RKI Instruments GasWatch 2 User manual

www.rkiinstruments.com
GasWatch 2
Operator’s Manual
Part Number: 71-0065RK
Revision: F
Released: 2/2/11

GasWatch 2 Operator’s Manual
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 cor-
rect 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.

GasWatch 2 Operator’s Manual Warranty
Warranty RKI Instruments, Inc. warrants the GasWatch 2 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. 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.
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. INNO 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.
Absorbent cartridges
Filter elements, disks, or sheets
Pump diaphragms and valves

Table of Contents GasWatch 2 Operator’s Manual
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wristband . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Sensor Cap/.Sensor Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Charcoal Filter Disk in GW-2C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LCD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Printed Circuit Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Alarm Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Buzzer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Vibrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Lithium Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Start Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Start-up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Performing a Fresh Air Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Turning Off the GasWatch 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Measuring Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Displaying the Peak, STEL, & TWA (GW-2C & GW-2H) . . . . . . . . . . . . . . . . . . 11
Displaying Min and Max (GW-2X). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Displaying and Setting the Alarm Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Setting the Fresh Air Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Setting the Span (Zero for GW-2X). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

GasWatch 2 Operator’s Manual Table of Contents
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Replacing the Lithium Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Replacing the Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Replacing the Sensor Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Replacing the Charcoal Filter Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Replacing the Wristband. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Appendix A: MRI Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
WARNING: Understand manual before operating. Substitution of
components may impair intrinsic safety. To prevent
ignition of a hazardous atmosphere, batteries must only
be changed in an area known to be nonhazardous. Not
tested in oxygen enriched atmospheres (above 21%).

1 • Introduction GasWatch 2 Operator’s Manual
Introduction
Using an advanced microprocessor controlled detection system, the
GasWatch 2 Personal Single-Gas Monitor detects the presence of either
carbon monoxide (CO), hydrogen sulfide (H2S), or oxygen (O2). The
GasWatch 2’s compact size and easy-to-use design makes it ideally suited
for a wide range of applications, including sewage treatment plants,
tunnels, hazardous waste sites, petrochemical facilities, oil fields, mines,
and chemical plants. The GasWatch 2 is even small enough to be worn
comfortably on the wrist like a watch. The GasWatch 2 offers a full range of
features, including:
• Hands free gas monitoring
• Compact “watch type” design
• Fast, accurate response with digital liquid crystal display (LCD)
• Visual, audible, and vibration alarms
• Microprocessor control for reliability, ease of use, and advanced
capabilities
• Peak, STEL, and TWA indication for GW-2C & GW-2H
• Minimum and maximum indication for GW-2X
• STEL, TWA, and over range alarms
• Sensor fail alarm
• Displays current time
• Over 3,000 hours of operation from 1 battery
• CSA classified for Class I, Division I, Groups A, B, C, and D hazardous
atmospheres
WARNING: The GasWatch 2 detects carbon monoxide, hydrogen
sulfide, or oxygen deficiency and elevated levels of
oxygen, all of which can be dangerous or life threatening.
When using the GasWatch 2, 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 calibrate
the GasWatch 2 as described in this manual.

GasWatch 2 Operator’s Manual Specifications • 2
Specifications
Table 1: GasWatch 2 Specifications
GW-2C GW-2H GW-2X
Target Gas Carbon Monoxide
(CO) Hydrogen Sulfide (H2S) Oxygen (O2)
Detection Range 0 to 500 ppm 0 to 100.0 ppm 0 to 40.0% vol.
Display Increment 1 ppm 0.5 ppm 0.1% vol.
Detection
Principle Electro Chemical Electro Chemical Galvanic Cell
Alarm Points Low 25 ppm
High 50 ppm
TWA 25 ppm
STEL 200 ppm
Low 10.0 ppm
High 30.0 ppm
TWA 10.0 ppm
STEL 15.0 ppm
Low 19.5% vol.
(decreasing)
High 23.5% vol.
(increasing)
Sampling Method Diffusion Diffusion Diffusion
Response Time T90 in 30 seconds T90 in 30 seconds T90 in 20 seconds
Accuracy ±5% of reading or
± 5 ppm CO
(whichever is
greater)
±5% of reading or
± 2 ppm H2S
(whichever is
greater)
± 0.5% O2
Safety/Regulatory
C US
186718
CSA classified, “C/US”, as Intrinsically Safe. Exia. Class I,
Groups A, B, C, & D. Class I, Zone 0, Group IIC.
Temperature Code T4.
Power Two AAA size Alkaline Batteries Standard, Duracell MN2400
or PC2400, Eveready Energizer E92 or EN92
Continuous
Operating Hours Approximately 3,000 Hours With No alarms or Backlighing
Case High-impact Plastic, Dust Proof and Weather Resistant
Standard
Accessory Wristband

