Model GP-01
Combustible Gas Monitor
Operator’s Manual
Part Number: 71-0083RK
Revision: D
Released: 2/2/11
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.
Model GP-01 Operator’s Manual
Warranty
RKI Instruments, Inc. warrants the Model GP-01 Single LEL Gas Monitor
sold by us to be free from defects in materials, workmanship, and
performance fo r a period of two (2) years from the date of sh ipment from
RKI Instruments, Inc. This includes the instrument and the original sensor.
Replacement parts are warranted for one (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 as follows:
Absorbent cartridges
Filter elements, disks, or sheets
Pump diaphragms and valves
Warranty is voided by abuse including mechanical damage, alteration,
rough handling, o r r epair procedures no t in accordance with t he i nstr u ction
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 indemn ification 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.
Model GP-01 Operator’s Manual Warranty
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Protective Rubber Boots. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Alligator & Belt Clips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Membrane Retainer and Filter Disks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Sensor Retainer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Combustible Gas Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LCD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Control Buttons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Printed Circuit Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Alarm Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Buzzer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Vibrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Start Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Start-up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Performing a Fresh Air Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Turning Off the Model GP-01 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Measuring Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Displaying the Peak Gas Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Combustible Gas Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Alarm Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Displaying and Adjusting the Alarm Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Calibration Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Setting the Fresh Air Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Setting the Span Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table of Contents Model GP-01 Operator’s Manual
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Replacing or Charging the Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Replacing the Combustible Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Replacing the Sensor Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
WARNING: Understand this manual before operating the Model GP-
01. 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. This unit has not been tested
in an oxygen enriched atmosphere (above 21%).
Model GP-01 Operator’s Manual Table of Contents
Introduction
Using an advanced microprocessor controlled d etection system, the Model
GP-01 Single LEL Gas Monitor detects the presence of combustible gas
(e.g., methane, CH4) as a percentage of LEL (lower explosive limit). The
Model GP-01’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 Model GP-01 is even small enough to be placed
conveniently in a p oc ket. The Model GP-01 offers th e following features:
• Compact design
• Fast, accurate response with digital liquid crystal display (LCD)
• Visual, audible, an d vibration alarms
• Microprocessor control for reliability, ease of use, and advanced
• Peak readings
capabilities
• Gas, battery, sensor failure, and system failure alarms
• CSA certified for intrinsic safety in Class I, Division I, Groups A, B, C,
and D hazardous atmospheres
WARNING: The Model GP-01 detects combustible gas, which can be
dangerous or life threatening. When using the Model GP01, 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 GP-01 as described in this
manual.
1 • Introduction Model GP-01 Operator’s Manual
Specifications
Table 1: Model GP-01 Specifications
Target Gas Combustible Gas, Methane (CH4) Calibration Standard
Detection Range 0-100% LEL (1% LEL Increments)
Detection Principle Catalytic Combustion Method
Sampling Type Diffusion
Response Time T90 in 30 seconds
Accuracy ± 5% of reading or ± 2 LEL (whichever is greater)
Indication 7-Segment Digital LCD
Gas Alarms
(Factory Settings)
Other Alarms Sensor Failure, Low Battery, Dead Battery, System Failure, and
Operating Temperature &
Humidity
Power Supply • Two AAA size Alkaline Batteries Standard, Duracell MN2400 or
Continuous Operating Time • Alkaline Batteries: 16 Hours Minimum at 25°C, No Alarms or
Features • Manual Backlight on LCD (Automatic Lighting at Alarm)
Standard Accessories • Wrist Strap
Optional Accessories • Ni-cad Battery Pack
• Low Alarm: 10% LEL
• High Alarm: 50% LEL
• Over Range: 100% LEL
Calibration Failure
- 20°C — 50°C, Below 90% RH (Non-condensing)
PC2400, Eveready Energizer E92 or EN92
• 2.4 Volt Ni-cad Battery Pack 49-1603RK Optional
Backlighting
• Ni-cad Battery Pack: 8 Hours Minimum at 25°C When Fully
Charged, No Alarms or Backlighting
•Peak Hold
• Direct Charging (Ni-cad Battery)
• Rubber protective boots
• Battery Charger for Ni-cad Battery Pack
• Calibration Adapter
• Calibration Kit
• Alligator Clip
•Belt Clip
Safety/Regulatory
C US
186718
CSA certified, “C/US”, as Intrinsically Safe. Exia. Class I, Div. 1,
Groups A, B, C, & D. Temperature Code T3C.
Dimensions and Weight 1.4” (35mm) W x 4.1” (104mm) H x 0.8” (20mm) D; 2.8 oz. (80 g)
Model GP-01 Operator’s Manual Specifications • 2
Description
d
This section describes the components of the Model GP-01. These
components i nclu de the GP-0 1’ s pro tective rubb er bo ot s, case, me mbran e
retainer and filter disks, sensor retainer, sensor, LCD, control buttons,
printed circuit boards, alarm lights , buzzer, vibrator, and batteri es.
Alarm Lights
Buzzer Opening
Membrane
Retainer
Sensor En
Boot
Sensor
Retainer
POWER
MODE
GP-01
%LEL
AIR
LCD
Control Buttons
Battery Charging
Contacts
Battery Cover
Threaded
Inserts
Battery End
Boot
Figure 1: Components of the GP-01
3 • Description Model GP-01 Operator’s Manual
Protective Rubber Boots
A protective rubber boot is installed over each end of the GP-01. The
sensor end boot fits over the sensor cover end of the GP-01 and the
battery end boot fits over the battery cover end of the GP-01. If you have a
Ni-cad battery pack in your GP-01, you must remove the battery end boot
to insert the GP-01 in the charger.
