Vernier Go Direct User manual

Go Direct®ORP

(Order Code GDX-ORP)

Go Direct ORP measures the ability of a
solution to act as an oxidizing agent or
reducing agent. ORP stands for oxidation-reduction potential. For example, ORP
electrodes are often used to measure the oxidizing ability of chlorine in
swimming pools, or to determine when the equivalence point has been reached
in an oxidation-reduction reaction.

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.

What's Included

l Go Direct ORP (Go Direct Electrode Amplifier connected to a Go Direct

ORP BNC Electrode)

l Electrode storage bottle, containing pH 4/KCl solution
l Micro USBCable

Compatible Software

See www.vernier.com/manuals/gdx-o rp for a list of software compatible with Go
Direct ORP.

Getting Started

Please see the following link for platform-specific connection information:

using LabQuest, choose Wireless
Device Setup > Go Direct from the
Sensors menu.

6. Select your Go Direct sensor from
the list of Discovered Wireless
Devices. Your sensor's ID is located
near the barcode on the sensor. The
LED will blink green when it is
successfully connected.

7. Click or tap Done to enter data­collection mode.

www.vernier.com/start/gdx-orp

Charging the Sensor

Connect Go Direct ORP to the included USB Charging Cable and any USB
device for two hours. Connecting Go Direct ORP to the electrode amplifier
during charging is optional.

You can also charge up to eight Go Direct ORPSensors using our Go Direct
Charge Station, sold separately (order code: GDX-CRG).

Bluetooth Connection USB Connection

1. Install Vernier Graphical
Analysis™ on your computer,
Chromebook™, or mobile device. If
using LabQuest®, make sure
LabQuest App is up to date. See
www.vernier.com/ga4 for Graphical
Analysis availability or
www.vernier.com/downloads to
update LabQuest App.

2. Charge your sensor for at least
2hours before first use.

3. Turn on your sensor by pressing the
power button once. The LED will
blink red.

4. Launch Graphical Analysis or turn
on LabQuest.

5. If using Graphical Analysis, click
or tap Sensor Data Collection. If

1. Install Graphical Analysis on your
computer or Chromebook. If using
LabQuest, make sure LabQuest
App is up to date. See
www.vernier.com/ga4 for software
availability or
www.vernier.com/downloads to
update LabQuest App.

2. Connect the sensor to the USB
port.

3. Launch Graphical Analysis or turn
on LabQuest. You are now ready to
collect data.

Note: This sensor does not work with
the original LabQuest. It works with
LabQuest 2 or LabQuest 3.

Charging

Fully charged

Powering the Sensor

Turning on the sensor

Putting the sensor in sleep
mode

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Blue LED is on steady while sensor is connected
to the Charging Cable or Charge Station.

Blue LED is off when charging is complete.

Press button once. Red LED indicator flashes
when unit is on.

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:

www.vernier.com/start/gdx-orp

Connecting via Bluetooth

Ready to connect Red LED flashes when sensor is awake and

ready to connect.

Connected Green LED flashes when sensor is connected via

Bluetooth.

Connecting via USB

Connected and charging Blue and Green LED are solid when sensor is

connected to Graphical Analysis via USB and
unit is charging. (Green LED is obscured by the
blue one.)

Connected, fully charged Green LED solid when sensor is connected to

Graphical Analysis via USB and the unit is fully
charged.

By default, the units displayed will be in mV. See www.vernier.com/til/3984 to
change the displayed units.

Calibrating the Sensor

Calibration of Go Direct ORP is not supported. ORP readings are in mV. The
Go Direct Electrode Amplifier mV response is dictated by the amplifier (as
opposed to the electrode) and does not change over time, temperature, or with
the electrode being attached. Calibration of Go Direct ORP in mV by putting it
into different standards does not provide a better mV calibration. It provides a
worse calibration as it will assume the ORP electrode is perfect. Then the mV
reading will be off regardless of which electrode is connected.

Specifications

Response time 90% of final reading is one second in a buffer

Range –1,000 mV to +1,000 mV

Typical accuracy ± 15 mV

Resolution 0.01 mV

USBspecification 2.0

Charging via USB,
connected via Bluetooth

Blue LED is solid and green LED is flashing, but
the green flashing LED looks white because it is
overwhelmed by the blue.

Identifying the Sensor

When two or more sensors are connected, the sensors can be identified by
tapping or clicking Identify in Sensor Information.

