RKI Instruments GX-2012 User Manual

Download

GX-2012

Operator’s Manual

Part Number: 71-0239RK

Revision: H

Released: 3/17/14

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 you have and the sensor types. Typical calibration frequencies for most applications are between 1 and 3 months, but can be required more often or less often based on your usage.

GX-2012 Operator’s Manual

Warranty

RKI Instruments, Inc. warrants the GX-2012 sold by us to be free from defects in materials, workmanship, and performance for a period of two years from the date of shipment from RKI Instruments, Inc. This includes the instrument and the original sensors. Replacement parts are warranted for 1 year from the date of their shipment from RKI Instruments, Inc. except for replacement sensors which are warranted for 2 years. Any parts found defective within their warranty period will be repaired or replaced, at our option, free of charge. This warranty does not apply to those items which by their nature are subject to deterioration or consumption in normal service, and which must be cleaned, repaired, or replaced on a routine basis. Examples of such items are:

Absorbent cartridges

Filter elements, disks, or sheets

Pump diaphragms and valves

Warranty is voided by abuse including mechanical damage, alteration, rough handling, or repair procedures not in accordance with the instruction manual. This warranty indicates the full extent of our liability, and we are not responsible for removal or replacement costs, local repair costs, transportation costs, or contingent expenses incurred without our prior approval.

THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND

REPRESENTATIONS, EXPRESSED OR IMPLIED, AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF RKI INSTRUMENTS, INC. INCLUDING BUT NOT LIMITED TO THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL RKI INSTRUMENTS, INC. BE LIABLE FOR INDIRECT, INCIDENTAL, OR CONSEQUENTIAL LOSS OR DAMAGE OF ANY KIND CONNECTED WITH THE USE OF ITS PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR OPERATE PROPERLY.

This warranty covers instruments and parts sold to users only by authorized distributors, dealers, and representatives as appointed by RKI Instruments, Inc.

We do not assume indemnification for any accident or damage caused by the operation of this gas monitor and our warranty is limited to replacement of parts or our complete goods.

Warranty GX-2012 Operator’s Manual

Table of Contents

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

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

About the GX-2012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Instrument Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Printed Circuit Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Alarm LED Arrays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Infrared Communications Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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

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

Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Flow Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Sensors and Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Inlet Filter Holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Tapered Rubber Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Belt Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Wrist Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Sample Hose & 10 Inch Probe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Charging Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Optional Probes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Purge Tee Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

External Dilution Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

GX-2012 Operator’s Manual Table of Contents

Chapter 3: Using the GX-2012 in Normal Mode . . . . . . . . . . . . . . . 19

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Start Up, Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Turning On the GX-2012, Normal Mode Only . . . . . . . . . . . . . . . . . 19

Turning On the GX-2012 in Normal With All Modes Active . . . . . . . 25

Performing a Fresh Air Adjustment, Normal Mode . . . . . . . . . . . . . 27

Turning Off the GX-2012, Normal Mode. . . . . . . . . . . . . . . . . . . . . . 28

Measuring Mode, Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Monitoring an Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Using Optional Probes and Fittings . . . . . . . . . . . . . . . . . . . . . . . . . 29

Combustible Gas Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Snap Log Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Measuring Mode, Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Resetting and Silencing Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Responding to Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Inert Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Start Up and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

HC Range Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Peak Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

STEL Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

TWA Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Alarm Points Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Operation Time Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Date/Time Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Remaining Log Time Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Clear Data Logger Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Pump Off Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

User ID Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Station ID Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Snap Logging Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Peak Bar Select Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Datalogging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

SDM-2012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Calibration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Calibration/Bump Test Supplies and Equipment . . . . . . . . . . . . . . . . 57

Table of Contents GX-2012 Operator’s Manual

Preparing for Calibration or Bump Test . . . . . . . . . . . . . . . . . . . . . . 58

Calibrating the GX-2012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Bump Testing the GX-2012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Chapter 4: Using the GX-2012 in Bar Hole Mode . . . . . . . . . . . . . . 73

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

Start Up, Bar Hole Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Turning On the GX-2012, Bar Hole Mode . . . . . . . . . . . . . . . . . . . . 73

Performing a Fresh Air Adjustment, Bar Hole Mode . . . . . . . . . . . . 79

Bar Hole Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Performing a Bar Hole Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Turning Off the GX-2012, Bar Hole Mode . . . . . . . . . . . . . . . . . . . . 83

Chapter 5: Using the GX-2012 in Leak Check Mode . . . . . . . . . . . 84

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Start Up, Leak Check Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Turning on the GX-2012, Leak Check Mode . . . . . . . . . . . . . . . . . . . 84

Performing a Fresh Air Adjustment, Leak Check Mode . . . . . . . . . . 90

Leak Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Setting the Display Range Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Locating a Leak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Overscale Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Turning the Alarm On and Off in Leak Check Mode . . . . . . . . . . . . . 93

Peak Hold Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Snap Log Mode, Leak Check Mode Operation . . . . . . . . . . . . . . . . . 94

Viewing Snap Log Data in Leak Check Mode Operation . . . . . . . . . 97

Turning Off the GX-2012, Leak Check Mode . . . . . . . . . . . . . . . . . . 99

Chapter 6: Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Tips for Using Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Using Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Updating the Date and Time Settings . . . . . . . . . . . . . . . . . . . . . . . 103

Performing a Fresh Air Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . 103

Calibrating Using Auto Calibration . . . . . . . . . . . . . . . . . . . . . . . . 105

Calibration Using Single Calibration . . . . . . . . . . . . . . . . . . . . . . . 108

Performing a Bump Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Turning the Lunch Break Setting On or Off. . . . . . . . . . . . . . . . . . . 116

GX-2012 Operator’s Manual Table of Contents

Updating the Alarm Latching Settings . . . . . . . . . . . . . . . . . . . . . . 117

Updating the Alarm Silence Settings . . . . . . . . . . . . . . . . . . . . . . . . 118

Updating the Data Logging Interval . . . . . . . . . . . . . . . . . . . . . . . . 119

Updating the Alarm Point Settings . . . . . . . . . . . . . . . . . . . . . . . . . 120

Turning the Clear Data Logger Screen On or Off . . . . . . . . . . . . . . 124

Turning the Bump Test Function On or Off . . . . . . . . . . . . . . . . . . . 125

Turning the Pump Off Screen On or Off . . . . . . . . . . . . . . . . . . . . . 126

Updating the Bump Test Parameters . . . . . . . . . . . . . . . . . . . . . . . . 127

Updating the Confirmation Beep Setting. . . . . . . . . . . . . . . . . . . . . 129

Updating the DataLog Overwrite Setting . . . . . . . . . . . . . . . . . . . . 129

Updating the Calibration Interval . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Updating the Calibration Reminder Setting . . . . . . . . . . . . . . . . . . 130

Updating the Calibration Expired Action Setting . . . . . . . . . . . . . . 131

Updating the Calibration Check Setting . . . . . . . . . . . . . . . . . . . . . 131

Updating the Bump Test Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Updating the Bump Test Reminder Setting . . . . . . . . . . . . . . . . . . . 133

Updating the Bump Test Expired Action Setting . . . . . . . . . . . . . . . 133

Updating the Bump Test Check Setting . . . . . . . . . . . . . . . . . . . . . . 134

Turning the ID Display Function On or Off . . . . . . . . . . . . . . . . . . 135

Updating the LCD Backlight Time Setting . . . . . . . . . . . . . . . . . . . 135

Updating the Autozero Function . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Updating the Demand Zero Function . . . . . . . . . . . . . . . . . . . . . . . 136

Updating the Leak Check/Bar Hole Mode Setting. . . . . . . . . . . . . . 137

Updating the Bar Hole Sampling Time . . . . . . . . . . . . . . . . . . . . . . 138

Turning Portuguese On or Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Updating the Leak Check Mode CO Channel Display Setting . . . . 139

Viewing the ROM/SUM Information . . . . . . . . . . . . . . . . . . . . . . . . 140

Turning the Password Function On or Off . . . . . . . . . . . . . . . . . . . 141

Performing a Low Flow Setpoint Adjustment . . . . . . . . . . . . . . . . . 142

Exiting Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

Chapter 7: Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Replacing or Recharging the Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Replacing Alkaline Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Replacing the Lithium Ion Battery Pack . . . . . . . . . . . . . . . . . . . . . 147

Recharging the Lithium Ion Battery Pack in the Instrument . . . . . . 148

Table of Contents GX-2012 Operator’s Manual

Recharging the Lithium Ion Battery Pack Out of the Instrument . . 150

Replacing the LEL and CO Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Replacing a Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

Replacing the Hydrophobic Disk Filter, Cotton Filter,

and Wire Mesh Disk. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

Appendix A: Calibrating and Bump Testing

with a Sample Bag. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Calibration/Bump Test Supplies & Equipment . . . . . . . . . . . . . . . . . . . . . 161

Preparing for Calibration or Bump Testing . . . . . . . . . . . . . . . . . . . . . . . . 162

Calibrating the GX-2012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Calibrating with the Auto Calibration Method . . . . . . . . . . . . . . . . 165

Calibrating with the Single Calibration Method . . . . . . . . . . . . . . . 168

Bump Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

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-2012 Operator’s Manual Table of Contents

Chapter 1: Introduction

Overview

This chapter briefly describes the GX-2012. This chapter also describes the GX-2012 Operator’s Manual (this document). Table 1 at the end of this chapter lists the specifications for the GX-2012.

About the GX-2012

Using an advanced detection system consisting of up to five gas sensors, the GX-2012 sample draw gas monitor detects the presence of combustible gas, oxygen (O

simultaneously. The GX-2012’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-2012 offers a full range of features, including:

), carbon monoxide (CO), and hydrogen sulfide (H2S)

• Simultaneous four-gas monitoring of combustible gases, O (in Normal Mode)

• Choice of two operating modes: Normal Mode for typical confined space or area monitoring and Bar Hole Mode for checking of bar holes when searching for underground gas leaks

• Sample-drawing pump with up to 50-foot range

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

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

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

• Alarm trend data (when used in Normal Mode)

• Data logging functions (when used in Normal Mode)

• STEL/TWA (when used in Normal Mode) and over range alarm display

, CO, and H2S

• Peak hold and average readouts (when used in Normal Mode)

• Built-in time function

• RF shielded high impact plastic case

GX-2012 Operator’s Manual Overview • 1

• CSA classification pending for Class I, Division I, Groups A, B, C, and D hazardous atmospheres

WARNING: The GX-2012 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-2012, you must follow the instructions and warnings in this manual to assure proper and safe operation of the unit and to minimize the risk of personal injury. Be sure to maintain and periodically calibrate the GX2012 as described in this manual.

NOTE: ONLY THE COMBUSTIBLE GAS DETECTION PORTION OF

THIS INSTRUMENT HAS BEEN ASSESSED FOR PERFORMANCE.

2 • Abou t the GX-2012 GX-2012 Operator’s Manual

Specifications

Table 1: GX-2012 Specifications

Target Gas %LEL

Combustible

Gas

(Methane Calibration Standard)*

Range

(Increment)

Leak Check

Mode

Range

(Increment)

0-100% LEL

(1% LEL)

0-5,000 ppm

(100 ppm)

NOTE: Detection range is 0-5,000 ppm, but displayed range can be set to 0-500 ppm, 0-1000 ppm, 0-2000 ppm, or 0-5000 ppm.

Sampling

Method

Response

Time

% Volume

Combustible

Gas

Oxygen (O2) Hydrogen

Sulfide

(Methane

Calibration

Standard)

0 - 100% vol

(1% vol)

0-40.0% vol

(0.1 vol%)

0-100 ppm

(0.5 ppm)

N/A N/A N/A N/A

Sample Draw

T90 Within 30 Seconds

Carbon

Monoxide

(CO)

0-500 ppm

(1 ppm)

Accuracy ± 5% of reading

or ± 2% LEL

(whichever is

greater)

± 5% of

reading or

± 2% full

scale

± 0.5% O

(whichever

is greater)

Display Digital LCD Display

Gas Alarms

(Factory

Settings)

Alarm 1

10% LEL

None Alarm 1

19.5 vol%

(Decreasing)

Alarm 2

50% LEL

Alarm 2

23.5 vol%

(Increasing)

Operating

-20°C to 50

C/Below 85% RH (Without Condensation)

Temperature

& Humidity

± 5% of

reading or

± 2 ppm H

(whichever

is greater)

Alarm 1

5 ppm

Alarm 2

30 ppm

TWA

1 ppm

STEL

5 ppm

± 5% of

reading or

± 5 ppm

(whichever

is greater)

Alarm 1

25 ppm

Alarm 2

50 ppm

TWA

25 ppm

STEL

200 ppm

GX-2012 Operator’s Manual Specifications • 3

Safety/

Regulatory

C US

pending

CSA classified, “C/US”, as Intrinsically Safe. Exia. Class I,

Groups A, B, C, & D. Temperature Code T3C.

Power

Supply

Continuous

Operating

Hours

@ 25 °C

Case High-impact Plastic with protective rubber layer, RF Shielded, Dust and

Standard

Accessories

Optional

Accessories

• Three AA size alkaline batteries standard

• Lithium Ion Battery Pack (3.7 VDC Nominal) optional, Direct Charging

• Alkaline Batteries: 15 Hours (Non Alarm Operation, Fully Charged)

• Lithium Ion Battery Pack: 10 Hours (Non alarm Operation, Fully Charged)

Weather Proof

• 10 foot hose

• 10 inch probe

• Flexible 4 inch tapered rubber nozzle

• Rechargeable Lithium-Ion Battery Pack

• 115 VAC Charging Station

• 12 VDC Charging Station

• Data Logger Management Program

• IrDA/USB Cable for Downloading Data to a Computer With Data Logger Management Program Software (not needed if computer has an infrared port)

• SDM-2012 Automatic Calibration Station & Software

• Various Probes (see “Parts List” on page 177)

Dimensions

and Weight

*Some versions of the GX-2012 are available with the LEL sensor factory set for HC (general hydrocarbons) and calibrated to isobutane. Consult RKI Instruments, Inc. for further information.

Approximately 171(H) x 65(W) x 39(D) mm (5.6”H x 2.5”W x 1.5”D)

Approximately 310 g (11 oz.)

About this Manual

The GX-2012 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.

4 • Abou t this Manual GX-2012 Operator’s Manual

Chapter 2: Description

Overview

This chapter describes the GX-2012 instrument and accessories.

Instrument Description

The instrument includes the case, sensors, LCD, control buttons, printed circuit boards, alarm LED’s, infrared communication port, buzzer, vibrator, batteries, pump, flow chamber, and inlet filter holder.

