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Product

12/24/48-channel geophone seismic spread cable12 / 24 / 48 Twisted PairsNK-27 / 61-Pin BayonetMueller / KCK / Kooter

Shallow Refraction Seismic Spread Assembly12, 24 & 48-channel polyaramid-reinforced seismic refraction & MASW takeout cable

Multi-channel shallow seismic refraction and MASW geophone spread cable with 12, 24 or 48 twisted pairs, moulded Mueller, KCK split-spring or waterproof Kooter takeouts at 1–10 m pitch, and NK-27 / 61-pin bayonet plugs.

Water-resistant
Outdoor & humid
Ozone, UV & moisture
EMC screen
Order designation
SRS-24C-5M-KCK-61P
Takeout pitch
5 m
Total length
130 m
Cable OD
9.6 mm
Total weight
14.5 kg
All sizes (12)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Channel count
12, 24 or 48
Twisted pairs (12P, 24P, 48P + aux)
Takeout pitch
1 m to 10 m
Standard 2 m, 3 m, 5 m & 10 m intervals
Takeout style
Mueller / KCK
Split-spring KCK, Mueller clip or Kooter
End plug
NK-27 / 61-Pin
Cannon NK-27-21C or 61-pin KPT bayonet
Break load
2.0–3.5 kN
High-modulus polyaramid tensile core
Cross-talk
≥ 80 dB @100Hz
Staggered-lay low-capacitance pairs

Typical values for this cable type, based on ASTM D5777 / MIL-DTL-26482 / MIL-DTL-55116 — confirmed in the datasheet and quotation for your order.

Application fit

Is Shallow Refraction Seismic Spread Assembly right for your machine?

Engineered for 12-, 24- and 48-channel shallow refraction, reflection and MASW engineering seismographs.

Trailing & towing

Suitable

Copper-clad steel / tinned copper conductors and central 3.0 kN polyaramid member survive rough field dragging.

Immersion & wet locations

Suitable

Polyurethane-moulded waterproof takeouts (IP67/IP68 with Kooter / Wokcki connectors) operate in wet ditches and marshland.

Motorised monospiral reel

Suitable

Arctic-grade −40 °C to +80 °C cold-flexible polyether PUR jacket prevents kinking and memory coils on portable reels.

Energy chain / drag chain

Not suitable

Geophysical field seismic spread cable is designed for land surveys, not factory machine drag chains.

Use M12 Sensor Cordset
Typical machinesShallow Seismic Refraction (Bedrock Depth)MASW & ReMi Shear-Wave Velocity ProfilingGeotechnical Foundation & Tunnel InvestigationLandslide & Dam Abatement Seismic SurveysUXO & Archaeological Shallow Reflection

Construction

Layer by layer

Representative 24-channel seismic spread cable: 24 × twisted pairs (24 AWG tinned copper + copper-clad steel hybrid strands, PP insulated) + central polyaramid strength member + overall foil/tape wrap + arctic PUR jacket + moulded takeouts.

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Hybrid tinned-copper / copper-clad-steel (CCS) conductors12, 24 or 48 twisted pairs of 0.22–0.32 mm² (24–22 AWG) hybrid stranding (e.g. 12×tinned copper + 7×high-tensile copper-clad steel strands)Combines low DC loop resistance (≤ 72 Ω/km) with high flex fatigue and tensile resilience
2Low-capacitance PP / PE pair insulationThin-wall polypropylene (PP) or HDPE insulation with staggered pair twist pitchesAchieves ≥ 80 dB channel-to-channel crosstalk isolation across the 4 Hz to 500 Hz seismic passband
3Central polyaramid strength memberContinuous 2.0 kN to 3.5 kN high-modulus polyaramid core anchored to both end connector backshellsAbsorbs field pulling tension during line deployment and recovery
4Optional electrostatic Al/PET shieldOverall aluminised polyester tape with tinned copper drain wire (optional on high-EMI urban MASW spreads)Rejects 50/60 Hz overhead powerline hum during urban geotechnical surveys
5Arctic-flexible polyether PUR outer sheathExtruded matte yellow, orange or blue polyether polyurethane (PUR) jacket with hot-melt moulded takeout bootsRemains limp and tangle-free at −40 °C while resisting sharp gravel and brush

