OPERATION MANUAL
WALL-MOUNT CO MONITOR
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Model:
2
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
7721
77231
7722
77232
INTRODUCTION
Thank you for purchasing this wall mount
CO mo nitor. It measures CO level, air
2 2
temp., dew p oint, wet bulb temp. and
humidity(DP, WB, RH are for mo dels
7722/77232) and is an ideal instrument
for in door 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
level and air ventilation become widely
applied in public areas such as offices,
classrooms , factories, hospitals and
hotels. It i s also suggested in regulations
of industrial hygiene in some countries.
(See appendix)
With N DIR (n on-dispersive infrared)
sensor used, this CO mo nitor is stable
in long term monitoring. And the built-in
relay for alarm output is especially
helpful in ventilation control and HVAC
syste m performance verification.
Features:
Tri ple dis plays o f CO level, temp.
and humidity (7722/77232).
Stable NDIR sensor for CO detection
Stati stics o f weighted average
TWA (8 h our s wei ghted average)
STEL(15 mi nut es we ighted average)
Visible and audile CO wa rning a larm
Alarm output for ventilation control
ABC(Automatic Baseline Calibration)
and manual CO
PC connect
2
2
2
2
calibration
2
via RS232 interface
s
2
1
MATERIAL SUPPLIED
This package contains:
Meter
Adaptor
Operation manual
Plain white box
Optio nal accessory:
33% calibration salt (VZ0033AZ1)
75% calibration salt (VZ0075AZ1)
RS232 cable and software
POWER SUPPLY
The meter is powered by an AC adaptor
(12V/1A output).
LCD DISPLAY
MAX MIN AVG TWA STEL PPM
CO
CO
2
ALM
Air temp .
Dew poin t
Wet b ulb
temp. in
o
C or F
HLD
OO
o
Symbols
MAX/MIN Ma xim un/ Minimum readings
TWA Tim e wei ght ed average(
STEL hort-te rm ex pos ure limit
(15 minute s wei ght ed
DP De w point temperatur e(7 722,772 32)
AIR Air temperature
WBT Wet bu lb te mperature(7722, 77232 )
% Unit of rela tiv e hum idi ty
o
E (C/F) Cels ius /Fa hre nheit
AVG/ CO/ALM/HLD/
Vain i cons in these models
S
CO2
concen tra tion
in ppm
%%
Relati ve
humidi ty in %
8 hours)
average)
2
KEYPAD
Enters set up mo de.
SETSET
Saves and fi nis hes s ettings.
CAL
CAL
Enters CO calibr ati on wi th .
ESC
ESC
Enters RH ca lib rat ion with .
2
DP/WB
X
AVG
N
M /
Exits setu p pag e/m ode.
Resets the m ete r and c lear MAX/MIN.
RESETRESET
Terminates d uri ng ca libration.
Selects AIR , DP, WBT temps display.
DP/WB
(7722/77 232 o nly )
or
Selects mo de or i ncr eases value in
calibrat ion a nd se tup.
X
AVG
N
M /
Activate s MAX , MIN , STE L,TWA fun cti on.
Selects mo de or d ecr eases value in
calibrat ion a nd se tup.
OPERATION
POWER O N/OFF
Plug in the adaptor and the meter turns
on automatically with a short beep. It
performs 30 seconds countdown(Fig.1)
for met er warm up, then enters normal
mode with current CO , temperature,
and humidity(7722/77232) readings
displayed (Fig.2).
PPM
CO2
OO
Model 77 21/ 77231
2
CO2
Fig. 2
Model 77 22/ 77232
Fig. 1
OO
PPM
%%
3
TAKING MEASUREMENT
The meter star ts taki ng measurement
after p ower on and updates readings
every second. In the condition of opera
-ting environment change (ex. from high
to low te mp.), it takes 3 0 sec to re spond
for CO s ensor and 30 minutes for RH.
2
NOTE: D o not hol d the meter close to
faces in case that exhalation affects
CO levels.
2
AIR(a ll models),DP,WBT( 7722/77232)
Press to switc h tempe ratur es
DP/WB
display. Th e lower l eft dis play wi ll cycl e
from ai r temperature, dew point temp.
(Fig.3), and wet bulb temp.(Fig.4).
CO2
MAX,M IN, STE L,TWA
PPM
OO
Fig.3
CO2
%%
Under normal mode, press to se e
the minimum, maximum, and weighted
average readings. Each press of ,
it displays MIN, MAX, STEL, TWA in
sequence and returns to normal mode.
In MIN an d MAX mod es, it sh ows the
minimum and maximum readings of
CO on ma in display and of AIR or DP
2
or WB tem perature and humidity
/77232)
on the lower displays. (Fig.5)
CO2
PPM
%%
OO
4
OO
Fig.4
X
AVG
N
M /
Fig.5
PPM
%%
X
AVG
N
M /
(7722
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