RETIRED ›
This product is no longer available.
OBS-3A
 
OBS-3A Turbidity & Temperature Monitoring System (Case Not Included)
 
Turbidity Ranges - show details
-N1 -N1 0-100 NTUs
Select this option if the highest turbidity readings will be less than 100 NTUs.
-N2 -N2 0-250 NTUs
Select this option if the turbidity readings might be larger than 100 NTUs but will always be less than 250 NTUs.
-N3 -N3 0-500 NTUs
Select this option if the turbidity readings might be larger than 250 NTUs but will always be less than 500 NTUs.
-N4 -N4 0-1000 NTUs
Select this option if the turbidity readings might be larger than 500 NTUs but will always be less than 1000 NTUs.
-N5 -N5 0-2000 NTUs
Select this option if the turbidity readings might be larger than 1000 NTUs but will always be less than 2000 NTUs.
-N6 -N6 0-4000 NTUs
Select this option if the turbidity readings might be larger than 2000 NTUs.
Pressure Sensor Options - show details
-NP -NP No Pressure Sensor
Select this option if you do not want to measure depth or want to use your own pressure transducer.
-10 -10 0-10m (14 PSI) PT
Select this option if the depth will always be less than 10 meters.
-20 -20 0-20m (28 PSI) PT
Select this option if the depth might be larger than 10 meters but will always be less than 20 meters.
-50 -50 0-50m (71 PSI) PT
Select this option if the depth might be larger than 20 meters but will always be less than 50 meters.
-100 -100 0-100m (142 PSI) PT
Select this option if the depth might be larger than 50 meters but will always be less than 100 meters.
-200 -200 0-200m (284 PSI) PT
Select this option if the depth might be larger than 100 meters, but will always be less than 200 meters.
Conductivity Sensor - show details
-NS -NS No Conductivity
Select this option if you do not want to measure conductivity.
-CS -CS Conductivity Sensor
Select this option if you want the OBS-3A to include a conductivity sensor.
Product Details
Restockable Yes
Warranty 1 year
Compliance CE Compliance Image

Common Accessories

21099
 
One 21099 carrying case holds two OBS-3A systems.
425
 
Three alkaline D-cells power the OBS-3A. These batteries are not included with the OBS-3A. Customers can purchase the 425 alkaline D-cells or purchase D-cells from their local store. The per battery price is listed above.
 
The 21906 allows a user-supplied lithium battery to power the OBS-3A instead of three D-cell alkaline batteries.
21319
 
Campbell Scientific offers a choice of four field cables that attach the OBS-3A to a PC. The cables differ in their length. The 21319 is a 30-meter cable.

Replacement Parts

 
The OBS-3A system has this plug locking sleeve attached to it. The 21122 may be purchased to replace a lost or damaged plug locking sleeve.
20792
 
The 20792 comes with the OBS-3A Turbidity System. This test cable is used to connect the OBS-3A to a PC. The 20792 may be purchased to replace a lost or damaged cable.
21149
 
This 5/64" Hex Driver is used with the OBS-3A Turbidity System. The 21149 may be purchased to replace a lost or damaged Hex Driver.
21120
 
This connector plug comes attached to the OBS-3A Turbidity System. The 21120 may be purchased to replace a lost or damaged plug.
 
The 21229 includes the following: OBS-3A test cable, dummy plug to protect the connector if the system is submerged without a cable, ResourceDVD, spare O-rings and screws, and hex driver.

Services

 
When the 20914 is ordered, Campbell Scientific will perform a 3-point turbidity recalibration on the turbidity sensor contained in the OBS-3A. An RMA (Returned Material Authorization) is required.
 
The 21547 provides a recalibration of the fast-response, stainless steel-clad thermistor contained in the OBS-3A. Before and after calibration sheets are supplied. An RMA is required.
 
The 21548 provides a recalibration of the conductivity probe contained in the OBS-3A. Before and after calibration sheets are supplied. An RMA is required.
 
The 21549 provides a recalibration of the semiconductor piezoresistive strain gage contained in the OBS-3A. Before and after calibration sheets are supplied. An RMA is required.