RKI Instruments GX-3R Pro

Questions and Answers

M
Megan MillerAug 13, 2025
Why does calibration fail on RKI Instruments Gas Detectors?
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  Steven ChenAug 13, 2025
  Calibration failures on RKI Instruments Gas Detectors can occur for several reasons: * The calibration values might not match the cylinder gas concentrations, so ensure the instrument is properly set up for calibration. * A saturated charcoal filter can cause elevated CO readings; replace the charcoal filter. * A bad connection may prevent the sample gas from reaching the sensors; check all calibration tubing for leaks. * The calibration cylinder may be out of gas or outdated; verify the cylinder contains an adequate supply of fresh test sample. * The sensor for the affected channel(s) may need replacement; in this case replace the sensor(s).
D
Daniel PayneAug 17, 2025
What to do if LCD shows abnormally high or low readings on RKI Instruments GX-3R Pro Gas Detectors?
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  Jason McclainAug 17, 2025
  If your RKI Instruments Gas Detector displays unusually high or low readings, consider these potential solutions: 1. Replace the sensor filter, as one of the sensor’s filters may need replacement. 2. Recalibrate the unit. 3. Replace the sensor for the affected channel(s) and calibrate the affected channel(s). 4. If you are using instruments with NH3 sensors, allow 2 hours of sensor warmup prior to operation if the sensor or batteries are newly installed or if the unit’s batteries have been completely discharged.
J
Jordan AllenAug 20, 2025
How to fix a blank LCD screen on RKI Instruments Gas Detectors?
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  vdiazAug 21, 2025
  If the LCD screen on your RKI Instruments Gas Detector is blank, try the following: * Ensure the unit is turned on by pressing and briefly holding the POWER MODE button. * Replace or recharge the batteries, as they may be depleted.
C
Christy WilliamsAug 25, 2025
What does it mean when charge LED alternates between green and orange on RKI Instruments Gas Detectors?
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  Tyrone MillerAug 25, 2025
  If the charge LED on your RKI Instruments Gas Detectors alternates between green and orange, it indicates that the charging environment is outside the allowed 0 - 40°C charging temperature range. To resolve this, move the charger to a location within the specified temperature range.
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nramosAug 28, 2025
Why does the LCD on my RKI Instruments Gas Detectors show abnormal readings?
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  Gwendolyn LewisAug 28, 2025
  If the LCD of your RKI Instruments Gas Detectors shows abnormally high or low readings while other gas detection instruments don't, it could be due to several reasons. First, try replacing the sensor filter. If the issue persists, recalibrate the unit. As a last resort, the sensor for the affected channel(s) may need replacement, so replace the sensor for the affected channel(s) and calibrate the affected channel(s).
J
John BellSep 1, 2025
What to do if calibration fails on RKI Instruments Gas Detectors?
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  Wendy EdwardsSep 1, 2025
  If your RKI Instruments Gas Detectors calibration fails, ensure the device is properly set up for calibration and that the calibration values match the cylinder gas concentrations. Also, the charcoal filter or charcoal half of the dual filter might be saturated, causing an elevated CO reading, so change the charcoal filter or dual filter. Check all calibration tubing for leaks or bad connections that may prevent the sample gas from reaching the sensors. Verify that the calibration cylinder contains an adequate supply of fresh test sample. If the fail condition continues, replace the sensor(s).
J
Justin HaleSep 5, 2025
How to fix a blank LCD on RKI Instruments GX-3R Pro Gas Detectors?
- B
  Bobby PalmerSep 5, 2025
  If the LCD is blank on your RKI Instruments Gas Detectors, first, ensure the unit is turned on by pressing and briefly holding the POWER MODE button. If it still doesn't turn on, the batteries may need replacement or recharging. Replace or recharge the batteries.
K
kcarlsonSep 8, 2025
Why is the charge LED alternating on my RKI Instruments GX-3R Pro Gas Detectors?
- D
  Derek GonzalezSep 8, 2025
  If the charge LED on your RKI Instruments Gas Detectors alternates between green and orange, it means the charging environment is outside the allowed 0 - 40°C charging temperature range. To resolve this, move the charger to a location that is within the allowed 0 - 40°C charging temperature range.

