A Set-Up of 7 Laser Triangulation Sensors and a Draw-Wire Sensor for Measuring Relative Displacement of a Piston Rod Mechanical Lead-Through Transmission in an Offshore Wave Energy Converter on the Ocean Floor

Table 1

Table of technical data for optoNCDT 1700-20.

Measuring range	20 mm
Start of measuring range (SMR)	40 mm
Midrange (MMR)	50 mm
End of measuring range (EMR)	60 mm
Linearity (of FSO)	<0.015% FSO (3 μm or ±1.5 μm), from factory calibration protocol (Catalogue value: <0.08% FSO)
Resolution	1.5 μm (at 2.5 kHz without averaging)
Measuring rate	312.5 Hz–2.5 kHz (adjustable)
Light source	Semiconductor laser <1 mW, 670 nm (red)
Spot diameter
SMR	320 μm
MMR	45 μm
EMR	320 μm
Operation temperature	0⋯+ 50°C
Temperature stability	0.01% FSO/°C
Output	0–10 V, 4–20 mA or RS 422
Power supply	24 VDC, max 150 mA
Permissible ambient light (at 2.5 kHz)	10 000 lux
Laser safety class	Class 2 acc. DIN EN 60825-1: 2001-11
EMC	EN 61000-6-3, EN 61000-6-2
Housing material	Zinc die casting
Sensor cable length	0.25 m, option: 3 m or 10 m
Protection class	IP 65
Vibration	2 g/20⋯500 Hz
Mechanical shock	15 g/6 ms
Weight (with 0.25 m cable)	550 g