The GEOKON GK-604D-150M Digital Inclinometer System (Model Code: GK-604D-150M) is a world-class geotechnical instrumentation package manufactured by GEOKON (USA) with 100% USA Origin. Utilizing high-resolution Micro-Electro-Mechanical Systems (MEMS) accelerometers and wireless Bluetooth communication, this system is engineered to measure lateral ground movement, subsurface deflection, and structural inclination along the depth profile of standard grooved Inclinometer casings.

COMPLETE SYSTEM COMPONENTS:
1. Model 6100D Biaxial Digital Inclinometer Probe:
Houses two orthogonal MEMS tilt sensors (A and B axes) and an internal 24-bit A/D converter. The analog acceleration voltages are digitized directly inside the probe before transmission to the surface, completely eliminating transmission line noise and cable length attenuation.
2. Model 6001D-2 Lightweight 150m Control Cable:
Constructed with a central non-stretch stainless steel aircraft wire member encased in a double pressure-extruded polyurethane jacket with reinforced internal braiding. Depth markers are permanently swaged with brass increments at exact 0.5 m intervals for absolute depth indexing.
3. Bluetooth-Enabled Cable Reel & Interface:
The rugged cable reel houses the internal Interface module, transmitting measurement data wirelessly via Bluetooth® to the handheld Field PC. Equipped with a high-capacity internal rechargeable Lithium battery delivering over 40 hours of continuous field operation per charge.
4. Rugged Industrial Field PC Readout:
Handheld field computer featuring a high-visibility sunlight-readable display, loaded with the dedicated GEOKON GK-604D Reader software for automated data logging, real-time checksum validation, immediate deflection profile plotting, and seamless export compatibility with SiteMaster / SiteMaster Plus data reduction software.
5. Model 6000-22 Cable Pulley Assembly:
Mounts securely onto the top collar of the inclinometer casing, holding and seating the cable markers at precise 0.5 m depths while protecting the cable jacket from abrasive friction against the casing lip.
6. Heavy-Duty Transportation Case & Accessories:
Includes heavy-duty protective carrying cases for the probe, cable reel, and field PC for rugged transport across active construction job sites.

KEY PRODUCT FEATURES AND OPERATIONAL ADVANTAGES:
• Outstanding System Accuracy: Delivers a system resolution of ±0.025 mm / 500 mm (±10 arc seconds within ±5° from vertical) and a repeatability of ±1 mm over a 30 m depth.
• True Wireless Field Convenience: Eliminates clumsy connecting cables between the reel and handheld reader, allowing the engineer to move freely and safely around borehole collars.
• Live Checksum & Error Verification: Automatically validates opposing survey passes (0° and 180° orientations) on-site, flagging deviations immediately for instant survey repeats.

TYPICAL GEOTECHNICAL APPLICATIONS:
• Deep Urban Excavations: Monitoring lateral displacement of slurry diaphragm walls, sheet piles, contiguous bored piles, and adjacent soil stabilization zones.
• Embankments, Dams & Landslide Slopes: Early warning of slope instability on highways, open-pit mines, railway cuts, and earth/rockfill dams.
• Tunnels & Underground Caverns: Measuring ground settlement, crown deformation, and sidewall convergence during TBM or NATM tunneling.
• Offshore Structures & Deep Foundations: Evaluating lateral pile bending deflection and abutment displacement under heavy dynamic loads.

• Manufacturer: GEOKON
• System Designation: Digital Inclinometer System
• Model Code: GK-604D-150M
• Brand Origin: USA (100% USA Origin)
• Control Cable Length: 150 meters (150 m)
• DETAILED SUBSYSTEM SPECIFICATIONS:

1. DIGITAL INCLINOMETER PROBE (MODEL 6100D):
• Calibrated Range: ±30° (Operating Range: ±90°)
• Sensors: Two orthogonal MEMS accelerometers (A-axis and B-axis)
• Probe Resolution: 24-bit A/D Converter
• System Resolution: ±0.025 mm / 500 mm (±10 arc seconds in ±5° vertical range)
• Accuracy: ±0.05% Full Scale (F.S.)
• Linearity: ±0.02% F.S. (up to ±10°)
• Repeatability: ±1 mm / 30 m
• Total System Accuracy: ±3 mm / 30 m (±0.125" / 100 ft)
• Wheel Base: 0.5 m (or optional 1 m / 2 ft)
• Wheel Diameter: Ø 30 mm
• Probe Dimensions: Diameter Ø 25 mm x Length 700 mm (Cable connector adds 150 mm)
• Compatible Casing Inside Diameter: 48 mm to 89 mm (1.9" to 3.5")
• Shock Survival: 2,000 g
• Temperature Coefficient: 0.002% F.S. / °C
• Ingress Protection: Submersible IP68 (Rated up to 2 MPa water head)
• Probe Operating Temperature: -30 °C ... +85 °C
• Probe Weight (with case): 7.5 kg

2. HEAVY-DUTY CONTROL CABLE (MODEL 6001D-2):
• Length: 150 m
• Outer Diameter: < 8 mm
• Jacket Construction: Double pressure-extruded Polyurethane (PU) jacket with internal braid
• Tensile Member: Central stainless steel aircraft wire member
• Minimum Breaking Strength: 500 lbs (approx. 225 kg)
• Depth Markers: Solid brass depth markers permanently swaged at exact 0.5 m intervals

3. CABLE REEL & WIRELESS INTERFACE:
• Wireless Communication: Bluetooth® Wireless Technology (Operational range up to 20 m)
• Power Source: Built-in rechargeable Lithium-Ion battery (7.4 V, 2600 mAh)
• Battery Runtime: > 40 hours continuous operation per full charge
• Interface Operating Temperature: -30 °C ... +50 °C

4. FIELD PC & SOFTWARE:
• Handheld Terminal: Industrial rugged Field PC
• Operating System & Software: Android / Windows running GEOKON GK-604D Reader Application
• Software Functions: Automated survey logging, checksum error validation, profile plotting, and direct data export
• Data Reduction Software Compatibility: SiteMaster / SiteMaster Plus

5. PULLEY ASSEMBLY & ACCESSORIES:
• Pulley Model: Model 6000-22 Cable Pulley Assembly
• Compatible Casing Diameters: Standard Inclinometer casings (48 ... 89 mm)
• Standard Package Includes: Battery charger, rugged carrying cases, user manual, and factory calibration certificates