KWJ Pocket CO 300 User manual

Rev. 2.0
Read all of the information in this booklet before using
Pocket CO.
Many factors can affect air quality. This instrument will give a
dependable indication of CO levels but should not be considered
an all-inclusive monitor for overall air quality. Pocket CO is only
one tool for CO measurement or CO dosimetry for personal use.
Pocket CO’s Self-Test checks most of its functionality but does
not test the CO sensor which can only be tested with actual
exposure to carbon monoxide. Monthly "bump" testing of the
Pocket CO with a source of carbon monoxide is recommended.
KWJ sells a CO bump test kit for this purpose.
Pocket CO is small and light enough to be transported in your
pocket. However Pocket CO should not be operated while in your
pocket. To detect CO Pocket CO must be well exposed to your
surrounding environment (e.g. on your key chain attached to
your dashboard or uniform or worn around your neck).
In the beginning of 2007, the manufacturer of Pocket CO, Transducer
Technology, Inc., was merged into WJ Engineering Inc. The two
companies had been cooperating for two years, and now are combined as
one corporate entity, under the name of WJ Engineering Inc., a company
that has been engaged in the manufacture of gas detection instruments
since 1993. Production, sales and financial matters are handled primarily
by the parent company, while research and new product development are
the focus of the former Transducer Technology, Inc., now known as
Transducer Technology Division.
WARNING
!
NOTIC

Rev. 2.0
1
IND X
1. Introduction 2
2. Specifications 3
3. Using Your Pocket CO 5
3.1 Normal Operation 5
3.2 Turning Pocket CO Off 5
3.3 Using the Backlight 6
3.4 Viewing Dosimetry Information 6
3.5 Understanding Alarms 6
3.6 Understanding Dosimetry/TWA Warnings 9
3.7 Replacing the Battery 11
3.8 Using the Menu 13
3.9 Calibration
14
3.10 Additional Usage Information 15
4. Glossary of Terms 16
5. Care and Maintenance 17
6. Contact Us 18
7. Warranty 19
8. CO Health ffects Inside back cover

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1. Introduction
Pocket CO Model 300 has been designed as a simple and
effective tool to determine, measure, or record Carbon Monoxide
(CO) levels in any environment. The instrument has been
programmed based on guidelines for indoor and outdoor CO
exposure from several organizations, including OSHA and
ACGIH. Alarms are factory set at 50PPM, the ACGIH maximum
recommended short-term exposure of 125PPM, and a death
hazard of 400 PPM CO.
Low levels of CO, typically less than 10 PPM, are not considered
especially hazardous, but they do indicate a source of CO.
Sustained levels above 25 PPM for 8 hours, and short-term
exposure to more than 125 PPM CO, should be avoided. Seek
clean air, ventilation, or any other means to eliminate exposure.
Get more information online at http://www.kwjengineering.com
and at http://www.detectcarbonmonoxide.com.
Pocket CO Model 300 is a stand-alone unit, and because of its
small size can be carried on a key ring, clipped to a worker’s shirt
pocket, or attached to the dashboard of a vehicle or piece of
equipment. Pocket CO is designed specifically to be affordable
and easy to use by health professionals and concerned
homeowners. The device can be used in CO detection
applications such as OSHA enforcement, fire service exposure,
parking garages, warehouses, municipal buildings, hotel rooms,
home furnace inspection and barbecue areas; and for mobile
measurements on boats, cars, trucks, trains, airplanes, and
anywhere else Carbon Monoxide exposure is possible.

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2. Specifications
Size: 2.66 x.1.40 x 0.61 inches (67.6 x 35.6mm x15.5 mm)
Weight: < 1 ounce (28 grams)
Range: 5-500 PPM CO
Response time: < 90 seconds to 90%
Operating
temperature:
32-105 F 0-40 C displayed; readings automatically
compensated.
Pressure effects: Reading decreases with decreasing pressure down to 70%
at 10 000 ft
Humidity limits: 15-85% RH non-condensing
Alarms:
(82 dB buzzer @ 24
in LED Backlight
Vibrator)
Optional first alarm at or above 50 PPM.
Second alarm at or above 125 PPM.
Third alarm at or above 400 PPM.
Hourly warning when CO above the 8-Hour 25 PPM ACGIH
TWA.
Temperature above 50
o
C / 122
o
F: “HOT” displayed
Temperature below 0
o
C / 32
o
F: “COLD” displayed
Low battery warning: “BATT” displayed
Sampling method: Gaseous diffusion.
Interferences: None significant except hydrogen.
Periods of Operation: “12-Hour” and “Always On”
Display: Digital LCD with backlight in increments of 1 ppm.
User interface: Single button operation.
Dosimetry
(12-Hour Detection
period only):
Calculates and records: “MAX” maximum exposure (ppm)
“TIME” time of max. exposure (minutes since turned on)
“TE” total exposure in ppm-hours
8-hour “TWA” time weighted average.
Tests: Self-Test on startup checks circuitry alarms battery and
operating temperature. Does not check sensor.
Calibration: Recommended at least 1x per year or whenever accuracy
of reading is critical.
Sensor: Transducer Technology T-Series electrochemical.
Battery information: Battery check on startup and during operation. User
replaceable CR2450 coin battery.
Warranty: Instrument including sensor: Two years.

