Go Direct® Colorimeter User Manual
Order Code: GDX-COL
Go Direct Colorimeter is used to determine the concentration of a solution by analyzing its color intensity. The cuvette slot is designed to accommodate most cuvettes with a 10 millimeter path length. The Colorimeter measures the amount of light transmitted through a sample at a user-selectable wavelength. You may choose from four wavelengths: 430 nm, 470 nm, 565 nm, and 635 nm.
Note: Vernier products are designed for educational use. Our products are not designed nor are they recommended for any industrial, medical, or commercial process such as life support, patient diagnosis, control of a manufacturing process, or industrial testing of any kind.
- Go Direct Colorimeter
- 15 polystyrene cuvettes and 15 plastic cuvette lids
- Micro USB Cable
Choose a platform below to see its compatibility requirements.
Interface LabQuest App LabQuest 3 Full support LabQuest 2 (discontinued) Full support 1 LabQuest (discontinued) Incompatible
Software Interface Graphical Analysis App for Computers No interface required Full support 1 LabQuest 3 Full support 2 LabQuest 2 (discontinued) Full support 2 3
Software Interface Graphical Analysis App for Chrome No interface required Full support LabQuest 3 Full support 1 LabQuest 2 (discontinued) Full support 1 2
Software Interface Graphical Analysis App for iOS Graphical Analysis GW for iOS No interface required Full support Full support LabQuest 3 Full support 1 2 Full support 1 2 LabQuest 2 (discontinued) Full support 1 2 3 Full support 1 2 3
Software Interface Graphical Analysis App for Android Graphical Analysis GW for Android No interface required Full support Incompatible LabQuest 3 Full support 1 2 Full support 1 LabQuest 2 (discontinued) Full support 1 2 3 Full support 1 3
Software Interface Python No interface required Full support
Software Interface NI LabVIEW
Choose a platform below to see its compatibility requirements.
Please see the following link for platform-specific connection information:
Note: This sensor does not work with the original LabQuest. It works with LabQuest 2 or LabQuest 3.
Charging the Sensor
Connect the Go Direct Colorimeter to the included USB Charging Cable and any USB device for two hours.
You can also charge up to eight Go Direct Go Direct Colorimeters using our Go Direct Charge Station, sold separately (order code: GDX-CRG). An LED on each Go Direct Colorimeter indicates charging status.
Orange LED next to the battery icon is solid while the sensor is charging.
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.
Connecting the Sensor
See the following link for up-to-date connection information:
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.|
Using the Product
Connect the sensor following the steps in the Getting Started section of this user manual. After connecting the sensor, the following steps must be completed prior to starting data collection.
- Press the < or > button on the Colorimeter to select the correct wavelength for your experiment (430 nm, 470 nm, 565 nm, or 635 nm).
- Allow the Colorimeter to warm up for about five minutes before calibrating.
- Calibrate the Colorimeter.
- Slide the lid of the Colorimeter open to reveal the cuvette slot.
- Insert a cuvette, filled with distilled water or other solvent used to prepare your solutions, for your calibration blank (100% transmittance or 0 absorbance).
Important: Line up one of the clear sides of the cuvette with the arrow at the right side of the cuvette slot. Slide the Colorimeter lid closed.
- Press the CAL button on the Colorimeter to begin the calibration process. Release the CAL button when the red LED begins to flash.
- When the red LED stops flashing, the calibration is complete. The absorbance reading should be very close to 0.000 (100%T).
- Remove the blank cuvette from the Colorimeter.
- Continue with data collection.
Calibration is required for use. See the Using the Product section for instructions.
0 to 3 (absorbance) (0 to 100% T)
0.05 to 1.0 absorbance (90% to 10% T)
430 nm, 470 nm, 565 nm, 635 nm
Care and Maintenance
Go Direct Colorimeter 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 Colorimeter 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.
Go Direct Colorimeter 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.
How the Sensor Works
Light from an LED light source passes through a cuvette containing a solution sample. Some of the incoming light is absorbed by the solution. As a result, light of a lower intensity strikes a photodiode.
Here are some tips for best data-collection practices:
- Allow the Colorimeter to warm up for about 5 minutes before calibrating.
- Fill a cuvette two-thirds to three-fourths full with liquid, including the calibration blank, so that the light travels through the liquid reliably.
- After filling a cuvette with liquid, seal the cuvette with a cap to prevent spills.
- Make sure to place a cuvette in the Colorimeter so the path of the light source travels through the clear sides of the cuvette. An arrow to the right of the cuvette slot shows the light path.
- For best results, use one cuvette to make all your measurements for a given experiment.
- If you calibrate a Colorimeter and then change the wavelength, calibrate the Colorimeter again to ensure the proper identification of the new wavelength.
For best results, a sample's absorbance or transmittance values should fall within these ranges:
- percent transmittance:10–90%
- absorbance: 0.05–1.0
Beer’s law experiment results begin to lose their linearity at absorbance values above 1.0 (percent transmittance values less than 10%). If you have a solution that transmits such a low level of light, consider diluting the solution so that it falls within this range.
If you have followed the troubleshooting steps and are still having trouble with your Go Direct Colorimeter, contact Vernier Technical Support at firstname.lastname@example.org 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.
|Plastic Cuvettes (Visible Range)||
Warranty information for this product can be found on the Support tab at www.vernier.com/gdx-col/#support
General warranty information can be found at www.vernier.com/warranty
When disposing of this electronic product, do not treat it as household waste. Its disposal is subject to regulations that vary by country and region. This item should be given to an applicable collection point for the recycling of electrical and electronic equipment. By ensuring that this product is disposed of correctly, you help prevent potential negative consequences on human health or on the environment. The recycling of materials will help to conserve natural resources. For more detailed information about recycling this product, contact your local city office or your disposal service.
Battery recycling information is available at www.call2recycle.org
Do not puncture or expose the battery to excessive heat or flame.
The symbol, shown here, indicates that this product must not be disposed of in a standard waste container.
Fill out our online support form or call us toll-free at 1-888-837-6437.