Case
The Model GP-01’s sturdy, high-impact plastic case is blue in color. The
case is suita ble for use in m any en viro nmen ta l con dition s, in door s and out.
The unit is dust proof and weather resistant.
The front of the case has an L CD (liqui d crystal display) tha t shows various
readings, which are described under “LCD” in this section. To the left of the
LCD is an alarm light. Below the LCD are two black control buttons. The left
button is labeled “POW ER /M OD E” and the right button is labeled “AIR ”.
On top of the case and to the left is the Model GP-01’s buzzer, which is
located inside the unit. To the right of the buzzer is the sensor. The sensor
is held in place by the sensor retainer (the top of the case for the Model
GP-01) and two screws. The sensor is protected from dirt and moisture by
a filter disk. This filter is secured by a membrane retainer and a single
screw. To the left of the sensor and below the buzzer, is a second alarm
light, which is also visible from the front of the case.
The battery compartment is located on the bottom of the case. Access to
the compartment is accomplished by turning the captive battery cover
screw counterclockwise and by removing the battery compartment door.
There are two threaded holes on the back of the case. These are used to
mount the optional alligator clip or belt clip. Toward the bottom of the back
are two battery charging contacts. These contacts are used when the
Model GP-01 is placed in its optio nal battery cha rging stat ion whene ver the
unit’s optional Ni-cad battery pack requires recharging.
The wrist strap connects to the back of the case on the left side, near the
top of the unit.
Model GP-01 Operator’s Manual Description • 4
Alligator and Belt Clips
The GP-01 is avai lable wit h two typ es of clip s, the a lliga tor c lip an d the bel t
clip. Both are illustrated in Figure 2 below.
Belt Clip
Alligator Clip
Figure 2: Alligator & Belt Clips
The alligator clip can be used to attach the GP-01 to clothing or a belt.
Teeth in the clip’s jaws prevent the unit from slipping off. The belt clip is
used to easily clip the GP-01 on a belt.
Membrane Retainer and Filter Disks
The membrane retainer is held in place by a single Phillips screw. Two
types of paper-like filter disks may be installed beneath the membrane
retainer. The smaller of the two, the H2S scrubber filter disk, removes H2S
from the air. The larger on e, the sen sor cover, protects the sensor from dirt
and moisture.
The H2S scrubber filter disks are not inst alled in the GP-01 as shippe d from
the factory. They can be installed to protect the combustible gas sensor
from H2S exposure if H2S will be present in the monitoring area.Two H2S
scrubber filter disks fit into a recessed area in the sensor retainer directly
above the sensor. If installed, they prevent 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. These filters are whi te
when new and darken as they absorb H2S. They must be changed when
5 • Description Model GP-01 Operator’s Manual
they turn dark brown. Freq uency of re placement depends on how o ften th e
Model GP-01 is exposed to H2S and on the concentration of H2S in the
environment. If installed, check the c ondition of the H2S scrubber filter
disks every three months.
NOTE: See “Combustible Gas Detection” on page 11 for a discussion of
when the H2S scrubber disks should be used and how they affect
detection of certain gases.
The sensor cover fits into a larger recessed area and covers the two H2S
scrubber filter disks (if installed). It is held in place by the membrane
retainer and one Phillips screw. The sensor cover should be inspected
periodically and replaced if contaminated by dirt or moisture. Refer to
“Maintenance” on page 21 for H2S scrubber and sensor cover replacemen t
instructions.
Sensor Retainer
The sensor retainer holds the combustible gas sensor in place. It is
attached to the top of the case by two Phillips screws. The sensor retainer
also covers the buzzer.
Should the combustible gas sensor require replacing, refer to the
Maintenance section for sensor replacement instructions. The buzzer,
however, is not field replaceable.
The sensor retainer has a single diffusion port through which ambient air
reaches the combustible gas sensor. A recessed area in the sensor
retainer accepts two H
S scrubber filter disks and the sensor cover, which
2
covers the H2S scrubber filter disks if they are installed. The membrane
retainer is installed to the top of the sensor retainer with a single Phillips
screw.
Combustible Gas Sensor
The combustible gas sensor detects combustible gas and vapors in the
atmosphere with a catalytic element. The reaction of gas with oxygen on
the catalyst cause s a change in the resist ance of the elemen t, which affe cts
the current flowing through it. The current is amplified by the Model GP01’s circuitry, converted to a measurement of combustible gas
concentration, and displayed on the LCD.
CAUTION: Do not expose the combustible gas sensor to high
concentrations of combustible gas, which are found, for
example, in a butane lighter. Exposure to high concentrations
of combustibl e gas may adversely affect the performance and
life of the combustible gas sensor.
Model GP-01 Operator’s Manual Description • 6
LCD
The LCD is visible through the front of the case. When the GP-01 is in
Measuring Mode, the target gas concentration, battery condition, and
alarm indications are displayed on the LCD. Various other items are
displayed when th e LCD is in other modes, such as Calibration Mode.
When either of the two control butt ons are pressed, the LCD backlight
comes on for 20 seconds.
Control Buttons
Below the LCD are two control buttons: POWER/MODE and AIR. The
POWER/MODE button turns the Model GP-01 on and off. The functions
performed by the control buttons are summarized in the followi ng table:
Table 2: Model GP-01 Control Buttons
Button Function
• Turns the unit on and off.
