?
PSU can suit compact OEM applications when confirmed within rating. 316 stainless steel improves mechanical durability. Glass is often preferred when plastic compatibility is a concern. PTFE is useful for chemical compatibility, but temperature and sealing still need confirmation.
Can optical level sensors work in hot coolant tanks?
હા, optical sensors can be used for coolant level detection when the material, છાપ, કેબલ, and output are selected correctly. Coolant additives, temperature cycle, સ્પંદન, and mounting position should be shared before sample selection.
Are optical sensors continuous level sensors?
Most optical prism sensors are point level switches. They detect whether the tip is dry or wetted. If your project needs continuous measurement or 4–20 mA output, discuss a separate continuous level or transmitter-based solution.
અવતરણની વિનંતી કરતા પહેલા મારે શું મોકલવું જોઈએ?
Send liquid type, continuous temperature, peak temperature, માઉન્ટ કરવાની પદ્ધતિ, ટાંકી સામગ્રી, થ્રેડની આવશ્યકતા, કેબલ લંબાઈ, જોડનાર પ્રકાર, આઉટપુટ પ્રકાર, and target order quantity. ફોટા, રેખાંકનો, or an existing sensor sample are also helpful.
અવતરણની વિનંતી કરો
For a high-temperature optical liquid level sensor, the safest first step is to confirm the real ceiling of the complete sensor assembly before ordering. Send your hot-media checklist, ટાંકી ચિત્ર, and wiring requirement to HojellyTek by WhatsApp or email, and our team will recommend a suitable material, આઉટપુટ, કેબલ, and sample plan.