Using the Product

1. Remove the storage bottle from the electrode by unscrewing the lid and
removing the bottle and lid.

2. Thoroughly rinse the lower section of the probe, especially around the bulb­shaped tip, using distilled or deionized water.

3. Connect the sensor following the steps in the Getting Started section of this
user manual.

4. When you are finished making measurements, rinse the electrode with
distilled water.

5. Slide the cap onto the electrode body, and then screw the cap onto the
storage bottle so the tip of the electrode is immersed in the storage solution.

Important: Do not fully submerge the sensor. The BNC connection is not
waterproof.

Do not leave the electrode in acids or bases with concentrations greater than

1.0M for periods longer than 5 minutes.

Wireless specification Bluetooth 4.2

Maximum wireless range 30 m

Dimensions EA: 8.5 cm × 3 cm × 1.75 cm

ORP: 15.5 cm long, 12 mm OD

Battery 300 mA Li-Poly

Battery life (single full
charge)

Battery life (long term) ~500 full charge cycles (several years depending

~24 hours

on usage)

Care and Maintenance

Short-term storage (up to 24 hours): Place the electrode in pH 4 or pH 7 buffer
solution. It should never be stored in distilled water.

Long-term storage (more than 24 hours): Store the electrode in a pH 4
buffer/KCl storage solution in the storage bottle. The ORP electrode is shipped
in this solution. Vernier sells 500 mL bottles of pH Storage Solution (order code
PH-SS), or you can prepare additional storage solution by adding 10 g of solid
potassium chloride (KCl) to 100 mL of pH 4 buffer solution. Vernier sells a pH
Buffer Capsule kit (PH-BUFCAP) that includes a buffer solution preservative.
Storing the electrode in this solution contributes to electrode longevity and
retains electrode response time when the unit is placed back into service.

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If the electrode is inadvertently stored dry for a short period of time, immerse the
tip in the pH 4 buffer/KCl storage solution for a minimum of 8 hours prior to
use. If the readings are still not accurate after calibration or if the response is
slow, try shocking the sensor as described in the Troubleshooting section.

Battery Information

Go Direct ORP contains a small lithium-ion battery in the handle. 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 ORP 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 ORP 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

The electrode has two components: a measuring half cell comprised of platinum
metal immersed in the solution in which the redox reaction is taking place, and
a reference half cell (sealed gel-filled Ag/AgCl) to which the platinum half cell
is referenced.

Go Direct ORP can measure redox potential in the range of –1000 to +1000
mV. Readings toward the positive region of this range indicate a strong
oxidizing agent, while readings toward the negative region indicate a strong
reducing agent.

Troubleshooting

Examine the glass bulb. If it is broken, ORP readings will be incorrect.

Occasionally, mold will grow in the pH 4 buffer/storage solution. Mold will not
harm the electrode and can easily be removed using a mild detergent solution.
Mold growth in the storage solution can be inhibited by adding a buffer
preservative.

Residue on the tip of an ORP electrode can cause the readings to be noisy. To
clean the electrode, use a soft cloth to wipe a small amount of ethyl alcohol or
isopropyl alcohol around the globe-shaped tip of the probe. Rinse the tip with
distilled water, and repeat the alcohol cleaning one more time.

For additional troubleshooting and FAQs, see www.vernier.com/til/3967

Repair Information

If you have followed the troubleshooting steps and are still having trouble with
your Go Direct ORP, contact Vernier Technical Support at [e-mail]
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.

Accessories/Replacements

Item Order Code

Electrod e Sto rage Solution, 500 mL

Storage Solu tion Bottles, pkg of 5

Go Direct ORP Electrode

Go Direct Electrode Amplifier

Micro USB Cable

Go Direct 300 mAh Replacement Battery

USB-C to Micro USB Cab le

PH-SS
BTL
GDX-ORP-BNC
GDX-EA
CB-USB-MICRO
GDX-BAT-300
CB-USB-C-MICRO

Warranty

Warranty information for this product can be found on the Support tab at

www.vernier.com/gdx- orp

General warranty information can be found at www.vernier.co m/warranty

Disposal

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.

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Federal Communication Commission Interference Statement

This equipment has been tes ted and found to comply with the li mits for a Cl ass B digi tal devic e, pursuant to Part 15 of the FCC rules.
These l imits are designed to provide reasonable protection agains t harmful i nterference in a residential ins tallati on. This equipment
generates, uses and c an radiate radio frequency energy and, if not instal led and us ed in accordance with the i nstructions, may c ause
harmful i nterference to radio communic ations. However, there i s no guarantee that interference will not occur in a particular i nstall ation. If
this equipment does cause harmful interference to radio or telev isi on reception, whic h c an be determined by turning the equipment off and
on, the user is enc ouraged to try to c orrect the interference by one or more of the fol lowing measures:

Reorient or reloc ate the receiv ing antenna.

