RKI Instruments GX-3R Operating Manual

GX-3R

Operator’s Manual

Part Number: 71-0477

Revision: P1

Released: 5/15/19

www.rkiinstruments.com

WARNING

Read and understand this instruction manual before operating instrument. Improper use of the gas monitor could result in bodily harm or death.

Periodic calibration and maintenance of the gas monitor is essential for proper operation and correct readings. Please calibrate and maintain this instrument regularly! Frequency of calibration depends upon the type of use y ou have and th e sensor types. Typical calibration frequencie s for most applications are between 1 and 3 months, but can be required more often or less often based on your usage.

GX-3R Operator’s Manual

Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

About the GX-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Instrument Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Alarm LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Vibrator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Infrared Communications Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Charging Socket and Battery Pack. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Included Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Alligator Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Rubber Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Wrist Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Single-Unit Charging Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Calibration Cup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Other Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Multi-Unit Charger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Belt Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

SDM-3R. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

RP-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

IrDA Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Chapter 3: Measuring Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Turning On the GX-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Performing a Demand Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Turning Off the GX-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Measuring Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Monitoring an Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Combustible Gas Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Responding to Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

GX-3R Operator’s Manual

Chapter 4: Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Tips for Using Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Peak Screen (PEAK). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

STEL Screen (STEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

TWA Screen (TWA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Changing the Combustible Gas Sensor’s Gas (LIST) . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Changing the User ID (USER ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Changing the Station ID (STN ID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Last Successful Calibration Date (CAL DATA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Last Successful Bump Test Date (BUMP DATA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Date, Time, and Temperature Screen (TEMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Viewing Alarm Settings Screen (ALARM--PT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Chapter 5: User Mode and Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Entering User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Tips for Using User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Performing a Bump Test (BUMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Performing a Calibration (GAS CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Setting Calibration Parameters (CAL SET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Setting Bump Test Parameters (BUMP SET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Alarm Settings (ALARM--PT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Updating the Lunch Break Setting (LUNCH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Setting the Confirmation Beep and Non-Compliance Indicator (BEEP) . . . . . . . . . . . . . 66

Updating the Backlight Time (BL TIME). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Turning the Key Tone On/Off (KEY TONE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Display Mode Items (DISP SET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Zero Suppression (ZERO SUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Zero Follower (ZERO.FLWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Setting the Date/Time (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Turning the Password On/Off (PASSWORD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Viewing the ROM/SUM (ROM/SUM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Entering Measuring Mode (START) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Chapter 6: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

Recharging the Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Replacing the Buzzer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Replacing the Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Replacing the Hydrophobic Dust Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Replacing a Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Chapter 7: General Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

GX-3R Operator’s Manual

Appendix A: Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Entering Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Tips for Using Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Performing a Calibration (GAS CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Performing a Gas Test (GAS TEST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Sensor/Battery Replacement Date (SEN DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Performing a Bump Test (BUMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Setting Alarms to Latching or Self-Resetting (LATCHING) . . . . . . . . . . . . . . . . . . . . . . 89

Turning the Demand Zero Function On/Off (DEM ZERO). . . . . . . . . . . . . . . . . . . . . . . 89

Turning the Auto Zero Function On/Off (AUTOZERO) . . . . . . . . . . . . . . . . . . . . . . . . . 90

Turning the ID Display Function On/Off (ID DISP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Turning the Zero Suppression On/Off (ZERO SUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Turning the Zero Follower On/Off (ZERO.FLWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

User Mode Zero Suppression (ZSUP.DISP). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

User Mode Zero Follower (ZFLW.DISP). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Setting the Date/Time (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Turning the Password On/Off (PASSWORD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Viewing the ROM/SUM (ROM/SUM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Performing a Default (M.DEFAULT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Entering Measuring Mode (START) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Appendix B: Gas Select Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Entering Gas Select Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Tips for Using Gas Select Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Changing the Gas Combination (GAS COMB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Saving the Alarm Points (SET R AP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Turning Calibration Max Span On/Off (MAX SPAN). . . . . . . . . . . . . . . . . . . . . . . . . . 102

Stealth and Vibrator Settings (STEALTH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

LEL Definition (CHG LEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Exiting Gas Select Mode (START). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

WARNING: Understand manual before operating. Substitution of components may

impair intrinsic safety. To prevent ignition of a hazardous atmosphere, batteries must only be changed or charged in an area known to be nonhazardous. Not tested in oxygen enriched atmospheres (above 21%).

