SBE 53 Bottom Pressure Recorder
Configuration Details

SBE 53 BPR Pressure Sensor Range (approximate maximum depth) Selections -- MUST SELECT ONE

Pressure sensor is installed in connector end cap, & is not field-replaceable / swappable. While highest depth rating gives most flexibility in using SBE 53, it is at expense of accuracy & resolution. It is advantageous to use lowest range pressure sensor compatible with your intended maximum operating depth, because accuracy & resolution are proportional to sensor's full scale range. For example, comparing 2000 psia (1300 m) & 10000 psia (680 m) sensors:

• 2000 psia sensor ‑
  initial accuracy is .138 m (= 0.01% * 2000 psia * 0.689 m/psi)
• 10000 psia sensor ‑
  initial accuracy is 0.689 m (= 0.01% * 10000 psia * 0.689 m/psi)

SBE 53 BPR High Accuracy External Temperature Option

SBE 4M is shipped with Tygon tubing looped end-to-end around conductivity cell, to prevent dust & dirt from entering cell. SBE 4M is shipped dry to prevent conductivity cell damage from freezing.

When included with an SBE 53, SBE 4M includes a fitting on each end to hold an AF24173 Anti-Foulant Device. If you are deploying SBE 53 in an area where you do not think conductivity cell fouling will be a problem, you may delete fittings & anti-foulant devices for credit.

50315 provides fittings (2) to hold AF24173 Anti-Foulant Devices at each end of optional SBE 4M conductivity cell. See Application Note 70: Installing Anti-Foulant Device Mount Kit on SBE 4, 16, 19, and 21 Conductivity Cells.

• SBE 4Ms shipped with optional Anti-Foulant Devices for moored applications before October 2002 used a smaller anti-foulant device inside Tygon tubing that attached to end of conductivity cell, & did not include 50315. For those SBE 4Ms, order 50315 & 801542 AF24173 Anti-Foulant Devices first time you need new Anti-Foulant Devices. Once you have 50315, order 801542 AF24173 Anti-Foulant Devices as needed.
• SBE 4Ms shipped with optional Anti-Foulant Devices for moored applications after October 2002 include 50315 installed on SBE 4M. Order 801542 AF24173 Anti-Foulant Devices as needed.

Useful life of AF24173 Anti-Foulant Devices varies, depending on several factors. We recommend that customers consider more frequent replacement when high biological activity & strong current flow (greater dilution of anti-foulant concentration) are present. Moored instruments in high growth & strong dilution environments have been known to obtain a few months of quality data, while drifters that operate in non-photic, less turbid deep ocean environments may achieve years of quality data. Experience may be strongest determining factor in specific deployment environments.

• Mount bracket 50286 included if SBE 53 is ordered with SBE 4M (option 53-3a); this is spare.
• Cable 17695 included if SBE 53 is ordered with SBE 4M (option 53-3a); this is spare.
• Cable 171752 included if SBE 53 is order with SBE 4M (option 53-3a) & wet-pluggable connectors (option 53-4b); this is spare.