INFORMATION FOR BODC SERIES REF. NO.    34113                  
                         Sea Floor Pressure Gauge Inventory Number :   6931     
 Start Time : 08 May 1980 0652 GMT                  Latitude  :  51deg 20.3min N
 End Time   : 18 Jun 1980 1407 GMT                  Longitude : 003deg 06.2min W
 Nominal Cycle Interval   :  900.0 secs         Sensor Depth    :      4.70m    
                                                Sea Floor Depth :      4.70m    
 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  : 805/980/129                                         
 Additional information stored with the data:                                   
    Station Steepholme, Severn Estuary.                                         
    Clock gained 12 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 284             
           Original sampling interval          15 minutes                       
           Integration period                        900s                       
           Temperature coefficient           -3.28Hz/degC                       
           Pressure sensitivity at 9.867degC  0.1027Hz/mb                       
           To convert pressure to elevation the following                       
           values should be used:                                               
           Density                            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.  Inspection of 
    the site at 1430 15 May revealed that the  position  of  the  recorder  had 
    moved  about  15m  to the east due to dragging when the buoys were removed. 
    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