RKI Instruments GX-2012 Operating Manual
GX-2012
Operator’s Manual, CSA Version
Part Number: 71-0239RK
Revision: R
Released: 10/1/18
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 essen-
tial 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, CSA Version
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:
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.
Absorbent cartridges
Filter elements, disks, or sheets
Pump diaphragms and valves
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, CSA Version
Table of Contents
Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
About the GX-2012. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Instrument Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Case. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
LCD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Printed Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Alarm LED Arrays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Infrared Communications Port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Buzzer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Vibrator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Flow Chamber. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Sensors and Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Inlet Filter Holder. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Standard Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Tapered Rubber Nozzle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Belt Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Wrist Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Sample Hose & 10 Inch Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Charging Stations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Optional Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Purge Tee Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
External Dilution Fitting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Chapter 3: Using the GX-2012 in Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Start Up, Normal Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Turning On the GX-2012, Normal Mode Only . . . . . . . . . . . . . . . . . . . . . . . . . 24
Turning On the GX-2012 in Normal With All Modes Active . . . . . . . . . . . . . . 29
Performing a Fresh Air Adjustment, Normal Mode . . . . . . . . . . . . . . . . . . . . . . 31
Turning Off the GX-2012, Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Measuring Mode, Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Monitoring an Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Using Optional Probes and Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Combustible Gas Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
GX-2012 Operator’s Manual, CSA Version Table of Contents
Snap Log Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Measuring Mode, Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Alarm Indications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Resetting and Silencing Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Responding to Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Inert Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Start Up and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
HC Range Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Peak Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
STEL Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
TWA Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Alarm Points Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Operation Time Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Date/Time Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Remaining Log Time Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Clear Data Logger Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Pump Off Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
User ID Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Station ID Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Snap Logging Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Peak Bar Select Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Datalogging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
SDM-2012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Calibration Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Calibration/Bump Test Supplies and Equipment. . . . . . . . . . . . . . . . . . . . . . . . . 57
Preparing for Calibration or Bump Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Calibrating the GX-2012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Bump Testing the GX-2012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Chapter 4: Using the GX-2012 in Bar Hole Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Start Up, Bar Hole Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Turning On the GX-2012, Bar Hole Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Performing a Fresh Air Adjustment, Bar Hole Mode . . . . . . . . . . . . . . . . . . . . . 76
Bar Hole Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Performing a Bar Hole Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Turning Off the GX-2012, Bar Hole Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Chapter 5: Using the GX-2012 in Leak Check Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Start Up, Leak Check Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Turning on the GX-2012, Leak Check Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Performing a Fresh Air Adjustment, Leak Check Mode . . . . . . . . . . . . . . . . . . . 85
Leak Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
Setting the Display Range Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Locating a Leak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Overscale Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Table of Contents GX-2012 Operator’s Manual, CSA Version
Turning the Alarm On and Off in Leak Check Mode . . . . . . . . . . . . . . . . . . . . . 88
Peak Hold Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Snap Log Mode, Leak Check Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Viewing Snap Log Data in Leak Check Mode Operation. . . . . . . . . . . . . . . . . . . 91
Turning Off the GX-2012, Leak Check Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Chapter 6: Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95
