Flange-Mount Optical Liquid Level Sensor
HojellyTek manufactures flange-mounted optical liquid level sensors in Shenzhen for OEM/ODM projects, kaihanga taputapu, and sensor distributors needing custom mounting geometry, wetted materials, Ngā kōwhiringa tāputa, and export-ready support for US, MATOU, and India markets.
Flange-Mounted Sensor Capabilities
A flange-mounted optical level switch is normally selected when the tank wall cannot reliably hold a threaded sensor. Instead of cutting a threaded port, the tank uses a clearance hole and a flange face. The flange holds the sensor body against the outside or inside surface while a gasket or O-ring creates the seal.
For buyers comparing mounting types, our standard pūoko taumata ōmata range can be configured around tank material, sensing height, aronga putaatu taura, and electrical output. For projects that already have a metal boss or thick threaded port, he 1/4 NPT threaded option may be more suitable. For corrosive media, food equipment, oil systems, or stainless tanks, he 316 stainless body can be reviewed during material selection.
Typical customization areas include:
- Round, tapawha, or custom flange shapes
- Two-hole, three-hole, four-hole, or customer-defined bolt patterns
- Flat gasket or O-ring sealing design
- kirihou, PTFE, 316 tīra poapoa, or glass-contact material options
- NPN, PNP, KĀORE, NC, or analog output configuration where required
- Taura, tūhono, wire length, and exit direction
- Side-wall, raro, top-down, or equipment-panel mounting
Mounting Problem This Design Solves
The main reason to choose a flange-mounted optical liquid level sensor is not sensing theory; it is installation reliability. Many tanks are made from thin plastic, stainless sheet, waikori, konumohe, or molded housings where internal threads are weak, utu nui, or impossible to machine. If a threaded sensor is forced into a thin wall, the installer may face poor sealing, wall cracking, thread stripping, sensor tilt, or inconsistent sensing height.
A flange mount spreads the mechanical load across a wider surface. The tank hole provides clearance for the sensing tip, while the flange controls alignment and compression. This makes the design useful for thin-wall reservoirs, kura wai, coolant tanks, ipu hinu, battery equipment, cleaning equipment, taputapu nohinohi, and OEM modules where tapping is not practical.
The flange also gives the buyer better control over repeat assembly. In production, operators can drill or mold the same hole pattern, place the gasket, insert the sensor, tighten the screws or nut, and confirm the sensing point height. This is easier to standardize than hand-tapping a thin tank wall.
Flange Size and Pattern Selection
The flange must match three things: the tank wall, the sealing surface, and the sensing location. A small flange saves space, but it provides less gasket area. A larger flange gives better sealing support, but it needs more room on the tank wall. The correct choice depends on tank thickness, available flat area, wiriwiri, momo wai, and assembly method.
For compact tanks, a mini round flange may be enough if the wall is flat and the liquid pressure is low. For equipment panels or molded reservoirs, a two-hole or four-hole flange can prevent rotation during cable handling. For higher vibration or larger tanks, a wider flange face and stronger screw pattern usually gives better stability.
The flange drawing should define the sensor center hole, flange outside diameter, bolt hole quantity, bolt circle or spacing, screw size, gasket contact area, and cable exit clearance. If the tank already has a hole pattern, our team can review the drawing and adapt the flange design instead of forcing the buyer to redesign the tank.
Flange Dimension Table for RFQ Review
| Flange Item | What to Confirm | He aha te take |
|---|---|---|
| Flange shape | Round, tapawha, oval, or custom profile | Controls available sealing area and tank-wall fit |
| Center clearance hole | Hole for the sensing tip and sensor body | Prevents rubbing, tilt, or incorrect insertion depth |
| Flange outside size | Maximum space allowed on the tank wall | Ensures the flange does not hit ribs, corners, welds, or nearby parts |
| Bolt pattern | Two-hole, three-hole, four-hole, or custom spacing | Prevents rotation and controls gasket compression |
| Bolt hole size | Matched to screw or fastener choice | Avoids loose mounting or forced assembly |
| Gasket seat | Flat gasket face or O-ring groove | Determines sealing method and compression control |
| Sensor projection | Distance from flange face to sensing point | Sets the liquid level switching height |
| Cable exit direction | Torotika, side exit, or customer-defined | Avoids cable bending against the tank or enclosure |
| Wall thickness range | Confirmed from tank drawing or sample | Prevents poor clamping, insufficient engagement, or sensor misalignment |
| Takotoranga | Taha, raro, runga, or angled mount | Affects drainage, residue buildup, and service access |
Gasket and O-Ring Sealing Options
A flange mount is only reliable if the seal is matched to the tank surface and liquid. Flat gaskets are useful when the tank wall has a broad, smooth contact area. O-rings are often preferred when the flange has a controlled groove and the design requires repeatable compression.
Seal material should be chosen by the liquid, tikanga horoi, temperature range, me ngā rauemi kura. Silicone is often considered for water and general equipment sealing. FKM is commonly selected for oil, Kora, and higher chemical resistance requirements. EPDM may be reviewed for water-based systems. PTFE-related sealing solutions may be considered where chemical compatibility is more important than elastic compression.
The real failure modes are usually simple: the gasket is too hard, the wall is not flat, the screws are tightened unevenly, the O-ring groove is not controlled, or the sensor is mounted on a curved tank section without enough sealing area. For OEM work, the safest approach is to review the tank drawing, mata hiri, screw layout, and liquid compatibility before sample production.
