Food-Grade Optical Liquid Level Sensor
深センの製造・輸出業者として、社内Rを有しています&D, we support OEM/ODM sensor configuration for PSU, PTFEおよび 316 stainless steel wetted designs, with food-contact documentation confirmed at the RFQ stage.
Food and Beverage Level Sensing Capabilities
Our optical liquid level sensors are used for point-level detection in tanks, 小さな貯水池, dispensing systems and process equipment. Depending on the installation, the sensor can support overflow prevention, 低レベル警報, ポンプ保護, fill confirmation or dosing tank monitoring.
Typical capabilities include:
- Photoelectric optical sensing using an IR emitter, receiver and prism sensing tip
- Compact sensor bodies for OEM appliance integration
- PSU, PTFE製, 316 stainless steel or glass-interface options depending on liquid and cleaning conditions
- NPN, PNP, digital switch or 4–20 mA output options depending on control system requirements
- ねじ込み式, tank-mounted or customized mechanical structures
- ケーブル, connector and housing customization for OEM production
- Support for food, beverage, dairy, 水, コーヒー, syrup and dosing applications after sample validation
For buyers comparing the general sensing principle, 私たちの 光学レベルセンサー ページ.
Compliance Starts with the Wetted Surface
In food and beverage projects, the key question is not simply “does the sensor detect liquid?” The first question is whether every wetted part is suitable for the process. The sensor body, プリズム, 印章, ガスケット, 糸, adhesive exposure and cable entry must be reviewed before the part is approved for food-contact equipment.
Optical level sensors work by sending infrared light through a prism tip. 乾燥状態で, light reflects internally inside the prism and returns to the receiver. 液体が先端を覆うとき, 屈折条件が変化します, そのため受信側に戻る光は少なくなります. The electronics convert this change into a level signal.
This method is useful because there are no moving floats, no magnetic reeds and no mechanical hinge points in the sensing area. For food and beverage equipment, that can reduce moving-part wear and simplify compact mounting. しかし, hygienic performance still depends on the actual wetted material, sensor geometry and cleaning process.
Food-contact compliance documents such as FDA, ECプログラム 1935/2004, LFGB, 3-A or EHEDG should be confirmed with HojellyTek before use in regulated food-contact equipment. We do not recommend publishing certification claims until the relevant material declarations or test documents are checked for the exact sensor model and configuration.
Food-Contact Material Options
Different food and beverage applications need different wetted materials. A coffee machine reservoir, dairy tank, syrup dosing system and cleaning-fluid tank may all require different sensor bodies.
| 濡れた物質 | Typical food/beverage use | 強み | Confirm before ordering |
|---|---|---|---|
| PSU / PPSU-style engineering plastic | Coffee machines, drinking water tanks, beverage dispensers, small OEM reservoirs | 軽量化, コンパクト, suitable for molded sensor structures, good for appliance integration | Food-contact declaration, hot-water exposure, detergent compatibility, mounting strength |
| PTFE製 | Dosing tanks, 洗浄液, acidic/alkaline liquids, sticky ingredients, chemical-contact zones | 強い化学耐性, low surface adhesion, useful where aggressive liquids may contact the sensor | Mechanical mounting, シーリング方法, food-contact evidence, cleaning temperature |
| 316 ステンレススチール | Process tanks, beverage lines, dairy equipment, wash-down areas | Durable housing, strong mechanical protection, suitable for industrial food equipment design | Surface finish, シール材料, weld or thread hygiene, actual grade documentation |
| ガラスプリズム / optical interface | Optical sensing tip or transparent detection interface | Stable optical surface, clean sensing point, good optical transmission | Breakage risk, residue behavior, 洗浄プロセス, installation protection |
| 印章 / ガスケット素材 | Process connection, 漏れ防止, food-contact boundary | Critical for hygiene, cleaning survival and pressure sealing | EPDM/FKM/PTFE suitability, 温度曝露, detergent and steam compatibility |
For aggressive ingredients, cleaning fluids or low-adhesion wetted surfaces, ある PTFE光学センサー may be more suitable than a plastic-bodied option. For industrial tanks, wash-down zones or stronger mechanical protection, ある 316 ステンレスセンサー may be the better starting point.