Wrist Strap Installation Feature

Inlet Filter

Holder

Tapered Rubber Nozzle

Inlet Fitting

Exhaust

Buzzer

Opening

Alarm

LED

Arrays

DISPLAY

(ADJ)

AIR

POWER

ENTER

(SHIFT)

RESET

SI LENCE

Chamber

LCD

Control Buttons

IR Port (behind button label)

Flow

Battery Cov er (alkaline version)

Charging Contacts

Figure 1: Components of the GX-2012, Front & Back

GX-2012 Operator’s Manual Overview • 5

Rechargeable Version

Battery Pack

Release Latch

Figure 2: Components of the GX-2012, Bottom

Alkaline

Version

Battery Cover Release Knob

Case

The Model GX-2012’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 weather resistant. A rubber layer on the outside of the case protects it from scratches and impact damage.

A clear plastic window through which the LCD can be viewed is located on the front of the case. Four brass charging contacts that are used when the GX2012 is placed in the charging station are on the back of the case. Both the rechargeable and alkaline versions include a removable battery pack. The battery pack release latch is on the bottom. The alkaline battery version also includes a battery cover release knob. The battery pack and flow chamber are located on the back of the GX-2012. The inlet filter holder is located on the top of the GX-2012 case.

Sensors

The GX-2012 uses up to five sensors to monitor combustible gas, oxygen

), carbon monoxide (CO), and hydrogen sulfide (H2S) simultaneously.

The sensors are located inside the GX-2012 and are held in their sockets by the flow chamber. The sensors use different detection principles, as described below.

6 • Instrument Description GX-2012 Operator’s Manual

Combustible Gas Sensors

% LEL Sensor (NC-6264A)

The % LEL 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-2012’s circuitry, converted to a measurement of combustible gas concentration, and displayed on the LCD.

NOTE: The %LEL sensor cannot be used in instruments intended for Leak

Check Mode operation.

LEL/ppm Sensor (NC-6264ALB)

The LEL/ppm combustible sensor is a specialized version of the % LEL sensor. It is used instead of the % LEL sensor in instruments that are intended for use in Leak Check Mode. The LEL/ppm sensor can also be used for detection in Normal Mode.

%Volume Sensor (TE-7561)

The % volume sensor detects combustible gas in the % volume range. It uses a thermal conductivity (TC) element for detection. The presence of combustible gas cools the element causing a change in the resistance of the element which affects the current flowing through it. The current is amplified by the GX-2012’s circuitry, converted to a measurement of combustible gas concentration, and displayed on the LCD.

Oxygen Sensor

The O2 sensor is a galvanic type of sensor. A membrane covers the cell and allows gas to diffuse into the cell at a rate proportional to the partial pressure

of oxygen. The oxygen reacts in the cell and produces a voltage proportional to the concentration of oxygen. The voltage is measured by the GX-2012’s circuitry, converted to a measurement of gas concentration, and displayed on the LCD.

CO and H2S Sensors

The 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 GX2012’s circuitry, converted to a measurement of gas concentration, and displayed on the LCD.

GX-2012 Operator’s Manual Instrument Description • 7

Dummy Sensors

Any unit that has less than 5 sensors will have a dummy sensor installed in one or more sensor positions. Dummy sensors are factory installed. The flat top of the dummy sensor should face up and the bottom hollow side should face down. The unit shown below is a standard 4-sensor unit for LEL/O

S/CO and has a dummy sensor installed in the %volume combustible

sensor position.

Dummy Sensor

Top Flat

Side

Figure 3: Dummy Sensor

Bottom

Hollow Side

LCD

A digital LCD (liquid crystal display) is visible through a clear plastic window on the front of the case. The LCD display simultaneously shows the gas reading for all installed sensors. The display also shows information for each of the GX-2012’s program modes.

8 • Instrument Description GX-2012 Operator’s Manual

Control Buttons

Five control buttons are located below the LCD. They are arranged around a central button, the POWER ENTER button. The DISPLAY (ADJ) button is on the left, the RESET SILENCE button on the right, the AIRS button on the top, and the (SHIFT)T is on the bottom.

Table 2: GX-2012 Control Button Functions

Button Function(s)

POWER ENTER • turns the GX-2012 on and off.

• used during setup and calibration.

RESET SILENCE silences and resets audible alarm if the GX-2012 is programmed

for latching alarms and the alarm silence option is on

DISPLAY (ADJ) • activates Display Mode

• enters instructions into the GX-2012’s microprocessor

AIRS • activates the demand-zero function (automatically adjusts the

GX-2012 in fresh-air conditions)

• scrolls through the display and settings modes

(SHIFT)T • scrolls through the display and settings modes

• enters instructions into the GX-2012’s microprocessor

1 The GX-2012’s alarms are user-adjustable. See “Chapter 6: Maintenance Mode” on page 100.

Printed Circuit Boards

The GX-2012 printed circuit boards analyze, record, control, store, and display the information collected. The circuit boards are located inside the case. They are not user serviceable.

Alarm LED Arrays

Three red alarm LED (light emitting diode) arrays are visible through frosted plastic lenses in the case. One is on the top front, one on the left side, and one on the right side. The alarm LED arrays alert you to gas, low battery, and failure alarms.

Infrared Communications Port

An infrared (IR) communications port is located just below the RESET SILENCE button. The signal goes through the control button material. The data transmitted through the port is in standard IrDA protocol. A computer’s infrared port or an IrDA/USB cable connected to a computer’s USB port can be used to download data saved by the GX-2012 to a computer using the GX2012 Data Logger Management Program. See the GX-2012 Data Logger Management Program operator’s manual for data logging and downloading instructions.

GX-2012 Operator’s Manual Instrument Description • 9

Buzzer

One solid-state electronic buzzer is located inside the case. Holes on the top 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-2012’s many display and adjustment options.

Vibrator

A vibrating motor inside the GX-2012 case vibrates for gas alarms, unit malfunctions, and as an indicator during normal use of the various modes of the GX-2012.

Batteries

Three AA-size alkaline batteries (standard) or an optional rechargeable lithium ion battery pack (3.7 VDC) power the GX-2012. Instrument run time is dependent upon battery type. At 25°C the alkaline batteries last up to 15 hours and the lithium ion battery pack lasts up to 10 hours. The battery icon in the upper right of the LCD shows remaining battery life.

When the GX-2012 detects a low battery voltage, a low battery warning is activated. When battery voltage is too low for normal operation, the GX2012 sounds a dead battery alarm.

The alkaline batteries can be replaced by removing the battery cover on the back of the case. The lithium ion pack can be replaced by removing the entire battery pack. Push the battery pack latch on the bottom of the unit toward the front of the unit to release the pack.

The lithium ion battery pack can be recharged by placing the GX-2012 in its optional battery charging station or by placing the battery pack in the charging station.

NOTE: Use of batteries or battery chargers not specified by RKI

Instruments, Inc. will void the CSA classification and may void the warranty. See “Replacing or Recharging the Batteries” on page 146.

WARNING: To prevent ignition of a hazardous atmosphere, batteries

must only be changed or charged in an area known to be nonhazardous.

10 • Instrument Descript ion GX-2012 Operator’s Manual

Pump

A diaphragm pump inside the GX-2012 draws the sample to the sensors. It can draw sample from as far as 50 feet from the GX-2012. The pump is not user serviceable.

CAUTION: Sample hose lengths of more than 50 feet are not recommended

for the GX-2012 because of flow rate reduction.

Flow Chamber

The flow chamber is on the back of the GX-2012 and is held in place by three phillips screws. The flow chamber seals to the rubber sensor gasket which seals to the sensor faces inside the GX-2012 and routes flow from the pump to the sensors and to the exhaust port (also a part of the flow chamber).

Sensors and Filters

The sensors are located underneath the flow chamber and are only accessible if you remove the flow chamber and the sensor gasket.

An H the %LEL sensor. This filter darkens as it absorbs H

S removal filter disk is placed into a recess in the sensor gasket over

S and should be

replaced when it is a dark brown color. Check the condition of this filter quarterly.

A charcoal filter is placed into a recess in the sensor gasket over the CO sensor. The charcoal filter is black, has a woven texture, and is impregnated with an H

S and certain hydrocarbon gases. The charcoal filter disk scrubs these

S absorbing material. The CO sensor will respond if exposed to

gases 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.

Inlet Filter Holder

The filter holder is a clear plastic dome shaped piece on the top of the case. A male quick connect fitting is located on the inlet filter holder. This is the GX2012’s inlet fitting. A cotton dust filter is inside the filter holder. The filter holder may be removed by turning it counterclockwise and pulling it away from the case. Two flat membrane disk hydrophobic filters, a wire mesh disk, and a rubber filter retaining gasket are held in place by the filter holder and are located in the bottom of the case chamber where the filter holder is installed.

GX-2012 Operator’s Manual Instrument Description • 11

Standard Accessories

The standard accessories include the tapered rubber nozzle, belt clip, sample hose, and 10 inch probe. An optional bar hole probe is also available and is described at the end of this section.

Tapered Rubber Nozzle

A cone shaped 4 inch long rubber nozzle is included with the GX-2012 as standard. It can be installed on the inlet fitting by pushing the larger end over it. The smaller end can be inserted through a hole in a wall or some other access to an enclosed area to sample the environment.

Belt Clip

A belt clip can be mounted to the back of the case using 3 phillips head screws. The belt clip allows the GX-2012 to be securely attached to a belt.

Wrist Strap

A wrist strap is included with the GX-2012 and can be attached to the right or left wrist strap installation feature.

Sample Hose & 10 Inch Probe

A 10 foot sample hose and a 10 inch probe are included as standard with the GX-2012. When desired, the rubber nozzle may be removed and the sample hose and 10 inch probe may be connected to the inlet fitting. Sample hose lengths are available from 10 feet to 50 feet (see “Parts List” on page 158). The quick connect end of the sample hose connects to the inlet fitting of the GX-2012 and the probe screws onto the end of the hose with the threaded fitting.

CAUTION: Sample hose lengths of more than 50 feet are not recommended

for the GX-2012 because of flow rate reduction.

Sample Hose

Probe

Figure 4: Sample Hose and Probe

12 • Standard Accessories GX-2012 Operator’s Manual

Optional Accessories

Several optional accessories are available for the GX-2012. They include a rechargeable lithium ion battery pack, charging stations, various special probes, a purge tee fitting, and a dilution fitting. The most commonly used optional accessories are described below. Detailed instructions regarding the use of these and other available accessories are included in other parts of this manual. Data logging accessories are briefly described in “Data Logging” on page 56.

Rechargeable Lithium Ion Battery Pack

A rechargeable lithium ion battery pack is available for the GX-2012. A fully charged battery pack will power the GX-2012 for 10 hours. The batteries will last for a minimum of 500 charge cycles. See the “Parts List” on page 158 for ordering information.

Charging Stations

The GX-2012 lithium ion battery pack is charged with the GX-2012 charging station. Two battery charging stations are available for the GX-2012, the standard AC charging station, and a DC charging station with a vehicle plug adapter.

GX-2012 Operator’s Manual Optional Accessories • 13

AC Powered Charging Station

The standard AC powered charging station consists of an instrument charging base and an AC adapter. The AC adapter plugs into a 115 VAC wall outlet and connects to the charging station with a jack on the end of a five foot DC output cable. The AC adapter will also work for 100 VAC or 220 VAC if an appropriate plug adapter is provided. The AC charging station is shown below in Figure 5.

AC Adapter

Adapter Jack

Figure 5: GX-2012 AC Powered Charging Station

To AC

Outlet

Charge LED

Adapter Jack

ViewRear View

Top

Charging Contacts

14 • Optional Accessorie s GX-2012 Operator’s Manual

DC Powered Charging Station

An optional DC powered charging station is available with a vehicle plug 12 VDC adapter. It uses the same charging base as the AC charging station but comes with a velcro strap to secure the GX-2012 in the charging base.

Adapter Jack

Rear View

To Vehicle

12 VDC

Power Socket

Adapter Jack

Vehicle Plug

Top

Chargi ng Contacts

Charge LED

View

Figure 6: GX-2012 DC Powered Charging Station

GX-2012 Operator’s Manual Optional Accessories • 15

Optional Probes

Various optional probes designed for specific applications are available for the GX-2012. They include the following:

• 30 inch aluminum probe

Figure 7: 30 Inch Aluminum Probe

This probe is designed for applications where it is necessary to put the probe tip in areas that are out of reach with the standard probe. A small breather hole near the end of the probe tube prevents interruption of sampling and a low flow alarm if the probe tip is blocked.

• 30 inch stainless steel probe

Figure 8: 30 Inch Stainless Steel Probe

This probe is physically the same as the 30 inch aluminum probe and is intended for applications where a high level of corrosion resistance is required in the long probe tube.

• Barhole probe

End Plugged

Figure 9: Barhole Probe

An optional bar hole probe is available for the GX-2012. It is designed to be used when the GX-2012 is operated in Bar Hole Mode to check bar holes when tracking down underground gas pipe leaks (see “Chapter 4: Using the GX-2012 in Bar Hole Mode” on page 73). The bar hole probe has the same handle as the standard probe, but has a 30 inch fiberglass tube instead of the standard tube. Four holes are drilled through the 30 inch tube’s wall near the end and the end is plugged so that debris from the barhole cannot be drawn into the tube. The sample is drawn through the drilled holes in the tube wall.

16 • Optional Accessorie s GX-2012 Operator’s Manual

• 32 inch telescoping probe with dust filter

Figure 10: 32 Inch Telescoping Probe with Dust Filter

This probe is designed for use where it is necessary to put the probe tip in areas not accessible with the 10 inch probe with dust filter and applications where the probe tube must be collapsible for storage.

• 7 foot telescoping probe with dust filter

Figure 11: 7 Foot Telescoping Probe with Dust Filter

This probe is designed for use where it is necessary to put the probe tip in areas not accessible with the 32 inch telescoping probe with dust filter and applications where the probe tube must be collapsible for storage.

• 8 meter hose with floating head

This probe is designed to be used in a tank or a well that may have water or some other liquid at the bottom. As you lower the probe down, if it hits water, it will float and continue to monitor the area.

See the “Parts List” on page 158 for probe ordering information.

GX-2012 Operator’s Manual Optional Accessories • 17

Purge Tee Fitting

The 17-4430RK-01 purge fitting is used to detect gas levels in a pressurized gas stream from a pipeline or vessel being purged. The sample port of the purge fitting is inserted into the flowing gas, and the vent port will allow any excess gas to release to the atmosphere to avoid damage to pump or sensors.