SRS-24C-KCK / MUELLER (Land Refraction & MASW)

24 twisted pairs with moulded dual Mueller clips or KCK (2-pin split-spring) female takeouts and 61-pin Bendix / NK-27 connectors

SRS-24C-KOOTER (Waterproof Marsh / Roll-Along)

24 or 48 twisted pairs with IP68 waterproof Kooter / Wokcki polarized geophone takeouts for wet-terrain refraction & reflection

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on ASTM D5777 / MIL-DTL-26482 / MIL-DTL-55116. Values for your order are confirmed in the datasheet and quotation.

Electrical

Channel capacity
12, 24 or 48 differential geophone pairs (+ optional trigger pair)
Conductor loop resistance
≤ 140 Ω/km per pair (≤ 70 Ω/km single conductor)
Insulation resistance
≥ 5,000 MΩ·km at 500 V DC
Mutual capacitance
≤ 55 pF/m within twisted pair
Crosstalk attenuation
≥ 80 dB at 10–500 Hz

Thermal

Field operating temperature
−40 °C to +80 °C
Cold-bend flexibility
IEC 60811-504 at −40 °C

Mechanical

Standard takeout intervals
1 m, 2 m, 3 m, 5 m, 10 m (plus 5–10 m lead-in tails)
Geophone takeout interfaces
Dual Mueller clips, KCK (split-spring), Kooter or Wokcki
Seismograph connectors
61-pin MIL-DTL-26482 bayonet, NK-27-21C (27-pin), or 32-pin
Tensile breaking load
2.0 kN (12/24-ch) · 3.5 kN (48-ch / heavy-duty)
Min. bend radius
6 × OD

Resistance

Moisture & mud sealing
IP67 (KCK) / IP68 (Kooter moulded takeouts)
Abrasion resistance
DIN ISO 4649 ≤ 35 mm³ polyether PUR

Reference standards

Seismic refraction method
ASTM D5777
End connector standard
MIL-DTL-26482 Series 1 (PT06/KPT06 24-61S/P) / NK-27

Identification

Outer jacket colour
Yellow, Orange or Blue (colour-coded by takeout spacing)
Takeout numbering
Moulded / laser-marked Channel #1 to #24/#48 at every node
Customs tariff (HS)
8544.42 / 9015.80

Sizes

12 standard 12, 24 & 48-channel shallow seismic spread cable configurations

Compatible with 61-pin MIL-DTL-26482 bayonet, 27-pin NK-27-21C, and 32-pin engineering seismograph interfaces.