• Turns the LCD back light on.
• Displays peak readings.
POWER/MODE
AIR
• Resets the alarm circuit (gas alarms).
• Enters Calibration Mode with the AIR button.
• Enters Alarm Adjustment Mode with the AIR
button.
• Turns the LCD back light on.
• Adjusts LCD readings when the fresh air
adjustment is performed.
• Enters Calibration Mode with the POWER/MODE
button.
• Enters Alarm Adjustment Mode with the POWER/
MODE button.
• Increases settings when the unit is in Alarm
Adjustment Mode or Calibration Mode.
Printed Circuit Boards
The primary function of the Model GP-01’s printed circuit boards is to
amplify the signal sent to them from the combustible gas sensor, convert
the signal to a meaningful measurement of gas co ncentration, display the
gas concentration on the LCD, store peak gas readings, and activate the
alarm circuit if an alarm point has bee n reached. They monitor battery
level, battery failu re, and sensor fa ilure. They also co ntrol various oper ating
modes of the unit.
7 • Description Model GP-01 Operator’s Manual
NOTE: The printed cir cuit boards contain no us er serviceable parts.
Alarm Lights
The Model GP-01 has two red LED alarm lights. They alert you to
combustible gas, low battery, and sensor failure alarms. The smaller of the
two lights is sq uare , ha s a frosted plastic cover, and is located at the top of
the unit to the left of the membrane retainer. The larger alarm light is
rectangular in shape, has a diamond-grid pattern etched into the plastic
cover, and is located to the left of the LCD on the front of the case.
Buzzer
A solid-state electronic buzzer is mounted inside the Model GP-01. An
opening in the se nsor re tainer on to p of the case allo ws the buzze r’s sound
to emanate from the case. The buzzer sounds for gas alarms, unit
malfunctions, and dead battery alarm. It also serves as an indicator during
normal use of the various LCD display options.
Vibrator
A vibrating motor (vibrator) is mounted inside the Model GP-01. The
vibrator vibrates momentarily during the power-up sequence and for gas
alarms.
Batteries
Two AAA-size alkaline batteries (standard) or an optional rechargeable Nicad battery pack (2.4VDC) run the Model GP-01. Instrument run time is
dependent upon battery type. At 25°C the alkaline batteries last up to 16
hours, and the Ni-cad batte ry p a ck last s up to 8 h ou rs. Th e ba ttery ic on on
the LCD shows remaining battery life.
When the Model GP-01 detects low battery voltage, a low battery warning
is activated. When battery voltage is too low for normal operation, the
Model GP-01 sounds a dead battery alarm.
The alkaline batteries or the Ni-cad battery pack can be replaced by
removing the battery door at the bottom of the case. Turn the captive
battery cover screw counterclockwise to release the door.
The Ni-cad battery pack can be recharged by placing the Model GP-01 in
its optional battery charging station.
WARNING: To prevent ignition of a hazardous atmosphere, batteries
must only be changed or charged in an area known to be
nonhazardous.
Model GP-01 Operator’s Manual Description • 8
Start Up
This section explains how to start up the Model GP-01 and to get it ready
for operation.
CAUTION: Before each day’s usage sensitivity must be tested on a known
concentration of the combustible target gas, typically methane,
equivalent to 25 - 50% of full scale. Accuracy must be within -0 - +
20% of concentration. Accuracy may be corrected by followi ng the
calibration instructions in “Calibration” on page 18.
Start-up Procedure
1. Press and hold the POWER/MODE button for three seconds to turn on
the Model GP-01.
For several seconds, all elements of the LCD display and the LCD
backlight turn on. The vibrator activates briefly, and it then shuts off.
The alarm lights fl ash on and the buzzer sounds, and then they both
turn off.
2. The Model GP-01 then displays “HC” before displaying the battery
voltage. The bu zzer sounds aga in af ter the b attery volt age is displ ayed.
CAUTION: If the unit gives a low battery warning or dead battery alarm,
change the alkaline batter ies or charge the Ni-cad b attery pack
before using the unit.
3. The combustible sensor inside the Model GP-01 begins operating and
the concentration of the target gas is displayed on the LCD. The Model
GP-01 is now in Measuring Mode. The target gas is displayed as a
percentage of LEL (lower explosive limit). The LEL is the lowest
concentration of gas in air that will ignite upon contact with a source of
ignition (e.g., a spark). The backlight turns off after 20 seconds.
Performing a Fresh Air Adjustment
Before using the Model GP-01, set the fresh air reading. Performing this
adjustment ensures accurate gas readings in the monitoring environment.
1. Find a fresh air environment of normal oxygen content (20.9%) that is
free of toxic or combustible gases.
2. With the unit on and in Measuring Mo de, press and ho ld the AIR butto n.
The LCD displays “hold” prompting you to hold the AIR button.
3. Release the A IR button when the LDC displays “AdJ”. The unit will set
the reading to 0% LEL and return to Measuring Mode.
9 • Start Up Model GP-01 Operator’s Manual
Operation
Tu rning Off the Model GP-01
1. Press and hold the POWER/MODE button for about five seconds to
turn off t he un it. Th e buzze r w ill soun d wh ile the P OWER/ MODE button
is being pressed before the unit turns off.