Pressurized

Stream

Sample Port

GX-2012 Inlet

Figure 12: Purge Tee Fitting

Vent Port

Excess Pressurized Sample

External Dilution Fitting

An external dilution fitting is available for the GX-2012. It is a 1:1 dilution fitting and is designed to mate with the inlet fitting and accept a sample hose or probe. The fittings are made with brass and nickel plated brass and are appropriate for use with the four standard gases. The dilution fitting is normally used when it is necessary to introduce air into a sample that has no oxygen or a very low level of oxygen, such as a nitrogen purged sample. It can also be used when one of the target gas levels in the sample area will likely be present in a concentration above the detection range for that gas. Since the fittings partially consist of unplated brass, they are not appropriate for detection of elevated levels of H

Figure 13: Dilution Fitting

18 • Optional Accessorie s GX-2012 Operator’s Manual

Chapter 3: Using the GX-2012 in Normal Mode

Overview

This chapter explains how to operate the GX-2012 in Normal Mode. Normal Mode is used to perform confined space entry monitoring or general area monitoring. While in Normal Mode, Display Mode and Calibration Mode are accessible.

If a standard version of the GX-2012 is ordered, it is shipped with Bar Hole Mode disabled so that the instrument only runs in Normal Mode when turned on.

Start Up, Normal Mode

This section explains how to start up the GX-2012 in Normal Mode, get it ready for operation, and turn it off.

NOTE: The screens illustrated in this section are for a 4-gas unit that has the

% LEL range for the combustible gas channel. The screens displayed by your GX-2012 may be slightly different.

Turning On the GX-2012, Normal Mode Only

The following description of the GX-2012 start up sequence assumes that the following items in Maintenance Mode are turned on: LNCH BRK, ID DISP, CL RMNDR, and BP RMNDR. If any of these items is turned off, then the corresponding screen will not appear. This description also assumes that Bar Hole Mode is not active.

1. Connect the tapered rubber nozzle or the sample hose to the GX-2012’s quick connect inlet fitting.

2. If a sample hose is used, screw the probe onto the sample hose’s threaded fitting.

3. Press and briefly hold down the POWER ENTER button. Release the button when you hear a beep.

GX-2012 Operator’s Manual Overview • 19

4. If LNCH BRK is turned on, the Resume Datalog Screen displays.

rESU

RESUME

• Press and release the POWER ENTER button to continue

accumulating time-weighted average (TWA), PEAK readings, and time in operation from the last time the GX-2012 was used. The short-term exposure limit [STEL] reading is reset each time the GX2012 is turned on.

• Press and release the DISPLAY(ADJ) button to reset the

accumulation of these measurements.

If you do not press the POWER ENTER or DISPLAY(ADJ) button within 5 seconds, the GX-2012 automatically resumes accumulating the TWA, PEAK readings, and time in operation.

5. If CL RMNDR is turned on (factory setting), the screen that appears next depends on how CL EXPRD is set in the Maintenance Mode Menu (page 131).

• If the unit is due for calibration and CL EXPRD is set to CONFIRM

(factory setting), then the following screen displays.

CAL

C--LIMIT

The alarm LED’s and buzzer will pulse several times. After this, press the RESET SILENCE button until you hear a beep to continue.

20 • Start Up, Normal Mode GX-2012 Operator’s Manual

• If the unit is due for calibration and CL EXPRD is set to NOT USE,

then the following screen displays.

FAIL

C--LIMIT

The GX-2012 cannot be used until a calibration has been performed either by selecting AUTO CAL or ONE CAL in the Maintenance Mode menu. See “Calibrating Using Auto Calibration” on page 105 or “Calibrating Using Single Calibration” on page 108 for calibration instructions.

• If calibration is not due or CL EXPRD is set to NO EFFECT, then

the following screen appears for a few seconds indicating when the next calibration is due.

2011 9 30 69d

NEXT CAL

6. If BP RMNDR is turned on (factory setting is OFF), the screen that appears next depends on how BP EXPRD is set in the Maintenance Mode Menu (page 131).

• If the unit is due for a bump test and BP EXPRD is set to CONFIRM

(factory setting), then the following screen displays.

tESt

B--LIMIT

The alarm LED’s and buzzer will pulse several times. After this, press the RESET SILENCE button until you hear a beep to continue.

GX-2012 Operator’s Manual Start Up, Normal Mode • 21

• If the unit is due for a bump test and BP EXPRD is set to NOT USE,

then the following screen displays.

FAIL

B--LIMIT

The GX-2012 cannot be used until a bump test has been performed by selecting BUMP in the Maintenance Mode menu. See “Performing a Bump Test” on page 111 for bump testing instructions.

• If a bump test is not due or BP EXPRD is set to NO EFFECT, then

the following screen appears for a few seconds indicating when the next bump test is due.

2011 9

30 10d

NEXTBUMP

NOTE: If both CL RMNDR and BP RMNDR are turned off, a WARM UP

screen will display before the warm up sequence continues.

22 • Start Up, Normal Mode GX-2012 Operator’s Manual

7. If ID DISP is turned on (see page 135), the User ID Screen displays for a few seconds and then the Station ID Screen displays for a few seconds.

U Id

- - - - - - - -

S Id

- - - - - - - -

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

2011 8 31 22:39

DATE

This screen displays the current year, month, day, and time.

GX-2012 Operator’s Manual Start Up, Normal Mode • 23

9. The Battery Level and Alarm Pattern Screen appears next.

bAtt

3.7

AL-H V

AL -- H indicates latching (hold) alarms and AL -- A indicates selfresetting (automatic) alarms. The number shown indicates the voltage of the batteries. A fully charged lithium ion battery pack will display 3.7 V. If the unit is powered by alkaline (dry cell) batteries, a “D” will appear in front of the “V” in the lower right corner.

bAtt

3.7

AL-H D: V

10. The display then indicates the following items for about a second each:

• Full scale values for all channels

• Warning setpoint (low gas alarm) for all channels

• Alarm setpoint (high gas alarm) for all channels

• STEL alarm setpoint for the CO and H

• TWA alarm setpoint for the CO and H

NOTE: If the combustible channel is factory set as %volume only, all gas

alarms are turned off. You must press and release the RESET SILENCE button at the warning, alarm, STEL, and TWA screens to acknowledge that there are no gas alarms. The warm up will not proceed until you do so.

S channels

If the combustible channel is set up as %volume only using the HC Range Screen in Display Mode, it will automatically revert to Autoranging when it is turned off and on again and the no alarm acknowledgement screen will not appear.

24 • Start Up, Normal Mode GX-2012 Operator’s Manual

11. If the GX-2012 experiences a sensor failure during start up, a screen indicating which sensor failed displays. In the example below, the CO sensor has failed.

FAIL

SENSOR

If you wish to continue, press and release the RESET SILENCE button to acknowledge the failure. The gas reading for the failed sensor will be replaced by “---”. Replace the failed sensor as soon as possible.

12. The GX-2012 is now operating in Normal Mode and monitoring for gas in Measuring Mode. The Normal Operation Screen appears.

ppm

CH4

H2S

22:37

20.9 0

0.0

%LEL

ppm

The concentrations of the target gases are displayed along with the time and battery charge level. The heart symbol displayed just to the left of the battery charge level flashes while the instrument is functioning properly. If it disappears or is steadily on, the unit is experiencing a microprocessor error. The fan symbol just to the left of the heart symbol spins while the pump is operating.

Turning On the GX-2012 in Normal Mode With All Modes Active

If the L./B. MODE item in Maintenance Mode is set to LC, bH, or LC bH (see “Updating the Leak Check/Bar Hole Mode Setting” on page 137), then the user must select Normal Mode during the start up sequence to operate in Normal Mode. The standard factory setting for L./B. MODE is OFF. See “Chapter 4: Using the GX-2012 in Bar Hole Mode” on page 73 for a description of Bar Hole Mode or “Chapter 5: Using the GX-2012 in Leak Check Mode” on page 84 for a description of Leak Check Mode.

The following description of the GX-2012 start up sequence assumes that the following menu items in Maintenance Mode are turned on: LNCH BRK, ID

GX-2012 Operator’s Manual Start Up, Normal Mode • 25

DISP, CL RMNDR, and BP RMNDR. If any of these items is turned off, then the corresponding screen will not appear. It also assumes that the L./B. MODE menu item in Maintenance Mode is set to LC bH. If L./B. MODE is set to LC, the Bar Hole Mode Select Screen will not appear. If L./B. MODE is set to bH, the Leak Check Mode Select Screen will not appear.

1. Connect the tapered rubber nozzle or the sample hose to the GX-2012’s quick connect inlet fitting.

2. If a sample hose is used, screw the probe onto the sample hose’s threaded fitting.

3. Press and briefly hold down the POWER ENTER button. The Normal Mode Select Screen displays.

vol%

CH4

H2S

NORMAL ?

20.9 0

0.0

%LEL

ppm

4. You can use the AIRS button to scroll to the Bar Hole Mode Select Screen.

BAR HOLE MODE

CH4

20.9

B.H. MODE?

vol% %LEL

sec

5. Press the AIRS button again to display the Leak Check Mode Select

Screen.

LEAK CK MODE

CH4

L.C. MODE?

5000

ppm

LEAK CK MODE

CH4

L.C. MODE?

5000

ppm

CO DISP OFF CO DISP On

26 • Start Up, Normal Mode GX-2012 Operator’s Manual

NOTE: If the CO DISP parameter in Maintenance Mode is set to On, the

CO channel will appear in Leak Check Mode. If the CO DISP parameter is set to OFF (factory setting), the CO channel will not appear in Leak Check Mode. See “Chapter 5: Using the GX-2012 in Leak Check Mode” on page 84 for more information.

You can scroll up or down through these screens using the AIRS or (SHIFT)T buttons.

6. With the Normal Mode Select Screen displayed, press and release the POWER ENTER button and continue with the startup sequence as described in the previous section, “Turning On the GX-2012, Normal Mode Only”, from step 4 on page 20 on.

NOTE: If no button is pressed for 20 seconds, the unit will proceed into

whichever mode is displayed.

7. To exit Normal Mode and return to the Mode Select Screen, press and hold the (SHIFT)T button for 5 seconds while in the Normal Operation Screen.

Performing a Fresh Air Adjustment, Normal Mode

Before using the GX-2012, it is recommended to set the fresh air readings for the target gases by performing a fresh air adjustment. This will set the combustible gas, CO, and H

20.9%.

1. Find a fresh-air environment. This is an environment free of toxic or combustible gases and of normal oxygen content (20.9%).

2. Turn on the unit as described above in “Turning On the GX-2012, Normal Mode Only” or “Turning On the GX-2012 in Normal Mode With All Modes Active”.

3. Press and hold the AIRS button. The display prompts you to hold the AIRS button.

S channels to zero and the OXY channel to

AIr CAL

HOLD AIR

4. Continue to hold the AIRS button until the display prompts you to release the AIRS button. The GX-2012 will count down from 8 on an autoranging combustible gas channel as it sets the fresh air reading for all

GX-2012 Operator’s Manual Start Up, Normal Mode • 27

channels. Once the countdown has finished, start up is complete and the unit is ready for monitoring.

Turning Off the GX-2012, Normal Mode

1. Press and hold the POWER ENTER button.

2. The buzzer will pulse for about three seconds and TURN OFF will be displayed along the bottom of the screen.

3. Release the button when TURN OFF disappears.

Measuring Mode, Normal Operation

The GX-2012 has three operating modes within Normal Mode: Measuring Mode, Display Mode, and Calibration Mode. This section describes using the GX-2012 in Measuring Mode during normal operation.

In Measuring Mode the GX-2012 continuously monitors the sampled atmosphere and displays the gas concentrations present for its target gases. In a low-light environment, press and release any button to turn on the display backlight. See “Updating the LCD Back Light Time Setting” on page 135 to program backlight duration. If the BEEP. SET menu item in Maintenance Mode is turned on, the GX-2012 beeps once every 5 minutes to confirm that it’s operating. See “Updating the Confirmation Beep Setting” on page 129 for instructions to update the setting.

Monitoring an Area

1. Start up the GX-2012 as described above in “Start Up, Normal Mode” on page 19 or “Turning On the GX-2012 in Normal Mode With All Modes Active”. It is now in Measuring Mode.

2. Take the GX-2012 to the monitoring area.

If the tapered rubber nozzle is used, put the nozzle tip in the area to be monitored.

If the hose and probe is used, put the probe tip in the area to be monitored.

3. Wait 10 - 15 seconds and observe the display for gas readings. If a reading is observed, allow the reading to stabilize to determine the gas concentrations present.

28 • Mea suring Mode, Normal Operation GX-2012 Operator’s Manual

NOTE: Response time increases with the length of the sample hose. Long

sample hoses will require more time to show a response at the GX-

2012. The maximum sample hose length recommended for the GX2012 is 50 feet. Consult RKI Instruments, Inc. for longer sample hose lengths.

4. If a gas alarm occurs, take appropriate action. See “Responding to Alarms” on page 39.

Using Optional Probes and Fittings

This section describes how to use the 8 meter hose with floating head and the purge tee fitting.

Using the 8 Meter Hose with Floating Head

This probe is designed to be used in a tank or a well that may have water or some other liquid at the bottom. To use the 8 meter hose with floating probe:

1. Start up the GX-2012 as described in “Start Up, Normal Mode” on page 19.

2. Connect the 8 meter hose with floating probe to the GX-2012’s quick connect inlet fitting.

3. Slowly lower the probe into the area you wish to monitor. If the probe hits water, it will float and continue to monitor the area.

Figure 14: 8 Meter Hose with Floating Head

Using the Purge Tee Fitting

The purge fitting is used to detect gas levels in a pressurized gas stream from a pipeline or vessel being purged.

1. Start up the GX-2012 as described in “Start Up, Normal Mode” on

GX-2012 Operator’s Manual Measuring Mode, Normal Operation • 29

page 19.

2. Connect the purge tee fitting to the GX-2012’s quick connect inlet fitting.

3. Insert the sample port into the flowing gas. The vent port will allow any excess gas to release to the atmosphere to avoid damage to pump or sensors.

