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Product

instrumentation cable seriesCentral Barometric Vent TubePara-Aramid Suspension300 m Submersible PUR

Vented Level-Sensor CableSubmersible PUR hydrostatic level sensor cable with atmospheric reference vent tube

Vented Level-Sensor Cable engineered with a central crush-resistant PA12/PE atmospheric pressure reference capillary tube, 2 to 6 tinned copper power/4–20 mA/RS-485 conductors, para-aramid tensile strength yarns (≥ 500–1,000 N),.

300 m Continuous Submersion
Para-Aramid Tensile Core
Tinned Cu Braid EMC
Hydrolysis & Wastewater PUR
Order designation
VLC-PUR 4×0.34 + Vent
Outer Ø
7.5 mm
Vent tube ID
1.2 mm
Weight ≈
72 kg/km
Tensile strength
1,000 N
All sizes (4)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Central vent tube
1.0–1.5 mm ID
PA12 / PE kink-proof capillary
Conductors
2C to 6C + Scree
0.25 / 0.34 / 0.50 mm² tinned Cu
Tensile rating
500 to 1,200 N
Integrated para-aramid yarn
Submersion depth
Up to 300 m H₂O
30 bar hydrostatic pressure
Outer jacket
Polyether-PUR
Microbe & sewage resistant
Operating temp.
-30 to +85 °C
FEP / TPE-E core insulation

Typical values for this cable type, based on EN 50288-7 / IEC 60794 / KTW-BWGL / ACS — confirmed in the datasheet and quotation for your order.

Application fit

Is Vented Level-Sensor Cable right for your machine?

Simultaneously suspends submersible hydrostatic pressure/level transmitters (4–20 mA, HART, SDI-12, RS-485 Modbus), shields the electrical signal, and vents the back of the sensor diaphragm to surface barometric pressure.

Immersion & wet locations

Suitable

Hydrolysis- and microbe-resistant polyether-PUR outer sheath withstands continuous 300 m immersion in groundwater, seawater and sewage.

Free-hanging vertical run

Suitable

High-modulus para-aramid yarn carries the weight of the stainless/titanium level probe over 200–300 m vertical boreholes without.

Switchgear & control cabinet wiring

Suitable

Terminates at wellhead junction boxes fitted with desiccant breather filters or Gore-Tex vent membranes.

Energy chain / drag chain

Not suitable

Vertical hanging submersible sensor cable; not for high-speed horizontal machinery drag chains.

Use PUR-HF Drag-Chain Cable
Typical machinesDeep Borehole & Groundwater Aquifer MonitoringMunicipal Wastewater Lift Stations & DigestersPotable Water Reservoirs & Dam PiezometersMarine Ballast, Draft & Bilge Tank GaugingLeachate Wells, Tailings Dams & Chemical Tanks

Construction

Layer by layer

Vented Level-Sensor Cable showing central thick-wall PA12/PE atmospheric vent capillary tube, helically stranded tinned copper conductors with TPE-E/FEP insulation, para-aramid tensile suspension yarns, tinned copper braid screen + drain wire, and submersible polyether-PUR outer sheath.

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Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Tinned copper conductors + central PA12/PE vent tube2 to 6 × Class 5 flexible tinned copper conductors (0.25, 0.34 or 0.50 mm²) helically laid around a central 1.0–1.5 mm ID × 2.3–2.6 mm OD Polyamide 12 (PA12) or HDPE capillary tubeSymmetrical lay prevents vent-tube kinking under 10 × OD bends
2Hydrolysis-proof TPE-E / FEP primary core insulationHigh-insulation-resistance Hytrel (TPE-E), PP or FEP fluoropolymer core insulationPrevents capacitance drift or 4–20 mA shunt leakage
3Para-aramid tensile yarns & non-hygroscopic beddingHigh-modulus para-aramid roving spun around the core assembly + water-blocking polyester tapeProvides 500 N to 1,200 N suspension strength with < 0.3 % elongation
4Tinned copper EMC braid screen + drain wire≥ 85 % optical coverage tinned copper wire braid + stranded tinned copper drain wireDischarges lightning/surge transients in deep outdoor boreholes
5Submersible Polyether-PUR (or FEP /potable-water PE) jacketPressure-extruded Matte Black or Blue hydrolysis-, microbe- and oil-resistant Polyether Polyurethane (optional FEP or potable-water PE)Smooth circular profile seals cleanly in IP68/30-bar sensor cable glands

VLC-PUR-2C050 (2 × 0.50 mm² + Vent + Aramid)

2-wire 4–20 mA loop-powered submersible level transmitter cable (7.2 mm OD)

VLC-PUR-4C034 (4 × 0.34 mm² + Vent + Aramid)

4-core submersible level + Pt100 / RS-485 Modbus / SDI-12 transmitter cable (7.5 mm OD)

VLC-FEP-6C025 (6 × 0.25 mm² + Vent · FEP Jacket)

All-fluoropolymer FEP outer jacketed vented level cable for aggressive chemical/leachate wells

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on EN 50288-7 / IEC 60794 / KTW-BWGL / ACS. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage
300 V rms (4–20 mA / HART / RS-485 / SDI-12)
Max. DC resistance @ 20 °C
79.0 Ω/km (0.25) · 57.0 Ω/km (0.34) · 39.0 Ω/km (0.50 mm²)
Insulation resistance
≥ 1,000 MΩ·km @ 500 V DC
Test voltage
1,500 V AC rms (core-to-core & core-to-screen)

