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APPLICATION NOTE NO. 64-1 revised April 2008
Plumbing Installation - SBE 43 DO Sensor and
Pump on a CTD
This Application Note describes installation of an SBE 43 Dissolved Oxygen (DO) Sensor and pump
(and associated plumbing) for:
• Profiling applications – on an SBE 9plus CTD, using PN 90087 Universal Plumbing Kit. The plumbing
guidelines for the SBE 9plus also apply to an SBE 19, 19plus, 19plus V2, or 25 CTD, except as noted.
• Moored applications - on an SBE 16plus, 16plus-IM, 16plus V2, 16plus-IM V2, or SBE 19plus or 19plus V2
(used in moored mode), using PN 90087 Universal Plumbing Kit.
PROFILING APPLICATIONS
Preparation
Parts Included in PN 90087 Universal Plumbing Kit
PN Description Quantity
23337 Pump air release valve - for vertical configuration only 1
30387 Tube, 1/2" Y-fitting - for connection to pump air release valve, vertical configuration only 1
30388 Tygon tubing, 19 mm (0.75 in.) OD, 13 mm (0.5 in.) ID 4 ft
30579 Tygon tubing, 13 mm (0.5 in.) OD, 9.5 mm (0.375 in.) ID - for connections to DO sensor 0.5 ft
30389 Cable tie, 102 mm (4 in.) - to secure tubing connections 20
30458 Cable tie, 381 mm (15 in.) - to secure Y-fitting to main housing 2
Tools Required
Sharp knife or scalpel for cutting tubing
Straight-edge ruler for measuring and cutting
Installation
Note for SBE 9plus or 25:
If your conductivity sensor does not have a
conductivity tube support, install the conductivity
tube support kit before installing the plumbing
(see Application Note 36 for installation details).
Conductivity tube support kit:
Part Number 50094 for aluminum sensors
Part Number 50108 for titanium sensors
Basic considerations for plumbing installation:
• Use the minimum tubing lengths necessary, but avoid tight bends in the tubing. Tight bends place stress on the
tubing connections at the sensors, which can lead to failures at the connections.
• Do not create any vertical loops in the tubing. Loops trap air, preventing the pump from working properly.
• Secure each tubing connection with two cable ties.
Plumbing installation details differ, depending on whether the sensors will be deployed in a horizontal or vertical
configuration, as explained in the following sections.
Sea-Bird Electronics, Inc.
1808 136th Place NE
Bellevue, WA 98005
USA
Phone: (425) 643-9866
Fax: (425) 643-9954
E-mail: seabird@seabird.com
Website: www.seabird.com
Conductivity
tube support
229
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