RKI Instruments GX-3R Pro Specifications

General

Detection Gases	LEL, O2, H2S, CO
LEL Range	0-100% LEL
H2S Range	0-100 ppm
CO Range	0-500 ppm
Alarms	Visual, audible, and vibrating alarms
Certifications	ATEX, IECEx, UL, CSA
Display	LCD with backlight
Target Gas	Combustible Gas, Oxygen, Hydrogen Sulfide, Carbon Monoxide
Sensor Type	Electrochemical (O2, H2S, CO), Catalytic (LEL)
Resolution	1 ppm for H2S and CO, 0.1% for O2
Battery Life	Up to 18 hours
Operating Temperature	-20°C to +50°C
Humidity Range	0-95% RH (non-condensing)
Ingress Protection	IP66
O2 Range	0-30% vol

Summary

Introduction to the GX-3 R Pro

About the GX-3 R Pro

Details the GX-3R Pro's advanced detection system, features, and applications.

GX-3 R Pro Specifications

Provides detailed specifications for standard, IR, and EC sensors and the GX-3R Pro itself.

GX-3 R Pro Instrument Description

Instrument Components Overview

Details the physical components and location of parts on the GX-3R Pro.

Sensors and Filters

Explains the types of sensors and filters used for gas detection and their functions.

Battery Pack and Accessories

Explains power sources and lists included and optional accessories.

Operating the GX-3 R Pro

Starting Up and Initial Setup

Details the procedure for starting up, getting ready for operation, and demand zero.

Measuring Mode Operation

Explains continuous monitoring and normal operation in Measuring Mode.

Understanding Alarms and Responses

Covers alarm indications, types, and procedures for responding to them.

Display Mode Features

Key Display Screens

Explains the Peak, STEL, and TWA screens for viewing gas readings.

Calibration and Bump Test Information

Shows the dates of the last successful calibration and bump tests for sensors.

Alarm Points and Settings

Displays configured gas alarm settings and allows adjustment of display features.

User Mode and Calibration Procedures

Entering and Using User Mode

Provides instructions for entering User Mode and tips for navigation.

Performing Bump Tests and Calibrations

Details procedures for performing bump tests and gas calibrations.

Configuring Alarm and Bump Settings

Allows adjustment of calibration parameters, bump test settings, and alarms.

Instrument Maintenance and Troubleshooting

Troubleshooting Common Issues

Provides solutions for error messages, symptoms, and probable causes.

Battery Replacement and Recharging

Details procedures for replacing alkaline batteries and recharging Li-ion batteries.

Replacing Sensors and Filters

Guides the user through replacing sensor filters, hydrophobic dust filters, and sensors.

RK Link Phone App Integration

App Installation and Pairing

Guides users through downloading, installing, and pairing the RK Link app.

Managing Notifications and Parameters

Allows configuring app notifications, owner info, and changing instrument parameters.

Viewing Device Information

Allows viewing serial number, IDs, and calibration/bump test history via the app.

Maintenance Mode Operations

Entering and Using Maintenance Mode

Provides instructions for accessing Maintenance Mode and tips for its use.

Performing Gas Tests and Setting Dates

Allows performing gas tests and managing sensor/battery replacement dates.

Configuring Passwords and Defaults

Enables setting Maintenance Mode passwords and performing factory defaults.

Gas Select Mode Functions

Entering and Navigating Gas Select Mode

Provides instructions for accessing Gas Select Mode and tips for navigation.

Changing Gas Combinations and Alarm Points

Allows changing target gases for channels and saving alarm points.

Stealth, LEL, and Exiting Gas Select Mode

Configures stealth settings, LEL definitions, and exiting the mode.

Interference Information by Sensor

HCN Sensor Interference

Lists interference values for various gases detected by the HCN sensor.

NO2 Sensor Interference

Lists interference values for various gases detected by the NO2 sensor.

H2 S and CO Sensor Interference

Lists interference values for H2S and CO/H2S sensors.

NH3 Sensor Interference

Lists interference values for various gases detected by the NH3 sensor.

Product Warranty Information

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RKI Instruments GX-3R Pro - User Manual

Table of Contents