Thermal

Operating temp. (PUR / PE)
-30 °C to +85 °C (fixed submerged)
Operating temp. (FEP chemical)
-40 °C to +105 °C
Ice-formation resistance
Thick-wall PA12 tube resists surface frost pinch

Mechanical

Vent capillary dimensions
1.2 mm ID × 2.4 mm OD (or 1.5 × 2.6 mm) PA12/PE tube
Max. tensile suspension load
500 N working / 1,200 N breaking (para-aramid core)
Min. bend radius
10 × OD without restricting airflow through vent tube

Resistance

Hydrostatic water depth
Up to 300 m water column (3.0 MPa / 30 bar) without tube collapse
Microbial & sewage resist.
Polyether-PUR immune to bacterial hydrolysis, H₂S & grease
Drinking water option
Available with KTW-BWGL / WRAS / ACS / NSF-61 PE jacket

Reference standards

Instrumentation construction
EN 50288-7 & IEC 60228 Class 5 tinned copper
Halogen-free & RoHS
IEC 60754-1 (PUR/PE) · 2011/65/EU RoHS 2 & REACH
Oil resistance
EN 60811-404 / DIN VDE 0282-10

Identification

Sheath colour
Black or Blue (Potable Water) with smooth gland-sealing surface
Customs tariff (HS)
8544.4993
Core colour code
DIN 47100 (White, Brown, Green, Yellow, Grey, Pink)

Sizes

4 standard Vented Level-Sensor Cable configurations

Conductor count, vent-tube inner diameter, outer diameter, weight and para-aramid breaking load.

Dimensions, vent ID & tensile ratings
Order designationCores, vent tube & jacketOuter Ø
mm		Vent ID
mm		Weight ≈
kg/km		Tensile max
N		Enquiry
Submersible Vented Capillary Hydrostatic Level Transmitter Cables
VLC-PUR 2×0.50 + Vent2×0.50 mm² + 1.2 mm PA12 Vent · PUR7.21.2641,000
VLC-PUR 4×0.34 + Vent4×0.34 mm² + 1.2 mm PA12 Vent · PUR7.51.2721,000
VLC-PUR 6×0.25 + Vent6×0.25 mm² + 1.2 mm PA12 Vent · PUR7.81.2781,200
VLC-FEP 4×0.34 + Vent4×0.34 mm² + 1.2 mm PTFE Vent · FEP7.41.2921,000
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Outer diameter tolerance is held to ±0.15 mm for leak-tight compression in submersible transmitter Viton/EPDM seals.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
100 % pneumatic vent-tube airflow & 3.0 bar pressure decay testUnrestricted barometric airflow and zero capillary pinholes over full reelEvery manufactured reel
100 % 1.5 kV AC dielectric, IR & laser diameter concentricity checkZero breakdown, IR ≥ 1,000 MΩ·km and OD circularity ≤ 0.15 mmEvery manufactured reel
Sample tests
30 bar (300 m H₂O) hydrostatic crush & cable-clamp bend test< 5 % airflow reduction under 30 bar external water pressure & 10 × OD clampType qualification

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

EN 50288-7 CompliantKTW / WRAS / NSF-61 OptionRoHS 2 & REACH

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX SUBMERSIBLE VENTED LEVEL CABLE PUR + ARAMID
Delivery form
Fumigated wooden drums, steel reels or precision spools
Standard lengths
500 m · 1000 m (or custom cut/spooled lengths)
MOQ
100 m (standard) · 500 m (custom)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFVented Level-Sensor Cable – technical datasheet4 sizes · construction, technical data, approvalsXLSXVented Level-Sensor Cable spec data (Excel)All 4 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

Why do submersible hydrostatic level transmitters need an internal capillary vent tube?
Hydrostatic level sensors measure water depth by sensing total pressure at the bottom of the tank or borehole (P_total = P_water + P_barometric). Because atmospheric weather fronts can change barometric pressure by ±30–50 mbar—equivalent to ±30–50 cm of water error!—the central capillary tube vents the back of the piezo-resistive or ceramic sensor diaphragm directly to surface atmospheric pressure for automatic real-time barometric compensation.
What prevents the central vent tube from collapsing under 300 m of water pressure or a suspension clamp?
The capillary is extruded from thick-wall high-modulus Polyamide 12 (PA12) or PTFE (1.2 mm ID × 2.4 mm OD) and positioned at the neutral axis of the cable surrounded by a self-supporting arch of insulated conductors and para-aramid yarns.
How do you prevent humid surface air from condensing inside the vent tube?
At the surface junction box, the open end of the vent tube is terminated into either a refillable silica-gel desiccant cartridge or a hydrophobic ePTFE (Gore-Tex style) breather membrane that passes air while blocking liquid water and water vapor.
When should we specify the FEP-jacketed version (VLC-FEP) instead of Polyether-PUR?
Polyether-PUR is ideal for groundwater, rivers, seawater and municipal sewage. For landfill leachate wells, hydrocarbon-contaminated aquifers, strong acids or chlorinated chemical tanks, specify VLC-FEP with a 100 % fluoropolymer outer sheath.

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Vented Level-Sensor Cable

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