Pressurized

Stream

Sample Port

GX-2012 Inlet

Figure 15: Purge Tee Fitting

Vent Port

Excess Pressurized Sample

Using the Dilution Fitting

The external dilution fitting is a 1:1 dilution fitting. It is normally used when it is necessary to introduce air into a sample that has no oxygen or a very low level of oxygen, such as a nitrogen purged sample. It can also be used when one of the target gas levels in the sample area will likely be present in a concentration above the detection range for that gas. Since the fittings partially consist of unplated brass, they are not appropriate for detection of elevated levels of H

1. Start up the GX-2012 as described in “Start Up, Normal Mode” on page 19.

2. Install the dilution fitting to the GX-2012’s quick connect inlet fitting.

3. Connect the tapered rubber nozzle or the sample hose to the GX-2012’s quick connect inlet fitting.

4. If a sample hose is used, screw the probe onto the sample hose’s threaded fitting.

5. Monitor the sampling area.

30 • Mea suring Mode, Normal Operation GX-2012 Operator’s Manual

NOTE: The GX-2012 can be calibrated either with or without the dilution

fitting in place. If calibrated without the dilution fitting in place, then display readings must be doubled to determine the actual gas concentration. If calibrated with the dilution fitting in place, then a sample bag must be used during calibration, and the display readings will be the actual gas concentrations.

CAUTION: If the dilution fitting is in place for calibration, do not use a

demand flow regulator. Use a sample bag. The use of a demand flow regulator with a dilution fitting when calibrating will result in an inaccurate calibration.

Figure 16: Dilution Fitting

Combustible Gas Detection

The GX-2012 can support two combustible gas sensors, a TC (thermal conductivity) sensor for detection in the % volume range, and a catalytic sensor for detection in the % LEL range. Either or both sensors may be installed in your unit.

If both the % volume and % LEL sensors are installed, the combustible gas channel is setup at the factory as % LEL/% volume autoranging. In this case, the combustible gas channel will display the combustible gas concentration in % LEL up to 100% LEL. If the combustible gas concentration rises above 100% LEL, then the unit automatically begins displaying the concentration in % volume.

CAUTION: If both combustible sensors are installed in your instrument,

make sure you follow the recommendations in the next section, “Applications with High Levels of Combustible Gas” on page 32, to protect the % LEL sensor. Failure to do so will result in damage to the % LEL sensor.

WARNING: If the combustible channel is set for % volume only, then

there are no gas alarms for any detection channel. See “HC Range Screen” on page 44.

There are three important issues to keep in mind when monitoring for combustible

gas.

GX-2012 Operator’s Manual Measuring Mode, Normal Operation • 31

Applications with High Levels of Combustible Gas

The GX-2012 provides the % LEL sensor with some protection by turning off the % LEL sensor power temporarily when it determines that a % LEL over scale (more than 100% LEL) concentration of combustible gas is present. When this happens, “OVER” is displayed below the gas list and the display units to the right of the combustible gas channel change to % volume. However, this protection is not adequate to completely prevent damage to the sensor when it is exposed to moderate or high levels of % volume gas.

Combustible gas is present at moderate or high % volume levels in many applications such as purging applications. If your GX-2012 is equipped with both the % LEL and %volume sensors, you must set up the instrument so that the combustible channel operates in the %volume only range when you use the instrument for this type of application to protect the % LEL sensor from damage. You can set the combustible channel to operate in the % volume range only in the HC Range Screen of Display Mode. See “HC Range Screen” on page 44 for instructions to set the combustible channel to operate in the % volume range only.

CAUTION: Failure to set the combustible channel to % volume only

operation when using the GX-2012 for applications with moderate to high % volume levels of combustible gas will result in damage to the % LEL sensor.

The instrument may be set up for combustible channel autoranging operation when it is used for confined space applications where % volume combustible gas concentrations are not likely to be found.

Silicone & Other Potentially Damaging Compounds

Silicone vapors and chlorine and fluorine compounds, such as chlorinated hydrocarbons, can damage the %LEL sensor. These compounds should be avoided. If exposure to these compounds is suspected, verify the %LEL response on a known gas sample.

%LEL Sensor Relative Responses

Although the standard factory setup and calibration for the combustible gas channel is to methane (CH

), the combustible sensors will respond to other

combustible gases as well.

The table below lists the conversion factors for several hydrocarbon gases for the % LEL combustible sensor if it is calibrated to methane. Conversion factors are not available for the % volume TC sensor. To use this table, multiply the display reading on the combustible gas channel by the factor in the appropriate row to obtain the actual gas concentration. For example, if

32 • Mea suring Mode, Normal Operation GX-2012 Operator’s Manual

you are detecting pentane and the display reads 10% LEL on the combustible gas channel, you actually have 10% LEL x 1.35 = 13.5% LEL pentane present.

Table 3: LEL Hydrocarbon Conversions

LEL Conversion

Gas

Acetone 1.92 Iso Butane 1.56

Acetylene 2.00 MEK 1.92

Benzene 2.00 Methane 1.00

Ethane 1.25 Methanol 1.65

Ethanol 1.75 Pentane 1.35

Ethylene 1.20 Propane 1.52

Heptane 1.92 Propylene 1.33

Hexane 1.65 Toluene 2.00

Hydrogen 1.00 Xylene 0.93

IPA 2.50

Factor (Methane

Calibration)

Gas

LEL Conversion Factor (Methane

Calibration)

Snap Log Mode

The snap logging function in Snap Log Mode allows the user to record data at a specific time and have it saved to the data logger. The data is assigned a snap log ID and is saved with the station ID that was in use when the data was taken.

To enter Snap Log Mode and record snap log data:

1. Press and hold the (SHIFT)T button, then press and hold the AIRS button and hold both until you hear a beep. The unit will cycle through the following screens.

GX-2012 Operator’s Manual Measuring Mode, Normal Operation • 33

REC. DATA

001

016

S Id

2011 9 27 22:37

YES/ENT.

CH4

H2S

NO /DISP

19.2 10

7.8

%LEL

ppm

The first screen displays what snap log ID will be given to this particular set of data. This ID number increases sequentially with each set of snap log data taken. The second screen displays what Station ID will be associated with this snap log. The third screen displays the year, month,

34 • Mea suring Mode, Normal Operation GX-2012 Operator’s Manual

day, and time of the snap log, and that you should press the POWER ENTER button to save a set of snap log data. The fourth screen displays the current gas readings, and that you should press the DISPLAY (ADJ) button to exit Snap Log Mode without saving a set of snap log data.

2. You can change the Station ID to be used with the snap log by pressing the (SHIFT)T button and then pressing the DISPLAY (ADJ) button. The Station ID Select Screen will appear and the current Station ID will be flashing.

S Id

001

SEL

3. Use the (SHIFT)T and AIRS buttons to scroll to the desired station ID, then press and release the POWER ENTER button to return to the Snap Logging Screen sequence.

To return to the Snap Logging Screen sequence without changing the station ID, press and release RESET SILENCE.

4. To take a snap log of the current gas readings, press and release the POWER ENTER button. The unit will display SAVED along the bottom of the screen before returning to the Snap Logging Screen sequence.

SAVED

To exit Snap Log Mode without taking a snap log or when you are finished recording snap logs, press and release the DISPLAY (ADJ) button. The unit will immediately return to the Normal Operation Screen.

5. The data recorded in Snap Log Mode can be viewed in Display Mode. See “Snap Logging Screen” on page 53 for more information.

GX-2012 Operator’s Manual Measuring Mode, Normal Operation • 35

Measuring Mode, Alarms

This section covers alarm indications in Measuring Mode. It also tells you how to reset the GX-2012 after an alarm has occurred and how to respond to an alarm condition.

NOTE: False alarms may be caused by radio frequency (RF) or

electromagnetic (EMI) interference. Keep the GX-2012 away from RF and EMI sources such as radio transmitters or large motors.

Alarm Indications

CAUTION: If the combustible channel is set for %volume only, then there

are no gas alarms for any detection channel. See “HC Range Screen” on page 44.

The GX-2012 will sound an alarm, the unit will vibrate, and the LED arrays will flash when one of the target gas concentrations rises above the Warning level, or in the case of oxygen, falls below the Low Alarm setting for that gas.

The GX-2012 also sounds an alarm, vibrates, and flashes the LED arrays when the Alarm level is reached for combustible gas, CO, and H

S, when the

concentration of oxygen rises above the High Alarm level, and when the STEL and TWA alarm points are reached for CO and H

When a failure condition occurs, such as a sensor failure, low flow, or dead battery condition, the unit will also sound an alarm, flash the LED arrays, and vibrate.

The table below summarizes the types of alarms produced by the GX-2012.

Table 4: Alarm Types and Indications

Alarm Type Visual Indications Other Indications

Low Alarm

Concentration of gas

rises above the Warning

level, or falls below the

Low Alarm level for O

• WARNING appears below the gas list.

• Reading for the gas in alarm flashes

• Alarm LED arrays

flash

• Backlight turns on

• Buzzer sounds alternating between a low and high pitch

• Vibrator pulses

36 • Mea suri ng Mo de, Alarms GX-2012 Operator’s Manual

Table 4: Alarm Types and Indications

Alarm Type Visual Indications Other Indications

High Alarm

Concentration of gas

rises above the Alarm level, or rises above the High Alarm level for O

TWA or STEL

Concentration of CO or

S rises above the

TWA or STEL alarm

point setting.

Over Range*

• ALARM appears below the gas list.

• Reading for the gas in alarm flashes

• Alarm LEDs flash

faster than warning indication

• Backlight turns on

• TWA or STEL appears below the gas list.

• Alarm LEDs flash

• Back light turns on

• Gas reading replaced by brackets flashing at same rate as alarm indication

• Alarm LEDs flash at same rate as alarm indication

• Back light turns on.

• OVER appears below the gas list.

• Buzzer sounds alternating between low and high pitch faster than warning indication

• Vibrator pulses faster than warning indication

• Buzzer sounds alternating between a low and high pitch at the same rate as warning indication

• Vibrator pulses at same rate as warning indication

• Buzzer sounds alternating between a low and high pitch at same rate as alarm indication

• Vibrator pulses at same rate as alarm indication

Low Flow*

Low Battery

• The display indicates

FAIL LOW FLOW

• The Alarm LED’s flash

• Battery icon blinks • None

• Buzzer sounds a double pulsing tone (two pulses in quick succession)

Warning*

Dead Battery Alarm*

GX-2012 Operator’s Manual Measuring Mode, Alarms • 37

• Gas readings replaced by FAIL

• Fan symbol disappears

• BATTERY displayed along bottom of screen

• Alarm LED arrays flash

Buzzer sounds a double pulsing tone (two pulses

in quick succession)

Table 4: Alarm Types and Indications

Alarm Type Visual Indications Other Indications

Sensor Failure*

Clock Failure*

System Failure*

Microprocessor

Failure*

• NOTE: The unit will not operate if this alarm occurs.

• FAIL appears at the bottom of the display and the failed sensor(s) are indicated

• Alarm LED arrays flash

• FAIL CLOCK appears on the display

• Alarm LED arrays flash

• FAIL SYSTEM appears on the display

• Alarm LED arrays flash

• Heart indicator is steadily on or not on at all

Buzzer sounds a double pulsing tone (two pulses

in quick succession)

Buzzer sounds a double pulsing tone (two pulses

in quick succession)

• Buzzer sounds a double pulsing tone (two pulses in quick succession)

• A failure code appears

• None

*This alarm can also occur in Bar Hole Mode

Resetting and Silencing Alarms

You can set the GX-2012’s gas alarms as latching or self-resetting alarms (see “Updating the Alarm Latching Setting” on page 117) and the buzzer operation as silenceable or not silenceable (see “Updating the Alarm Silence Setting” on page 118).

• Self-resetting alarms (LATCHING set to OFF)

Self-resetting alarms automatically shut off and reset when the gas reading falls below (or rises above for an oxygen low alarm) the alarm setting. You cannot silence or reset self-resetting alarms.

• Latching alarms (LATCHING set to ON)

You can set latching alarms with or without Alarm Silence (see “Updating the Alarm Silence Setting” on page 118).

With ALRM SLNC On and LATCHING On:

When the GX-2012 goes into a gas alarm, press the RESET SILENCE button to silence the buzzer. If the gas concentration was still above the alarm level when the button was pressed, the LEDs continue to flash, and the GX-2012

38 • Mea suri ng Mo de, Alarms GX-2012 Operator’s Manual

continues to display the current alarm level.

The gas reading must fall below (or rise above for an oxygen low alarm) the low alarm setting before you can reset the alarm. Press the RESET SILENCE button to reset the alarm. The LEDs turn off and the GX-2012 alarm indications on the display turn off.

With ALRM SLNC OFF and LATCHING ON:

The gas reading must fall below (or rise above for an oxygen low alarm) the low alarm setting before you can reset the alarm. Press the RESET SILENCE button to reset the alarm. The LEDs and buzzer turn off and the GX-2012 alarm indications on the display turn off.

NOTE: With ALRM SLNC set to OFF in Maintenance Mode, you cannot

silence the buzzer while the gas reading is above (below for an oxygen Low Alarm) the low alarm setting.

Responding to Alarms

This section describes response to gas, over range, battery, and sensor failure alarms.

Responding to Gas Alarms

1. Determine which gas alarm has been activated.

2. Follow your established procedure for an increasing gas condition or a decreasing oxygen condition.

3. If necessary, reset the alarm using the RESET SILENCE button once the alarm condition has been cleared.

Responding to Over Range Alarms

WARNING: An over range alarm may indicate an extreme combustible

gas, toxic gas, or oxygen concentration. Confirm a normal condition with a different GX-2012 or with another gas detecting device.

1. Determine which gas alarm has been activated.

2. Follow your established procedure for an increasing gas condition.

3. Reset the alarm using the RESET SILENCE button once the alarm condition has cleared.

4. Calibrate the GX-2012 as described in the calibration section of this manual.

GX-2012 Operator’s Manual Measuring Mode, Alarms • 39

5. If the over range condition continues, you may need to replace the sensor that has triggered the over range alarm.

6. If the over range condition continues after you have replaced the sensor, contact RKI Instruments, Inc. for further instructions.

Responding to Battery Alarms

WARNING: The GX-2012 is not operational as a gas monitoring device

during a dead battery alarm. Take the GX-2012 to a nonhazardous area and replace or recharge the batteries as described in “Replacing or Recharging the Batteries” on page 146.

The GX-2012 is fully functional during a low battery warning. However, only a limited amount of operating time remains, approximately 1 - 2 hours. The amount of time depends on how often the LCD backlight is used and how often the unit is responding to alarm conditions. Recharge the battery pack or replace the alkaline batteries as soon as possible as described in “Replacing or Recharging the Batteries” on page 146.

NOTE: Alarms and the back light feature consume battery power and

reduce the amount of operating time remaining.

