Go Direct Wide Range Pressure

Liquid & Gas Compatible: GDX-WRPL
⚬ Specifications and User Guide

Gas Compatible Only: GDX-WRP
⚬ Specifications and User Guide

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: Connect the sensor to a Vernier interface and run the data-collection program. The units for the default readings are kPa and they should be reasonable for the altitude at which the sensor is being used (around 101 kPa at sea-level). If you plug the output with your finger, the pressure should rise slightly (~5 kPa).

To ensure an airtight seal, use the included plumber’s tape on the pressure sensor’s threading.
Wrap only once and to the right, as the threading runs.

Alternative Connectors

Go Direct Wide-Range Pressure comes with two quick disconnect fittings as noted below. Also included is a two-foot section of plastic tubing designed to fit over the hose barb connector. Its standard size allows you to connect to a variety of third-party instrumentation or adapters.

• Chrome-plated Brass Quick Disconnect Tube Fitting with 1/8” NPT thread insert
• Chrome-plated Brass Quick Disconnect Tube Fitting with 1/8” hose barb insert

If you wish to purchase different quick disconnect inserts or replacements, many are available and compatible with the sensor. Contact chemistry@vernier.com for recommendations.

Unfortunately, there is not a quick disconnect luer lock option at this time. Below is an option for a luer lock set up:

Compatible Liquids—GDX-WRPL only

The GDX-WRPL features a Parylene C coating, renowned for its excellent chemical resistance and barrier properties. This coating provides protection against a variety of chemicals, making the sensor suitable for numerous laboratory applications. However, it’s essential to understand its compatibility limits to ensure the longevity and accuracy of the sensor.

SHORT-TERM EXPOSURE

• Water (distilled, deionized)
• Dilute acids (e.g., hydrochloric acid, sulfuric acid, nitric acid at concentrations ≤10%)
• Dilute bases (e.g., sodium hydroxide, ammonium hydroxide at concentrations ≤10%)
• Alcohols (e.g., isopropyl alcohol, ethanol)
• Hydrogen peroxide (≤3%)
• Aliphatic hydrocarbons (e.g., n-octane)
• Aromatic hydrocarbons (e.g., toluene, chlorobenzene)
• Ketones (e.g., acetone)

USE WITH CAUTION

• Concentrated acids and bases: May cause swelling or degradation over extended exposure.
• Strong oxidizers: Can affect the integrity of the coating.
• High-temperature solvents: Elevated temperatures can increase the permeability of the coating.

NOT RECOMMENDED

• Prolonged exposure to aggressive solvents: Such as benzoyl benzoate or x-chloronaphthalene, especially at temperatures above 150 ºC.
• Mechanical cleaning agents: Abrasive materials can damage the coating.

Best practices when using liquids:
⚬ Rinse after use: Always rinse the sensor with distilled water after exposure to chemicals to prevent residue buildup.
⚬ Avoid prolonged immersion: Limit the duration of exposure to compatible liquids to prevent potential degradation.

Specifications

• Range: 0 to 690 kPa
• Maximum pressure can withstand: 900 kPa
• Accuracy
  ⚬ factory calibration: ±2 kPa
  ⚬ custom calibration: ±1 kPa (1 point calibration at atmosphere)
• Temperature range: –40 ºC to 125 ºC
• Compatibility
  ⚬ Gas Compatible (GDX-WRP): Dry gases only
  ⚬ Liquid & Gas Compatible (GDX-WRPL): Dry gases and Parylene C liquid compatibility
• Internal volume of sensor
  ⚬ with 1/8” NPT Thread Insert attached: 0.786 mL
  ⚬ with 1/8” Hose Barb Insert attached: 0.623 mL
• Connections
  ⚬ Wireless: Bluetooth^® v4.2 (wireless range 30 m unobstructed)
  ⚬ Wired: USB 2.0 full speed
• Battery: 300 mA Li-Poly
  ⚬ Battery Life (single, full charge): ~24 hours continuous data collection
  ⚬ Battery Life (lifetime): 2 – 5 years (typical)

Calibration

Go Direct Wide-Range Pressure is calibrated to true atmospheric pressure before shipping. If you wish to re-calibrate to sea level pressure based on your elevation, perform a one-point calibration using a known value as described below. For more information, see How do I calibrate my sensor?

1. Connect the sensor to an interface and launch the software.
2. Initiate the calibration procedure.
3. Enter the known calibration value in the box.
4. Once the relative stability reading in the input field stops changing significantly, click or tap Keep to record the input value.
5. Click or tap Apply to complete the calibration process. This calibration is automatically stored to the sensor. To restore the default calibration, click Reset to Defaults.

Battery Troubleshooting

1. If the sensor won’t turn when on its own, but does when connected to a USB power source, try charging the sensor for at least 2 hours using a known-to-work USB cable.
2. If you continue to have trouble, 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 the battery is indeed at the end of its life, the battery should be replaced.
   Go Direct® 300 mAh Replacement Battery (GDX-BAT-300)
4. See How do I remove or replace a Go Direct battery? for more information (including a video).

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