Tips for Using Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Using Maintenance Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Updating the Date and Time Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Performing a Fresh Air Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Calibrating Using Auto Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Calibration Using Single Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Performing a Bump Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Turning the Lunch Break Setting On or Off . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Updating the Alarm Latching Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Updating the Alarm Silence Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Updating the Data Logging Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Updating the Alarm Point Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Turning the Clear Data Logger Screen On or Off. . . . . . . . . . . . . . . . . . . . . . . 116
Turning the Bump Test Function On or Off . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Turning the Pump Off Screen On or Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Updating the Bump Test Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Updating the Confirmation Beep Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Updating the DataLog Overwrite Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Updating the Calibration Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Updating the Calibration Reminder Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Updating the Calibration Expired Action Setting . . . . . . . . . . . . . . . . . . . . . . . 121
Updating the Calibration Check Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Updating the Bump Test Interval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Updating the Bump Test Reminder Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Updating the Bump Test Expired Action Setting . . . . . . . . . . . . . . . . . . . . . . . 123
Updating the Bump Test Check Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Turning the ID Display Function On or Off. . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Updating the LCD Backlight Time Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Updating the Autozero Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Updating the Demand Zero Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Updating the Leak Check/Bar Hole Mode Setting . . . . . . . . . . . . . . . . . . . . . . . 127
Updating the Bar Hole Sampling Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Turning Portuguese On or Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Updating the Leak Check Mode CO Channel Display Setting . . . . . . . . . . . . . 129
Viewing the ROM/SUM Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Turning the Password Function On or Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Performing a Low Flow Setpoint Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Exiting Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
GX-2012 Operator’s Manual, CSA Version Table of Contents
Chapter 7: Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Replacing or Recharging the Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Replacing Alkaline Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Replacing the Lithium Ion Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Recharging the Lithium Ion Battery Pack in the Instrument . . . . . . . . . . . . . . 138
Recharging the Lithium Ion Battery Pack Out of the Instrument. . . . . . . . . . . 141
Replacing the LEL and CO Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Replacing a Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Replacing the Hydrophobic Disk Filter, Cotton Filter,
and Wire Mesh Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Appendix A: Calibrating and Bump Testing
with a Sample Bag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Calibration/Bump Test Supplies & Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Preparing for Calibration or Bump Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Calibrating the GX-2012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Calibrating with the Auto Calibration Method . . . . . . . . . . . . . . . . . . . . . . . . . 154
Calibrating with the Single Calibration Method . . . . . . . . . . . . . . . . . . . . . . . . 157
Bump Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
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%).
Table of Contents GX-2012 Operator’s Manual, CSA Version
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 (O2), carbon
monoxide (CO), and hydrogen sulfide (H2S) 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:
• Simultaneous four-gas monitoring of combustible gases, O2, CO, and H2S (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
• Peak hold and average readouts (when used in Normal Mode)
• Built-in time function
• RF shielded high impact plastic case
• CSA classification 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 in stru cti ons an d w arnin gs in th is m anual to as sure
proper and safe operation of the unit and to minimize the risk of
personal injury. Be sure to maintain and periodically calibrate the GX2012 as described in this manual.
8 • Overview GX-2012 Operator’s Manual, CSA Version
NOTE: ONLY THE COMBUSTIBLE GAS DETECTION PORTION OF THIS
INSTRUMENT HAS BEEN ASSESSED FOR PERFORMANCE.
GX-2012 Operator’s Manual, CSA Version About the GX-2012 • 9
Specifications
Table 1: GX-2012 Specifications
Tar ge t Ga s %L EL
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 (O
) Hydrogen
2
Sulfide
(H
S)
2
(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
2
± 5% of
reading or
± 2 ppm H
(whichever
is greater)
Alarm 1
5 ppm
Alarm 2
30 ppm
TWA
1 ppm
STEL
5 ppm
S
2
± 5% of
reading or
± 5 ppm
CO
(whichever
is greater)
Alarm 1
25 ppm
Alarm 2
50 ppm
TWA
25 ppm
STEL
200 ppm
10 • Specifica tions GX-2012 Operator’s Manual, CSA Version
Safety/
Regulatory
186718
CSA classified as Intrinsically Safe. Exia. Class I, Groups A, B, C, & D.
Temperature Code T3A.
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
• Product CD, includes 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 166)
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.
GX-2012 Operator’s Manual, CSA Version About this Manual • 11
Chapter 2: Description
In l et F itting
Exhaust
Tapered
Rubber
Nozzle
Battery
Cover
(alkaline
version)
Charging
Contacts
Inlet Fi lter
Holder
Buz zer
Opening
RESET
SILENCE
DISPLAY
(ADJ)
AIR
(SHIFT)
POWER
ENTER
Wrist Strap Installation Feature
IR Port
(behind
button label)
Flow
Chamber
Control
Buttons
LCD
Alarm
LED
Arrays
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.
Figure 1: Components of the GX-2012, Front & Back
12 • Ove rview GX-2012 Operator’s Manual, CSA Version
Case
Rechargeable Version
Battery Pack
Battery Pack
Release Latch
Battery Cover
Release Knob
Alkaline
Version
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 GX-2012 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 (O2), carbon
monoxide (CO), and hydrogen sulfide (H
inside the GX-2012 and are held in their sockets by the flow chamber. The sensors use
different detection principles, as described below.