CIP, SIP, Hot-Fill and Wash-Down Survival
Food and beverage sensors often fail because the ordering specification only describes the liquid, not the cleaning cycle. A sensor that works in room-temperature water may not survive repeated hot-fill, caustic wash, acid rinse, steam exposure or pressure wash-down.
Before choosing a food-grade optical liquid level sensor, 確認してください:
- Normal product temperature during operation
- Maximum hot-fill or pasteurization exposure near the sensor
- CIP or SIP cleaning temperature and duration
- Whether steam touches the sensing tip or only the tank wall
- Cleaning chemicals, concentration and rinse sequence
- Wash-down pressure near the cable exit and connector
- Whether the sensor is submerged continuously or only during filling
- Whether residue dries on the prism after draining
Optical sensing depends on a clean optical interface. If milk solids, シロップ, 油絵フィルム, fruit pulp, crystallized sugar or cleaning residue coats the prism, the sensor may read incorrectly. This does not mean optical sensing is unsuitable, but it means the liquid must be tested under real cleaning and drying conditions.
Hygienic Mounting and Installation Design
A hygienic sensor installation should avoid trapped liquid, dead corners and difficult-to-clean edges. In small appliances, the priority may be compact side-wall mounting. In process tanks, the priority may be drainability, gasket compression and surface finish around the process connection.
Common mounting choices include threaded tank installation, compact side mounting, flange-style mounting or customized OEM housing. The best design depends on tank wall thickness, internal cleaning access, sensor orientation and whether the cable side needs wash-down protection.
For coffee machines, water dispensers and hot beverage equipment, the sensor must fit compact reservoirs while tolerating warm water, steam-adjacent areas and repeated filling. See our coffee machine sensor page for a more appliance-focused example.
Dairy, Beverage and Dosing Applications
Food and beverage manufacturers use optical point-level sensors where a compact, fast liquid/no-liquid signal is more useful than continuous level measurement.
Typical applications include:
- Low-level alarm in milk, water or beverage reservoirs
- Overflow protection in filling equipment
- Empty-tank detection before pump operation
- Dosing tank confirmation for flavor, syrup or additive systems
- Coffee machine and dispenser water level detection
- Cleaning-fluid tank monitoring in food equipment
- Small OEM tanks where floats are too large or unreliable
For dairy and beverage liquids, sample testing is important because foam, fat, protein, pulp, sugar and cleaning residue can affect optical detection. 投与システム用, chemical compatibility is usually the first concern. For coffee and hot-water equipment, 温度, scale and compact mounting are usually more important.
Hygiene Checklist Before RFQ
Use this checklist before requesting a sample:
- List every liquid touching the sensor, including cleaning chemicals.
- Confirm all wetted parts: ボディ, プリズム, 印章, gasket and thread.
- State whether food-contact documentation is required for the final product.
- Share cleaning cycle details: 湯, 洗剤, 酸, アルカリ, steam or rinse.
- Confirm whether the sensor must survive CIP, SIP or external wash-down.
- Check whether liquid can foam, coat, crystallize, ferment or leave solids.
- Define mounting position: 側壁, 底, ページのトップへ, パイプ, reservoir or tank.
- Confirm whether the sensing area must be drainable after cleaning.
- 出力タイプを選択する: NPN, PNP, digital switch or 4–20 mA.
- Request sample validation using the real liquid and cleaning process.