Channels, takeout pitch, connectors & weight
Order designationChannels & Takeout TypePitch
m		Total Len
m		End ConnectorsCable OD
mm		Total Wt
kg		Break Load
kN		Enquiry
12 & 24-Channel Geophone Spread Cables (NK-27-21C & 61-Pin Bayonet Standard)
SRS-12C-3M-KCK-NK2712-Ch KCK Split-Spring3 m452 × NK-27-21C7.64.22.0
SRS-12C-5M-KCK-NK2712-Ch KCK Split-Spring5 m702 × NK-27-21C7.66.12.0
SRS-24C-2M-KCK-61P24-Ch KCK Split-Spring2 m5661-Pin Bayonet Female9.46.82.5
SRS-24C-3M-KCK-61P24-Ch KCK Split-Spring3 m8061-Pin Bayonet Female9.49.22.5
SRS-24C-5M-KCK-61P24-Ch KCK Split-Spring5 m13061-Pin Bayonet Female9.614.52.5
SRS-24C-5M-MUELLER-61P24-Ch Dual Mueller Clips5 m13061-Pin Bayonet Female9.615.12.5
SRS-24C-10M-KCK-61P24-Ch KCK Split-Spring10 m25061-Pin Bayonet Female9.826.83.0
Waterproof Kooter & 48-Channel Roll-Along Seismic Spread Cables
SRS-24C-2M-KOOTER-61P24-Ch Waterproof Kooter2 m562 × 61-Pin (M/F Roll)9.67.42.5
SRS-24C-5M-KOOTER-61P24-Ch Waterproof Kooter5 m1302 × 61-Pin (M/F Roll)9.815.63.0
SRS-24C-10M-KOOTER-61P24-Ch Waterproof Kooter10 m2502 × 61-Pin (M/F Roll)10.028.43.0
SRS-48C-2M-KOOTER-2X61P48-Ch Waterproof Kooter2 m10661-Pin Roll-Along12.218.93.5
SRS-48C-5M-KOOTER-2X61P48-Ch Waterproof Kooter5 m25561-Pin Roll-Along12.542.53.5
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Double-ended cables with 61-pin Male/Female or reversible pinouts support continuous roll-along reflection and MASW surveying.

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 % channel polarity, continuity & crosstalk testVerify pin-to-takeout polarity (+ / −), loop resistance ≤ 140 Ω/km and ≥ 80 dB crosstalk isolationEvery spread cable
500 V DC water-bath leakage resistance testVerify ≥ 5,000 MΩ·km core-to-core and core-to-shield/water insulation resistanceEvery spread cable
Sample tests
Cold-flex & polyaramid anchor pull test2.0 kN axial load test and −40 °C mandrel wind testProduction lot

Inspection certificate

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

Product approvals

ASTM D5777 Seismic Refraction Survey CompliantMIL-DTL-26482 61-Pin Bayonet & NK-27 Compatible

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX SEISMIC SPREAD CABLE 12/24/48CH POLYARAMID PUR [METRE]
Delivery form
Supplied on portable chest/backpack breast reel with connector caps
Matching geophones
Optional 4.5 Hz, 10 Hz, 14 Hz, 28 Hz & 40 Hz vertical/horizontal geophone strings
Hammer switch
Optional 100 m / 200 m sledgehammer piezo trigger starter cable on reel
Lead time
2–3 weeks ex-works

Technical documents

Downloads

PDFShallow Refraction Seismic Spread Assembly – technical datasheet12 sizes · construction, technical data, approvalsXLSXShallow Refraction Seismic Spread Assembly spec data (Excel)All 12 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 are hybrid tinned-copper / copper-clad-steel (CCS) strands used in seismic spread cables?
Pure soft copper conductors eventually work-harden and snap after hundreds of cycles of being pulled across ground and wound onto small portable breast reels. Combining 12 tinned-copper strands with 7 high-tensile copper-clad-steel strands raises conductor flex life 5× while keeping loop resistance low.
What is the difference between Mueller clip, KCK split-spring, and Kooter takeouts?
Mueller clips are traditional alligator-style jaws that clip onto dual brass lugs. KCK (2-pin split-spring) takeouts mate rapidly with twin-post geophone connectors and shed mud easily. Kooter (and Wokcki) takeouts are polarized O-ring-sealed waterproof plugs used in wet ditches, marshes, and roll-along surveys.
Is the 61-pin connector wired for standard 61-pin bayonet and 27-pin NK-27 seismograph pinouts?
Our standard 24-channel 61-pin connector follows the industry-standard 61-pin MIL-DTL-26482 (PT06A-24-61S/P) pin assignment, and our 12-channel cables follow the standard 27-pin NK-27-21C pinout. Custom multi-channel seismograph pinouts are wired on request.
Can you build centre-connector or roll-along seismic spread cables?
Yes. We build single-ended spreads (connector at one end), double-ended roll-along spreads (Male at one end, Female at the other), and centre-tap spreads where the 61-pin seismograph takeout sits between Channel 12 and Channel 13.

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