Combustible Gas Sensors
Figure 2: Components of the GX-2012, Bottom
S) simultaneously. The sensors are located
2
% LEL/ppm Sensor (NC-6264B)
The % LEL/ppm sensor detects combustible gas in the % LEL and ppm 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.
GX-2012 Operator’s Manual, CSA Version Instrument Description • 13
%Volume Sensor (TE-7561)
Bottom
Hollow Side
Dummy Sensor
Top F l at
Side
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
GX-2012’s circuitry, converted to a measurement of gas concentration, and displayed on
the LCD.
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/O2/H2S/CO and has a dummy sensor installed in the
%volume combustible sensor position.
Figure 3: Dummy Sensor
14 • Instrument Desc ription GX-2012 Operator’s Manual, CSA Version
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.
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 AIR button on the top, and the (SHIFT) 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
1
AIR • activates the demand-zero function (automatically adjusts the
GX-2012 in fresh-air conditions)
• scrolls through the display and settings modes
(SHIFT) • 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 95.
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 GX-2012 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, CSA Version Instrument Description • 15
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 GX-2012 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 136.
WARNING: To prevent ignition of a hazardous atmosphere, batteries must only be
changed or charged in an area known to be nonhazardous.
AVERTISSEMENT:Pour éviter l’inflammation d’une atmosphère dangereuse, les
batteries doivent uniquement être modifiés ou facturés dans une zone
connue comme non dangereuse.
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).
16 • Instrument Desc ription GX-2012 Operator’s Manual, CSA Version
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 H2S removal filter disk is placed into a recess in the sensor gasket over the %LEL
sensor. It prevents H2S in the ambient air from reaching the unit’s combustible gas sensor.
Removing H2S that is present in the monitored air prolongs the life of the sensor. The H2S
filter disk is dark red in color and although it may darken over time, its color is not
indicative of remaining filter life. The H
and should be replaced after that much exposure. With this many ppm hours of absorption,
the H
equates to replacing the H2S filter disk after 40 2-minute calibrations with a cylinder
containing 25 ppm H2S. If H2S exists in the monitoring environment, the H2S filter disk
will have to be replaced more frequently.
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
material. The CO sensor will respond if exposed to H2S and certain hydrocarbon gases.
The charcoal filter disk scrubs these gases out of the sample to avoid false CO readings. If
false or elevated CO readings are noticed, especially in the presence of H
charcoal filter.
S filter disk should be replaced after 80 minutes of exposure to 25 ppm H2S. This
2
S filter disk can absorb H2S for 33 ppm hours
2
S absorbing
2
S, change the
2
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 GX-2012’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.
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.
GX-2012 Operator’s Manual, CSA Version Standard Accessories • 17
Sample Hose & 10 Inch Probe
SampleHose
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 148). 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.
Figure 4: Sample Hose and Probe
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 148 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.
18 • Optional Accessories GX-2012 Operator’s Manual, CSA Version
AC Powered Charging Station
Charging
Contacts
Charge LED
AC Adapte r
To AC
Outlet
Adapter Jack
Adapter Jack
Top
ViewRear View
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.
Figure 5: GX-2012 AC Powered Charging Station
GX-2012 Operator’s Manual, CSA Version Optional Accessories • 19
DC Powered Charging Station
Charging
Contacts
Adapter Jack
To Vehicle
12 VDC
Power Socket
Vehicle Plug
Adapter Jack
Rear View
Charge LED
Top
View
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.
Figure 6: GX-2012 DC Powered Charging Station
20 • Optional Accessories GX-2012 Operator’s Manual, CSA Version
Optional Probes
End Plugged
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
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 71). 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.
• 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.
GX-2012 Operator’s Manual, CSA Version Optional Accessories • 21
• 7 foot telescoping probe with dust filter
GX-2012 I nl et
Pressurized
Stream
Sample Port
Excess
Pressurized
Sample
Vent Port
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
Figure 12: 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 148 for probe ordering information.
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.
Figure 13: Purge Tee Fitting
22 • Optional Accessories GX-2012 Operator’s Manual, CSA Version
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 H2S.
Figure 14: Dilution Fitting
GX-2012 Operator’s Manual, CSA Version Optional Accessories • 23
Chapter 3: Using the GX-2012 in Normal Mode
rESU
4
RESUME
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.
