Duomo Vent Check Pro Manual - Halaman 2

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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

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 start 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;

CLr - Clears all manually stored data points

ALAr - Determines the CO & CO

unit - Changes the display between

rATE - Sets the sampling rate for the datalogger

PrES - Pressure compensation for CO

rtC - Sets the date and time for the unit

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

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

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alarm threshold

C and

measurement

detection,

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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).

, CO

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

Fresh 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

ventilating outlets or fireplaces.

To correct the unit for CO

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

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

this could lead to inaccurate measurements.

Levels & Guidelines

ASHRAE Standard 62-1989: 1000ppm

concentration in occupied building should not

exceed 1000ppm.

Building Bulletin 101 (BB101): 1500ppm

UK standards for schools say that CO

whole day (i.e. 09:00 - 15:30) should not exceed

1500ppm.

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concentration such as

make sure that it is turned off

concentration. Doing

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averaged over the