Go Direct® Respiration Belt (GDX-RB)

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. Does the force on sensor read near zero when no force is applied to the strap? Does the sensor read a positive value when pulling on the short strap.

  • Force sensor test: Secure the sensor snugly to the subject using the straps and clips provided. Verify that the green LED is lit above the checkmark on the sensor label. This indicates the sensor is under proper tension. Loosen the strap if the LED above the checkmark is red, as this indicates too much tension is applied to the strap. Breath normally. Verify that a change in force corresponds with each breath.

Was the force sensor properly zeroed? In general, before collecting data you should zero the force sensor after it is attached to the subject. This additional step makes measurements more accurate.

  • Respiration rate test: Does the respiration rate read between 12-20 BPM when breathing normally? Count the number of breaths (peaks) observed in a 30 second period on the force channel. Multiply the value obtained by two. This value should be close to the respiration rate reported by the software.
  • Step count test: Have the subject walk 30 steps with the sensor attached. The number of steps reported should be close to the number of steps reported by the software.
  • Step rate test: Using the step channel, count the number of steps that occurred in a 10 second interval. Multiply the number of steps by 60 to get steps per minute. The step rate measure should be close to the step rate reported by the software.

Additional Troubleshooting

Specifications

  • Range: 0 to 50 N
  • Resolution: 0.01 N
  • Response time: 50 ms
  • Respiration rate calculation
    ⚬ Sample window: 30 s
    ⚬ Advance interval: 10 s
  • Step rate calculation:
    ⚬ Sample window: 10 s
    ⚬ Advance interval: 10 s
  • Maximum chest circumference: 140 cm
    ⚬ Short strap length: 7 cm
    ⚬ Long strap length: 130 cm
  • Sensor Dimensions: 7.6 cm x 5.7 cm x 2.1 cm (not including strap loops)
  • 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

Calibrate? No. The sensor is set to the stored calibration before shipping. You can choose to calibrate the force sensor using a one-point calibration. Place the sensor on a flat surface with the label facing up. Enter 0 N as the known force. For more information, see How do I calibrate my sensor?

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.
    ⚬ Try charging the sensor for several hours and testing again.
  2. If after charging the battery the sensor turns on while connected via USB and briefly connects to Graphical Analysis but gives repeated communication errors and/or resets the selected wavelength, then the battery may be bad. To verify this is a battery issue (and not a bad USB port or cable), 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. In this state, the sensor cannot be used even if connected by USB, so the battery will need to 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.

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Replacement Parts

Published: September 25, 2017. Updated: July 21, 2025.