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Display with backlight
Buzzer
Button
Red LED Alarm
Rear entry holes for gas
(Do not block)
Screw for battery
compartment cover
Side entry
holes for gas
(Do not
block)

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3. Using Your Pocket CO
3.1 Normal Operation:
The information below describes how to turn Pocket CO on for
normal operation with one of two possible detection periods:
12-Hour Detection: With Pocket CO off quickly push and release
the button. The display will show “12HR”. The instrument will
perform a brief self-test and then show the current CO reading
(PPM). The display will update with a new reading of CO every 5
seconds for a 12-Hour period before turning off automatically.
Using this detection period will help to prolong battery life.
Continuous Detection: With Pocket CO off quickly push and
release the button twice . The display will show “ON”. The
instrument will perform a brief self-test and then show the
current CO reading (PPM). The display will update with a new
reading of CO every 5 seconds and will continue to do so until
turned off by the user. This mode is useful if protection from CO
is required over a prolonged period of time such as on a trip or
long drive. Note that dosimetry information is not recorded or
reported when running in Continuous Detection.
3.2 Turning Pocket CO Off:
To turn Pocket CO off during normal operation quickly push and
release the button once (the backlight will turn on) followed by
pushing and holding the button down. After 2 seconds the red
light will flash and Pocket CO will turn off. Note that this
procedure should be followed even if the backlight is already on
because Pocket CO is alarming.

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3.3 Using the Backlight:
During normal operation, quickly push and release the button
once. The backlight will turn on for a short period of time. Please
note that excessive use of the backlight will reduce Pocket CO’s
battery life.
3.4 Viewing Dosimetry Information:
When running in the 12-Hour Detection period Pocket CO
maintains CO dosimetry information. Dosimetry information
allows you to track your total-exposure to carbon monoxide (TE)
and your 8-hour time-averaged exposure (TWA). It also keeps
track of the maximum concentration of CO measured (MAX) and
when this maximum occurred (TIME) in minutes since being
turned on. Also reported is the total running time (RUN) in
minutes. Pocket CO will save this information until Detection
Mode is entered again. For a more detailed discussion of TE and
TWA see Section 3.6.
To view the dosimetry information during normal operation
quickly push and release the button two times (the backlight will
turn on after the first push). The dosimetry information will be
displayed after a moment starting with the word “DOSM”. After
all of the dosimetry information has been displayed Pocket CO
will resume normal operation.
The dosimetry information from the last use of the 12-Hour
Detection period may also be recalled after Pocket CO has turned
off. With Pocket CO off, quick-push the button three times. The
display will show “DOSM”, and then display the dosimetry
information from the last use of the 12-Hour Detection period.
After displaying this information, Pocket CO will turn back off.

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3.5 Understanding Alarms:
Pocket CO is equipped with the following alarm mechanisms:
• A loud 82 dB beeper (at 24 inches).
• A display backlight.
• A bright red LED on the top of the instrument.
• A vibrator.
Pocket CO is programmed to repeatedly pulse all of these alarms
when the CO exposure reaches or exceeds certain limits. These
limits are pre-programmed at the following levels:
• CO level between 50 PPM and 124 PPM:
Alarm beeper/LED/Vibrator pulse once every 20 seconds.
• CO level between 125 PPM and 399 PPM:
Alarm beeper/LED/Vibrator pulse once every 10 seconds.
• CO level exposure at or above 400 PPM:
Alarm beeper/LED/Vibrator pulse once every 5 seconds.

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These are known as “instantaneous” alarms, since Pocket CO will
alarm as soon as the level of CO reaches or exceeds these
levels. The alarms at these levels are designed to protect you
from the immediate health effects of carbon monoxide. Pay
attention to your Pocket CO when it alarms and vacate the area
until the source of the CO can be found and addressed.
The 50ppm is an optional, low-concentration alarm, which can be
disabled using the Menu (see Section 3.8).
The Pocket CO will also pulse its alarms during the following non-
CO related situations:
• Self Test: One alarm pulse is normal and expected during
the Self Test.
• Temperature above 50oC (122oF) or below 0oC (32oF):
Alarm pulses, plus “HOT” or “COLD” on the display.
• Sensor Malfunction: One alarm pulse, plus “SNSR” on the
display. Note that absence of this alarm does not necessarily
guarantee that the sensor is working normally.

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3.6 Understanding Dosimetry and TWA Warnings:
When run in the 12-Hour Detection period, Pocket CO keeps
track of dosimetry information, which includes your total-exposure
and time-weighted average exposure.
Total-Exposure (TE) is a measure of the amount of CO you’ve
been exposed to over a length of time, and is measured in ppm-
hours.
Example: If from the time you turned on Pocket CO, you were
exposed to 25ppm for 5 hours, and then 10 ppm for 1 hour, your
Total Exposure would be:
Total Exposure = [ (25ppm x 5 hours) + (10ppm x 1 hour) ]
= 135 ppm-hours
Time-Weighted Average exposure (TWA) gives you an idea of
how much CO, on average, you’ve been exposed to, and is
calculated as follows:
TWA = Total Exposure to CO (in ppm-hrs) / 8 hours
Example: If your total exposure was 135 ppm-hours (as in the first
example), your 8-Hour TWA at that point would be:
TWA = 135ppm-hours / 8 hours
= 16.9 ppm
The TWA is called “time-weighted” because its calculation weighs
more heavily exposure that took place over a longer period of