GX-3R Operator’s Manual

Chapter 1: Introduction

Overview

This chapter briefly describes the GX-3R gas monitor. This chapter also describes the

GX-3R Operator’s Manual (this document). Table 1 at the end of this chapter lists the

specifications for the GX-3R.

About the GX-3R

Using an advanced detection system consisting of up to three gas sensors, the GX-3R personal four-gas monitor detects the presence of combustible gas, oxygen (O2), carbon

monoxide (CO), and hydrogen sulfide (H2S) simultaneously. The GX-3R’s compact size and easy-to-use design makes it ideally suited for a wide range of applications, including

sewage treatment plants, utility manholes, tunnels, hazardous waste sites, power stations, petrochemical refineries, mines, paper mills, drilling rigs, and fire fighting stations. The GX-3R offers a full range of features, including:

• Simultaneous monitoring of one to four gases

• Liquid crystal display (LCD) for complete and understandable information at a glance

• Ultrabright alarm LEDs

• Distinctive audible/vibrating alarms for dangerous gas conditions and audible alarms for unit malfunction

• Microprocessor control for reliability, ease of use, and advanced capabilities

• Data logging functions

• Alarm trend data

• STEL, TWA, and over range alarms

• Peak readings

• Built-in time function

• Lunch break feature

• CSA “C/US” classification for Class I, Division I, Groups A, B, C, and D hazardous atmosphere (pending)

WARNING: The Model GX-3R detects oxygen deficiency, elevated levels of oxygen,

combustible gases, carbon monoxide, and hydrogen sulfide, all of which can be dangerous or life threatening. When using the GX-3R, you must follow the in stru cti ons an d w arnin gs in th is m anual to as sure proper and safe operation of the unit and to minimize the risk of personal injury. Be sure to maintain and periodically calibrate the GX-3R as described in this manual.

6 • Chapter 1: Introduction GX-3R Operator’s Manual

Specifications

Table 1: Standard Sensor Specifications/Alarm Points

Combustible Gas,

Methane (CH

) Cali-

Oxygen (O

)Hydrogen

Sulfide (H

Carbon

Monoxide (CO)

bration Standard*

Detection Range 0 - 100% LEL 0 - 25% volume 0 - 100.0 ppm 0 - 500 ppm

Service Range n/a 25.1 - 40% volume 100.1 - 200.0 ppm 501 - 2,000 ppm

Reading

1% LEL 0.1% volume 0.1 ppm 1 ppm

Increment

War nin g

Factory Setting

Alarm

Factory Setting

Alarm H

Factory Setting

10% LEL** 19.5% volume,

decreasing**

25% LEL 18.0% volume,

decreasing

50% LEL 23.5% volume,

increasing

5.0 ppm** 25 ppm**

30.0 ppm 50 ppm

100.0 ppm 1200 ppm

STEL Alarm n/a n/a 5.0 ppm 200 ppm

TWA Alarm n/a n/a 1.0 ppm 25 ppm

* The GX-3R is a l s o av ai lab l e se t up for general hydroc a r bo ns an d calibrated to a combustible gas other than methane, such

as isobutane. Consult RKI Instruments, Inc. for further information.

Table 2: GX-3R Specifications

Sampling

Method

Response Time T90 within 30 seconds

Display Graphics LCD Display

Operating

Temperature &

Continuous environment: -20°C to 50 Temporary environment (up to 15 minutes): -40°C to 60

Humidity

Indication

Accuracy for

Detection

Range

Combustible Gas, Catalytic Type Sensor

• ± 5% of reading or ± 2% LEL (whichever is greater)

Oxygen

• ± 0.5% O

Hydrogen Sulfide

• ± 5% of reading or ± 2 ppm H

S (whichever is greater)

Carbon Monoxide

• ± 5% of reading or ± 5 ppm CO (whichever is greater)

