INFORMATION FOR BODC SERIES REF. NO.    34125                  
                         Sea Floor Pressure Gauge Inventory Number :   6932     
 Start Time : 08 May 1980 1907 GMT                  Latitude  :  51deg 24.4min N
 End Time   : 18 Jun 1980 1622 GMT                  Longitude : 003deg 09.7min W
 Nominal Cycle Interval   :  900.0 secs         Sensor Depth    :      4.00m    
                                                Sea Floor Depth :      4.00m    
 Positional Uncertainty   : 0.1 to 0.5 n.miles                                  
 Depth Datum              : Instantaneous                                       
 Data Category            : Offshore sea floor pressure series                  
 Instrument Type          : Tide gauge (unspecified)                            
 Instrument Mounting      : Sea floor - fixed                                   
 Originator Laboratory    : Proudman Oceanographic Laboratory, Bidston, UK      
 Originator's Identifier  : 806/980/129                                         
 Additional information stored with the data:                                   
    Station Lavernock Point, Severn Estuary.                                    
    Clock gained 20 seconds over 69 days 6.25 hours;  the  cycle  interval  and 
    time values have been corrected.                                            
    Instrument characteristics and calibration factors                          
           Teleost Pressure Recorder, sensor DIG, serial number 281             
           Original sampling interval          15 minutes                       
           Integration period                        900s                       
           Temperature coefficient          -0.625Hz/degC                       
           Pressure sensitivity at 9.867degC  0.1247Hz/mb                       
           To convert pressure to elevation the following                       
           values should be used:                                               
           Density (from CTD casts)           1022.0kg/m3                       
           Gravitational acceleration constant  9.812m/s2                       
    A Danforth anchor with 18m of chain was deployed connected to the  recorder 
    box  so  that  the  rig  was  parallel  to the ebb and flood tide.  Density 
    calculated from measured  temperature  and  a  salinity  of  29  parts  per 
 The following additional documents apply to this series:                       
  27731; I.O.S. Calibration and Data Processing of Off-Shore Tide Gauge Data    
  27840; Teleost Pressure Recorder