4. If LNCH BRK is turned on, the Resume Datalog Screen displays.
• 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 GX-2012 is turned on.
• Press and release the DISPLAY(ADJ) button to reset the accumulation of these
measurements.
24 • Ove rview GX-2012 Operator’s Manual, CSA Version
If you do not press the POWER ENTER or DISPLAY(ADJ) button within 5 seconds,
CAL
C--LIMIT
FAIL
C--LIMIT
2011
9
30
69d
NEXT CAL
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 121).
• If the unit is due for calibration and CL EXPRD is set to CONFIRM (factory
setting), then the following screen displays.
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 calibration and CL EXPRD is set to NOT USE, then the
following screen displays.
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 99 or “Calibrating Using Single
Calibration” on page 102 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.
GX-2012 Operator’s Manual, CSA Version Start Up, Normal Mode • 25
6. If BP RMNDR is turned on (factory setting is OFF), the screen that appears next
tESt
B--LIMIT
FAIL
B--LIMIT
2011
9
30
10d
NEXTBUMP
depends on how BP EXPRD is set in the Maintenance Mode Menu (page 121).
• If the unit is due for a bump test and BP EXPRD is set to CONFIRM (factory
setting), then the following screen displays.
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.
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 104 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.
NOTE: If both CL RMNDR and BP RMNDR are turned off, a WARM UP screen will
display before the warm up sequence continues.
26 • Start Up, Normal Mode GX-2012 Operator’s Manual, CSA Version
7. If ID DISP is turned on (see page 125), the User ID Screen displays for a few seconds
U Id
- - - - - - - -
S Id
- - - - - - - -
2011
8
31
22:39
DATE
and then the Station ID Screen displays for a few seconds.
8. The Date/Time Screen appears for a few seconds.
This screen displays the current year, month, day, and time.
GX-2012 Operator’s Manual, CSA Version Start Up, Normal Mode • 27
9. The Battery Level and Alarm Pattern Screen appears next.
bAtt
3.7
AL-H V
bAtt
3.7
AL-H D: V
AL -- H indicates latching (hold) alarms and AL -- A indicates self-resetting
(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.
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 H2S channels
• TWA alarm setpoint for the CO and H2S channels
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.
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 acknowledgment screen will not
appear.
28 • Start Up, Normal Mode GX-2012 Operator’s Manual, CSA Version
11. If the GX-2012 experiences a sensor failure during start up, a screen indicating which
FAIL
ppm
SENSOR
CO
0
20.9
0
0.0
%LEL
%
ppm
ppm
CH4
O2
22:37
CO
H2S
sensor failed displays. In the example below, the CO sensor has failed.
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.
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 127), 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 71 for a description of Bar Hole Mode or “Chapter 5: Using the GX-2012 in Leak
Check Mode” on page 80 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 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.
GX-2012 Operator’s Manual, CSA Version Start Up, Normal Mode • 29
3. Press and briefly hold down the POWER ENTER button. The Normal Mode Select
0
20.9
0
0.0
vol%
%LEL
%
ppm
ppm
CH4
O2
NORMAL ?
CO
H2S
0
20.9
30
vol%
%LEL
%
BAR HOLE MODE
sec
CH4
O2
B.H. MODE?
CO DISP OFF CO DISP On
0
5000
ppm
ppm
LEAK CK MODE
CH4
L.C. MODE?
0
0
5000
ppm
ppm
ppm
LEAK CK MODE
CH4
L.C. MODE?
CO
Screen displays.
4. You can use the AIR button to scroll to the Bar Hole Mode Select Screen.
5. Press the AIR button again to display the Leak Check Mode Select Screen.
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 80 for more
information.
You can scroll up or down through these screens using the AIR or (SHIFT)
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 24 on.
30 • Start Up, Normal Mode GX-2012 Operator’s Manual, CSA Version
NOTE: If no button is pressed for 20 seconds, the unit will proceed into whichever
7. To exit Normal Mode and return to the Mode Select Screen, press and hold the
mode is displayed.
(SHIFT) button for 5 seconds while in the Normal Operation Screen.
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