Indication

Accuracy for

Service Range

Oxygen

• ± 3.0% O

Hydrogen Sulfide and Carbon Monoxide

• ± 20% of reading

Diffusion

C/Below 90% RH

C/Below 95% RH

GX-3R Operator’s Manual Chapter 1: Introduction • 7

Safety/

Regulatory

Power Supply Lithium ion battery pack

• ATEX: II 1 G Ex da ia IIC T4 Ga Certificate Number: DEKRA 17ATEX0103 X

• IECEx: Ex da ia IIC T4 Ga Certificate Number: IECEx DEK 17.0050X

• CSA classified, “C/US”, as Intrinsically Safe. Exia. Class I, Groups A, B, C, & D. Temperature Code T3A. (pending)

C US

186718

Continuous

Operating

Hours

@ 25 °C

Case High-impact Plastic, RF Shielded, Dust and Weather Proof (IP66/68)

Included

Accessories

Other

Accessories

Dimensions and

Wei gh t

25 hours in Measuring Mode (Non Alarm Operation, Fully Charged)

• Alligator clip

• Rubber boot

•Wrist strap

• Calibration cup

• Single-unit charger cable

• Multi-unit charger cable

• Belt clip

•SDM-3R

•RP-3R

• IrDA/USB Cable for connecting to a computer when using the Data Logger Management Program (not needed if computer has an infrared port)

Approximately 65(H) x 58(W) x 26(D) mm (2.6”H x 2.3”W x 1.0”D)

Approximately 100 g (3.5 oz.)

About this Manual

The GX-3R Operator’s Manual uses the following conventions for notes, cautions, and

warnings.

NOTE: Describes additional or critical information.

CAUTION: Describes potential damage to equipment. WARNING: Describes potential danger that can result in injury or death.

8 • Chapter 1: Introduction GX-3R Operator’s Manual

Chapter 2: Description

GX-3R

POWER

MODE

CO/H2SLELO2

AIR

Bottom Cover

Charging Socket

Sensor

Retainer

Buzzer

Opening

Front Back

LCDLEDs

Threaded

Inserts

Overview

This chapter describes the GX-3R instrument and its accessories.

Instrument Description

Figure 1: Component Location

Case

The GX-3R’s sturdy, high-impact plastic case is radio frequency (RF) resistant and is suitable for use in many environmental conditions, indoors and out. The case is dust proof and water resistant. A clear plastic window is located on the front of the case for viewing the LCD. The black bottom cover is located on the bottom of the case and allows access to the filters and sensors. A sensor retainer and filter gasket help orient and retain the sensor and filters.

Three threaded inserts on the back of the case allow for installation of an alligator clip or belt clip.

LCD

The digital LCD (liquid crystal display) simultaneously shows the gas reading for all installed sensors. The LCD also shows information for each of the GX-3R’s operating modes.

GX-3R Operator’s Manual Chapter 2: Description • 9

Control Buttons

Two control buttons, AIR and POWER MODE, are located below the LCD.

Table 3: GX-3R Control Button Functions

Button Function(s)

AIR • turns on LCD backlight

• resets alarm condition if LATCHING is set to ON in Maintenance Mode

• enters User Mode, Maintenance Mode, and Gas Select Mode when used with POWER MODE button

• activates the demand zero function (adjusts the GX-3R’s fresh air reading)

• changes the value of a parameter available for adjustment

• scrolls through parameter options

POWER MODE • turns the GX-3R on and off

• turns on LCD backlight

• enters and scrolls through Display Mode

• enters instructions into the GX-3R’s microprocessor

• resets alarm condition if LATCHING is set to ON in Maintenance Mode

• enters User Mode, Maintenance Mode, and Gas Select Mode when used with AIR button

Alarm LEDs

The six alarm LEDs around the edge of the case alert you to gas, low battery, and failure alarms.

Buzzer

One solid-state electronic buzzer is located inside the case. A hole in the middle front of the case allow the sound to exit the case. The buzzer sounds for gas alarms, malfunctions, low battery voltage, and as an indicator during use of the GX-3R’s many display and adjustment options.

Vibrator

A vibrating motor inside the GX-3R case vibrates for gas alarms, unit malfunctions, and as an indicator during normal use of the various modes of the GX-3R.

NOTE: If STEALTH is set to ON, the vibrator only functions when VIB in the

STEALTH Gas Select Mode item is set to ON. See “Stealth and Vibrator

Settings (STEALTH)” on page 102.

