Go Direct^® Air Quality Sensor (GDX-AIRQ)

Specifications and User Guide

All versions of this sensor support Remote Data Logging.

Troubleshooting

General: Press the power button on the sensor to turn it on. Connect your sensor as described in the Getting Started instructions for your device.

• Primary Test: After connecting the sensor, blow on the front, bottom part of the sensor, CO₂ levels should increase.
• Secondary Test: TBD

Storage and Sensor Maintenance

It is recommended for long term storage to store the sensor in a sealed bag, such as the bag that is included with the sensor. This will help prevent dust accumulation and exposure to any moisture or other elements.

Over time if the sensor has been exposed to a high particulate environments (eg. car exhaust pipe, wood working room, wood burning fireplace), filters on the front plate will get dirty. Using a dust blower bulb or canned air, give the filters a gentle spray to remove any large particles.

Additional Troubleshooting

• Is the Ozone sensor on the Go Direct Air Quality sensor cross-sensitive with other gasses?
• Why doesn't my Barometer show the same pressure as the weather report?

REMOTE DATA LOGGING

• Remote Data Logging Troubleshooting and FAQs
• How long will my battery last for my remote data logging experiment?
• How do I configure multiple channels of my Go Direct device for remote data logging?
• How do I check the status of my sensor during a remote data logging experiment?
• How do I bring remote logging data from multiple devices or multiple runs into a single Graphical Analysis file?

Specifications

• PM Mass Concentration Specified Range: 0–1000 µg/m³
  ⚬ PM1 size range: 0.3–1 µg
  ⚬ PM2.5 size range: 0.3–2.5 µg
  ⚬ PM10 size range: 0.3–10 µg
• CO₂ Sensor
  ⚬ Range: 0–5,000 ppm
  ⚬ Resolution: 1 ppm
• NO₂ Sensor
  ⚬ Range: 0-2 ppm
  ⚬ Resolution 0.01 ppm
  ⚬ Response time <25 min
• SO₂ Sensor
  ⚬ Range: 0-2 ppm
  ⚬ Resolution 0.01 ppm
  ⚬ Response time <30 seconds
• O₃ Sensor
  ⚬ Range: 0-2 ppm
  ⚬ Resolution 0.01 ppm
  ⚬ Response time <180 seconds
• VOC Index: 1–500
• Temperature Range: 10–40 ℃ (–10 ℃ min, 50 ℃ max short term)
• Relative Humidity Range: 20–80% (10% min, 90% max short term)
• Station Pressure Range: 260–1260 hPa
• Maximum sampling rate: 1 sample/s
• Connections
  ⚬ Wireless: Bluetooth^® v4.2 (wireless range 30 m unobstructed)
  ⚬ Wired: USB 2.0 full speed
• Battery: 650 mAh Li-Poly
  ⚬ Battery Life (single, full charge): ~24 hours
  ⚬ Battery Life (lifetime): 2 – 5 years (typical)
• Remote Data Logging Supported
  ⚬ Learn more at www.vernier.com/remote-logging

Calibration

All sensors are factory calibrated on this sensor and cannot be calibrated by the user. For accurate readings, some sensors have specific requirements.

PARTICULATE MATTER

After using in very dusty or dirty conditions, or if the Air Quality sensor has been stored out in the open, it is recommended the particulate matter sensor go through a cleaning cycle. To initiate a cleaning cycle

1. Launch the app, and connect the sensor. The PM2.5 channel should already be enabled, if not, turn it on.
2. Wait for the Sensor warm-up LED (✔) to turn green.
3. Click or tap the PM2.5 meter and choose Calibrate.
4. Click Calibrate, the Sensor warm-up LED (✔) will turn orange as the cleaning cycle takes place.
5. Click or tap Done.
6. When the Sensor warm-up LED (✔) turns green again, the sensor is ready to use.

CARBON DIOXIDE

For most accurate readings, the CO₂ sensor needs to be exposed to fresh air at least every 7 days.

BAROMETRIC PRESSURE

To accurately report barometric pressure, this channel needs to know your current elevation. This only needs to be done once if you are not changing elevations. Each time you move to a different elevation, this channel will need to be adjusted with a calibration. To enter your current elevation, follow these instructions.

1. Launch the app, connect the sensor, and turn on the Barometric Pressure channel, if not already enabled.
2. Click or tap the Barometric Pressure meter and choose Calibrate.
3. Enter your elevation in meters. Click or tap Keep.
4. Click or tap Apply.

Battery Troubleshooting

1. If the sensor can be turned on when connected by USB but not when disconnected from USB, the battery either needs charging or has reached its end of life and can no longer hold a charge.
   ⚬ First, try charging the sensor for several hours.
2. If the sensor still won’t turn on when disconnected from USB, try swapping the battery with a working sensor to see if the problem follows the battery or stays with the sensor.
   ⚬ If the problem stays with the sensor, the battery is probably not the issue.
   ⚬ If the problem follows the battery, the battery has likely reached its end of life.
3. If you intend to use this sensor wirelessly, its battery will need replacing.

Rechargeable batteries are covered by a one-year warranty.
Batteries should last two to five years in typical use.