Increase the s eparation between the equipment and receiver.

Connect the equipment into an outlet on a c ircuit different from that to which the receiver i s connected.

Consult the dealer or an ex perienced radio/TV technici an for help.

FCC Caution

This devic e complies wi th P art 15 of the FCC Rules . Operation i s subj ect to the fol lowing two c onditions:

(1) this devi ce may not cause harmful interference and

(2) this devi ce must acc ept any interference received, i ncluding i nterference that may c ause undesired operation

RF Exposure Warning

The equipment compli es with RF exposure limi ts set forth for an uncontrolled environment. The antenna(s) used for this transmitter must
not be c o-located or operating i n conjuncti on with any other antenna or transmitter. You are c autioned that c hanges or modific ations not
expressly approved by the party responsible for complianc e c ould void y our authority to operate the equipment.

IC Statement

This devic e complies wi th Indus try Canada lic ense-exempt RSS s tandard(s). O peration is subjec t to the foll owing two c onditions:

(1) this devi ce may not cause i nterference, and

(2) this devi ce must acc ept any interference, inc luding interference that may caus e undes ired operation of the dev ice.

Industry Canada - C lass B This di gital apparatus does not ex ceed the Class B l imits for radio noise emiss ions from digital apparatus

as set out in the interference-causi ng equi pment s tandard entitled “Digital Apparatus,” ICES-003 of Industry Canada. O peration i s subj ect
to the fol lowing two c onditions: (1) this devic e may not c ause interference, and

(2) this devi ce must acc ept any interference, inc luding interference that may caus e undes ired operation of the dev ice.

To reduce potential radio interference to other users, the antenna type and its gain should be so chos en that the equival ent i sotropicall y
radiated power (e.i.r.p.) is not more than that permitted for suc cess ful communicati on.

RF exposurewarning: The equipment compl ies with RF expos ure li mits s et forth for an uncontrolled envi ronment. The antenna(s) used

for this transmitter must not be co-located or operating in conjunc tion with any other antenna or transmitter.

Le présent appareil est conforme aux CNR d’Industrie Canada appli cables aux appareils radio exempts de lic ence. L’exploi tation est
autorisée aux deux conditi ons suiv antes :

(1) l’appareil ne doit pas produire de brouill age, et

(2) l’appareil doit ac cepter tout interférence radioélec trique, même si c ela résulte à un brouillage susc eptible d’en compromettre le
fonctionnement.

Cet appareil numérique respecte l es li mites de bruits radioélectriques applic ables aux appareils numériques de Class e B prescrites dans
la norme sur le matériel interférant-brouilleur: “Appareils Numériques,” NMB-003 édi ctée par i ndustrie Canada. L’util isati on es t soumise
aux deux conditi ons suiv antes:

(1) cet appareil ne peut c auser d’i nterférences, et

(2) cet appareil doit accepter toutes interférences, y comprises cel les s usceptibl es de provoquer un disfoncti onnement du dispos itif.

Afin de réduire les i nterférences radio potentielles pour les autres uti lis ateurs, l e type d’antenne et s on gai n doivent être c hoisie de tell e
façon que l ’équiv alent de puissanc e i sotrope émi s (e.i.r.p) n’est pas plus grand que celui permis pour une communicati on établ ie.

Avertissement d’exposition RF: L’ équipement es t conforme aux li mites d’ex positi on aux RF établies pour un environnement non

supervisé. L’antenne (s) uti lis ée pour ce transmetteur ne doit pas être j umelés ou fonctionner en c onjonction avec toute autre antenne ou
transmetteur.

Note: This product is a s ensitiv e measurement devic e. For best results, use the cables that were provided. Keep the devic e away from

electromagnetic noise s ources, such as mic rowaves, monitors, elec tric motors, and appli ances.

13979 SW Millikan Way • Beaverton, OR 97005-2886

Vernier Software & Technology

Toll F ree ( 888) 837-6437 • ( 503) 277-2299 • Fax [phone]

[e-mail] • www.vernier.com

Rev 3/1 5/2 021

Go Di rect, Graphi cal Analysis, LabQuest , and other marks sh own are our trademarks or regis tered trademarks in
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