-2-
b) The HHM intera ts with you to SETUP
operating parameters to mat h your installation. It
stores these parameters in non-volatile memory. You
an then SEND these parameters to the AQT-2000.
The HHM an also LOG data from the AQT-2000
and later DUMP it to a personal omputer. The
HHM is only used for SETUP and LOGGING of air
quality. It has no monitoring or ontrol fun tion and
an be dis onne ted from the installation on e the
AQT-2000 is programed. It is powered by the AQT-
2000.
) The demo kit ontains a 4 to 20mA analogue
panel meter onne ted to the urrent output of the
AQT-2000. In a typi al installation this 4 to 20 mA
signal would be fed dire tly to a damper a tuator to
ontrol its position.
The power supply powers the AQT-2000. It an be
plugged into any 110V outlet to operate the
demonstration kit. In permanent installations the
AQT-2000 requires a 12 to 30VDC power supply.
d) The hand held module has a serial output that
an be atta hed to the serial port of an IBM
ompatible PC or Ma intosh omputer. We offer a
pa kage ontaining a data download able whi h
powers a hand-held module and onne ts it to a PC
to download stored data to the graphing pa kage we
supply.
You an also use your own ommuni ations,
graphing and spreadsheet software for omplex
analysis.
If you have a real-time graphi al pa kage you an use
the supplied “Y” able to onne t the AQT-2000 and
the HHM-AQ to your PC to monitor and save air
quality data in real-time.
If you will be using a Ma intosh omputer you will
need to extend the supplied able with a null modem
onne tor and a MAC serial modem able. We
suggest you use Claris Works for ommuni ation
and graphing or use the harting software we supply
under Soft Windows.
3. PROGRAMMING
The AQT-S-420 and AQT-D-420 are fa tory
alibrated and programmed before delivery to the
ustomer. The analogue output hanges
proportionally to pollution level. If a 4-20mA output
has been hosen 4mA represents the best possible air
and 20mA represents the worst.
We use medi al air to alibrate the 4mA setting.
Readings this good will not normally be a hieved in
operating onditions. Readings of 8mA or less
indi ate ex ellent indoor air quality while 16mA or
more is poor.
In general pra ti e anything less than 1/3 s ale
(9.3mA) is usually onsidered very good and not in
need of any a tion. Between 1/3 and 2/3 s ale
(14.6mA) progressive stages of filtering or leaning
are employed to improve air quality. Suffi ient fresh
air is normally introdu ed to prevent air quality
readings ex eeding 2/3 s ale (14.6mA).
Although the air quality monitor is ready for
operation as re eived from the fa tory the available
hand held module serial kit are valuable tools to log
and graph air quality data to determine if and where
air quality monitors should be used. the hand held
module an also be used to re onfigure
or re alibrate an air quality monitor.
The following se tion des ribes the use of the hand-
held module and graphi al software. If you are
simply installing an air quality monitor you an skip
to se tion 6, whi h des ribes wiring hook up.
When powered on the HHM will display:
SELECT FUNCTION
SEND flashing
As you press the up/down arrow key SEND will
toggle to SETUP, DUMP , LOG and ba k to
SETUP
The first time the HHM is used press the up/down
arrow key until SETUP is displayed. Then press the
green enter key.
The unit will display:
HOW WILL AQT BE USED
TRANSMITTER flashing
As the up/down arrow key is pressed
TRANSMITTER toggles to CONTROLLER and
ba k again. Press the green ENTER key to sele t
your hoi e.
CONTROLLER should be hosen for use in a
portable lassroom or similar appli ation where the
AQT will monitor the onditions in a single room and
dire tly ontrol a fresh air damper to maintain air
quality. In this mode the AQT rea ts very qui kly to
hanges in air quality so it an provide additional
fresh air as more o upants enter a room or the
a tivity level in reases in the room.
TRANSMITTER should be hosen if several AQT’s
will send an analogue signal representing air quality
ba k to a entral ontrol system whi h will perform
the ontrol fun tion. In this mode the air quality
monitor produ es an analogue output signal
proportional to a user defined se tion of the air
quality spe trum.
If you hoose CONTROLLER go to A
If you hoose TRANSMITTER skip se tion A and
go to B
