Duomo Vent Check Pro User Manual

Keypad (Fig.1)

3

56

4

21

A

A

B

B

C

C

B
C

Vent Check Pro (CO + CO2)

Operation

Press button 1 to turn the meter
on and off.

After a 30 second warm-up the
meter is ready to use and will
display the normal operating
screen (Fig. 2). To sk ip the warm
up, press and hold button 6 for 2
seconds. It is advisable, however,
to allow the unit to perform its full
setup.

During operation the display will
automatically cycle through the
current level of CO

2

and CO. Press
button 5 to see the current air
temperature.

Pressing button 6 will cycle
through minimum, maximum,
average and current readings. In
this mode the time at the bottom
will change to show you how long
youhavebeeninthismode.

Pressing any button will turn the backlight on for 10
seconds.

The unit will turn off automatically after 20 minutes of
inactivity.To override this function, turn the unit off then
restart it by holding down button 2 then turning it on
with button 1.

The meter will take a new reading every second. When
the operating conditions change, the unit will respond
in 30 seconds for CO

2

.

When battery supply is low, 'Lob' will be displayed.
Change the batteries or connect the DC adaptor.

NOTE: Do not hold the meter close to the face as
exhalation can affect CO

2

readings.

Normal Operation
(Fig.2)

A =Current

measurement
type (CO

2

,CO

or TA)

B = Current level
C = Current date /

time

Triple reading and display of CO2, CO and
temperature
NDIR sensor for CO

2

detection
Datalogging capability (downloadable via USB)
Statistics of weighted averages
BS8494 compliant (from 10 - 60 ºC)
Backlight for working in dark areas
Programmable and audible warning alarms
Easy manual fresh air correction on CO

2

PC connection via USB interface
With hard case and power adaptor
Can be used with rechargeable batteries

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A

cycle through the minimum, maximum and average
readings of each parameter automatically. To return to
normal mode,press button 3.

Pressing button 2 will hold all current readings and HOLD
flashes in the top left of the screen. Press again to exit hold
mode.

Recording (Manual)

The Vent Check Pro can manually record up to 99 points
of data.

In normal mode, press button 4 to record a data point.
The REC icon flashes on screen for about 3 seconds and
the screen displays the data point number (1 - 99). Each
point recorded contains information on the current CO

2

,

CO and air temperature.

You can view all manually recorded data points at any
time by using button 5. Press and hold it for 2 seconds

V

e

nt

Che

c

kPro

or more until 'Recall' appears on screen.

Press buttons 2 and 4 to cycle up and down through all
recorded data points stored on the unit. The data point
number will appear on screen first, followed by the stored
reading. Pressing button 5 will then cycle through each
parameter. The time at which the data was recorded will
also appear at the bottom of the screen.

To exit the recall mode, press button 3.

Recording (Automatic)

As well as recording data manually,the Vent Check Pro also
allows you to datalog automatically.The unit can store up
to 30,000 data points (10,000 data points each for CO

2

,CO
and temperature). The sampling rate can be altered in the
advanced setup menu and can be set from 1 second to 4
hours, 59 minutes and 59 seconds.

To begin datalogging press button 3 for 2 seconds. The
REC icon will flash at the bottom of the screen. Pressing
button 3 again for 2 seconds will stop the datalogger.
NOTE: Each time you star t the datalogger you will
overwrite the previously recorded data.

During datalogging you can still cycle through all three
parameters.

Setup

To enter setup, make sure the unit is turned off then press
and hold button 1 for more than a second. To exit this at
any time,simply press button 3.

There are six setup options within this menu;

Use buttons 2 and 4 to cycle through each of the six
options and their parameters and then button 6 to
confirm a selection.

CLr

To delete all manually stored data points scroll to 'yes' and
confirm your selection. Press button 3 at any time to
escape back to the top menu.

ALAr

To set the audible alarm threshold for CO & CO

2

detection,
scroll through to the level required and confirm your
selection. Available levels range from 15 to 200ppm in
5ppm increments for CO and 400 to 2000ppm in 50ppm
increments for CO

2

.

unit

Select whether to display the temperature on screen
using degrees centigrade or fahrenheit.

rATE

Press button 6 to start setting the sampling rate. The
hours will flash first, use buttons 2 and 4 to set. Pressing
button 6 to move on to the minutes and repeat with the
seconds. The final push of button 6 will confirm your
selection and return to the main menu. The range is from
1 second to 4 hours,59 minutes and 59 seconds.