3 • Specifications GasWatch 2 Operator’s Manual
Optional
Accessories • Belt Clip
• Hard Hat Clip
• Lapel Clip
Dimensions and
Weight Dimensions: 2.5 (H), 1.7 (W), 0.9 (D) inches Weight: 2 oz.
OperatingTemp.&
Humidity -10°C - 40°C, below 85% RH (non condensing)
Table 1: GasWatch 2 Specifications
GW-2C GW-2H GW-2X

GasWatch 2 Operator’s Manual Description • 4
Description
This section describes the components of the GasWatch 2. These
components include the GasWatch 2’s case, wristband, sensor cap and
sensor cover, charcoal filter disk (in the GW-2C), sensor, LCD, control
buttons, printed circuit boards, alarm lights, buzzer, vibrator, and lithium
battery.
Sensor Diffusion
Port
LCD Display Window
Alarm LED Lens
Buzzer Opening
Wristband
Control Buttons
Sensor Cap
AIR
POWER
MODE
Figure 1:Components of the GasWatch 2

5 • Description GasWatch 2 Operator’s Manual
Case
The GasWatch 2’s sturdy, high-impact plastic case is suitable for use in
many environmental conditions, indoors and out. The unit is dust proof and
weather resistant. The case has two halves, the top case and the bottom
case. They are held together by four screws in the bottom case. The case
is a different color depending on the model. The GW-2C for CO is red, the
GW-2H for H2S is orange, and the GW-2X for oxygen is blue.
The digital LCD is visible through the top case. It displays gas
concentrations, battery level, time, and other readings including TWA,
STEL, and peak gas levels. Below the LCD are two black control buttons.
The button on the left is labeled POWER/MODE. The button on the right is
labeled AIR.
To the left of the LCD is the buzzer, which is located inside the unit. To the
right of the LCD is the sensor cap which retains the sensor. Above the LCD
is a frosted lens through which the alarm lights are visible.
A battery cover is located on the bottom case and is held in place by two
screws. The wristband attaches to the bottom case.
Wristband
The GasWatch 2 comes with a wristband as a standard accessory so the
unit may be worn as a watch and allow hands-free gas monitoring. The
wristband is held in place with the same type of spring bars that are used in
a watch. The spring bars are protected by hollow tubes which fit into the
wristband. Optional accessories are available from RKI Instruments, Inc.
that can be used in place of the wristband such as a belt clip.
Sensor Cap/Sensor Cover
The sensor cap snaps onto the right side of the case and retains the
sensor. It also retains the sensor cover which is a round hydrophobic disk
membrane which protects the sensor from dirt and weather. A gasket
installed on the sensor seals against the sensor, sensor cover, and sensor
cap.
Charcoal Filter Disk in GW-2C
The GW-2C includes a charcoal filter disk which is located in a recessed
area of the sensor gasket beneath the sensor cover. The charcoal filter disk
removes gases from the sampled air that will cause a response on the CO
sensor such as H2S and certain hydrocarbons. If false or elevated CO
readings are noticed, especially in the presence of H2S, change the
charcoal filter disk (see the Maintenance section for instructions).