OWNER’S MANUAL
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Table of Contents
LIMITATION OF WARRANTY AND LIABILITY ...... ii
SECTION 1 General Description .....................................2
SECTION 2 Theory of Operation: NDIR Sensor ...........2
SECTION 3 Safety ..............................................................3
SECTION 4 Setting-Up the Model IAQ10......................4
Supplying Power ...........................................................4
Installing the Batteries...................................................4
Using the Optional AC Adapter..................................4
SECTION 5 Operation of the Model IAQ10...................5
ON/OFF Key..................................................................5
READ Key.......................................................................6
(5) Key............................................................................7
RECALL (6) Key...........................................................7
SECTION 6 Maintenance of the Model IAQ10..............8
Case..................................................................................8
Storage .............................................................................8
SECTION 7 Service Information......................................8
Factory Calibration........................................................9
Field Verification..........................................................10
SECTION 8 Troubleshooting of the
Model IAQ10................................................................13
SECTION 9 Internal DIP Switch Settings.....................14
Specifications.....................................................................17
1
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SECTION 1
General Description
The Model IAQ10 is a hand-held meter to
measure Carbon Dioxide (CO2), displayed
in units of parts per million (ppm). An
NDIR sensor in the top end of the meter
measures gas content by diffusion through
sensing holes.
The IAQ10 ships in a pouch that provides a
small amount of protection to the display
and the sensing holes in the top of the
instrument case. The instrument ships with
batteries (which are not installed), a
calibration sheet, and this Owner’s Manual.
SECTION 2
Theory of Operation: NDIR Sensor
The IAQ10 measures carbon dioxide
concentration by relying on one of the
natural properties of CO2 molecules: CO2
molecules absorb light at a specific wave-
length of 4.26 µm. This wavelength is in the
infrared (IR) range. High concentrations of
CO2 molecules absorb more light than low
2
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concentrations. This technique is called
non-dispersive infrared (NDIR) detection.
SECTION 3
Safety
When using the IAQ10 to check for CO2
values, make certain that you can safely
raise and hold the instrument while
making measurements. Be especially
careful when working on a ladder.
Observe all necessary precautions so that
the unit does not become caught in moving
machinery or touch any exposed electrical
wiring.
DANGER!
Use with corrosive or other dangerous or
explosive gas mixtures is not recom-
mended.
3
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SECTION 4
Setting-Up the Model IAQ10
Supplying Power
The IAQ10 can be powered in one of two
ways: four AA-size batteries or the optional
AC adapter.
Installing the Batteries
Insert four AA batteries as indicated by the
diagram located on the inside of the battery
compartment. The Model IAQ10 is de-
signed to operate only with alkaline
batteries. When 15% battery life is remain-
ing, the battery indicator will blink,
indicating the batteries need to be changed.
At 0%, “LO” will display and the meter will
shut off within 10 seconds.
Using the Optional AC Adapter
The optional AC adapter allows you to
power the Model IAQ10 from a wall outlet.
When using the AC adapter, the batteries
(if installed) will be bypassed. The AC
adapter is NOT a battery charger.
4
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SECTION 5
Operation of the Model IAQ10
Note: Do not hold the instrument close to your
face. Humans exhale CO2 and this will affect
the accuracy of the readings.
When pressing the keys on the keypad, the
Model IAQ10 will beep to confirm the
function. If you press a key and the Model
IAQ10 does not beep, the Model IAQ10
does not allow that function during the
selected mode. (See Section 9 for informa-
tion on disabling this feature through an
internal DIP switch.)
ON/OFF Key
Press the ON/OFF key to turn the Model
IAQ10 on and off. When the instrument is
first turned on, it goes through a prepro-
grammed power-up sequence that includes
an internal self-check.
First, all displayable LCD segments will
appear. If a problem is detected, the display
will show “CAL” to indicate that it should
be returned for servicing and/or
5
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calibration. When the Model IAQ10
completes the internal self-check, it will
display the approximate percentage of
battery life remaining.