2. Release the bu tton when the LCD is blank. The unit is off.
This section describes the normal operation of the GP-01 in Measuring
Mode and how to display the pe ak readi ng. It also covers al arm indicati ons.
Measuring Mode
To put the Model GP-01 in Measur ing Mode, assuming the unit is of f, pr ess
and hold the POWER/MODE button for three seconds.
Before continuing, it is advisable to perform a fresh-air adjustment in a
fresh-air environment. Making this adjustment ensures accurate gas
readings in the monitoring environment. Refer to “Start Up” for more
information.
In Measuring Mode, the battery level and combustible gas concentration
are displaye d on the LCD. The battery icon has four bars visible when the
batteries have a full charge. As the battery charge decreases, the bars will
gradually disappear, one by one.
The combustible gas conce ntration i s displayed be low the bat tery icon as a
percentage of the LEL (lower explosive limit).
Battery level
% LEL
Gas concentration
0
Figure 3: LCD in Measuring Mode
Displaying the Peak Gas Reading
As the Model GP-01 samples the combust i ble target gas in the monitoring
environment, the unit will re cord the highest com bustible gas concent ration
that occurred since the unit was turned on. This highest level is called the
peak gas reading.
Model GP-01 Operator’s Manual Operation • 1 0
NOTE: The peak gas reading is cleared automatically when the Model
GP-01 is turned off.
1. The unit must be in Measuring Mode. The current gas concentration
should be displayed on the LCD.
2. Press and release the POWER/MODE button to enter Peak Gas
Display Mode. The LCD backlight will activate and the LCD will display
the peak gas reading. A small peak symbol is displayed in the upper left
corner of the LCD.
Peak
Symbol
.
% LEL
Battery level
Gas concentration
0
Figure 4: LCD in Peak Gas Display Mode
3. Press and release the POWER/MODE button once again to return the
unit to Measurin g Mode.
NOTE: If you do not press a button for 20 seconds while displaying the
peak gas reading, the unit will return to Measuring Mode
automatically and the backlight will turn off.
Combustible Gas Detection
There are three issues that must be considered when checking for
combustible gas.
• The combustible gas sensor will respond to any combustible gas. The
standard calibration for the GP-01 is to methane (CH4). If the
instrument is to be used to mo nitor for a dif ferent comb ustible gas, such
as hexane or propane, it should be calibrated to that gas.
The table below lists the conversion factors for several hydrocarbon
gasses if the GP-01 is calibrated to methane. To use this table,
multiply the display reading on the GP-01 by the factor in the
appropriate row to obtain the actual gas concentration. For example, if
you are detecting pentane and the display reads 10% LEL, you actually
have 10% LEL x 1.35 = 13.5% LEL pentane present.
11 • Operat ion Model GP-01 Operator’s Manual
Table 3: LEL Hydrocarbon Conversions
Gas
LEL Conversion
Factor (Methane
Calibration)
Gas
LEL Conversion
Factor (Methane
Calibration)
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 2.00
IPA 2.50
• The GP-01 provides the combustible sensor with some protection
against exposure to high levels of combustible gas. It does this by
turning off the sensor power temporarily when it determines that an
over scale (more than 100% LEL) concentration of combustible gas is
present that may damage the sensor. Nevertheless, concentrations of
combustible gas of more than 100% LEL can still affect the zero level or
calibration o f the combustible sensor if the concentration is high
enough.
CAUTION: Do not expose the combustible sensor to high concentrations
of combustible gas such as that from a butane lighter.
Exposure to high concentrations of combustible gas may
adversely affect the performance of the sensor.
•The H2S scrubber disks are not normally installed in the GP-01 as
shipped from the factory. If H2S is present in the monitoring area, the
H2S scrubber disks should be installed to protect the sensor from H2S
exposure. However, if the H2S scrubber disks are used, then response
to solvent gases such as IPA, toluene, or styrene will be slowed and
decreased. If the GP-01 is to be used for solvent gas applications, do
not install the H
S scrubber disks.
2
Model GP-01 Operator’s Manual Operation • 1 2
Alarms
This section covers alarm indications. It also tells you how to reset the
Model GP-01 after an alarm has occurred and how to respond to an alarm
condition.
Alarm Indications
The Model GP-01 will sound an alarm, flash its alarm lights, and vibrate
when the target gas concentration rises above the low alarm point. The
Model GP-01 also sounds an alarm, flashes i t s al ar m lig hts, and vibrates
when the high alarm point is reached. In addition, the Model GP-01 has a
low battery warning, a dead battery alarm, an over range alarm, a sensor
failure alarm, and a system failure alarm. See Table 4 below for a
description of each alarm indication.
Table 4: Alarm Types and Indications
Alarm T ype LCD Indications Other Indications
Low Alarm
Concentration of gas
rises above the low
alarm point.
High Alarm
Concentration of gas
rises above the high
alarm point.
Over Range
Concentration of gas
rises above the
measuring limit of the
Model GP-01. (Or
there could be a
problem with the unit.)
• Gas reading
flashes.
• Back light turns on.
• Gas reading
flashes.
• Back light turns on.
• Gas reading
replaced by blinking
brackets.
• Back light turns on.
• Pulsing tone occurs
once per second.
• Unit vibrates once
per second.
• Alarm lights flash
once per second.
• Pulsing tone occurs
twice per second.
• Unit vibrates twice
per second.
• A larm light flashes
twice per second.
• Pulsing tone occurs
once per second.
• Unit vibrates once
per second.