PrES

If operating at high altitudes the barometric pressure
value of this unit may need adjusting from the standard
of 1013hPa.(Range is 700 - 1990hPa).

rtC

The first option that appears is whether to use the 24
hour clock or not. Select 24 or 12, confirm your selection
then set the date (day, month, year) using buttons 2 and
4, followed by 6 to set it. The time can then be set (hours,
minutes,seconds) by the same method.

Fresh Air Correction & Calibration

CO2Fresh Air Correction

It is strongly suggested that the unit be corrected in a
sunny, outdoor environment that is well ventilated. Do
not correct the unit in places crowded with people or
close to areas with high CO

2

concentration such as

ventilating outlets or fireplaces.

To correct the unit for CO

2

make sure that it is turned off
and place it in the calibration site. Turn it on by pressing
and holding buttons 1, 3 and 4 for 3 seconds.The unit will
enter calibration mode. There are three different
calibration options available to perform. Select the CO

2

option and pres button 6 to start calibrating. After about
5 minutes the unit will stop flashing and calibration will
be completed.

To abort correction at any time,simply turn the meter off.

CAUTION: The meter is corrected at ambient air of
around 400ppm. Do not correct the meter in an
environment with an unknown CO

2

concentration. Doing

this could lead to inaccurate measurements.

CLr - Clears all manually stored data points
ALAr - Determines the CO & CO

2

alarm threshold

unit - Changes the display between

o

C andoF

rATE - Sets the sampling rate for the datalogger
PrES - Pressure compensation for CO

2

measurement

rtC - Sets the date and time for the unit

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CO2Levels & Guidelines

ASHRAE Standard 62-1989: 1000ppm
CO

2

concentration in occupied building should not

exceed 1000ppm.

Building Bulletin 101 (BB101): 1500ppm
UK standards for schools say that CO

2

averaged over the
whole day (i.e. 09:00 - 15:30) should not exceed
1500ppm.

Troubleshooting

Specification

Can't power on

Press button 1 for more than 0.3 seconds and try
again. Check whether batteries are in good contact
and correct polarity is observed.

Fixed readings

Check whether data hold function was activated.

Slow response

Check whether the air flow channels on the rear are
blocked.

Error messages

E01: CO

2

sensor damaged
E02:The value is under range
E03:The value is over range
E04:The original data error results in this error
E07: Voltage to measure CO

2

. Replace batteries or
use an adaptor
E17: Retry CO

2

calibration

E31:Temperature sensor damaged

CO

2

Range of 0 - 9999ppm
Accuracy ± 30ppm ±5% of reading
Response time <30 seconds

CO

Range of 0 - 1000ppm
Accuracy: ± 10ppm at <100ppm

± 10% of reading for 101 - 500ppm
± 20% of reading for 501ppm and above

Response time <60 seconds

Temperature

Range of -20 - 60 ºC (-5 - 140 ºF)
Accuracy ± 0.6ºC (0.9 ºF)
Response time <2 minutes

Warm Up

30 seconds

Operating Ranges

From0~50ºC , 0 ~ 95% RH (avoid condensation)

Storage

From -20 ~ 60 ºC ,0 ~ 99% RH (avoid condensation)

Power

4 pcs AA batteries (rechargeable option),DC Adaptor

Battery Life

> 10 hours (Alkaline)

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OSHA: 5000ppm

Time weighted average over five 8-hour work days
should not exceed 5000ppm.

NIOSH recommendations:

250 - 350ppm
Normal outdoor ambient concentrations.

600ppm
Minimal air quality complaints.

1000ppm
Indicates adequate ventilation; complaints such as
headaches, fatigue and eye/throat irritation will be more
widespread. 1000ppm should be used as an upper limit
for indoor levels.

CO Levels & Guidelines

ppm Symptoms and applicable standard

0 - 1 Normal background levels

1600 Nausea within 20 min., death within2-3hrs

9

Maximum indoor air quality level:

Maximum allowable concentraion per

ASHRAE Residential standards 62-1989 for

living area

25

Maximum limit 8 hrs of continuous

exposure per California OSHA workplace

standards

35

Maximum 8 hrs average exposure level per

US OSHA workplace standards

50

Maximum concentration for continuous

exposure in any 8 hrs average level per

OSHA standards

100

Remove employees from enclosed space if
the CO concentration exceeds 100ppm per

OSHA exposure limit

200

Mild headache, fatigue, nausea and

dizziness within2-3hrs

800

Dizziness, nausea, convulsions, death within

2-3hrs

400

Frontal headache,life threatening after 3

hrs. Maximum concentration in flue gas per

the US EPA and AGA standards