Note: The sensor needs up to 10 minutes to
stabilize in still air before displayed readings
can be considered accurate. Moving the
instrument may decrease this stabilization time.
READ Key
Carbon dioxide concentrations will be
displayed in parts per million (ppm). The
IAQ10 can be left in a room to monitor
general conditions, but it is important to
ensure that the sensing holes at the top of
the meter are not covered or in a
downward position.
Press the READ key once to start taking a
CO2 sample; press it again to end the
sample. The minimum sample time is five
seconds, even if the second press occurs
after two, three, or four seconds. SAMPLE
will flash on the display while the instru-
ment takes a measurement.
6
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The display updates every second and each
reading is the average of five samples.
(5) Key
The instrument only displays CO2.
RECALL (6) Key
Press the RECALL key repeatedly to
display: minimum value (MIN), maximum
value (MAX), average value (AVG), and
number of seconds sampled (COUNT).
Press the READ key to return to normal
measuring mode.
The instrument does not store readings.
The information viewed in the recall mode
is for the sample reading just taken. Once a
new sample starts or the instrument is
turned off, all previous data is lost.
The (5) and (6) references on keys are
used during the field calibration process.
7
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SECTION 6
Maintenance of the Model IAQ10
The Model IAQ10 requires very little
maintenance to keep it performing well.
Case
If the instrument case or storage case needs
cleaning, wipe it off with a soft, damp
cloth. Never submerge the IAQ10 in any
liquid or allow any liquid to enter the
sensing holes.
Storage
When storing the Model IAQ10 for more
than a month, TSI recommends removing
the batteries. This prevents possible
damage due to battery leakage.
SECTION 7
Service Information
Please return your Product Registration
Card immediately. This allows us to send
service reminders, special offers, and
important information about your product.
8
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Before sending your instrument for
calibration or repair, you should call
Customer Service. The service department
will provide you with the cost of service or
calibration, Return Material Authorization
(RMA) number, and shipping instructions.
Please have the following information
available when you call:
•
Owner’s name, address, and phone
number
•
Billing address, if different and
applicable
•
•
•
•
Instrument name and model
Serial number
Date of purchase
Where purchased
TSI recommends that you keep a “calibra-
tion log” and keep all records of service on
your instrument.
Factory Calibration
To maintain a high degree of accuracy in
your measurements, TSI recommends that
you return your instrument to the factory
for annual calibration. For a nominal fee,
we will calibrate the unit and return it to
9
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you with a NIST (US National Institute of
Standards and Technology) traceable
certificate. This “annual checkup” assures
you of consistently accurate readings; it is
especially important in applications where
strict calibration records must be main-
tained.
Send the instrument to TSI Instruments
Ltd. prepaid. Securely package your
instrument in a strong container sur-
rounded by at least 5 cm of suitable shock-
absorbing material. Include a purchase
order that clearly shows the instrument
model number and serial number, a contact
name, phone, fax number, and RMA
number. Mark the outside of your shipping
container with the RMA number. This will
expedite processing of your instrument
when we receive it.
Field Verification
Field verification of your CO2 instrument is
recommended monthly. You need a gas
tank and regulator. Calibration grade gases
are available through local industrial gas
supply.
10
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1. Turn the instrument off. Under the
batteries, move DIP switch # 7 to ON.
Turn the instrument back on.
2. Press and hold the READ key to begin
the calibration procedure. The display
will begin a countdown from 5 to 0.
Release the key when the display reads
0. If the key is released too soon or too
late, the instrument will go back to sam-
pling in real-time. “ZerO” will appear
on the display if the instrument is in
calibration mode.
