Sea Data, Inc. Mdl . 635-11 Wave and Tide Recorder 



Pressure Sensor: Paroscientific, Inc., "Digi-Quartz" 



100 psia' 



feet 

 Standard Ranges: 

 Maximum Depth: 

 Resolution - Waves: 

 Tides: 



Accuracy 



(more than 80 ft) 



(less than 80 ft) 



vs temp @ 30 ft 



Frequency Response: DC to 1.0 Hz (Nyquist limit for 0.5 -sec sampling) 



feet 





meters 



190 





58 



235 





70 



0.0035 





0.10 cm 



0.0040 





0.12 cm 



0.03 







0.05 







0.004 



ft/ 



'C (max) 



Stability: 

 vs time : 



vs temp : 



percent/ C) 



Timebase: 

 Stability: 



0.0002 percent FS/month at (almost constant) 



ocean depths 

 zero 0.0007 percent FS/°C 

 span 0.005 percent FS/°C (at 2/3 FS , 0.004 



4.194304 MHz special quartz crystal 

 0.1 ppm/°C, 1 ppm/year; unmeasurable (0.001 

 percent) pressure data error at ocean depths 



Physical Specifications: 



Size : 



Case: 7 -in. diam. by 24 in. long 



Mounts: two 0.5-in. bolt holes on 13-in. centers, 1.0-in. clearance 



Weight: 41 lb in air, with battery; 12.5 lb in water 



Pressure Case: 



Material: 6061-T6 aluminum 



Hardware: 316 stainless and Delrin insulators 



Finish: Hard- coat anodize with electrostatic epoxy overcoat 



Depth: 1,100-m operating depth 



* psia = pounds per square inch, absolute. 



A5 



