Model 820 Shallow Water Tiltmeter Series

The model 820 Shallow Water is a high-precision submersible tiltmeter for use in fresh and saltwater applications. Using an absolute gravity-referenced electrolytic sensor, the 820 delivers superior measurement accuracy with virtually no long-term drift.

High-gain units are sensitive to <0.0017 mm/m or better. Output options include analog (±5 VDC, ±10 VDC), current (4-20mA), and digital (RS-232 and RS-422).

All units are rated to 200 meters (656.2 ft) waterproof for advanced protection from the elements. Use the 820 “Shallow Water” for structural monitoring, angle measurement and control, platform leveling, and more.

Weight	1.59 kilograms
Dimensions	91.44 x 111.76 x 60.96 mm
Angular Range	±0.5, ±3.0, ±50
Resolution	<0.0001, 0.0001, 0.002°
Repeatability	0.0003, 0.004
Non-linearity (%)	0.1
Time Constant (seconds)	0.15
Kz Coefficient (°/C, typical)	±0.0002
Ks Coefficient (%/C, typical)	<0.1, 0.04
Baud Rate	115200, 130400, 19200, 28800, 57600, 9600 (default)
Output Voltage (V)	RS-232, RS-422
Output Format	Ashtec compatible, NMEA XDR, Simple (default: X, Y, Temperature, S/N), Trimble TCM
Channels	S/N, Temperature, Tilt
Temperature Output	0.1°C/mV typical (single ended; 0°C = 0mV)
Power	250mV ripple max, 7-28 VDC @ 30mA, Reverse polarity protected
Environmental	-30 to +100° C storage, -4 to +60° C operation, Submersible to 200 meters (656.2 ft)
Materials	316SS
Mounting	Two no. 10 stainless steel mounting screws
Housing Connector	6-pin bulkhead, Male plug
Cable	20AWG female receptacle with locking sleeve, 24", 6-conductor unshielded, Neoprene jacket

Model 820 Shallow Water Tiltmeter Series

Model 820 Shallow Water Tiltmeter Series

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Model 802 Deep Water Submersible Tiltmeter Series