5-Step Application Support Process
- 調査
液体タイプを送ってください, 戦車図面, 洗浄方法, 温度曝露, mounting position and required output. - スペックとカスタマイズのレビュー
Our engineering team checks wetted material, 住宅, 印章, ケーブル, 糸, output and control-board compatibility. - サンプル確認
Samples can be prepared for validation with the real food, beverage, dosing liquid or cleaning cycle. - 生産と品質管理
After confirmation, the factory follows the agreed model, 配線, material and inspection requirements for OEM/ODM production. - 輸送および輸出支援
We support export projects for customers in the US, いた, インドおよびその他の市場, with packing and documentation aligned to the order requirements.
注文前に確認すべき要件
| 要件 | なぜ重要なのか |
|---|---|
| 濡れた物質 | Determines food-contact suitability, chemical resistance and long-term hygiene |
| Cleaning process | CIP/SIP, 湯, detergent or steam may change material choice |
| Liquid behavior | 泡, film, pulp, fat or crystals can affect optical sensing |
| Mounting design | Poor installation can create crevices, leakage or residue traps |
| 出力信号 | NPN, PNP, digital or 4–20 mA must match the controller |
| ケーブルとコネクター | Wash-down and OEM assembly conditions affect cable exit design |
| 文書 | Food-contact claims must be confirmed with model-specific evidence |
Optical vs Float vs Conductive Level Detection
| センサーの種類 | 最適フィット | Main advantage | Food/beverage concern |
|---|---|---|---|
| Optical point-level sensor | Compact tanks, 機器, 投与量, overflow/empty detection | 動くフロートはない, fast point-level signal, コンパクトな設計 | Prism must stay clean and material must be validated |
| フロートスイッチ | Simple tanks with enough space | Low-cost mechanical switching | 可動部品, sticking, cleaning difficulty |
| 導電性プローブ | 導電性液体 | Simple level detection | Not suitable for non-conductive liquids and may need exposed electrodes |
| 静電容量センサー | Some liquids through wall or probe designs | Can detect without moving parts | Requires tuning and may be affected by buildup |
Why Work with HojellyTek
HojellyTek combines photoelectric optical sensing, 社内R&D and OEM/ODM manufacturing for liquid level sensor projects. Instead of selling one fixed model for every food application, we help buyers review wetted materials, 取り付け, 出力, cable structure and sample testing requirements before volume production.
For smart appliance projects, Tuya or Smart Life integration can be discussed where the sensor is part of a connected water tank, dispenser or monitoring device.
FAQ
What makes a food grade optical liquid level sensor suitable for beverage equipment?
It should use appropriate wetted materials, a cleanable sensing structure and a mounting design that fits the cleaning process. Food-contact documentation must be confirmed for the exact material and model before certification claims are used.
Can optical sensors be used in milk or dairy tanks?
はい, they can be considered for dairy point-level detection, but milk fat, protein film, foam and cleaning residue should be tested. The prism must remain clean enough for stable dry/wet detection.
Is PTFE better than 316 stainless steel for food applications?
常にとは限りません. PTFE is useful for chemical resistance and low adhesion, ただし 316 stainless steel is stronger for industrial tanks and wash-down environments. The right choice depends on liquid, cleaning method and mounting design.
Can the sensor survive CIP or SIP cleaning?
It depends on the selected material, 印章, cable exit and cleaning cycle. CIP/SIP temperature, 蒸気曝露, chemicals and duration should be shared during RFQ so the correct configuration can be reviewed.
Will syrup, foam or crystallized liquid cause false readings?
It can. Optical sensors depend on the prism surface. Sticky syrup, 重いフォーム, dried sugar or crystallized residue may affect detection, so real-liquid testing is recommended before production approval.
What should I send to request a quote?
Send the liquid name, 戦車図面, 取り付け位置, wetted material preference, 洗浄プロセス, 温度曝露, 出力タイプ, ケーブル/コネクタの必要性, order quantity and any food-contact documentation requirements.
Request a Food and Beverage Sensor Quote
To specify a food-grade optical level sensing solution, send your application details by WhatsApp or email. 液体を分け合おう, タンク構造, 洗浄方法, 素材の好み, mounting drawing and required output, and our team will recommend a suitable sensor configuration for sample testing and OEM production.
