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Jewell Model 820 Shallow Water Tiltmeter Series

Updated:2026-02-04

Brand: Jewell
Model: Model 820
Description: 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 m
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Product Details

Jewell Model 820 Shallow Water Tiltmeter Series Description：

A820 Datasheet C820 Datasheet D820 Datasheet

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.

Specifications

A820: ±5V Output

	High Gain	Standard	Wide Angle
Angular Range (°)	±0.5	±3.0	±50
Resolution (°)	<0.0001	0.0001	0.002
Repeatability (°)	0.0003	0.0003	0.004
Non-linearity (%)	0.1	0.1	0.1
Time Constant	0.15 sec
Kz Temperature Coefficient (°/C)	±0.0002		±0.002
Ks Temperature Coefficient (%/°C)	0.04		<0.1
Baud Rate	9600 (default), 19200, 28800, 57600, 115200, 130400
Output	RS-232, RS-422
Output Format	NMEA XDR, Trimble TCM, Ashtec compatible, Simple (default: X, Y, Temp., S/N)
Channels	Tilt, Temperature, S/N
Temperature Output	0.1°C/mV typical (single ended; 0°C = 0mV)
Power	7-28 VDC @ 30mA, 250 mV ripple max, reverse polarity protected
Environmental	-4 to +60° C operation; -30 to +100° C storage. 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	6-conductor unshielded, 20AWG female receptacle with locking sleeve, neoprene jacket, 24”

C820: 4-20mA Output

	High Gain	Standard	Wide Angle
Angular Range (°)	±0.5	±3.0	±50
Resolution (°)	<0.0001	0.0006	0.01
Repeatability (°)	<0.0002	0.001	0.02
Non-linearity (%)	1	2	? span: 1 Full span: 2
Scale Factor (°/mA)	0.0625	0.375	6.25
Time Constant	0.15 sec
Kz Temperature Coefficient (°/C)	±0.0002		±0.002
Ks Temperature Coefficient (%/°C)	<0.04		<0.1
Output	4-20mA Two-wire current loop (per axis)
Channels	Tilt, Temperature
Output Impedance (Ω)	270
Temperature Output	Temperature is measured with a 2500 Ohm thermistor, -50 to 150°C range
Power	(0.02 Ampere x R + 10 VDC) < Vs < 29 VDC
Environmental	-4 to +60° C operation; -30 to +100° C storage. 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	6-conductor unshielded, 20AWG female receptacle with locking sleeve, neoprene jacket, 24”

D820: Digital Output

	High Gain	Standard	Wide Angle
Angular Range (°)	±0.5	±3.0	±50
Resolution (°)	<0.0001	0.0001	0.002
Repeatability (°)	0.0003	0.0003	0.004
Non-linearity (%)	0.1	0.1	0.1
Time Constant	0.15 sec
Kz Temperature Coefficient (°/C)	±0.0002		±0.002
Ks Temperature Coefficient (%/°C)	0.04		<0.1
Baud Rate	9600 (default), 19200, 28800, 57600, 115200, 130400
Output	RS-232, RS-422
Output Format	NMEA XDR, Trimble TCM, Ashtec compatible, Simple (default: X, Y, Temp., S/N)
Channels	Tilt, Temperature, S/N
Temperature Output	0.1°C/mV typical (single ended; 0°C = 0mV)
Power	7-28 VDC @ 30mA, 250 mV ripple max, reverse polarity protected
Environmental	-4 to +60° C operation; -30 to +100° C storage. 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	6-conductor unshielded, 20AWG female receptacle with locking sleeve, neoprene jacket, 24”