11
Minimum and Maximum Readings
KEYPAD (CONTROLS)
1) MODE : CO mode,MAX/MIN.
2
TWA,STEL,lps%, cfm/P
(98138.98139.98538.98539 only)
2) SEL./R : Edit Date,Time or alarm level
Logger mode: Long press to key start/off.
3) TRH.M. : Temp. Humidity mode. DPT,WBT
(98138.98139.98538.98539 only)
Setting/ Next
4) UNIT
: Select Temp. unit and backlight
5) POWER : Enter date and time,alarm setting mode
OPERATION
(a) POWER ON/OFF
Plug with adaptor, meter turns on automatically . LCD
shows current CO , RH & Temperature, Date and Time.
2
Six(6) smiley icons indicate the indoor air quality level
and appear on the top of first layer display
Note:
(1) Reset time whenever you turn on the meter.
(2) Please use properly power source, input voltage: 100~240
VAC,50-60Hz
Output voltage: DC 7.5~9.0V
Output current: 0.5A,or the meter will be damaged.
(b) TAKING MEASUREMENT
The meter starts warmup for couple minutes after powered
on and updates reading every 6 sec.
Response time is 10 sec. for CO , 2 Sec. for RH.
2
If the operation environment changes (ex. From high to
low temp.), it takes approx. 30 sec. for CO sensor to
2
respond and approx. 30 minutes for RH into stable
measurement.
NOTE: Do not hold the meter close to your mouth
or any other source of CO .
2
3
( c) CO MODE
2
In the CO Mode, press
button to switch CO
2
2
MODE
display. The top layer of display will cycle 3 readings of
CO , Maximum, Minimum.
2
Note 1:
1)
MAXIMUM. MINIMUM:
The unit automatically records maximum reading
and minimum reading after powered on.
2)
RESET MAX/MIN:
Press
button to get MAX or MIN reading, under
MODE
MAX or MIN mode, Long press
button to clear
MODE
Max.or Min records,display will back to normal
measuremnt.If current CO reading is near MAX or MIN,
2
you will not be easy to see the difference.
CO
2
TWA
ppm
CO
2
STEL
ppm
CO
2
VENT.R
lps
%
ppm
CO
2
VENT.R
cfm/p
ppm
Note 2
(98138.98139.98538.98539 only)
:
1)
( Time Weighted Average 8 hours)
TWA:
The meter keeps updating the reading every minute. If
the meter has been powered on for less than 8 hours,
the TWA value will be the weighted average of readings
since powered on.
2)
(Short-Term Exposure Limit in 15 minutes
STEL:
weighted average)The meter keeps updating readings
every minute. If the meter has been powered on for less
than 15 minutes, the STEL value shows the weighted
average of reading taken since powered on.
4
3)
: Vent rate unit: Liters Per Second per person.
lps%
4)
: Vent rate unit: Cubic Feet per Minute per Person
cfm/p
Assuming a conference room with Max. capacity of = 200
persons , If designed ventilation rate= 7 l/s person
The amount of ventilation required= 1,400 l/s (or 5 040 CMH), if
,
number of person is 70, the amount of ventilation only need 490
l/s, we don’t need ventilate 1,400 l/s for saving energy.
(d) TRH MODE : Temperature / Relative Humidity mode
TRH
In the
Mode, the meter displays both related humidity
and air Temperature simultaneously.
Press
button, the second layer of display will
TRH.M
cycle from:
HU AIR TEMP.,
HU WET BULB,
(98138.98139.98538.98539 only)
HU DEW POINT
(98138.98139.98538.98539 only)
o
HUMIDITY
WET BULB
HUMIDITY
+
DPT
WBT
o
HUMIDITY
DEW POINT
HUMIDITY
+
o
AIR
TEMP
HUMIDITY
+
TEMPERATURE
HUMIDITY
(e) Temperature unit (°C or °F) selection
Press
button to toggle the temperature unit
UNIT
(°C or°F) .
o
AIR
TEMP
HUMIDITY
o
AIR
TEMP
HUMIDITY
5
CALIBRATION
ABC (Automatic Baseline Calibration
)
The monitor is designed with high accuracy NDIR CO sensor
2
with ABC (Automatic Baseline Calibration) function which
establishes a baseline calibration to eliminate the zero drift of
the infrared sensor.
The ABC function is always “ON” when the meter is turned on.
ABC is designed to calibrate the meter at the minimum CO
2
reading detected during 15 days continuous monitoring (During
power on without any disconnected).
MAINTENANCE
Cleaning and storage:
1). The meter should be cleaned with a damp cloth and mild
detergent when necessary.
2). Store the meter in an area with moderate temperature
and humidity.
DISABLE ABC FUNCTION
The meter is default with ABC for automatically
It assumes that the area being tested receives fresh air with a
CO level of approximately 400ppm at some period of time
2
during the seven days. It is not suitable to use desktop CO in
2
closed areas with consistently high CO levels 24 hours a day.
2
For example, if the monitor is located in 24 hours area, such as
hospital or convenient stores, these places usually exist high
CO reading, the ABC function should be turned off for not
2
being calibrated with high CO level.
2
6
ppm
Co
2
ppm
Co
2
Press
./
SEL R
Step2:Hold
+
MODE UNIT
Step1:Long press
turn off meter
POWER
Step3:Press
to enter ABC function.
POWER
Display shows below.
Step4:Press
to select AbcOn or off.
SEL/R
Step5:Long press
to save. Meter restarts
TRH/M
automatically.
The monitor automatically records minimum and maximum
CO2 levels
. To view the minimum and maximum readings
while in Normal Mode:
1. Press
MODE
to display the maximum reading.
2. Press
MODE
again to display the minimum reading.
3. Press
MODE
to return to Normal Mode.
To reset the minimum and maximum readings:
1. With the minimum or maximum reading displayed, press
MODE
for 2 seconds.
2. “Clr” will display and the monitor will return to
Normal Mode.
