• Go Direct Turbidity Sensor
• Micro USB Cable
• 3.5 mL polystyrene cuvettes (15)
• plastic cuvette lids (15)

Choose a platform below to see its compatibility requirements.

LabQuest

Interface	LabQuest App
LabQuest 3	Full support
LabQuest 2	Full support 1
LabQuest	Incompatible

Compatibility Notes

1. Wireless connection of this sensor to a LabQuest 2 requires a Go Direct Bluetooth Adapter (discontinued) when used with some older LabQuest 2 models.

Computers

	Software
Interface	Graphical Analysis	Graphical Analysis (Web App)
No interface required	Full support	Full support
LabQuest 3	Full support 1	Incompatible
LabQuest 2	Full support 1 2	Incompatible

Compatibility Notes

1. Connect this sensor directly to a computer or Chromebook via a USB or wireless Bluetooth^® connection for best results. Alternatively, this sensor is fully supported when used with LabQuest 2 or LabQuest 3 when the LabQuest is connected via Wireless Data Sharing.
2. Wireless connection of this sensor to a LabQuest 2 requires a Go Direct Bluetooth Adapter (discontinued) when used with some older LabQuest 2 models.

Chromebook

	Software
Interface	Graphical Analysis (Web App)
No interface required	Full support

iOS

	Software
Interface	Graphical Analysis	Graphical Analysis GW
No interface required	Full support	Incompatible
LabQuest 3	Full support 1 2	Full support 1 2
LabQuest 2	Full support 1 2 3	Full support 1 2 3

Compatibility Notes

1. Connect this sensor directly to a supported mobile device via a wireless Bluetooth^® connection for best results.
2. iOS and Android^™ devices can only connect to LabQuest 2 or LabQuest 3 via Wireless Data Sharing.
3. Wireless connection of this sensor to a LabQuest 2 requires a Go Direct Bluetooth Adapter (discontinued) when used with some older LabQuest 2 models.

Android

	Software
Interface	Graphical Analysis	Graphical Analysis GW
No interface required	Full support	Incompatible
LabQuest 3	Full support 1 2	Full support 1
LabQuest 2	Full support 1 2 3	Full support 1 3

Compatibility Notes

1. iOS and Android^™ devices can only connect to LabQuest 2 or LabQuest 3 via Wireless Data Sharing.
2. Connect this sensor directly to a supported mobile device via a wireless Bluetooth^® connection for best results.
3. Wireless connection of this sensor to a LabQuest 2 requires a Go Direct Bluetooth Adapter (discontinued) when used with some older LabQuest 2 models.

Python

	Software
Interface	Python
No interface required	Full support

Javascript

	Software
Interface	Javascript
No interface required	Full support 1

Compatibility Notes

1. A wireless Bluetooth^® connection can be made with Go Direct sensors on any platform running a browser with WebBluetooth support. However, only a few operating systems have been tested and testing has been limited.

LabVIEW

	Software
Interface	NI LabVIEW
No interface required	Full support

Connect the Go Direct Turbidity Sensor to the included USB Charging Cable and any USB device for two hours.

You can also charge up to eight Go Direct Go Direct Turbidity Sensors using our Go Direct Charge Station, sold separately (order code: GDX-CRG). An LED on each Go Direct Turbidity Sensor indicates charging status.

Charging	Orange LED next to the battery icon is solid while the sensor is charging.
Fully charged	Green LED next to the battery icon is solid when the sensor is fully charged.

Turning on the sensor	Press button once. Red LED indicator flashes when unit is on.
Putting the sensor in sleep mode	Press and hold button for more than three seconds to put into sleep mode. Red LED indicator stops flashing when sleeping.

See the following link for up-to-date connection information:

www.vernier.com/start/gdx-trb

Connecting via Bluetooth

Ready to connect	Red LED next to the Bluetooth icon flashes when sensor is awake and ready to connect.
Connected	Green LED next to the Bluetooth icon flashes when sensor is connected via Bluetooth.

Connecting via USB

Connected and charging	Orange LED next to the battery icon is solid when the sensor is connected to Graphical Analysis via USB and the unit is charging. LED next to Bluetooth icon is off.
Connected, fully charged	Green LED next to the battery icon is solid when the sensor is connected to Graphical Analysis via USB and fully charged. LED next to Bluetooth icon is off.
Charging via USB, connected via Bluetooth	Orange LED next to the battery icon is solid when the sensor is charging. Green LED next to the Bluetooth icon flashes.