Sensors

The GX-3R uses three sensors to monitor combustible gas, oxygen (O2), carbon monoxide (CO), and hydrogen sulfide (H2S) simultaneously. The sensors are located inside the GX-3R and are held in their sockets by the sensor retainer and bottom cover. The sensors

use different detection principles, as described below.

Combustible Gas Sensor

The combustible gas sensor detects combustible gas in the %LEL range. It uses a catalytic element for detection. The reaction of gas with oxygen on the catalyst causes a change in the resistance of the element which affects the current flowing through it. The current is amplified by the GX-3R’s circuitry, converted to a measurement of combustible gas concentration, and displayed on the LCD.

10 • Chapter 2: Description GX-3R Operator’s Manual

The standard calibration for the combustible gas sensor is to methane but the sensor will still detect and respond to a variety of combustible gases.

O2/CO/H2S Sensors

The O2, CO, and H2S sensors are electrochemical cells that consist of two precious metal electrodes in a dilute acid electrolyte. A gas permeable membrane covers the sensor face

and allows gas to diffuse into the electrolyte. The gas reacts in the sensor and produces a current proportional to the concentration of the target gas. The current is amplified by the GX-3R’s circuitry, converted to a measurement of gas concentration, and displayed on the LCD.

There are 4 different types of CO and H2S sensors available:

• CO only (ESR-A13P): A single electrochemical cell that detects CO. Instruments with this sensor cannot detect H2S.

•H2 compensated CO (ESR-A1CP): A single electrochemical cell that detects CO. This sensor does not respond to or responds minimally to hydrogen. Instruments with this

sensor cannot detect H

•H

S only (ESR-A13i): A single electrochemical cell that detects H2S. Instruments

with this sensor cannot detect CO.

•CO/H2S (ESR-A1DR): A combination electrochemical cell that detects both CO and H2S.

Dummy Sensors

Any unit that has less than 3 sensors will have a dummy sensor installed in one or more unused sensor positions. Dummy sensors are factory installed. The flat side of the dummy sensor should face away from the GX-3R and the hollow side should face toward the GX-3R.

Filters

H2S Removal Filter Disk (Dark Red)

An H2S removal filter disk is placed into a recess in the filter gasket over the combustible gas sensor. It prolongs the life of the sensor by preventing H2S in the ambient air from reaching the combustible gas sensor. The H2S filter disk is dark red in color and although it may darken over time, its color is not indicative of remaining filter life.

The H2S filter disk can absorb H2S for 33 ppm hours and should be replaced after that much exposure. With this many ppm hours of absorption, the H replaced after 80 minutes of exposure to 25 ppm H2S. This equates to replacing the H2S filter disk after 40 2-minute calibrations with a cylinder containing 25 ppm H2S. If H2S exists in the monitoring environment, the H2S filter disk will have to be replaced more frequently.

S filter disk should be

Charcoal Filter (Black)

A black charcoal filter is placed into a recess in the filter gasket over the CO sensor. The charcoal filter disk scrubs H2S and certain hydrocarbons out of the sample to avoid false

CO readings. If false or elevated CO readings are noticed, especially in the presence of H

S, change the charcoal filter.

If your instrument has a combo CO/H2S sensor, it will have a filter installed that is half

GX-3R Operator’s Manual Chapter 2: Description • 11

black charcoal filter and half white humidity filter.

Humidity Filter (White)

A white humidity filter covers the H2S sensor.

If your instrument has a combo CO/H2S sensor, it will have a filter installed that is half black charcoal filter and half white humidity filter.

Hydrophobic Dust Filter

The oval-shaped hydrophobic dust filter sits on the filter gasket, covering the sensor ports and the filters.

Infrared Communications Port

An infrared (IR) communications port is located on the top of the case, near the top LEDs. The data transmitted through the port is in standard IrDA protocol. A computer’s infrared port or an IrDA/USB cable connected to a USB port can be used to download data saved by the GX-3R to a computer using the GX-3R Data Logger Management Program. See the GX-3R Data Logger Management Program operator’s manual for data logging and downloading instructions.

Charging Socket and Battery Pack

A charging socket on the back of the instrument allows for charging cable connection.

