1. Althensensors
  2. Sensors
  3. Tilt and inclinometers
  4. Geotechnical (electrolytic) inclinometers
  5. 500 Self-Leveling Borehole Tiltmeter (Lily)

500 Self-Leveling Borehole Tiltmeter (Lily)

High-pressure stainless steel housing, rated for submergence to depths of 3500 meters.


Key features

  • Resolution up to 5 nanoradians
  • ±330 µradians dynamic range
  • ±10° leveling range for easy downhole installation
  • RS-232 or RS-422 output options
  • Save data externally or to 75,000 sample on-board flash memory
  • Fully submersible to 3000 psi (Titanium available for +5000 psi)

500 Self-Leveling Borehole Tiltmeter (Lily)

The Self-Leveling Borehole Tiltmeter is designed for volcanic and tectonic research, ocean bottom applications, and for monitoring of hydraulic fracturing and other subsurface processes in the mining and petroleum industries.

The tilt meter's high-pressure stainless steel housing is rated for submergence to depths of 3500 meters. You can attain even greater depths by switching to a titanium housing.

The tilt sensors can self-level on command through a range of ±10 degrees and have 5 nanoradians resolution over a dynamic range of ±330 microradians. The self-leveling feature keeps this tilt meter on scale indefinitely at the high gains required for geophysical work.

Its versatile RS232 and RS422 serial outputs, and its powerful firmware command set, give you a wide range of measurement and recording options. Data can be stored internally for periodic downloading, or streamed to your external network or recorder. GPS compatible output formats are included.

Suitable applications

  • Volcanic and tectonic research
  • Hydraulic fracture mapping
  • Micro-deformation monitoring
  • Deep ocean geophysics


RoHS certified version upon request (extended delivery time).

Do you need this sensor for your next project?

Request a quotation today or leave your details to recieve more information from one of our experts.

Talk to an expert

Have it your way

Not exactly what you’re looking for? We offer standard sensors but can also help you with a tailor-made sensor or a complete measuring solution. Please contact us for advice or budgetary pricing.

Talk to an expert

Technical Specifications

Specification Value
Dimensions 51 mm dia. x 915 mm
Housing Stainless steel, rated to 345 bars (5,000 psi)
Output RS232, RS422, or both; full duplex
Power requirement 7-28 VDC @ 30mA (<10 mA in sleep mode)
Range (biaxial) ±10° adjustment range, ±330 µradian dynamic
Resolution 5 nanoradians
Temperature range -20 to +85°C