3. Install the regulator on the zero calibra-
tion gas tank and connect tubing from
the regulator to the inlet fitting on the
top of the Model IAQ10. The regulator
has a fixed flow rate of 0.3 L/min. Do
not use a flow rate lower than
0.25 L/min or higher than 1.0 L/min.
4. Turn on gas flow.
5. Press and release the READ key to begin
a zero reading. The Model IAQ10 begins
a 60-second countdown during the zero
reading. The actual zero reading is
taken in the last 10 seconds. When the
countdown is completed, the display
11
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indicates “SPAN” and the span concen-
tration.
6. Install the regulator on the span calibra-
tion cylinder and connect tubing from
the regulator to the inlet fitting on the
top of the Model IAQ10.
7. Use 5 and 6 to adjust the concentra-
tion displayed on the Model IAQ10 to
match the concentration on the span gas
cylinder.
8. Press and release the READ key to take
a span gas reading. The Model IAQ10
starts a 60-second countdown. When the
countdown reaches zero, the instrument
returns to the normal measurement
mode.
9. With the gas still connected, observe the
reading on the display. It should indi-
cate the span gas concentration. If not,
repeat this procedure.
10.If the displayed reading is accurate,
remove the regulator and tubing. The
calibration is now complete.
11.Before taking measurements, turn the
instrument off and move DIP switch #7
back to OFF.
12
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SECTION 8
Troubleshooting of the Model IAQ10
This table lists the symptoms, possible
causes, and recommended solutions for the
Model IAQ10.
Possible
Causes
Corrective
Action(s)
Symptom
No display Unit not
switched on
Switch on the
unit
Low or dead Replace the
batteries batteries
Dirty battery Clean the
contacts
battery
contacts
Refer to
battery
illustration
inside battery
cover
Batteries
installed
incorrectly
BAT is
blinking
Dirty battery Clean the
contacts
Batteries are
low
battery
contacts
Replace the
batteries
Cal err
Error in field Perform
calibration
calibration
again
13
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Possible
Causes
Corrective
Action(s)
Symptom
Display
reads “LO” low
Batteries are
Replace the
batteries
Note: If your symptoms are not remedied
by the suggested corrective action, call TSI
Instruments Ltd.
SECTION 9
Internal DIP Switch Settings
To access the DIP switches, remove the
batteries from the battery compartment. On
the inside of the battery compartment,
there is a window with eight DIP switches.
The table below shows the functions for
each switch.
CAUTION:
Make certain that power is turned off before
changing DIP switch settings.
14
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DIP
Switch
OFF
ON
1-3
4
5
Must be OFF
not assigned
not assigned
Beep is turned
OFF
-----
not assigned
not assigned
Beep is turned
ON
6
7
8
Normal mode
Field Verifica-
tion mode
not assigned
not assigned
-
The ON position is away from the batteries
and OFF is towards the batteries.
-
Switch 1 is towards the top of the case and
Switch 8 is nearest the bottom.
15
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Specifications
(subject to change without notice)
CO2 Sensor type:
Dual wavelength detector with non-
dispersive infrared (NDIR) sensor
Range:
0 to 5000 ppm
Accuracy
±3% of reading or ±50 ppm, whichever
is greater1, 2
Resolution
1 ppm
Response time <10 minutes in still air
Operating Temperature Range:
5 to 70°C
External Meter Dimensions:
89 mm × 168 mm × 41 mm
Display:
LCD, 4 digits, 10-mm high
Power requirements:
Four (4) AA-size alkaline batteries
Battery Life:
Minimum 10 hours using alkaline
batteries
1
Add ±0.36% of reading per °C away from calibration temperature
Under standard barometric pressure of 29.92 in Hg (406.8 inches H2O)
[101.4 kPa].
2
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TSI Instruments Ltd.
Lancaster Road
October 2005
Printed in USA
Cressex Business Park
High Wycombe
Part No. 1980532, Rev. A
Buckinghamshire
HP12 3QP England
Tel: +44 (0) 149 4 459200
Fax: +44 (0) 149 4 459700
E-mail: [email protected]
Copyright © 2005
TSI Incorporated
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