A lithium ion (Li-ion) battery pack powers the GX-3R. At 25°C the battery lasts at least 25 hours. The battery icon in the upper right of the LCD shows remaining battery life.

When the GX-3R detects a low battery voltage, a low battery warning is activated. When battery voltage is too low for Measuring Mode, the GX-3R sounds a dead battery alarm.

The battery pack can be recharged by using the GX-3R charging cable. The battery pack is not user-replaceable.

NOTE: Use of batteries or battery chargers not specified by RKI Instruments, Inc. will

compromise the CSA classification and may void the warranty. See “Recharging the Batteries” on page 74.

WARNING: To prevent ignition of a hazardous atmosphere, batteries must only be

changed or charged in an area known to be nonhazardous.

AVERTISSEMENT:Pour éviter l’inflammation d’une atmosphère dangereuse, les

batteries doivent uniquement être modifiés ou facturés dans une zone connue comme non dangereuse.

12 • Chapter 2: Description GX-3R Operator’s Manual

Included Accessories

Alligator Clip

AC Adapter

Charging Plug

Alligator Clip

An alligator clip is installed on the back of the GX-3R. The alligator clip can be used to attach the GX-3R to clothing or a belt. Teeth in the alligator clip’s jaws prevent the unit from slipping off. The alligator clip can be rotated to change how the instrument is

oriented when worn.

Figure 2: Alligator Clip

Rubber Boot

A black rubber boot is installed on the GX-3R.

Wrist Strap

A wrist strap is included with the GX-3R and can be attached to the wrist strap installation feature on the left side of the GX-3R’s case.

Single-Unit Charging Cable

The charging cable has an AC adapter on one end and a charging plug that connects to the GX-3R on the other end.

Figure 3: Charging Cable

GX-3R Operator’s Manual Chapter 2: Description • 13

Calibration Cup

FRONT

Use the calibration cup to apply gas during a bump test, calibration, or gas test. The calibration cup has an installation orientation to observe. “Front” and “rear” imprinting on the bottom of the cup correspond to the front and rear of the GX-3R Pro when the calibration cup is installed. In addition, a “front” label on the front of the calibration cup

should be visible when viewing the LCD with the calibration cup installed.

Other Accessories

Multi-Unit Charger

The multi-unit charger is a wall plug style adapter that plugs into a bar. The bar has five 4-foot cables coming out one side. The end of each of the five cables has a plug that connects to the GX-3R’s power jack. The AC adapter is rated 100 - 240 VAC input, 5.99 VDC output.

Figure 4: Calibration Cup

Belt Clip

A belt clip makes it easy to hook the GX-3R to a utility belt.

SDM-3R

The SDM-3R is a calibration station for the GX-3R and GX-3R Pro. The station’s buttons can be used for operations (Standalone Mode) or a computer can be used to control the docking station (PC Controlled Mode). See the appropriate SDM-3R manual for more information.

RP-3R

The RP-3R is a pump that allows sample to be drawn to the GX-3R.

IrDA Cable

Unless your computer has a built-in IrDA port, an IrDA cable is needed to establish communication between the GX-3R and the Datalogging Program or the User Setup Program.

14 • Chapter 2: Description GX-3R Operator’s Manual

Chapter 3: Measuring Mode

RESUME

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SEC

Overview

This chapter explains how to use the GX-3R to perform confined space entry monitoring or general area monitoring in Measuring Mode. Display Mode is accessed from Measuring Mode by pressing POWER MODE and is described in “Chapter 4: Display Mode” on page 29.

Start Up

This section explains how to start up the GX-3R, get it ready for operation, and turn it off.

NOTE: The screens illustrated in this section are for a standard 4-gas unit. The screens

displayed by your GX-3R may be slightly different.

Turning On the GX-3R

To illustrate certain functions, the following description of the GX-3R start up sequence assumes that the following menu items in User Mode are turned on: LUNCH, CAL RMDR, and BUMP.RMDR in User Mode, and ID DISP and AUTOZERO in Maintenance Mode. If any of these items are turned off, then the corresponding screens will not appear.

1 . Press and briefly hold down POWER MODE. Release the button when you hear a

beep.