Responding to Sensor Failure Alarms

1. Determine which sensor has triggered the sensor failure alarm.

2. Try calibrating the sensor first, as described in “Calibration Mode” on page 57 before replacing it.

3. If the sensor failure continues, replace the sensor as described in “Replacing a Sensor” on page 154.

4. If the sensor failure condition continues after you have replaced the sensor, contact RKI Instruments, Inc. for further instructions.

Responding to Clock Failure Alarm

This alarm occurs if the internal unit date has been changed to something unreasonable like 15/34 (month/day).

1. Press and release the RESET SILENCE button to continue into normal operation.

CAUTION: There will be no datalogging function if you operate the

instrument after a clock failure.

40 • Mea suri ng Mo de, Alarms GX-2012 Operator’s Manual

2. Attempt to change the date using the DATE menu time in Maintenance Mode. See “Updating the Date and Time Settings” on page 103.

3. If the date cannot be set correctly, contact RKI Instruments, Inc. as soon as possible.

Responding to System Failure Alarms

1. If a system failure occurs, the system failure screen will display an error code as shown below:

FAIL

SYSTEM

031

2. The error code meanings are shown below:

Table 5: Error Code Explanation

Error Code Explanation

000 MPU failure

010 RAM failure

021 EEPROM failure

031 FLASH memory failure

3. If the error code is anything but 031 as shown above, the instrument cannot be used. Contact RKI Instruments, Inc. as soon as possible.

If the error code is 031, you may press and release the RESET SILENCE button to continue to normal operation if the instrument must be used temporarily.

CAUTION: There will be no datalogging function if you operate the

instrument after a 031 system failure. Contact RKI Instruments, Inc. as soon as possible.

Responding to Microprocessor Failure

If your unit experiences a microprocessor failure, the heart symbol at the top of the screen will be steadily on or steadily off. The unit cannot be used in this case. Contact RKI Instruments, Inc. as soon as possible.

GX-2012 Operator’s Manual Measuring Mode, Alarms • 41

Inert Mode

Inert Mode is used to measure the combustible gas and/or oxygen level in a purged environment. In order for the instrument to operate in Inert Mode, the oxygen alarm must be set to H-HH operation in which both alarms are increasing. The oxygen Warning and Alarm points are factory set at 5.0% and

10.0%.

It is recommended that the %volume sensor be installed in a unit that is used to monitor combustible gas during Inert Mode operation since it does not require oxygen to work properly. The catalytic LEL sensor does not operate at oxygen concentrations below 10% volume. If it is necessary to use the catalytic LEL sensor during Inert Mode operation, a dilution fitting must be installed. Installing a dilution fitting will affect the oxygen reading since you’re introducing oxygen into the sample.

Alarms

The oxygen channel alarm points in Inert Mode are different from those in Normal Mode. All other alarm point settings remain unchanged.

Since the application for Inert Mode is to detect a rising oxygen level in purged environments, both oxygen alarms are set to rising. The factory set alarm point is 5.0% volume for the Warning and 10.0% volume for the Alarm. These alarm points are user adjustable in Maintenance Mode. See “Updating the Alarm Point Settings” on page 120 for instructions to set the alarm points.

Start Up and Operation

1. With the oxygen alarm pattern set to H-HH, start up the GX-2012 as described in “Turning On the GX-2012, Normal Mode Only” on page 19.

42 • Inert Mode GX-2012 Operator’s Manual

2. Once the warm up sequence is complete, the Normal Operation Screen will display and INERT will appear along the bottom of the display.

3. Since the oxygen concentration in fresh air is above both oxygen alarm points, the GX-2012 will go into alarm if turned on in a fresh air environment.

Display Mode

This section describes using the GX-2012 in Display Mode. With the GX2012 in Display Mode, you can:

• set the combustible gas channel range

• display peak readings

• display STEL and TWA readings (H

CH4

INERT

20.9 0

%LEL

ppm

S and CO only)

• display full scale, warning, alarm, STEL, and TWA (H

S and CO only)

values

• display time in operation

• display the date and time

• display remaining log time

• clear the data logger

• turn the pump on or off

• select a user ID

• select a station ID

• display snap logging data

• turn peak bar function on or off

To enter Display Mode, press and release the DISPLAY (ADJ) button while in Measuring Mode. To scroll from one screen to the next press and release the DISPLAY (ADJ) button.

GX-2012 Operator’s Manual Display Mode • 43

NOTE: Each screen displays for 20 seconds. If you do not press the

DISPLAY (ADJ) button to scroll to the next screen or press the POWER ENTER button to enter an item within 20 seconds, the GX2012 automatically returns to Measuring Mode.

HC Range Screen

This screen displays only if your GX-2012 is equipped with both the catalytic % LEL combustible sensor and the TC % volume combustible sensor. It

allows you to select the display units for the combustible channel as % LEL/% volume autoranging or % volume. If autoranging is selected, the combustible gas reading will be displayed in % LEL up to 100% LEL, which is equivalent to 5% volume for methane (CH

displayed in %volume. If % volume is selected, the combustible gas reading will be displayed in % volume only.

CAUTION: If the combustible channel is set for % volume only, then there

are no gas alarms for any detection channel and NO ALARM will appear in the upper left corner of the screen when you return to normal operation.

). Above 100% LEL, it will be

SEL 22:39

HC RANGE

To update the HC range setting:

1. After entering Display Mode and arriving at the HC Range Screen, press and release the POWER ENTER button. The current setting will appear at the bottom of the LCD.

2. Use the AIRS or (SHIFT)T button to change the setting.

3. Press the POWER ENTER button to save the change.

4. Press the DISPLAY (ADJ) button to advance to the next screen.

Peak Screen

The Peak Screen displays the highest (lowest for O2) concentrations detected since the GX-2012 was turned on. Peak readings are stored in the GX-2012’s

memory until a higher level is detected, the peak reading is reset, or the GX2012 is turned off.

44 • Display Mode GX-2012 Operator’s Manual

The lunch break feature enables the GX-2012 to remember peak readings when it is turned off so it can continue them when it is turned on again. See “Turning On the GX-2012, Normal Mode Only” on page 19. To reset the peak readings during operation, press and hold the RESET SILENCE button for a few seconds while in the peak screen.

CH4

H2S

PEAK

20.9 0

0.0

%LEL

ppm

STEL Screen

The STEL Screen displays the short-term exposure limit (STEL) readings for CO and H

minutes.

S only. The STEL reading is the average reading during the last 15

H2S

STEL

0.0

ppm

TWA Screen

The TWA Screen displays the time-weighted average (TWA) readings for CO and H

The TWA reading is the average reading during the last 8 hours. If 8 hours have not elapsed since the last time the TWA reading was cleared, the average is still calculated over 8 hours. The missing time is assigned a 0 value for readings.

S only.

H2S

TWA

0.0

ppm

GX-2012 Operator’s Manual Display Mode • 45

Alarm Points Screen

The Alarm Points Screen allows you to view each channel’s alarm settings for full scale, warning, alarm, STEL (for CO and H

CO and H

S only). The bottom line of the screen will alternate between

S only), and TWA (for

ALARM--P, NO /DISP, and YES/ENT.

dISP

ALARM--P

Press the POWER ENTER button to proceed to view the full scale settings. Use the AIRS or (SHIFT)T buttons to scroll through screens showing the different settings.

vol%

CH4

H2S

F. S .

100

40.0 500

100.0

%LEL

ppm

CH4

H2S

WARNING

CH4

H2S

ALARM

46 • Display Mode GX-2012 Operator’s Manual

19.5 25

5.0

23.5

30.0

%LEL

ppm

%LEL

ppm

STEL

200

15.0

ppm

H2S

TWA

10.0

ppm

Pressing and releasing POWER ENTER while in a settings screen will cause the instrument to simulate that condition. The buzzer, LEDs, and vibration will activate. Press and release POWER ENTER again to stop the simulated alarm.

Operation Time Screen

The operation time screen displays the time in minutes since the GX-2012 was last turned on. The operation time may be continued from the last time the GX-2012 was in operation by using the lunch break option. See “Turning On the GX-2012, Normal Mode Only” on page 19.

OP. TIME

0:11

GX-2012 Operator’s Manual Display Mode • 47

Date/Time Screen

The date/time screen displays the current date and time with the order being year, month, day, time.

2011

8 31

22:39

DATE

Remaining Log Time Screen

The remaining log time screen displays the time remaining until the data logger memory is full. The remaining log time depends on how often the GX2012 stores data to the data log, how many channels are active, and how often the GX-2012 is turned on and off.

LOG

276 H

REMAIN

The table below illustrates how much data logging time is available for the various interval times. It assumes that the unit is set up with all 5 sensors and there are no alarm occurrences.

Table 6: Data Logging Capacity, 5 Sensor GX-2012

Interval

Time

10 seconds 10 hours

20 seconds 20 hours

30 seconds 30 hours

1 minute 60 hours

Data Logging Time

3 minutes 180 hours

5 minutes 300 hours

10 minutes 600 hours

48 • Display Mode GX-2012 Operator’s Manual

Clear Data Logger Screens

CAUTION: Once you clear the data logger, you cannot retrieve any data

previously stored in the data logger.

NOTE: This item appears in Display Mode only if the DLOG DSP menu

item in Maintenance Mode is turned ON. The factory setting for DLOG DSP is ON.

The clear data logger screens allow you to clear the data logger storage. You can set the GX-2012 to overwrite the oldest data when the data log is full. See “Updating the Datalog Overwrite Setting” on page 129. The bottom line of the screen alternates between LG CLEAR, NO /DISP, and YES/ENT.

CLr

LOG

LG CLEAR

To clear the data log:

1. With the above screen displayed, press and release the POWER ENTER button. The instrument will ask you to confirm that you want to clear the data log and CLr LOG will be flashing. The bottom line of the screen alternates between CONFIRM?, YES/ENT., AND NO /DISP.

CLr

LOG

CONFIRM?

2. To cancel the clear data log and return to the Clear Data Logger Screen in Display Mode, press and release DISPLAY (ADJ).

To continue with the clear data log, press and release POWER ENTER.

GX-2012 Operator’s Manual Display Mode • 49

3. The GX-2012 displays 4 dashes and as the GX-2012 clears the data, the dashes disappear. When the last dash is gone, the GX-2012 has been cleared and the remaining log time value is reset.

- - - -

LG CLEAR

Pump OFF Screen

WARNING: The GX-2012 is not a gas monitoring device while the pump

is off.

NOTE: This item appears in Display Mode only if the POFF DSP menu

item in Maintenance Mode is turned ON. The factory setting for POFF DSP is OFF.

The GX-2012 pump can be turned on and off in this screen. The bottom line of this screen alternates between PUMP OFF, NO /DISP, and YES/ENT. This feature can be used to conserve battery life if there is a significant period of time until the next gas monitoring task, but you do not want to wait for the warmup sequence to complete if you turn the instrument off and on again.

PUMP OFF

In this screen, press POWER ENTER to turn the pump off. The fan in the upper right corner of the screen will disappear. Once the pump is off, you cannot exit this screen and return to normal operation or continue in Display Mode until you turn the pump back on. To turn the pump back on and continue in Display Mode or return to Normal Operation, press the POWER ENTER button again.

50 • Display Mode GX-2012 Operator’s Manual

User ID Screen

This screen displays only if ID DISP in the Maintenance Mode menu is set to ON (see “Turning the ID Display Function On or Off” on page 135). Each user ID can contain up to 16 characters but only the first 8 of those characters are visible in the instrument. Be sure that all user IDs are distinguishable from each other by viewing only the first 8 characters. For more information, see the GX-2012 Data Logger Management Program manual. The bottom line of the screen alternates between YES/ENT., the current user ID, and NO /DISP. Uppercase letters, numbers, asterisks (*), dashes (-), and a blank space are available characters. The GX-2012 can store 128 user IDs.

Use this screen to identify or change the user. The user ID provides a way to identify the user during a data logging session. The user ID is saved to the data logger for that session when you turn off the GX-2012 or change users during operation. This allows you to change the user ID during operation and have each user ID that was used during an operating session saved for the corresponding data.

U Id

SEL

YES/ENT.

NOTE: As shipped from the factory, the user ID on this screen is shown as -

- -- -- -- -- -- until you enter this screen and select a user ID.

To change a user:

1. After entering Display Mode and proceeding to the User ID screen, press and release the POWER ENTER button. The bottom line of this screen alternates between YES/ENT., the current user ID, and NO /DISP.

U Id

SEL

USER--001

GX-2012 Operator’s Manual Display Mode • 51

2. Use the AIRS and (SHIFT)T buttons to scroll through the 128 possible user IDs.

3. Press the POWER ENTER button to select a user ID.

Station ID Screen

This screen displays only if ID DISP in the Maintenance Mode menu is set to ON (see “Turning the ID Display Function On or Off” on page 135). Each station ID can contain up to 16 characters but only the first 8 of those characters are visible in the instrument. Be sure that all station IDs are distinguishable from each other by viewing only the first 8 characters. For more information, see the GX-2012 Data Logger Management Program manual. The bottom line of the screen alternates between YES/ENT., the current station ID, and NO /DISP. Uppercase letters, numbers, asterisks (*), dashes (-), and a blank space are available characters. The GX-2012 can store 128 station IDs.

Use this screen to identify or change the station. The station ID provides a way to identify the station during a data logging session. The station ID is saved to the data logger for that session when you turn off the GX-2012 or change stations during operation. This allows you to change the station ID during operation and have each station ID that was used during an operating session saved for the corresponding data.

S Id

SEL

YES/ENT.

NOTE: As shipped from the factory, the station ID on this screen is shown

as -- -- -- -- -- -- until you enter this screen and select a station ID.

52 • Display Mode GX-2012 Operator’s Manual

To change a station:

1. After entering Display Mode and proceeding to the Station ID screen, press and hold the POWER ENTER button. The bottom line of this screen alternates between YES/ENT., the current station ID, and NO / DISP.

S Id

SEL

001

2. Use the AIRS and (SHIFT)T buttons to scroll through the 128 possible station IDs.

3. Press the POWER ENTER button to select a station ID.

Snap Logging Screen

The Snap Logging Screen allows you to view data from previous snap loggings. For information on how to use the snap logging feature, see “Snap Log Mode” on page 33.

1. To view snap logging data, use the AIRS and (SHIFT)T buttons to scroll to the Snap Logging Screen. The bottom line of this screen alternates between REC. DATA, NO /DISP, and YES/ENT.

d ISP

REC. DATA

2. Press and release the POWER ENTER button. If no snap logs have been performed, the following screen will appear.

NO DATA

GX-2012 Operator’s Manual Display Mode • 53

3. If snap logs have been performed, the following screen will appear.

2011 8 31 22:39

M023

This screen indicates the year, month, day, and time that the most recent snap log was taken. The number along the bottom of the screen indicates the snap log ID number. The first snap log that is taken is given an ID of M001. The next snap log ID is M002. The ID number increases sequentially with each set of snap log data. Use the AIRS and (SHIFT)T buttons to scroll through different snap log IDs and view what time they were taken.

