HTA 77596, 77597 Operation Manual
OPERATION MANUAL
PORTABLE IAQ METER
Model:
77597, 4 in 1
77596, 3 in 1
INTRODUCTION
1
Thank you for purchasing this portable
IAQ meter. The meter measures CO
2
level,CO level, air temp., dew point, wet
bulb temp. and humidity(DP, WB, RH are
for models 77597 only) and is an ideal
instrument for indoor air quality (IAQ)
diagnosis.
Poor indoor air quality is considered
unhealthy because it causes tiredness,
loss of ability to concentrate, and even
illness(ex. Sick Building Syndrome). IAQ
monitoring and survey, especially on CO
2
level and air ventilation become widely
applied in public areas such as offices,
classrooms, factories, hospitals and
hotels. It is also suggested in regulations
of industrial hygiene in some countries.
(Appendix)
The portable CO meter uses NDIR (non-
2
dispersive infrared) technology to ensure
the reliability and long term stability. It’s
useful in verifying HVAC system performance and air ventilation control.
CO is a colorless, odorless, and tasteless
gas which is slightly lighter than air. It is
highly toxic to humans and animals.
Maximum indoor air quality level per
ASHRAE Residential standards 62-1989
for living area is under 9ppm. Besides, it is
also necessary to remove employees from
enclosed space if the CO concentration
exceeds100ppm per OSHA exposure limit.
Please refer to Appendix for the details.
Features:
Big LCD display with blue backlight
to use in dark area
One touch to display CO2 /Dew point
temperature/Wet bulb temperature/
Air temperature/Humidity/CO in turns.
Designed with NDIR (non-dispersive
infrared) Waveguide technology CO2
sensor
Programmable warning CO level
Long time drift compensation on CO2
sensor
Audible alarm (~80db)threshold setting
Max, Min, TWA, STEL functions included
Mini USB to PC download function for
analysis
99 points manually recording
32000/24000 points auto recording
Review 99 points manual record
Hold function freezes current readings
Housing design surrounds with rails to
help Air ventilation for quick & accurate
response
Easy to manually calibrate CO2 at
fresh air around 380-420ppm
MATERIAL SUPPLIED
Meter
4pcs AA batteries
Mini USB cable and software CD
Operation manual
Hard carrying case
This package contains:
Optional accessory:
33% calibration salt (VZ0033AZ1)
75% calibration salt (VZ0075AZ1)
Adaptor (9V/100~240Vac)
2
POWER SUPPLY
The meter is powered by either 4 AA
batteries or a DC adaptor(9V/1A output).
Install the batteries into the battery
compartment on the rear and make sure
they are in correct polarity and good
contact.
will
appear on the LCD .
atter
When an adaptor is used, it will
cut off the power supply from batteries.
The adaptor can’t be used as a battery
charger.
When battery voltage gets low,
(Fig.1)
The CO sensor can’t work normally
2
under low voltage, please replace with
fresh b ies or connect with an
adaptor.
3
B
CO2
PM
B
Fig.1
HOLDHOLD
CO2
%rhrh
TA
DP
WBT
OO
FF
OO
CC
REC
Recall
AM
PM
CO
CAL
B
MINMIN
MAXMAX
AVGAVG
4
LCD DISPLAY
Upper LCD
MIN/MAX Minimum/Maximun readings
STEL Short-term exposure limit (15
minutes weighted average)
TWA Time weighted average(8 hours)
Low battery indicator
DP Dew point
TA Air temperature
WBT Wet bulb
%rh Unit of relative humidity (77597)
o
C/ F Celsius/Fahrenheit of temp.
CAL In calibration status
REC In manual/automatic logging
RECALL In manual records recall mode
CO2/CO/Temp....reading
Lower LCD Real time display
CO2 Carbon dioxide reading
CO Carbon monoxide reading
HOLD Readings are freezed unchanged
temperature(77597)
temperature(77597)
o
Symbols
Turns on and off the meter.
Enters setup mode while meter is off.
Sets as non-sleep mode with .
SET
START
ESC
Exits setup/recall page.
Start automatic logging.
KEYPAD
ON/OFF
MODE
RECALL
HOLD
Press to switch displayed mode.
Long press to enter memory recall mode.
TWATWA
STELSTEL
B
Freezes the current readings.
Selects unit or increases value in setup.
Cancels data hold function.
