Vernier Software and Technology
Vernier Software & Technology
Tech Info Library

Salinity Sensor Troubleshooting and FAQs

Salinity Sensor, order code SAL-BTA, $119
Specifications and User Guide

TROUBLESHOOTING
-Primary Test: Plug in the sensor and start up the data-collection program. Place the sensor in distilled water. The reading should be at or near 0 ppt. Place the sensor in a 35 ppt salinity standard solution. The reading should be at or near 35 ppt. Note: This standard solution can be purchased from Vernier or made by adding 33.03 g reagent grade NaCl to enough distilled or deionized water to make 1.00 liter of solution.
-Secondary Test: Plug in the sensor and start up the data-collection program. Place the sensor in distilled water and then move the sensor to a container of tap water. The readings should change from 0 ppt to a salinity value that is appropriate for your region of the country.

RELATED TIL ENTRIES
-TIL 1399: Can I use Vernier water quality sensors in salt water or in a salt water aquarium?

SPECIFICATIONS
-new order code: SAL-BTA
-old order code: SAL-DIN
-Measurment range: 0 - 50 ppt (0 - 50,000 ppm)
-Resolution: 0.02 ppt (20 ppm)
-Accuracy: +/- 1% of full-scale reading
-Response time: 98% of full-scale reading in 5 seconds
-Temperature compensation: automatic from 5 to 35 deg C
-Temperature range (can be placed in safely): 0 to 80 deg C
-Cell constant: 10 cm-1
-Description: dip type, epoxy body, parallel platinum electrodes
-Dimensions: 12 mm OD and 150 mm length
-Typical calibration values: slope: 16.3 ppt/V intercept: 0

CALIBRATION
-Calibrate? For many experiments, calibrating the Salinity Sensor is not required. We store a
calibration equation on each sensor before shipping it, which is used as a
default by our software.

For the most accurate measurements with this sensor, we recommend calibration.
It is a simple process that takes only a few minutes.
- For instructions for Salinity Sensor calibration using Logger Pro computer
software, see TIL 2341: How do I calibrate a sensor in Logger Pro?
- For instructions for Salinity Sensor calibration using LabQuest App, see
TIL 3394: How do I manually calibrate my sensor in LabQuest?
- For instructions for Salinity Sensor calibration using Graphical Analysis
with a Chromebook, see TIL 3631: How do I manually calibrate my sensor in Graphical Analysis 4?
- For instructions for Salinity Sensor calibration using Graphical Analysis
with an iOS or Android device, see TIL 3630: How do I manually calibrate my sensor in Graphical Analysis 4 for iOS/Android?

Making Standard Calibration Solutions
If you choose to calibrate the Salinity Sensor, you will want an accurate
standard solution. Vernier sells a 35 ppt standard solution (order code SAL-ST).
To prepare your own 35 ppt standard solution using solid NaCl, use a container
with accurate volume markings (e.g., volumetric flask). Add 33.03 g NaCl to
enough distilled water to make 1 liter of solution. Use reagent grade NaCl.
Note: The Practical Salinity Scale 1978 was developed relative to a KCl
solution. Standard Methods for the Examination of Water and Wastewater
states that “A seawater with a conductivity at 15°C equal to that of a KCl
solution containing a mass of 32.4356 g in a mass of 1 kg of solution is defined
as having a practical salinity of 35.”

RELATED VERNIER PRODUCTS
Salinity Standard, order code SAL-ST, $18 (Salinity Standard, 35 ppt, 500 mL)

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