4. To view the data in a snap log ID, press and release the POWER ENTER button.

CH4

H2S

001

23.5 50

30.0

%LEL

ppm

The gas readings that were taken during the snap log are displayed and the Station ID that was in use during the snap log is displayed along the bottom of the screen. You can use the AIRS and (SHIFT)T buttons to scroll through the different snap logs. The gas readings and station ID will change but the snap log ID is not visible from this screen. To scroll through the data by viewing the snap log ID number, press and release POWER ENTER.

54 • Display Mode GX-2012 Operator’s Manual

Peak Bar Select Screen

The Peak Bar Select Screen allows you to turn the peak bar on or off. If the function is turned on, the peak bar appears along the left side of the screen during Normal Operation and on the Peak Screen in Display Mode. It shows the peak readings for each channel in bar graph format. The bottom line of this screen alternates between the current setting, NO /DISP, and YES/ENT.

bAr SEL

BAR OFF

To adjust the peak bar selection:

1. Use the DISPLAY (ADJ) button to scroll to the Peak Bar Select Screen. The screen indicates the current setting.

bAr SEL

BAR ON

2. Press and release the POWER ENTER button.

PEAK BAR

3. Use the AIRS and (SHIFT)T buttons to make your selection and press and release the POWER ENTER button.

GX-2012 Operator’s Manual Display Mode • 55

Data Logging

NOTE: The GX-2012 logs data in both Normal Mode and Bar Hole Mode.

The GX-2012 features the ability to log data to its internal memory and download it to a computer via the infrared communications port located just below the RESET SILENCE button. It logs gas readings during normal operation, alarm data, and calibration data.

NOTE: The data logging function is separate from the snap logging

function. For a description of the snap logging function, see “Snap Log Mode” on page 33.

To utilize the GX-2012’s downloading capability, you will need the GX-2012 downloading software and a computer with an infrared port or a USB port that runs one of the following operating systems: Windows XP, Windows Vista, or Windows 7. If your computer has an infrared port, then no additional accessories are needed to download data from the GX-2012. If your computer does not have an infrared port but does have a USB port, a USB/IrDA adapter cable can be used to download data from the GX-2012 using a USB port. The downloading software is available from RKI Instruments, Inc. The adapter cable is also available from RKI or may be purchased at a computer or electronics supply store.

For a complete description of the downloading software and procedures for downloading data to a computer, see the GX-2012 Data Logger Management Program Operator’s Manual.

SDM-2012

The GX-2012 can be used with the SDM-2012 if desired. The SDM-2012 can charge the instrument if the lithium ion battery pack is being used. It can also bump test, calibrate, and retrieve saved data. The SDM-2012 can be operated as a single, stand-alone unit or can be used with up to 9 other SDM-2012s and operated using a computer. For more information about the operation of the SDM-2012, see the SDM-2012 operator’s manual.

56 • Data Logging GX-2012 Operator’s Manual

Calibration Mode

Calibration Mode allows you to calibrate the GX-2012’s sensor response and to bump test the GX-2012.

CAUTION: BEFORE EACH DAY’S USAGE, SENSITIVITY IN THE

% LEL RANGE MUST BE TESTED ON A KNOWN CONCENTRATION OF THE COMBUSTIBLE TARGET GAS, METHANE, EQUIVALENT TO 25 - 50% OF FULL SCALE CONCENTRATION (The % LEL full scale is 100% LEL). ACCURACY MUST BE WITHIN -0 to + 20% OF ACTUAL. ACCURACY MAY BE CORRECTED BY FOLLOWING THE CALIBRATION INSTRUCTIONS FOR THE COMBUSTIBLE CHANNEL BELOW.

If the combustible channel passes the above response test and does not require calibration, the unit should still be calibrated periodically. The optimum frequency of calibration depends heavily on how the GX-2012 is used. For example, instruments used daily may need to be calibrated weekly or monthly, while instruments that are used only a few times a year may need to be calibrated before each use. Typical calibration frequencies range from monthly to quarterly. Make sure to perform the combustible channel response test as described above and make sure to develop a calibration schedule tailored to your application that takes this test and required calibration resulting from this test into account.

You can program the GX-2012 to notify you when it is due for calibration. See “Updating the Calibration Reminder Setting” on page 130.

Calibration/Bump Test Supplies and Equipment

To calibrate or bump test the GX-2012, you will need:

• Known calibrating samples of the gases being detected. The combustible

and toxic gas samples should have concentrations in approximately the middle of the range of detection. An oxygen-free source, such as 100% nitrogen is recommended for setting the oxygen zero when using single calibration.

• A demand-flow regulator to provide adequate sample gas flow

• Non-absorbent tubing

GX-2012 Operator’s Manual Calibration Mode • 57

CAUTION: If you are using a calibration kit that includes a gas bag and a

fixed flow regulator or dispensing valve, do not apply gas directly to the GX-2012 with the regulator or valve or damage to the pump will result. See “Appendix A: Calibrating and Bump Testing with a Sample Bag” on page 161 for instructions to properly use a gas bag kit.

To calibrate or bump test the %LEL, Oxygen, CO, and H

S sensors at the

same time, automatically, with no need for a zero-oxygen source, you can use the auto calibration feature with a 4-gas cylinder. If the H

S channel is not

active, then a 3-gas cylinder may be used for auto-calibration. This section includes instructions for auto calibration and bump testing with a demandflow regulator, a 4-gas cylinder, and a %volume methane cylinder. This section also includes instructions for calibrating one channel at a time using single calibration.

NOTE: If the combustible gas channel(s) are calibrated to a gas other than

methane, use an appropriate multigas cylinder or use single calibration to calibrate the combustible channel(s).

Preparing for Calibration or Bump Testing

Whether you will calibrate the GX-2012 using auto calibration, single calibration, or perform a bump test, you will need to set the fresh air readings first.

1. Find a fresh-air environment. This is an environment free of toxic or combustible gases and of normal oxygen content (20.9%).

2. Turn on the unit as described in “Turning On the GX-2012, Normal Mode Only” on page 19 or in “Turning On the GX-2012 in Normal Mode With All Modes Active” on page 25. Use the sample hose and probe.

3. With the unit on, perform a fresh air adjustment by pressing and holding the AIRS button. The display prompts you to hold the AIRS button.

4. Continue to hold the AIRS button until the display prompts you to release it. The GX-2012 will set the fresh air reading for all channels as it counts down from 8. If the combustible channel is set as %LEL only or vol% only, there is no countdown period. The fresh air reading is set immediately.

5. Install the demand flow regulator onto the calibration cylinder.

6. Connect the sample tubing to the demand flow regulator.

58 • Calibration Mode GX-2012 Operator’s Manual

Calibrating the GX-2012

From Measuring Mode, enter Calibration Mode by pressing and holding the (SHIFT)T button, then pressing the DISPLAY(ADJ) button and releasing both. If the unit prompts you for the password, enter it by using the AIRS and (SHIFT)T buttons to select each password number and then pressing and releasing POWER ENTER to confirm it and move on to the next number. To go back a number, press and release the RESET SILENCE button. The factory set password is the same as the factory set password for Maintenance Mode: 2102. You can change the password by entering the PASSWORD menu item in Maintenance Mode. See “Turning the Password Function On or Off” on page 141. If you enter an incorrect password, an error screen will display.

PASSWORD

Err

To return to normal operation, press and release the RESET SILENCE button. You may then try to reenter Calibration Mode.

MAINTENANCE will appear along the top of the screen once you have entered Calibration Mode. The first item in the calibration menu, AIR CAL, displays.

NOTE: The following screens illustrate a four-gas GX-2012 with both a

%LEL and a %volume combustible gas sensor as examples only. Your GX-2012 may display slightly different screens.

MAINTENANCE

AIR CAL

The GX-2012’s calibration menu includes two methods of calibration: auto calibration and single calibration.

• Auto Calibration: This method allows you to calibrate the combustible

gas (%LEL sensor only), OXY, H

GX-2012 Operator’s Manual Calibration Mode • 59

S, and CO sensors simultaneously. It is

designed for use with the RKI 4-gas calibration cylinder and is the quickest and easiest method to calibrate the GX-2012. If installed, you may also calibrate the %volume sensor separately from the standard four.

• Single Calibration: This method allows you to calibrate one sensor at a

time. Use this method if you are only calibrating one or two sensors, if you are calibrating only the %volume combustible sensor, or if you are not using the RKI 4-gas calibration cylinder.

Calibrating with the Auto Calibration Method

This section describes calibration using the auto calibration method. To calibrate using the single calibration method, see “Calibrating with the Single Calibration Method” on page 63. These instructions assume you are using a 4-gas cylinder and a %volume methane cylinder.

NOTE: If the combustible gas channel(s) are calibrated to a gas other than

methane, use an appropriate multigas cylinder or use single calibration to calibrate the combustible channel(s).

1. You may only calibrate either the standard 4 sensors or the % volume combustible sensor at a time. Once you are finished, you are returned to the initial AUTO CAL screen and must begin the auto calibration process again.

2. Use the AIRS and (SHIFT)T buttons to display the AUTO CAL menu item, press and release the POWER ENTER button to display the calibration values screen. If you want to exit back to the main menu without completing a calibration, press and release the DISPLAY (ADJ) button.

60 • Calibration Mode GX-2012 Operator’s Manual

3. Use the AIRS or (SHIFT)T button to alternate between the 4-gas and the % volume combustible gas calibration values screens.

MAINTENANCE

CH4

H2S

AUTO CAL

MAINTENANCE

CH4

AUTO CAL

12.0

25.0

100

%LEL

ppm

vol%

4. The gas concentrations displayed in the calibration values screens must match the gas concentrations listed on the calibration cylinders. If all concentrations match, go to step 12. If one or more concentrations do not match, continue with step 5.

5. To adjust the values on the screens, hold down the (SHIFT)T button, then press the DISPLAY(ADJ) button and release both. The %LEL sensor is shown here.

MAINTENANCE

CH4

AUTO CAL

- - -

%LEL

6. Use the AIRS and (SHIFT)T buttons to scroll through the sensors and select the sensor whose calibration gas value you want to adjust.

7. Press and release the POWER ENTER button. The sensor’s calibration gas value will flash.

8. If necessary, use the AIRS and (SHIFT)T buttons to set the correct calibration gas value.

9. Press and release POWER ENTER button to save the change.

10. Repeat steps 6 through 9 to set the correct values for any additional

GX-2012 Operator’s Manual Calibration Mode • 61

sensors.

11. After the last calibration gas value is set, use the AIRS button to scroll to ESCAPE and press POWER ENTER to return to the calibration gas values screens.

NOTE: The RKI Four Gas Cylinder typically contains 12% O

by volume.

Be sure to set the “OXY” reading to agree with the concentration listed on the cylinder’s label, not zero.

12. Use the AIRS or (SHIFT)T button to select which sensor(s) you want to calibrate, the standard 4 sensors or the %volume combustible gas sensor.

The following instructions illustrate calibrating the standard 4 sensors first, then the %volume combustible gas sensor.

13. With the 4-gas calibration values screen displayed, press the POWER ENTER button. AUTO CAL begins to flash and the current gas readings are displayed. If you want to exit back to the main menu without completing a calibration, press and release the DISPLAY (ADJ) button.

MAINTENANCE

CH4

H2S

AUTO CAL

20.9

0.0

%LEL

ppm

14. Connect the tubing from the demand flow regulator to the rigid tube on the probe. Allow the gas to flow for one minute.

15. Press and release the POWER ENTER button to set the calibration to the programmed values.

If all channels passed calibration, PASS displays along the bottom of the screen, then the calibration menu displays.

62 • Calibration Mode GX-2012 Operator’s Manual

If any of the sensors cannot calibrate to the proper value, FAIL displays along the bottom of the screen and the GX-2012 lists the sensor(s) that failed to calibrate. In the example below, the OXY and H

S channels

failed calibration. The other sensors calibrated normally.

MAINTENANCE

FAIL

H2S

ppm

The buzzer and alarm lights activate. Press and release the RESET SILENCE button after the buzzer and lights stop to reset the alarm and return to the calibration menu. Attempt to calibrate again. If the failure continues, investigate the cause. See “Troubleshooting” on page 143.

16. Disconnect the tubing from the probe.

17. Unscrew the demand flow regulator from the calibration cylinder.

18. If you have a 5 sensor unit and wish to calibrate the %volume combustible gas sensor, go back to step 1 and repeat the process selecting the %volume calibration gas value screen in step 12 and using a %volume methane cylinder.

If you are finished calibrating, use the (SHIFT)T button to navigate to the NORMAL menu item, then press and release the POWER ENTER button to return to Measuring Mode.

Calibrating with the Single Calibration Method

This section describes calibration using the Single Calibration method. To calibrate using the Auto Calibration method, see “Calibrating with the Auto Calibration Method” on page 60.

The procedure below describes a span adjustment of one channel using a calibration kit that includes a 4-gas calibration cylinder, a 0.5 LPM (liters per minute) regulator, and non-absorbent sample tubing. The standard 4-gas cylinder consists of 50% LEL methane, 12% oxygen, 50 ppm CO, 25 ppm

S, and a balance of nitrogen. In the example below, the CH4 channel’s

span is adjusted. See “Parts List” on page 158 for available calibration kits and calibration kit spare parts.

Calibration cylinders that contain only one target gas may also be used for single calibration. For channels other than oxygen, RKI Instruments, Inc. recommends that you use a cylinder that contains a concentration of 10-50%

GX-2012 Operator’s Manual Calibration Mode • 63

of the full scale value of the target gas. For example, if you are calibrating the combustible gas channel, your calibration cylinder should have a combustible gas concentration between 10% LEL and 50% LEL. For the oxygen channel, RKI Instruments, Inc. recommends using 100% nitrogen to perform the adjustment but any concentration between 0% oxygen (100% nitrogen) and 17% oxygen can be used to make the adjustment.

NOTE: If your combustible gas channel is calibrated to a gas other than

methane, use an appropriate gas cylinder to perform the calibration.

CAUTION: The single calibration method does not have a “FAIL”

notification. If a sensor cannot be set to agree with the calibration source, see “Troubleshooting” on page 143.

