INFORMATION FOR BODC SERIES REF. NO.    33736                  
                                                                                
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                         Sea Floor Pressure Gauge Inventory Number :   6946     
                                                                                
 Start Time : 08 Sep 1973 0000 GMT                  Latitude  :  54deg 19.5min N
 End Time   : 18 Oct 1973 2300 GMT                  Longitude : 001deg 14.5min E
                                                                                
 Nominal Cycle Interval   : 3600.0 secs         Sensor Depth    :     23.00m    
                                                Sea Floor Depth :     23.00m    
                                                                                
 Positional Uncertainty   : 0.1 to 0.5 n.miles                                  
 Depth Datum              : Chart reference                                     
                                                                                
 Project                  : JONSDAP 1973                                        
                                                                                
 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  : 734/973/251                                         
                                                                                
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 Additional information stored with the data:                                   
                                                                                
    Station Z0, Southern North Sea.                                             
    Clock gained 50 seconds over 48 days, 21.5 hours; the  cycle  interval  and 
    time  values  have  been  corrected.  An  interpolation program was used to 
    produce hourly values, on the hour, for the pressure record.                
                                                                                
    Instrument characteristics and calibration factors                          
           OSTG Type 1, logger 41, sensor FM 4882/7                             
           Original sampling interval          15 minutes                       
           Integration period                        890s                       
           Temperature coefficient            45.7cm/degC                       
           Pressure sensitivity at 11.2degC    0.836Hz/cm                       
           To convert pressure to elevation the following                       
           values should be used:                                               
           Density  (from CTD casts)                                            
           1024.72 + 0.000286 * (total pressure - atmospheric pressure) kg/m3   
           Gravitational acceleration constant  9.814m/s2                       
                                                                                
    Thermistor channels failed after 3 days 15.75 hours; temperature            
    data from nearby current meter used.                                        
                                                                                
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 The following additional documents apply to this series:                       
                                                                                
  27728; Off-Shore Tide Gauge Type I                                                           
  27731; I.O.S. Calibration and Data Processing of Off-Shore Tide Gauge Data    
 Project Document        :   26423                                              
                                                                                
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