Wall Thickness and Orientation Guidelines
For thin-wall tanks, the sensor should be mounted where the wall is flat and strong enough to hold compression. If the wall flexes when the screws are tightened, the seal may loosen over time. If the wall is too thick for the selected sensor projection, the sensing point may not sit at the required level inside the tank.
Side-wall mounting is common for high/low level detection because it sets a clear switching height. Bottom mounting can work for leak detection or minimum-level monitoring, but it requires stronger sealing review because liquid pressure and residue may affect the mounting area. Top-down mounting can be used when the tank wall does not allow side drilling, but the projection length and cable routing must be checked carefully.
Avoid placing the flange on curved corners, weld seams, ribbed plastic, uneven molded surfaces, or areas where tools cannot tighten the fasteners evenly. A flange-mounted sensor is a mechanical assembly first; the sensing performance depends heavily on stable installation.
5-Step OEM/ODM Process
- Uiui — Send the tank drawing, momo wai, mounting direction, target level height, and required output.
- Spec me te ritenga ake — We confirm flange shape, bolt pattern, gasket/O-ring design, wetted materials, taura, and electrical output.
- Tauira — A sample can be prepared for tank fitting, sealing check, and electrical validation.
- Production and QC — The factory checks assembly consistency, waea, output function, and appearance before shipment.
- Tukunga — Orders are packed for export, with communication by WhatsApp or email for project updates.
Requirements to Confirm Before Ordering
Before ordering a flange-mount optical liquid level sensor, confirm these details:
- Rauemi kura me te mātotoru o te pakitara
- Flat mounting surface size
- Required sensing height from the tank bottom
- Hole diameter or existing tank cutout
- Bolt pattern or available screw locations
- Momo wai: wai, hinu, waiwhakao, Kora, matū, wai horoi rānei
- Seal preference: flat gasket or O-ring
- Wetted body material: PSU, PTFE, 316 tīra poapoa, or glass contact design
- Momo huaputa: NPN, PNP, KĀO/NC, or analog requirement
- Supply voltage required by the control board
- Aronga whakatū: side-wall, raro, top-down, koki rānei
- Roanga taura, tūhono, and cable exit direction
- Need for OEM branding, drawing control, or custom packaging
For buyers who need a complete selectable product reference, Te hua pūoko taumata ōmata page can be used as a starting point before flange-specific customization.
Flange Mount vs Threaded Mount
| Selection Point | Flange Mount Sensor | Threaded Sensor |
|---|---|---|
| Best tank type | Thin-wall or non-threaded tank | Thick wall, boss, or threaded port |
| Installation method | Clearance hole plus flange seal | Threaded hole or threaded fitting |
| Sealing method | Gasket or O-ring under flange | Thread sealant, Mowhiti-O, or thread design |
| Rotation control | Bolt pattern can prevent twisting | Sensor may rotate during tightening |
| OEM repeatability | Good for molded or drilled patterns | Good when threaded inserts are controlled |
| Modification required | Hole and screw pattern | Threaded port or tapping process |
| Best use case | Plastic reservoirs, paewhiri, thin metal tanks | Machined metal tanks or pipe fittings |
He aha te take e mahi tahi ai me HojellyTek
Ko HojellyTek he kaiwhakanao pūoko taumata ōmata me te wai o Shenzhen me te R i roto i te whare&D and OEM/ODM support. Our team focuses on photoelectric optical sensing products, custom mounting structures, wetted-material selection, and export projects for equipment manufacturers and distributors.
For connected systems, Tuya/Smart Life integration can also be discussed where the project requires sensor data to work with smart monitoring hardware. For industrial and OEM buyers, we support drawing review, whakamanatanga tauira, and configuration discussions before production.
FQ
Can a flange mount optical liquid level sensor be installed without tapping internal threads?
Āe. A flange mount optical liquid level sensor is designed for tanks where tapping internal threads is difficult or unreliable. The tank normally uses a clearance hole, a flange face, and a gasket or O-ring seal.
What flange pattern should I choose?
Choose based on tank space, sealing area, and anti-rotation needs. Two-hole patterns suit compact designs, while three-hole or four-hole patterns give stronger alignment and more even gasket compression.
Should I use a gasket or an O-ring?
Use a flat gasket for broad flat surfaces and an O-ring when the flange can include a controlled groove. The seal material should match the liquid, pāmahana, tikanga horoi, me ngā rauemi kura.
Can the sensor be mounted on a curved tank wall?
It is not recommended unless the flange and gasket are designed for that surface. A flat mounting area gives better compression and lower leakage risk.
Can I use flange mounting for oil or coolant tanks?
Āe, but the wetted materials and seal material must be checked. For oil, waiwhakao, Kora, matū rānei, share the liquid details so the factory can review body material and gasket compatibility.
What information should I send for a quotation?
Send the tank drawing or photo, mātotoru o te pakitara, hole size, mounting orientation, sensing height, momo wai, whakaritenga huaputa, roanga taura, and expected order use. Our team can then recommend a suitable flange-mounted design.
Tonoa he Kīanga
Need a flange-mounted optical level sensor for a thin-wall or non-threaded tank? Contact HojellyTek by WhatsApp or email with your tank drawing, momo wai, mounting direction, me te whakaritenga huaputa. Our team will review the flange size, aratuka hiri, whiriwhiringa rauemi, and sample configuration for your project.
