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.

Add to your Quote List


Product Details
Typically Ships Within 14 - 21 Days
Restockable Yes
Warranty 1 year
Compliance CE Compliance Image

The "Typically Ships Within" value is an estimate of the number of calendar days within which this product is ready to ship from Campbell Scientific. Orders with more than 10 built-to-order products will likely increase the time needed to prepare the order for shipping.

To estimate how long it will take to receive an order that contains multiple products, combine the longest Ships Within value with the transit time of the shipping method you select.

Some specialized products have long Ships Within values. Because of this, you might consider submitting a separate order for these products so your other products won't be delayed.

Ships With
(1) 21229 OBS-3A Accessory Kit
(1) Calibration Certificate

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.
21214
 
Campbell Scientific offers a choice of four field cables that attach the OBS-3A to a PC. The cables differ in their length. The 21214 is a 10-meter field cable.
21318
 
Campbell Scientific offers a choice of four field cables that attach the OBS-3A to a PC. The cables differ in their length. The 21318 is a 20-meter cable.
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.
 
OBS-3ACBL-L OBS-3A Field Cable
 
Campbell Scientific offers a choice of four field cables that attach the OBS-3A to a PC. The cables differ in their length. The OBS-3ACBL-L has a user-specified length. A user-specified cable length takes more time to manufacture. The delivery time of the OBS-3ACBL-L is 4 to 6 weeks.
Cable Length - show details
-L m per sensor cable

Allowed values: 1-305 m, increments of 1 m

 
If ordered, customer must send Campbell Scientific a dry sample of sedimentation from the water that will be monitored.

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.