Airflow Systems Carbon Monoxide Alarm IAQ10 User Manual

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  
Copyright © 2005  
TSI Incorporated  
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