Press to manually record the reading.
Selects unit or decreases value in setup.
Activates MIN, MAX, TWA, STEL
function. Saves and finishes settings.
OPERATION
Press to turn the meter on and off.
At power up, it emits a short beep and
performs 30 seconds countdown(Fig.2)
for meter warm up, then enters normal
mode with current CO and real time
2
displayed (Fig.3). The real time display
date and time in turns.
Suggest to wait for 30 seconds warm up
time. For quick start, you may press
for 2 seconds to end the warm up
and entering normal display.
POWER ON/OFF
SET
ON/OFF
Fig.2
Fig.3
CO2
AM
TAKING MEASUREMENT
The meter starts measurement when
power on and update readings every
second. In the condition of operating
environment change (ex. from high to
low temp.), it takes 30 sec to respond
for CO sensor and 30 minutes for RH.
2
NOTE: Do not hold the meter close to
faces in case exhalation affects CO
2
levels.
N
X
M /AVG
5
HOLD
MEM
N
X
M /AVG
6
Press to switch to temperatures
display.(Fig.6). In 77597 model, dew
point temp. and wet bulb temp. are also
available.(Fig.7). The lower display
shows the real time clock.
AIR(all models),DP,WBT(77597)
Press to switch the mode to CO2.
User can get the CO2 reading in ppm
unit on main display.(Fig.4). The lower
display shows the real time clock.
CO2 (Carbon Dioxide)
MODE
RECALL
CO2
AM
Fig.4
Press to switch the mode to CO.
User can get the CO reading in ppm
unit on main display.(Fig.5). The lower
display shows the real time clock.
CO (Carbon Monoxide)
MODE
RECALL
CO
AM
Fig.5
MODE
RECALL
TA
OO
CC
PM
WBT
OO
CC
Fig.6
Fig.7
Press to switch to humidity display.
(Fig.8).The lower display shows the real
time clock.
Humidity (77597)
MODE
RECALL
%rhrh
Fig.8
DATA HOLD
In normal display mode, press to
freeze the readings, "HOLD” icon is
flashed on the left top of LCD(Fig.9). All
current readings are kept unchanged.
Press again to cancel the hold
function.
Fig.9
BACKLIGHT
The backlight will be activated for 10
seconds by pressing any key.
MIN,MAX,STEL,TWA, CURRENT REVIEW
This meter allows you to check the
minimun, maximun, STEL,TWA and
current value from the moment you press
the key. Under normal mode, press
to see the minimum, maximum,
STEL, TWA and current value in turns.
Each press of ,it displays MIN, MAX,
STEL,TWA, current value in sequence.
(Fig.10~12). To return to normal mode,
press key to escape(Fig.13)
If the meter is turned on for shorter than
15 mins, the STEL value will be the
weighted average of readings take since
power on. Same for TWA values appear
before 8 hours.
It takes at least 5 mins to calculate STEL
and TWA. The display shows “----” during
the first 5 mins from power on.
HOLD
HOLD
HOLDHOLD
%rhrh
AM
NOTE:
THE HOLD FUNCTION IS DISABLE IN MIN/MAX/
AVG MODE.
N
X
M /AVG
N
X
M /AVG
N
X
M /AVG
START
ESC
7
In this max/min/STEL/TWA/current
modes, it shows the corresponding
readings on main display and the
accumulated time of how long you are
in this mode.(Fig10~12).
NOTE:
“HOLD” & “MANUALLY
RECORD” & “RECALL”
FUNCTION ARE DISABLE
IN MIN/MAX/AVG MODE.
MODE
RECALL
CO
MAXMAX
Fig.14
START
ESC
While in “HOLD” mode, STEL and TWA
will remain updating every 5 mins.
CO2
MINMIN
CO2
CO2
CO2
AM
Fig.10
Fig.11
Fig.12
Fig.13
8
TWATWA
In this mode, press to switch the
displayed parameters. Fig 14.
The dispalyed sequence in this mode is
min max STEL TWA current min
max.....Press key can immediately
leave this mode and return to normal.
Distinguishing the normal display and
current review by checking the time
display format. In normal display, the
date & time displayed in turns. In current
review, the time display is the accumu-
lated time of how long you are in
max/min mode.
NOTE:
TWA &STEL ARE FOR CO2
ONLY.
MIN/MAX ARE FOR ALL
PARAMETERS.
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