Connect the sensor following the steps in the Quick Start section of this user manual

1. Allow the sensor to warm up for at least one minute.
2. Slide the lid of the sensor open to reveal the cuvette slot.
3. Fill a cuvette with sample water and place a cap on the cuvette.
4. Gently invert the sample water to mix any particles that are suspended in the sample or that may have settled to the bottom. Important: Do not shake the sample. Shaking will introduce tiny air bubbles that will affect the reading.
5. Wipe the outside of the cuvette with a soft, lint-free cloth or tissue.
6. Insert the cuvette into the cuvette slot and slide the lid closed.
7. Monitor the turbidity value. Note: Particles in the water will settle over time and show a slow downward drift in turbidity readings. Take your readings soon after placing the cuvette in the senso

The sensor is factory calibrated. For most experiments, calibrating the Turbidity Sensor is not required. If desired, the sensor can be calibrated using a known standard.

To calibrate the sensor in Graphical Analysis, complete the following steps.

1. Click or tap the sensor meter to view sensor options.
2. Select Calibrate and follow the applicable prompts on the Calibrate Sensor screen.

In order to calibrate Go Direct Turbidity, you need a known calibration solution and a blank (distilled water). A calibration solution set is available from Vernier (GDX-TRB-CAL) that includes a 100 NTU and 800 NTU standard.

Once you have calibrated a Go Direct sensor, the calibration is automatically stored to the sensor and will be used each time you connect to your device. You can always choose to restore factory defaults if you feel the custom calibration is invalid.

To restore factory defaults in Graphical Analysis, complete the following steps.

1. Click or tap the live readouts meter and choose Calibrate.
2. Click or tap Reset Calibration.
3. A window will appear warning you that you are about to reset the calibration. Choose Reset Calibration.

For additional calibration information, see www.vernier.com/til/4011

Colorimeter range	0 to 3 (absorbance) (0 to 100% T)
Useful range	0.05 to 1.0 absorbance (90% to 10% T)
Wavelengths	430 nm, 470 nm, 565 nm, 635 nm

Battery Information

Go Direct Turbidity Sensor contains a small lithium-ion battery. The system is designed to consume very little power and not put heavy demands on the battery. Although the battery is warranted for one year, the expected battery life should be several years. Replacement batteries are available from Vernier (order code:
GDX-BAT-300).

Storage and Maintenance

To store Go Direct Turbidity Sensor for extended periods of time, put the device in sleep mode by holding the button down for at least three seconds. The red LED will stop flashing to show that the unit is in sleep mode. Over several months, the battery will discharge but will not be damaged. After such storage, charge the device for a few hours, and the unit will be ready to go.

Exposing the battery to temperatures over 35°C (95°F) will reduce its lifespan. If possible, store the device in an area that is not exposed to temperature extremes.

Water Resistance

Go Direct Turbidity Sensor is not water resistant and should never be immersed in water.

If water gets into the device, immediately power the unit down (press and hold the power button for more than three seconds). Disconnect the sensor and charging cable, and remove the battery. Allow the device to dry thoroughly before attempting to use the device again. Do not attempt to dry using an external heat source.

Infrared light is directed at a cuvette containing the sample water. This light is scattered in all directions off the particles in the water. A detector, consisting of a photodiode, is placed at a 90° angle to the light source. The amount of light being scattered directly into the detector is measured in volts and translated into turbidity units. This style of turbidity sensor is called a nephelometer.

Here are some tips for best data-collection practices:

• After filling a cuvette with liquid, seal the cuvette with a cap to prevent spills.
• Gently invert the sample before measuring to evenly distribute particles without introducing air bubbles.
• For best results, use one cuvette to make all your measurements for a given experiment.

If you have followed the troubleshooting steps and are still having trouble with your Go Direct Turbidity Sensor, contact Vernier Technical Support at support@vernier.com or call 888-837-6437. Support specialists will work with you to determine if the unit needs to be sent in for repair. At that time, a Return Merchandise Authorization (RMA) number will be issued and instructions will be communicated on how to return the unit for repair.

Accessory	Order Code
Go Direct Charge Station	GDX-CRG
Cuvette Rack	CUV-RACK
Go Direct Turbidity Calibration Standard	GDX-TRB-CAL
Plastic Cuvettes (Visible, 4-Sided Clear)	CUV-4S
Replacement	Order Code
Micro USB cable	CB-USB-MICRO
Go Direct 300 mAh Replacement Battery	GDX-BAT-300