1. While in the calibration menu, use the AIRS or (SHIFT)T button to navigate to the ONE CAL menu option.

MAINTENANCE

ONE CAL

2. Press and release the POWER ENTER button to display the single calibration menu. The %LEL sensor will be displayed first.

MAINTENANCE

CH4

ONE CAL

- - -

%LEL

64 • Calibration Mode GX-2012 Operator’s Manual

3. Use the AIRS or (SHIFT)T button to display the sensor you want to calibrate (in this example the combustible gas % LEL sensor). If you have a 5 sensor unit, the %vol sensor will be one of the choices. It is shown below.

MAINTENANCE

CH4

ONE CAL

- - -

vol%

4. Press and release the POWER ENTER button. The single calibration screen displays for the sensor you selected. The gas reading flashes.

MAINTENANCE

CH4

ONE CAL

%LEL

5. Connect the tubing from the demand flow regulator to the rigid tube on the probe. Allow the calibration gas to flow for one minute.

6. If necessary, use the AIRS and (SHIFT)T buttons to adjust the reading to match the concentration listed on the calibration cylinder.

If the reading already matches the concentration listed on the calibration cylinder, press and release the AIRS button then press and release the (SHIFT)T button so that the instrument sees a change and resets the calibration date.

7. Press and release the POWER ENTER button to save the span value. The LCD will indicate that the calibration has ended, then the single calibration menu displays.

MAINTENANCE

CH4

ONE CAL

- - -

%LEL

GX-2012 Operator’s Manual Calibration Mode • 65

8. Disconnect the tubing from the probe.

9. Repeat steps 3 through 8 for any other sensors you want to calibrate. Make sure you use an appropriate calibration cylinder for each sensor.

CAUTION: When calibrating the oxygen channel, verify the concentration

of oxygen listed on the cylinder’s label. For oxygen-free samples (100% nitrogen for example), set the oxygen zero setting to

0.0%.

10. After the last channel is calibrated, disconnect the calibration tubing from the probe, then unscrew the demand flow regulator from the calibration cylinder.

11. Use the AIRS and (SHIFT)T buttons to scroll to ESCAPE in the ONE CAL menu.

12. Press and release the POWER ENTER button to exit ONE CAL.

13. With the ONE CAL menu option displayed, press the (SHIFT)T button until the NORMAL menu option is displayed.

14. Press and release the POWER ENTER button to return to Measuring Mode.

Bump Testing the GX-2012

NOTE: The BUMP DSP menu item in Maintenance Mode is factory set to

OFF. The BUMP menu item will not appear unless BUMP DSP is set to ON. See “Turning the Bump Test Function On or Off” on page 125 for instructions.

NOTE: The GX-2012 uses parameters defined in the BUMP--SET menu

item of Maintenance Mode while performing a bump test. To view or update these parameters, see “Updating the Bump Test Parameters” on page 127.

NOTE: If the combustible gas channel(s) are calibrated to a gas other than

methane, use an appropriate multigas cylinder.

66 • Calibration Mode GX-2012 Operator’s Manual

PASSWORD

Err

To return to normal operation, press and release the RESET SILENCE button. You may then try to reenter Calibration Mode.

MAINTENANCE will appear along the top of the screen once you have entered Calibration Mode. The first item in the calibration menu, AIR CAL, displays.

1. Install the demand flow regulator onto the calibration cylinder.

2. Connect the sample tubing to the demand flow regulator.

3. Install the hose and probe to the GX-2012.

4. Use the AIRS or (SHIFT)T buttons to display the BUMP menu item.

MAINTENANCE

BUMP

GX-2012 Operator’s Manual Calibration Mode • 67

5. Press and release the POWER ENTER button to display the bump test gas values.

MAINTENANCE

CH4

H2S

BUMP 30

12.0

25.0

%LEL

ppm

6. Use the AIRS or (SHIFT)T buttons to see the %volume combustible gas bump test value.

MAINTENANCE

CH4

BUMP 30

100

vol%

7. A bump test may be performed on the standard 4 sensors or on the %volume combustible sensor. Use the AIRS or (SHIFT)T buttons to display the screen for the sensor(s) you wish to bump test.

8. Before proceeding, confirm that the bump test gas value(s) are the same as the concentration(s) in the calibration cylinder. If they are not, adjust the bump test gas value(s) by entering the AUTO CAL menu item, changing the values there, and reentering the BUMP menu.

9. Connect the tubing from the demand flow regulator to the rigid tube on the probe then quickly press and release the POWER ENTER button. The unit will begin counting down from 30.

68 • Calibration Mode GX-2012 Operator’s Manual

10. When AUTO CAL in the BUMP--SET menu item in Maintenance Mode is set to OFF:

• The instrument will indicate which channels passed or failed the

bump test with a P (pass) or an F (fail) to the right of the gas.

MAINTENANCE

CH4

H2S

BUMP

F P F P

%LEL

ppm

• To view the bump test gas readings press the AIRS or (SHIFT)T

button. You can scroll between the bump test results and the bump test gas readings with the AIRS or (SHIFT)T button.

MAINTENANCE

CH4

H2S

BUMP

12.0

25.0

%LEL

ppm

• To return to the BUMP screen in Calibration Mode, press POWER

ENTER.

MAINTENANCE

BUMP

If one or more sensors fail the bump test, see “Troubleshooting” on page 143 to investigate the cause of the failure and replace the failed sensor or sensors if necessary.

• Disconnect the tubing from the probe.

GX-2012 Operator’s Manual Calibration Mode • 69

11. When AUTO CAL in the BUMP--SET menu item in Maintenance Mode is set to ON:

If all channels pass the bump test,

• The following screen appears:

MAINTENANCE

CH4

H2S

BUMP

P P

%LEL

ppm

• To view the bump test gas readings press the AIRS or (SHIFT)T

button. You can scroll between the bump test results and the bump test gas readings with the AIRS or (SHIFT)T buttons.

MAINTENANCE

CH4

H2S

BUMP

12.0 47

23.0

%LEL

ppm

• To return to the BUMP screen in Calibration Mode, press POWER

ENTER.

MAINTENANCE

BUMP

• Disconnect the tubing from the probe.

If any channel fails the bump test,

• The instrument will beep and a calibration is immediately and

automatically started. Continue to apply the calibration gas. CAL on the bottom left of the screen will alternate with APPLY.

The calibration time will begin to countdown in seconds in the lower right of the screen. The calibration time counted down during a

70 • Calibration Mode GX-2012 Operator’s Manual

calibration initiated because of a failed bump test is the difference between the bump test gas time and the calibration time defined in the BUMP--SET menu item in Maintenance Mode.

MAINTENANCE

CH4

H2S

CAL 60

20.9 37

10.0

%LEL

ppm

• At the end of the calibration, the instrument displays the results from

both the bump test and the calibration. Use the AIRS or (SHIFT)T button to scroll between the calibration/bump test results, the bump test gas readings, and the calibration gas readings.

MAINTENANCE

CH4

H2S

BUMP/CAL

FP PP FF

%LEL

ppm

MAINTENANCE

CH4

H2S

BUMP/

MAINTENANCE

CH4

H2S

/CAL

12.0 5

23.0

12.0 5

25.0

%LEL

ppm

%LEL

ppm

GX-2012 Operator’s Manual Calibration Mode • 71

• To return to the BUMP screen in Calibration Mode, press POWER

ENTER at any time. If any channel failed the calibration, the buzzer will sound a double pulsing tone until you press and release the POWER ENTER button.

MAINTENANCE

BUMP

• Disconnect the tubing from the probe.

12. Unscrew the demand flow regulator from the calibration cylinder.

13. With the BUMP menu option displayed, press the (SHIFT)T button until the NORMAL menu option is displayed.

14. Press and release the POWER ENTER button to return to Measuring Mode.

72 • Calibration Mode GX-2012 Operator’s Manual

Chapter 4: Using the GX-2012 in Bar Hole Mode

Overview

This chapter explains how to operate the GX-2012 in Bar Hole Mode. Bar Hole Mode is used to perform consistent checks of bar holes when tracking down underground gas leaks. When the GX-2012 is in Bar Hole Mode, only the combustible and oxygen channels are displayed.

If a GX-2012 is intended for bar hole testing, it is shipped with Bar Hole Mode enabled so that the operator must choose which operational mode to use when the unit is turned on.

NOTE: Units intended for bar hole testing are typically calibrated to

methane. In addition, the unit must have a %volume combustible sensor installed.

Start Up, Bar Hole Mode

This section explains how to start up the GX-2012 in Bar Hole Mode and get it ready for operation.

Turning On the GX-2012, Bar Hole Mode

WARNING: If a CO or H2S sensor is installed, these sensors will not be

active while the GX-2012 is in Bar Hole Mode.

WARNING: Gas alarms are not active when the GX-2012 is in Bar Hole

Mode.

The following description of the GX-2012 start up sequence assumes that the following menu items in Maintenance Mode are turned on: LNCH BRK, ID DISP, CL RMNDR, and BP RMNDR. If either of these items is turned off, then the corresponding screen will not appear.

NOTE: In order for BAR HOLE MODE to appear as a selection in the

Mode Select Screen in Step 3 below, the L./B. MODE menu item in Maintenance Mode must be set to bH or LC bH.

1. Connect the sample hose to the GX-2012’s quick connect inlet fitting.

2. Screw the bar hole probe onto the sample hose’s threaded fitting.

GX-2012 Operator’s Manual Overview • 73

3. Press and briefly hold down the POWER ENTER button. The Normal Mode Select Screen displays.

vol%

CH4

H2S

NORMAL ?

20.9 0

0.0

%LEL

ppm

4. Use the AIRS or (SHIFT)T buttons to scroll to the Bar Hole Mode Select Screen.

BAR HOLE MODE

CH4

20.9

B.H. MODE?

vol% %LEL ppm vol% %

sec

5. With the Bar Hole Mode Select Screen displayed, press and release the POWER ENTER button to begin the Bar Hole Mode startup sequence.

NOTE: If no button is pressed for 20 seconds, the unit will proceed into

whichever mode is displayed.

6. If CL RMNDR is turned on (factory setting), the screen that appears next depends on how CL EXPRD is set in the Maintenance Mode Menu (page 130).

• If the unit is due for calibration and CL EXPRD is set to CONFIRM

(factory setting), then the following screen displays.

CAL

C--LIMIT

The alarm LED’s and buzzer will pulse several times. After this, press and release the RESET SILENCE button to continue.

74 • Start Up, Bar Hole Mode GX-2012 Operator’s Manual

• If the unit is due for calibration and CL EXPRD is set to NOT USE,

then the following screen displays.

FAIL

C--LIMIT

• If calibration is not due or CL EXPRD is set to NO EFFECT, then

the following screen appears for a few seconds indicating when the next calibration is due.

2011 9 30 69d

NEXT CAL

7. If BP RMNDR is turned on (factory setting is OFF), the screen that appears next depends on how BP EXPRD is set in the Maintenance Mode Menu (page 131).

• If the unit is due for a bump test and BP EXPRD is set to CONFIRM

(factory setting), then the following screen displays.

tESt

B--LIMIT

The alarm LED’s and buzzer will pulse several times. After this, press the RESET SILENCE button until you hear a beep to continue.

GX-2012 Operator’s Manual Start Up, Bar Hole Mode • 75

• If the unit is due for a bump test and BP EXPRD is set to NOT USE,

then the following screen displays.

FAIL

B--LIMIT

The GX-2012 cannot be used until a bump test has been performed by selecting BUMP in the Maintenance Mode menu. See “Performing a Bump Test” on page 111 for bump testing instructions.

• If a bump test is not due or BP EXPRD is set to NO EFFECT, then

the following screen appears for a few seconds indicating when the next bump test is due.

2011 9 30 10d

NEXTBUMP

NOTE: If both CL RMNDR and BP RMNDR are turned off, a WARM UP

screen will display before the warm up sequence continues.

76 • Start Up, Bar Hole Mode GX-2012 Operator’s Manual

8. If ID DISP is turned on (see page 135), the User ID Screen displays for a few seconds and then the Station ID Screen displays for a few seconds.

U Id

- - - - - - - -

S Id

- - - - - - - -

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

2011 8 31 22:39

DATE

This screen displays the current year, month, date, and time.

10. The Battery Level and Alarm Pattern Screen appears next.

bAtt

3.7

AL-H V

GX-2012 Operator’s Manual Start Up, Bar Hole Mode • 77

bAtt

3.7

AL-H D: V

11. The display then indicates the following items for about a second each:

• Full scale values for all channels

• Warning setpoint (low gas alarm) for all channels

• Alarm setpoint (high gas alarm) for all channels

• STEL alarm setpoint for the CO and H

• TWA alarm setpoint for the CO and H

S channels

12. If the GX-2012 experiences a sensor failure during start up, a screen indicating which sensor failed displays. In the example below, the combustible gas %volume sensor has failed.

CH4

FAIL

vol%

SENSOR

If one of the combustible sensors, LEL or % volume, fails, it is not possible to enter Bar Hole Mode. Press and release the RESET SILENCE button to acknowledge the failure and return to the Mode Select Screen. Replace the failed sensor as soon as possible.

If the oxygen sensor fails, press and release the RESET SILENCE button to acknowledge the failure and continue to Bar Hole Mode. The gas reading for the oxygen sensor will be replaced by “XXX”. Replace the failed sensor as soon as possible.

78 • Start Up, Bar Hole Mode GX-2012 Operator’s Manual

If the CO or H2S sensor is installed and fails, press and release the RESET SILENCE button to acknowledge the failure and continue to Bar

Hole Mode.

13. The GX-2012 is now operating in Bar Hole Mode. The pump is off and the following screen appears.

BAR HOLE MODE

CH4

001

20.9

%LEL

The methane and oxygen channels are displayed along with the battery charge level.

Performing a Fresh Air Adjustment, Bar Hole Mode

Before using the GX-2012, it is recommended to set the fresh air readings for the target gases by performing a fresh air adjustment. This will set the combustible gas channel to zero and the OXY channel to 20.9%.

1. Find a fresh-air environment. This is an environment free of toxic or combustible gases and of normal oxygen content (20.9%).

2. Turn on the unit as described above in “Turning On the GX-2012, Bar Hole Mode”.

3. Press and hold the AIRS button. The pump will start and the display will prompt you to hold the AIRS button.

4. Continue to hold the AIRS button until the display prompts you to release the AIRS button. The GX-2012 will set the fresh air reading for the CH

and oxygen channels as it counts down from 8. Once the

countdown has finished, start up is complete and the unit is ready for bar hole testing.