2 . If LUNCH is set to ON (factory setting if OFF, see “Updating the Lunch Break

Setting (LUNCH)” on page 65), the Lunch Break Screen appears. The unit counts down from 5 seconds.

a. Continue Accumulating

average (TWA) readings from the last time the GX-3R was used, press and release POWER MODE or allow the countdown to reach 0. The short-term exposure limit (STEL) reading is reset each time the GX-3R is turned on.

b. Reset Accumulation: To reset the accumulation of peak and time-weighted

average (TWA) readings, press and release AIR before the countdown reaches 0.

: To continue accumulating peak and time-weighted

GX-3R Operator’s Manual Chapter 3: Measuring Mode • 15

3 . If CAL RMDR is set to ON (factory setting) and a calibration is due, the screen that

CAL--LMT

7:49

CAL

CAL--LMT

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FAIL

NEXT CAL

7:49

0 d

appears next depends on how CAL EXPD is set in User Mode (see “CAL EXPD” on page 57). The three possible screens are described below. If a calibration is not due, the instrument will tell you how many days are left until a calibration is due.

CAL EXPD set to

CONFIRM (factory setting)

LCD

Sound Buzzer sounds double pulsing tone Buzzer sounds double pulsing

tone

Action • Option A, Perform calibration

Press and release POWER MODE to enter User Mode to perform a calibration. See “Performing a Calibration (GAS CAL)” on page 47 for calibration instructions.

If the calibration was success-

ful, the screen above will not appear again until the unit is due

for calibration. If the calibra-

tion was not successful, the screen above will again appear in the startup sequence.

• Option B, Bypass message continue without performing a calibration, press and release AIR.

: To

The GX-3R cannot be used until a successful calibration has been performed. Press and release POWER MODE to enter User Mode and perform a calibration. See “Performing a Calibration

(GAS CAL)” on page 47 for cali-

bration instructions.

If the calibration was successful, the screen above will not appear

again until the unit is due for cali-

bration. If the calibration was not successful, the screen above will again appear in the startup sequence.

CAL EXPD set to

CANT USE

CAL EXPD set to

NONE

None

• Option A, Perform calibration If you want to enter User Mode to perform a calibration, press and release POWER MODE.

• Option B, Bypass message continue without performing a calibration, wait a few seconds for the instrument to continue with its startup sequence.

: To

16 • Chapter 3: Measuring Mode GX-3R Operator’s Manual

4 . If BUMP.RMDR is set to ON (factory setting is OFF) and a bump test is due, the

BUMP--LMT

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CAL

BUMP--LMT

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FAIL

NEXT BP

7:49

0 d

7:49

18 - 12.22

screen that appears next depends on how BUMP.EXPD is set in User Mode (see “BUMP.EXPD” on page 61). The three possible screens are described below. If a bump test is not due, the instrument will tell you how many days are left until a bump test is due.

BUMP.EXPD set to

CONFIRM (factory setting)

LCD

Sound Buzzer sounds double pulsing

tone

Action • Option A, Perform bump test

Press and release POWER MODE to enter User Mode to perform a bump test. See “Performing a Bump Test (BUMP)” on page 43 for bump test instructions.

If the bump test was success-

ful, the screen above will not appear again until the unit is due for bump testing. If the bump test was not successful, the screen above will again appear in the startup sequence.

• Option B, Bypass message continue without performing a bump test, press and release AIR.

: To

BUMP.EXPD set to

CANT USE

Buzzer sounds double pulsing tone None

The GX-3R cannot be used until a

successful bump test has been per-

formed. Press and release POWER MODE to enter User Mode and

perform a bump test. See “Per-

forming a Bump Test (BUMP)” on page 43 for bump test instructions.

If the bump test was successful, the screen above will not appear again

until the unit is due for bump testing. If the bump test was not suc-

cessful, the screen above will again appear in the startup sequence.

BUMP.EXPD set to

NONE

• Option A, Perform bump test If you want to enter User Mode to perform a bump test, press and release POWER MODE.

• Option B, Bypass message continue without performing a bump test, wait a few seconds for the instrument to continue with its startup sequence.

: To

5 . The Date/Time Screen appears for a few seconds.

GX-3R Operator’s Manual Chapter 3: Measuring Mode • 17

6 . The Battery Voltage Screen appears for a few seconds.

AL - L V

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3.8

bAtt