• A larm light flashes.
Low Battery Warning • La s t remaining bar
•None
on the right in
battery icon
flashes.
13 • Operat ion Model GP-01 Operator’s Manual
Table 4: Alarm Types and Indications
Alarm T ype LCD Indications Other Indications
Dead Battery Alarm • Gas reading
replaced by FAIL.
• Battery icon
flashes.
Sensor Failure • Gas reading
replaced by FAIL.
• Double pulsing tone
(two pulses in quick
succession) occurs
once a second.
• Double pulsing tone
(two pulses in quick
succession) once a
second.
System Failure • Gas reading
replaced by FAIL.
• SYS displays below
FAIL.
• Double pulsing tone
(two pulses in quick
succession) once a
second.
Resetting Gas Alarms
To reset a gas alarm, press the POWER/MODE button after the gas
reading falls below the low alarm point.
NOTE: If the gas concen tration has returned to normal or has fa llen belo w
the low alarm point, the alarm indications will continue until you
reset the alarm using the POWER/MODE button.
Responding to Alarms
This section describes response to gas, over range, battery, sensor failure,
and system failure alarms.
Responding to Gas Alarms
1. Follow your established procedur e for an increasing combustible gas
condition.
2. Reset the alarm by pressing and rel easing the POWER/MODE button
after the alarm condition has been cleared.
Responding to an Over Range Alarm
WARNING: An over range condition may indicate an extreme
combustible gas concentration. Confirm the gas
concentration with a different Model GP-01 or with
another gas detecting device.
1. Follow your established procedur e for an increasing combustible gas
condition.
2. Reset the alarm by pressing and rel easing the POWER/MODE button
Model GP-01 Operator’s Manual Operation • 1 4
after the alarm condition has cleared.
3. Calibrate the Model GP-01 as described in the calibration section of this
manual.
4. If the over range condition continues, you may need to replace the
sensor.
5. 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 Model GP-01 is not operational as a gas monitoring
device during a dead battery alarm. Take the Model GP-01
to a non-hazardous area and change the alkaline
batteries or charge the Ni-cad battery pack as described
in “Replacing or Charging the Batteries”.
The Model GP-01 is fully functional in a low battery warning condition.
However, only a limited amount of time remains for operation,
approximately 30 minutes when using the Ni-cad battery pack or 2 hours
when using alkaline batteries. The amount of time depends on how often
the LCD backlight is used and how often the unit is responding to alarm
conditions.
NOTE: Alarms and the back light feature consume battery power and
reduce the amount of operating time remaining.
When a low battery warning occurs, change or charge the batteries as
soon as possible. Refer to the instructions in “Replacing or Charging the
Batteries” for more information .
Responding to a Sensor Failure Alarm
1. Try calibrating the Model GP-01 first, as described in “Calibration”,
before replacing the sensor.
2. If the sensor failure continues, replace the sensor as described in
“Replacing the Combustible Sensor”.
3. If the gas sensor failure conditio n contin ues af ter you have replaced the
gas sensor, contact RKI Instruments, Inc. for further instructions.
Responding to a System Failure Alarm
1. If a system failure occurs, try turning the unit off then on again.
2. If the unit remains in system failure, contact RKI Instruments, Inc. for
further instructions.
15 • Operat ion Model GP-01 Operator’s Manual
Alarm Points
.
The Model GP-01 allo ws you to displa y and set the alarm po ints. There is a
low alarm point and a high alarm point. Both are rising alarms, meaning
that the alarm condition is tri ggered when the gas concentra tion rises to the
alarm point. The alarm point factory set tings are summarized b elow:
The low alarm p oi nt can be a dj ust ed between a range of 0% LEL a nd 50%
LEL. The high alarm point can be adjusted between a range of 10% LEL
and 100% LEL.
Displaying and Adjusting the Alarm Points
1. Make sure the Model GP-01 is turned off. The LCD should be bl an k.
Table 5: Alarm Points of the Model GP-01
Low Alarm High Alarm
10% LEL Increasing 50% LEL Increasing
2. Press and hold the AIR button, then press and hold the POWER/MODE
button.
3. As soon as segments appear on the d isplay (approximately one
second), release the AIR button. When the unit “beeps”, release the
POWER/MODE button to put the Model GP-01 into Alarm Point
Adjustment Mode. The LCD should display the low alarm setti ng for the
target gas and the battery level.
Rising
Alarm
% LEL
Battery
level
Alarm point
10
Alarm
Name
Figure 5: LCD in Low Alarm Point Adjustment Mode
NOTE: If the LCD should show “CAL” in the lower left corner, the Model
GP-01 is in Calibration Mode. You will need to press and hold the
POWER/MODE butto n to tur n of f th e uni t. Beg in agai n with step 2
above.
LO
4. While the Model GP-01 is displaying the low alarm point, use the AIR
button to change the setting. Pressing and releasing the AIR button in
quick succession increases the low alarm point one number at a time.
Model GP-01 Operator’s Manual Alarm Points • 16
Pressing and holding the AIR button increases the low alarm point by
.
ten percentage points at a time.
NOTE: If you pass the desire d alarm point settin g, continue increasi ng the
alarm point until it reaches the maximum setting, at which point
the alarm point number will “wrap around” to its minimum setting.
5. Press and release the POWER/MODE button to display the high alarm
point in the LCD. If you h ave ch an ged the low alarm point setting, it will
be saved automatically after you press the POWER/MODE button.
Rising
Alarm
% LEL
Battery
level
Alarm point
50
Alarm
Name
Figure 6: LCD in High Alarm Point Adjustment Mode
NOTE: If you press and hold the POWER/MODE button for too long
(about five seconds), you will turn off the unit.
6. Use the AIR button to change the hi gh alarm point setting. Pr essing and
releasing the AIR button in quick succession increases the high alarm
point one number at a time. Pressing and holding the AIR button
increases the high alarm point by ten percentage points at a time.
HI
NOTE: You can only cycle through the alarm points once before the
Model GP-01 goes into its start-up sequence, which then places
the unit in Measuring Mode. I f you want to cycle through t he alarm
points agai n, pr ess and hold the POW ER/ MODE button to tur n off
the Model GP-01. Then begin with step 2 above to put the unit
back into Alarm Point Adjustment Mode.
17 • Alarm Points Model GP-01 Operator’s Manual
7. When you are finished viewing o r adjusting the alarm point settings,
press and release the POWER/MODE button until the ROM number of
the unit appears on the LCD. Th e RO M is the component that contai ns
the software that runs the Model GP-01. The Model GP-01 will then go
into its start-up sequence followed by Measuring Mode.
Calibration
This section covers the calibration of the Model GP-01. Setting the fresh air
reading is described first f ollowed by setting t he sp an read ing. You are also
told what is needed to complete the task and how to assemble the
calibration ki t.
WARNING: Use a 0.5 LPM (liters per minute) fixed flow regulator
Calibration Frequency
If the GP-01 passes the response test described in “Start Up” on page 9
and does not require calibration after startup, the unit should still be
calibrated periodically. The optimum frequency of calibration depends
heavily on how the GP-01 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 develop a calibration sched ule tailored to your application th at t a kes the
response test and required calibration resulting from this test into account.
when calibrating. Using a different flow rate may
adversely affect the accuracy of the calibration.
Setting the Fresh Air Reading
You will need to set the fresh air reading first before setting the span
reading.
1. Find a fresh air environment of normal oxygen content (20.9%) that is
free of toxic or combustible gases.
2. With the unit on and in Measuring Mo de, press and ho ld the AIR butto n.
The LCD displays “hold” prompting you to hold the AIR button.
3. Release the A IR button when the LCD displays “AdJ”. The unit will set
the reading to 0% LEL and return to Measuring Mode.
Setting the Span Reading
This section tells you how to set the span re ad in g usi ng Cali bration Mode.
Preparation
Set the fresh air reading as described in “Setting the Fresh Air Reading”.
You will also need the supplies listed below. A calibration kit is available
from RKI Instruments, Inc. for the Model GP -01 for this purpose (see “Par ts
List”).
Model GP-01 Operator’s Manual Calibration • 18
• You will need a gas cylinder with an appropriate concentration of the
target gas. The Model GP-01’s calibratio n val ue mu st mat ch the gas
concentration in the calibration cylinder, otherwise the calibration will
not be accurat e.
CAUTION: Do not use a gas mix that includes H2S to calibrate the GP-01.
• To carry out the calib ration, you will need a fixed-flow regulator with a
flow rate of 0.5 LPM (liters per minute), non-absorbent tubing, and the
calibration adapter that will fit over the Model GP-01’s sensor.
Assembling the Calibration Kit
WARNING: Calibrate the Model GP-01 in a non-hazardous
environment.
1. Attach the calibration adapt er to the top of the Model GP-01. The
calibration adapter opens up like a clothes pin. It fits over the Model
GP-01’s gas sensor port on top of the sensor ret ainer and secures it self
there by clamping to the front and back of the Model GP-01.
2. Attach the calibration tubi ng to the calibrati on adapter, and then attach
the opposite end of the tubing to the regulator.
NOTE: Do not attach the regulator to the gas cylinder at this time.
Setting the Span Readings for the Target Gas
1. Make sure you have set the fresh air reading and have set up the
calibration kit as described in the procedures above.
2. Make sure the Model GP-01 is off.
3. Press and hold the AIR button, and then press and hold the POWER/
MODE button. Release both buttons when you hear a “beep”. The unit
is in Calibration Mode and the LCD displays “CAL” in the lower left and
the battery level in the up per right. It also displays the gas concentration
that the unit expects you to use, the calibration value, when setting the
span.
4. If necessary, use the AIR button to adjust the calibration value to the
desired setting. The calibration value must match the gas concentration
in the calibration cylinder.
5. Press the POWER/MODE button to accept the calibration value. The
current gas reading is displayed , and “CAL” will blink in the lower left
corner of the LCD. The unit is now in Span Adjustment Mode.
19 • Calibration Model GP-01 Operator’s Manual
If you want to cancel the calibration while in Span Adjustment Mode,
press and hold th e AIR ke y for 3 seconds an d the un it will not make any
span adjustments and begin its startup sequence.
NOTE: If one of the control buttons is not pressed within 10 minutes, the
unit will return to Measuring Mode automatically.
6. Attach the regulator to the gas cylinder. The fixed-flow regulator
automatically begins introducing the calibration sample to the sensor.
7. Let the gas flow for two minutes. After two minutes, press the POWER/
MODE button. The unit will adjust the span based on the calibration
value that was saved in step 5 above. As soon as the unit makes the
calibration adjustment, it will begin its start-up sequence, and then it will
enter Measuring Mode.
NOTE: If the GP-01 displays “FAIL” on the LCD after you press the
Power/MODE button, the sensor output may be too low or too
high or there may be a problem with the calibration gas or
calibration kit setup. Refer to the Troubleshooting section in
Maintenance t o solve the problem.
8. Remove the regulator from the gas cylinder and the calibration adapter
from the unit.
NOTE: If the gas reading is high enough when the unit enters Measuring
Mode, an alarm condition will occur. If this occurs, reset the alarm
using the POW ER/MODE button whe n the gas re ading f alls below
the alarm point.
Model GP-01 Operator’s Manual Calibration • 20
Maintenance
This section describes troubleshooting procedures for the Model GP-01. It
also describes how to change or charge the Model GP-01’s batteries as
well as how to replace the unit’s gas sensor and filter disks.
WARNING: RKI Instruments, Inc. recommends that service,
Troubleshooting
The troubleshooting table describes error messages, symptoms, probable
causes, and recommended actions for problems you may encounter with
the Model GP-01.
calibration, and repair of RKI instruments be performed
by personnel properly trained for this work. Replacing
sensors and other parts with original equipment does not
affect the intrinsic safety of the instrument.
Table 6: Troubleshooting the Model GP-01
Symptoms
• The LCD is
blank.
• The LCD shows
abnormally high
readings but
other gas
detection
instruments do
not.
Probable
Causes
• The unit may
have been
turned off.
• The alkaline
batteries may
need to be
replaced or the
Ni-cad
batteries
recharged.
• The unit may
need to be
recalibrated.
• The sensor
may need
replacement.
Recommended Action
1. To turn on the unit, press
and hold the POWER/
MODE button.
2. If the unit does not turn on,
replace the alkaline
batteries or recharge the
Ni-cad batteries.
3. If the difficulties continue,
contact RKI Instruments,
Inc. for further instruction.
1. Recalibrate the unit.
2. Replace the sensor and
calibrate the unit.
3. If the difficulties continue,
contact RKI Instrument s for
further instruction.
21 • M aintenance Model GP-01 Operator’s Manual
Table 6: Troubleshooting the Model GP-01
Symptoms
• “FAIL” displays
during span
adjustment.
Probable
Causes
• The calibration
value may not
match the
cylinder gas
concentration.
• The sample
gas is not
reaching the
sensor
because of a
bad
connection.
• The calibration
cylinder may
be out of gas
or is outdated.
• The sensor
may need
replacement.
Recommended Action
1. Check all calibration tubing
for leaks or for any bad
connections.
2. Make sure the Model GP01 has been pr operly set
up for calibration.
3. Verify that the calibration
cylinder contains an
adequate supply of fresh
test sample.
4. If the fail condition
continues, replace the
sensor.
5. If the difficulties continue,
contact RKI Instruments,
Inc. for further instruction.
• “FAIL SYS” is
displays on the
LCD
• A microprocessor failure has
occurred.
1. Turn off the unit and turn it
on again.
2. If d i fficulties continue,
contact RKI Instruments,
Inc.
Replacing or Charging the Batteries
WARNING: To prevent ignition of a hazardous atmosphere, batteries
must only be changed or charged in an area known to be
nonhazardous.
Replace or charge the batteries when th e battery icon
indicates that the unit is in low battery warning. When in low
battery warning, only one battery level indication bar is
displayed in the battery icon on the LCD, and this icon will
be flashing.
Model GP-01 Operator’s Manual Maintenance • 22
To Replace the Alkaline Batteries or Ni-Cad Battery Pack
NOTE: The Ni-Cad battery pack will have a typical serv ice life of 500
charging cycles minimum before it needs replacement.
1. Verify that the Model GP-01 is off.
2. Remove the battery end protective rubber boot.
3. Rotate the captive battery cover screw counterclockwise to remove
battery compartment door.
AIR
GP-01
MODE
POWER
%LEL
Figure 7: Removing the Battery Compartment Door
4. Carefully remove the old alkaline batteries or Ni-cad battery pack.
5. Carefully install the new AAA alkaline batteries or Ni-cad battery pack.
For alkaline batteries, follow the battery diagram inside the battery
compartment.
For a battery pa ck, r ea d th e o r ie ntation label on th e pack and insert the
end that says “To Ga s Monitor” first.
6. Reinstall the battery cover.
To Recharge the Ni-cad Battery Pack in the GP-01
CAUTION: To be used with RKI Ni-cad battery pack p/n 49-1603RK.
Charge only with RKI charger model BC-01, p/n 49-2159RK.
1. Plug the power cord of the optional Ni-cad battery charging station into
an AC outlet.
2. Make sure the Model GP-01 is off.
3. Remove the battery end protective rubber boot.
4. Place the Model GP-01 into the battery charging station as shown in
Figure 8 below so that the metal contacts on the back of the unit come
into contact with the metal contacts in the back part of the holder in the
charging stati on . W hen pr op er con t act has been made, the red LED on
the charging station will turn on.
23 • M aintenance Model GP-01 Operator’s Manual
Red Charging LED
POWER
MODE
%LEL
AIR
GP-01
Figure 8: Putting GP-01 Into Charging Station
5. When a full charge has been reached, approximately 40 minutes, the
red LED on the charging station will turn off. Remove the Model GP-01
from the char ging station and unplug the charging station’s po wer cord
from the AC outlet.
To Recharge the Ni-cad Battery Pack Out of the GP-01
The GP-01 battery pack may be recharged directly in the charger without
being in a GP-01. This capability is useful if you have spare battery packs.
The following instructions assume the battery pack is not in a GP-01.
1. Plug the power cord of the optional Ni-cad battery charging station into
an AC outlet.
2. Place the battery pack into the front part of the bat tery charging station
as shown in Figure 9 below so that the metal contacts on the battery
pack come into contact with the metal contacts in the front part of the
holder in the charging station. A label on the pack which reads “To
Charger” indicates which end to insert into the charger. When proper
contact has been made, the red LED on the charging station will turn
on.
Model GP-01 Operator’s Manual Maintenance • 24
Battery Pack
Red Charging
LED
Figure 9: Putting Battery Pack Into Charging Station
3. When a full charge has been reached, approximately 40 minutes, the
red LED on the charging station will turn off. Remove the battery pack
from the char ging station and unplug the charging station’s po wer cord
from the AC outlet.
Replacing the Combustible Sensor
WARNING: Replace the sensor in a non-hazardous environment.
1. Verify that the Model GP-01 is off.
2. Remove the sensor end protective rubber boot.
3. With a small Phillips screwdriver, carefully unscrew the two screws that
hold the sensor retainer in place.
Sensor Retainer
LEL Sensor
AIR
GP-01
MODE
POWER
%LEL
Figure 10: Removing the Sensor Retainer
25 • M aintenance Model GP-01 Operator’s Manual
4. Carefully remove the old sen sor from the sensor socket.
th
S
NOTE: Note the orientat io n of the ol d senso r befor e you remove it.
5. Carefully insert the replacement sensor in the socket. Make sure the
sensor face with the yellow colored ring is facing up and that the sensor
contacts line up with the contacts in the sensor socket.
Line Up Sensor Contacts Wi
Contacts In Sensor Socket
hown Without Sensor Retainer
Figure 11: Replacing the Sensor
CAUTION: When replacing the sensor, verify that the sensor is properly
aligned with its socket before inserting it. Forcing the sensor
into its socket may damage the sensor or the socket.
6. Reinstall the sensor retainer.
7. Calibrate the new sensor as described in the calibration section of this
manual.
Replacing the Sensor Filters
WARNING: Replace the sensor filters in a non-hazardous
environment.
When replacing the sensor filters, it is recommended that you replace all
three filters at the same time.
1. Verify that the Model GP-01 is off.
2. With a small Phillips screwdriver, carefully unscrew the single screw
that holds the membrane retainer in place.
Model GP-01 Operator’s Manual Maintenance • 26
POWER
%LEL
GP-01
MODE
AIR
H2S Scrubber Disks
Sensor Cover
Figure 12: Replacing the Sensor Filters
3. Rotate the me mbrane reta iner abo ut one-qu arter tu rn counter clockwise
to remove it from the sensor retainer (the top of the unit).
4. Carefully remo ve the old filter or filters from the recess in the senor
retainer.
NOTE: Install the new sensor filter or filters into the recess. If H2S
scrubber filters are used, put them in first. Make sure they are
properly seated in the recess. Then insert one sensor cover in the
recess over the two H2S scrubber disks.The H2S scrubber filters
are shown for reference in case they are installed. They are not
installed as shipped from the factory. See “Combustible Gas
Detection” on page 11 for a discussion of when they should be
installed.
CAUTION: If the H2S scrubber disks are installed, be very careful not to
push them too far into the recess in the sensor retainer. Lay
the disks carefully in the opening on top of the small tabs in the
recess.
5. Reinstall the membrane retainer.
27 • M aintenance Model GP-01 Operator’s Manual
Parts List
Table 7 lists replacement parts and accessories for the Model GP-01.
Table 7: Parts List
Part Number Description
06-1248RK Calibration kit tubing (specify length in feet)
07-6009RK Gasket for battery cover
10-1099RK Screw, M2X 4mm pan head Phillips, stainless
steel, for membrane retainer
10-1105RK Screw, M2X 8mm pan head Phillips, stainless
steel, for sensor retainer
10-1141RK Screw,M2.5 x 3mm pan head Phillips, stainless
steel, for alligator and belt clip installation.
13-0112RK Wrist strap
13-0114RK Alligator clip
13-0213RK Belt Clip
13-1115RK Captive battery cover screw
20-0316RK Rubber boot, sensor end
20-0317RK Rubber bo ot, battery end
21-1848RK Membrane retainer
21-1849RK Sensor retainer
33-0166RK Sensor cover disk membrane, 10 pack
33-7113RK Filter disk, H
S scrubber, 10 pack
2
49-1110RK AAA size alkaline battery
49-1603RK Ni-cad battery pack for GP-01
49-2159RK BC-01 Battery charging station
81-0012RK-01 Calibration cylin der, 50% LEL methane in air, 34
liter
81-0012RK-03 Calibration cyl inder, 50% LEL metha ne in air,
103 liter
81-1003RK Regulator, fixed flow, 0.5 LPM, for 17/34 liter
steel cylinder
Model GP-01 Operator’s Manual Parts List • 2 8
Table 7: Parts List
Part Number Description
81-1004RK Regulator, fixed flow, 0.5 LPM, fo r 103 lite r steel
cylinder
81-1104RK Calibration adapter for GP-01 & GasWatch 2
81-GP01-LV Calibration kit, methane LEL, 34 liter
NC-6264AT Combustible LEL sensor
29 • Parts List Model GP-01 Operator’s Manual
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