GX-2012 Operator’s Manual Start Up, Bar Hole Mode • 79

Bar Hole Testing

In Bar Hole Mode, the you can initiate sampling for a fixed time period to monitor for methane and oxygen in a bar hole. The factory set time is 30 seconds. To change the bar hole sampling time, see “Updating the Bar Hole Sampling Time” on page 138. At the end of the sample period, the pump will shut off and the peak methane and minimum oxygen levels monitored during the sample period will be displayed. Bar Hole Mode also allows you to initiate an air purge cycle to purge gas from the GX-2012 after a sample is taken.

In a low-light environment, press and release the (SHIFT)T button to turn on the display backlight. Although the backlight will turn on when any button is pressed, other buttons may initiate an undesired operation sequence. See “Updating the LCD Back Light Time Setting” on page 135 to program backlight duration. If BEEP. SET is turned on in the Maintenance Mode menu, the GX-2012 beeps once every 5 minutes to confirm that it’s operating.

While in Bar Hole Mode, you may select or change the current station ID by pressing the (SHIFT)T button and DISPLAY (ADJ) button and releasing when you hear a beep.

Performing a Bar Hole Test

1. Start up the GX-2012 as described in “Start Up, Bar Hole Mode” on page 73.

2. If you wish to change the station ID, press the (SHIFT)T and DISPLAY (ADJ) buttons and release when you hear a beep. The current station ID will be displayed and it will be flashing. If you wish to exit the Station ID Select Screen without making any changes, press and release the RESET SILENCE button.

S Id

SEL

001

80 • Bar Hole Testing GX-2012 Operator’s Manual

Use the AIRS and (SHIFT)T buttons to scroll to the desired station ID and press and release POWER ENTER. The unit will return to the Bar Hole Measuring Screen.

BAR HOLE MODE

CH4

001

0.0

%LEL

3. Take the GX-2012 to the bar hole that will be tested.

4. Insert the probe into the bar hole and press and release the POWER ENTER button. The pump will turn on and the sample period will begin with the sample period counting down in seconds in the lower right corner of the display. The CH

channel will be displayed in %VOL. The

methane channel’s reading will also be displayed in graph format on the left side of the screen. If you wish to cancel the measurement, press and release the RESET SILENCE button.

BAR HOLE MODE

CH4

MEASURE

20.9

vol%

sec

5. After 15 seconds of sampling, if the combustible gas reading is less than 5 %VOL, the combustible gas channel will automatically begin displaying in %LEL.

GX-2012 Operator’s Manual Bar Hole Testing • 81

6. At the end of the sample period, the pump will shut off and the buzzer will sound, then the peak methane reading and the minimum oxygen reading for the sample period will be displayed. The peak methane reading will also be visually displayed on the graph along the left side of the screen.

BAR HOLE MODE

CH4

PEAK

19.0

%LEL

7. If a high concentration of methane is encountered, a fresh air purge can be performed to purge the hose, probe and GX-2012 of gas before the next bar hole test. To perform a purge, do the following:

• Remove the probe from the barhole so the instrument will draw fresh

air.

• Press and release the DISPLAY (ADJ) button. The display will now

indicate PURGE along the bottom of the screen and the purge time will begin counting down from 30 seconds in the lower right corner of the display. If you wish to cancel the purge, press and release the RESET SILENCE button.

BAR HOLE MODE

CH4

PURGE

20.9

vol%

sec

• When the purge is complete, the screen will return to the initial Bar

Hole Mode screen.

BAR HOLE MODE

CH4

20.9

%LEL

001

82 • Bar Hole Testing GX-2012 Operator’s Manual

8. If other bar holes will be tested, proceed to the next bar hole and repeat steps 4 - 7.

9. To cancel a bar hole measurement or fresh air purge that is in progress, press and release the RESET SILENCE button.

10. To exit Bar Hole Mode and return to the Mode Select Screen at any time, press and hold the (SHIFT)T button for 5 seconds.

Turning Off the GX-2012, Bar Hole Mode

1. Press and hold the POWER ENTER button.

2. The unit will initiate a bar hole measurement. Keep holding the POWER ENTER button. The buzzer will pulse for about three seconds and TURN OFF will appear at the bottom of the screen.

3. Release the button when TURN OFF disappears.

GX-2012 Operator’s Manual Bar Hole Testing • 83

Chapter 5: Using the GX-2012 in Leak Check Mode

Overview

This chapter explains how to operate the GX-2012 in Leak Check Mode. Leak Check Mode is used to pinpoint small leaks of combustible gas from valves, flanges, connections, and other potential leak points. When the GX2012 is in Leak Check Mode, only the combustible channel is displayed.

If a GX-2012 is intended for leak check testing, it is shipped with Leak Check Mode enabled so that the operator must choose which operational mode to use when the unit is turned on (see “Turning On the GX-2012 in Normal Mode With All Modes Active” on page 25).

NOTE: In order to use the GX-2012 for Leak Check Mode operation, the

LEL/ppm sensor (NC-6264ALB) must be installed. The LEL sensor cannot be used.

Start Up, Leak Check Mode

This section explains how to start up the GX-2012 in Leak Check Mode and get it ready for operation.

NOTE: The battery drain is higher in Leak Check Mode than in Normal

Mode or Bar Hole Mode. Extended operation in this mode will result in shorter battery life than specified in “Specifications” on page 3.

Turning On the GX-2012, Leak Check Mode

WARNING: If an oxygen or H2S sensor is installed, these sensors will not

be active while the GX-2012 is in Leak Check Mode.

84 • Ove rview GX-2012 Operator’s Manual

NOTE: In order for LEAK CHECK MODE to appear as a selection in the

Mode Select Screen in Step 3 below, the L./B. MODE item in Maintenance Mode must be set to LC or LC bH. The factory setting is OFF.

1. Connect the tapered rubber nozzle to the inlet fitting.

2. If a sample hose is used, connect the sample hose to the GX-2012’s quick

connect inlet fitting.

NOTE: If a probe is used when using the GX-2012 in Leak Check Mode,

use the standard probe, not the bar hole probe.

3. Press and briefly hold down the POWER ENTER button. The Normal

Mode Select Screen displays.

vol%

CH4

H2S

NORMAL ?

20.9 0

0.0

%LEL

ppm

4. Use the AIRS or (SHIFT)T button to scroll to the Leak Check Mode

Select Screen.

LEAK CK MODE

CH4

L.C. MODE?

5000

ppm

LEAK CK MODE

CH4

L.C. MODE?

0 5000

ppm

CO DISP OFF CO DISP On

NOTE: If the CO DISP parameter in Maintenance Mode is set to On, the

CO channel will appear in Leak Check Mode. If the CO DISP parameter is set to OFF (factory setting), the CO channel will not appear in Leak Check Mode. All screens in this section do not show the CO channel. If CO DISP is turned on for your instrument, your screens may appear different.

5. With the Leak Check Mode Select Screen displayed, press and release the

POWER ENTER button to begin the Leak Check Mode startup sequence.

GX-2012 Operator’s Manual Start Up, Leak Check Mode • 85

NOTE: If no button is pressed for 20 seconds, the unit will proceed into

whichever mode is displayed.

6. If CL RMNDR is turned on (factory setting), the screen that appears next

depends on how CL EXPRD is set in the Maintenance Mode Menu (page 131).

• If the unit is due for calibration and CL EXPRD is set to CONFIRM (factory setting), then the following screen displays.

CAL

C--LIMIT

The alarm LED’s and buzzer will pulse several times. After this, press and release the RESET SILENCE button to continue.

• If the unit is due for calibration and CL EXPRD is set to NOT USE, then the following screen displays.

FAIL

C--LIMIT

The GX-2012 cannot be used until a calibration has been performed either by selecting AUTO CAL, or ONE CAL in the Maintenance Mode menu. See “Calibrating Using Auto Calibration” on page 105 or “Calibrating Using Single Calibration” on page 108 for calibration instructions.

86 • Start Up, Leak Check Mode GX-2012 Operator’s Manual

• If calibration is not due or CL EXPRD is set to NO EFFECT, then the following screen appears for a few seconds indicating when the next calibration is due.

2011 9 30 69d

NEXT CAL

7. If BP RMNDR is turned on (factory setting is OFF), the screen that appears next depends on how BP EXPRD is set in the Maintenance Mode Menu (page 133).

• If the unit is due for a bump test and BP EXPRD is set to CONFIRM

(factory setting), then the following screen displays.

tESt

B--LIMIT

The alarm LED’s and buzzer will pulse several times. After this, press the RESET SILENCE button until you hear a beep to continue.

• If the unit is due for a bump test and BP EXPRD is set to NOT USE,

then the following screen displays.

FAIL

B--LIMIT

The GX-2012 cannot be used until a bump test has been performed by selecting BUMP in the Maintenance Mode menu. See “Performing a Bump Test” on page 111 for bump testing instructions.

GX-2012 Operator’s Manual Start Up, Leak Check Mode • 87

• If a bump test is not due or BP EXPRD is set to NO EFFECT, then

the following screen appears for a few seconds indicating when the next bump test is due.

2011 9 30 10d

NEXTBUMP

NOTE: If both CL RMNDR and BP RMNDR are turned off, a WARM UP

screen will display before the warm up sequence continues.

8. If ID DISP is turned on, the User ID Screen displays for a few seconds and then the Station ID Screen displays for a few seconds.

U Id

- - - - - - - -

S Id

- - - - - - - -

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

2011 8 31 22:39

DATE

This screen displays the current year, month, date, and time.

88 • Start Up, Leak Check Mode GX-2012 Operator’s Manual

10.The Battery Level and Alarm Pattern Screen appears next.

bAtt

3.7

AL-H V

AL -- H indicates latching (hold) alarms and AL -- A indicates selfresetting (automatic) alarms. The number shown indicates the voltage of the batteries. If the unit is powered by alkaline (dry cell) batteries, a “D” will appear before the “V” in the lower right corner.

bAtt

3.7

AL-H D: V

11.The display then indicates the full scale values for all channels.

12.If the GX-2012 experiences a sensor failure during start up, a screen indicating which sensor failed displays. In the example below, the catalytic LEL sensor has failed.

CH4

SENSOR

If the catalytic LEL sensor fails, it is not possible to enter Leak Check Mode. Press and release the RESET SILENCE button twice to acknowledge the failure and return to the Mode Select Screen. Replace the failed sensor as soon as possible.

FAIL

%LEL

If the oxygen, CO, or H the RESET SILENCE button to acknowledge the failure and continue to

Leak Check Mode.

If a vol% sensor is installed and fails, no indication will be given and the

GX-2012 Operator’s Manual Start Up, Leak Check Mode • 89

S sensor is installed and fails, press and release

unit will enter Leak Check Mode.

13.The GX-2012 is now operating in Leak Check Mode.

LEAK CK MODE

CH4

F. S .

5000

ppm

The combustible gas reading is displayed along with the battery charge level.

Performing a Fresh Air Adjustment, Leak Check Mode

Before using the GX-2012 for leak checking, it is recommended to set the fresh air reading by performing a fresh air adjustment. This will set the combustible gas channel to zero.

1. Find a fresh-air environment. This is an environment free of toxic or combustible gases and of normal oxygen content (20.9%).

2. Turn on the unit as described above in “Turning On the GX-2012, Leak Check Mode” on page 84.

3. Press and hold the AIRS button. The display will prompt you to hold the AIRS button.

AIr CAL

HOLD AIR

4. Continue to hold the AIRS button until the display prompts you to release the AIRS button. The GX-2012 will set the fresh air reading for the combustible channel. Once the fresh air adjustment has finished, start up is complete and the unit is ready for leak testing.

5. If you would like to calibrate the GX-2012 while in Leak Check Mode, follow the same instructions described in “Calibration Mode” on page 57.

90 • Start Up, Leak Check Mode GX-2012 Operator’s Manual

Leak Testing

In Leak Check Mode, the GX-2012 only displays combustible gas readings. The increment of the reading is always 100 ppm but the display range can be adjusted by using the DISPLAY (ADJ) button. The display range choices are 500 ppm, 1000 ppm, 2000 ppm, and 5000 ppm. The readings are displayed in both numerical and bar graph form. As the gas concentration increases from 0 ppm, the alarm LEDs begin to blink in unison with the buzzer’s pulsing. The blinking/pulsing rate increases as the gas reading increases. If desired the buzzer can be turned off in Leak Check Mode.

In a low-light environment, press and release any of the buttons to turn on the display backlight. If BEEP. SET is turned on in Maintenance Mode, the GX- 2012 beeps once every 5 minutes to confirm that it’s operating.

Setting the Display Range Value

The GX-2012 Leak Check Mode has 4 display range ppm values to choose from: 500 ppm, 1000 ppm, 2000 ppm, and 5000 ppm.

NOTE: The GX-2012 is always detecting combustible gas up to 5000 ppm.

The display range value is only adjusting what part of the detection range is displayed on the LCD.

To change the display range value:

1. While in Leak Check Mode, press and release the DISPLAY (ADJ) button. The display range value displayed along the bottom of the screen will change.

LEAK CK MODE

CH4

F. S .

500

ppm

Continue to press and release the DISPLAY (ADJ) button until the desired display range value is displayed.

2. The unit is now operating with the selected display range.

Locating a Leak

1. Start up the GX-2012 as described above in “Turning On the GX-2012, Leak Check Mode” on page 84.

GX-2012 Operator’s Manual Leak Testing • 91

2. Move the probe tip or tapered nozzle tip back and forth along the area where a leak is suspected.

3. Observe the display reading. If the gas level increases, the numerical reading will increase, the bar graph level will increase, and the beeping and buzzer pulsing frequency will increase.

4. Your gas reading may exceed your display range or 100% LEL. For a description of both scenarios, see the following section.

5. Use the increasing and decreasing of the reading to locate the leak point.

6. To exit Leak Check Mode and return to the Leak Check Mode Select Screen at any time, press and hold the (SHIFT)T button for 5 seconds.

Overscale Conditions

There are three overscale conditions that the GX-2012 may experience while operating in Leak Check Mode.

• Exceeding display range

If you are using a display range of 500, 1000, or 2000 ppm and the gas level goes above the display range, the full scale value of the display range will be displayed but it will not be an overscale condition unless the gas level is above 5000 ppm.

• Exceeding 5000 ppm

If the combustible gas level exceeds 5000 ppm, the GX-2012 will display an overscale condition but will continue displaying the gas reading in %LEL.

LEAK CK MODE

CH4

OVER

5000

%LEL

ppm

92 • Leak Testing GX-2012 Operator’s Manual

RKI Instruments GX-2012 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual