OPERATION MANUAL
WALL-MOUNT CO MONITOR
Visit us at www.TestEquipmentDepot.com
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
In STEL and TWA mo des, th e main
display shows the
CO readings for the past 15 minutes
2
(STEL ) and 8 hours(TWA).
weighted average of
The lower
displays are the current AIR, DP/WB
temperatures and humidity (7722/
77232). (Fig.6)
PPM
CO2
STE L
%%
OO
Fig.6
NOTE:
1. If the me ter is tu rned on f or shor ter
than 15 m inutes, the ST EL va lue wil l
be the we ighted average of readings
taken since power on. Same for TWA
value s appear before 8 hours.
2.It ta kes at le ast 5 min utes to c alcul ate
STEL and TWA. The display shows
“---- ” (Fig.7) during the first 5 minutes
from po wer on.
STE L
CO2
%%
OO
Fig.7
ALARM & OUTPUT
ALARM
The meter features visible and audible
alarm to give warnings when CO concentration exceeds the limit. Users can
set up 2 limits: An u pper li mit for a larm
threshold that requires air conditioning
and a lower limit to stop the alarm.
(See P1.0 in setup for setting alarm
limits).
2
5
It emit s beeps(Abt. 80dB) with blinking
LED when CO level goes over the upper
2
limit. Beeps can be stopped by pressing
any key or automatically stops when
CO rea ding falls below lower limit.
2
If the be eper is temporarily shut, it will
sound again when readings fall below
lower limit and then go over the upper
limit again, or users press fo r more
RESETRESE T
than 1 second to activate it.
LED alarm keeps blinking when beeps
are manually shut. It stops only when
readings fall under the lower limit.
ALARM OUTPUT
Alarm
Out put
RS232
Adapto r
The meter is designed with a relay
to send output for furt her connection.
When CO readings go over the upper
2
limit and cause alarming. The relay
picks up automatically and send output.
It can be c onnected to a ventilation
syste m or acti vator for conditioning the
air quality. The rel ay will d rop out w hen
CO readings fall under the lower limit.
2
6
SETUP
Hold down under normal mode for
more th an 1 sec to enter setup mode.
To exit setup, press in P1. 0, P3.0 , or
P4.0 and it returns to normal mode.
Note:
P2.0 is not applicable in these models
but for f uture m odel with CO and CO
measurements.
SETSET
CAL
CAL
ESC
ESC
2
P1.0 CO ALA RM: UPPER&L OWE R LIMITS
2
When entering setup mode, P1.0 and
“AL” (F ig.8) are displayed on the LCD.
SETSET
Press again to g o into P1 .1 for se tting
CO upper limit. The curr ent set v alue
2
will be blinking on LCD(Fig.9).
CO2
Fig. 8
DP/WB
Press or to incr ease th e value o r
X
AVG
N
M /
to decr ease. E ach pre ss tune s 100
CO2
PPM
Fig. 9
ppm and the alarm range is from 100 to
9900ppm.
CAUTION:
It’s suggested to set up the alarm
value within specification range
that ac curacy is ensured. The out
of spec readings are only for
reference and not suitable to use
as alarm limits.
7
When th e preferred value is set, press
SETSET
to go int o P1.2 (F ig. 10) f or lowe r
limit setting. After both settings are
done, press to s ave or wi thout
SETSET
CAL
CAL
ESC
ESC
saving and return to P1.0 .
CO2
PPM
Fig. 10
P3.0 TE MPERAT URE SCA LE
DP/WB
Press in P1.0 to a ccess P 3.0 for s etting up temperature scale(Fig.11).
SETSET
Press and it goe s into P3 .1 with
blinking C or F current set(Fig.12) on
the lower left display. To switch C or F,
press or . Then press to save
the setting or withou t savin g and
DP/WB
o o
X
AVG
N
M /
CAL
CAL
ESC
ESC
o o
SETSET
return to P3.0
OO
Fig. 11
Fig. 11
Fig. 12
P4.0 ABC SEL ECTIO N
ABC (Au tomatic Baseline Calibration)
is to imp lement baseline calibration to
eliminate the zero drift of the infrared
sensor. The ABC function default is off
when turning on the meter. Users can
enable it by following the procedure.
DP/WB
Press in P3.0 or i n P1.0 to a ccess
X
AVG
N
M /
P4.0 fo r selecting ABC function.(Fig.13).
CO2
Fig.13
8
SETSET
Press and it goe s into P4 .1 with
blinking “dis” default (Fig.14) on the
lower left display. To enable the ABC
function, press or an d “En” bl inks
for cho ice(Fig. 15). After th e preferred
selection is done, press to sa ve the
setti ng or wit hout sa ving and return
CAL
CAL
ESC
ESC
X
AVG
N
M /
DP/WB
SETSET
to P4.0
CO2
Fig. 14
CO CALIBRATION
2
CO2
Fig. 15
The meter is calibrated at standard
400ppm CO concentration in factory.
2
It’s suggested to do either ABC or
manual calibration regularly to maintain
good accuracy.
Note:
When th e accuracy becomes a concern
after a l ong time usage or other special
conditions, return to dealers for standard
calibration.
CAUTION:
1. Do not calibrate the meter in the
air wit h unknown CO level.
2
Other wise, i t will be t aken as 400
ppm and l eads to inaccurate
measu rements.
2. When o perating the meter in the
close i ndoor areas that are not
venti latin g,
offices with windows shut,
to disable the AB C funct ion to
prevent incorrect calibration.
such as hospitals or
be sure
9
ABC (Au tom atic Baseline C ali bra tio n)
ABC is to c alibrate the meter at the
minimum CO reading detected during
2
7 days continuous monitoring (power
on). It i s suppo sed that the ventilating
area can have fresh air with CO level
2
in around 400ppm during a period of
time. It’s not suitable to implement
ABC in close area with higher CO level.
2
The ABC default is off. To enable t he
function, please refer to SETUP P4.0.
Manua l Calib ratio n
The manual calibration is suggested to
be done in outdoor area with ventilating
fresh a ir where CO level is around 400
Do not calibrate in places crowded
ppm.
2
with people or close to where with high
CO concentration such as ventilating
2
outlets or fireplaces.
Place the meter in the calibration site.
Tur n on the me ter and h old dow n
DP/WB
and sim ultan eously to enter CO
CAL
CAL
ESC
ESC
2
calibration mode (Fig.16). 400ppm and
“CAL” are blinking on the LCD while
performing calibration.
CO2
PPM
Fig. 16
Wai t about 5 m inute s until t he blin king
stops and the calibration is completed
automatically and return to normal
mode.
To abort the calibration, press for
RESETRESE T
more th an 1 second.
10
RH CALIBRATION
(7722/77232)
The meter defaults to be calibrated the
humidity with 33% and 75% salt solution.
The ambient condition is recommended
to be at 25 C and s table h umidi ty(be tter
o
to be close to the calibrating value). To
abort calibration, hold down for more
RESETRE SET
than 1second at any time.
CAUTION:
Do not calibrate the humidity without
the default calibration salt. Otherwise,
it will cause permanent damage.
Contact the dealer for calibration salt
or services.
33% calibration
Plug the sensor probe into 33% salt
bottle. Hold down and under
X
AVG
N
M /
CAL
CAL
ESC
ESC
normal mode to enter 33% calibration
(Fi g.17). “CAL” and calibrating value
(32.7% if at are blinking on the
o
25 C)
LCD with current temperature at the left.
Meter is now calibrating, and will finish
in about 60 minutes when “CAL” and
humidity stop blinking. (Fig.18)
OO
Fig. 17
%%
Fig. 18
%%
OO
75% calibration
After 3 3% calibration, plug the sensor
probe into 75% salt bottle, then press
SETSET
to ente r 75% cal ibrat ion (Fi g.19).
11
%%
OO
“CA L” and calibrating value (75.2% if
o
at 25 C) are blinking o n the LCD with
Fig.19
current temperature at the left. Meter is
now calibrating. Wait about 60 minutes
until blinking stops, then calibration is
completed and it returns to normal mode.
NOTE:
Users can also calibrate either point.
To calibrate 33% only, press to exit
when 33% calibration is completed.
To calibrate 75% only, press or
CAL
CAL
ESC
ESC
X
AVG
N
M /
DP/WB
within 5 minutes while initializing 33%
calibration. And it skips 33% and enters
75% calibration mode.
TROUBLESHOOTING
? Can’t power on
Check whether the adaptor is well
plugged.
? Slow response
Check whether the air flow channels on
the rear were blocked.
? Error messages
E01: CO sensor damaged.
E02: The value is under range.
E03: The value is over range.
E04: The original data error results in
this error (RH, DP, WB)
E07: Too low voltage to measure CO
E11: Retry humidity calibration.
E17: Retry CO calibration.
E31: Temperature sensor damaged.
E34: Humidity sensor damaged.
2
2.
Check if the adaptor output is 12V.
2
12
PC CONNECTION
7721 7722 77231 77232
Resolution
Accuracy
Pressure
Dependence
Range
Resolution
Accuracy
Range N/A 0.0~99.9% N/A 0.0~99.9%
Resolution N/A 0.1% N/A 0.1%
±3%(10~90%) ±3%(10~90%)
±5%(others) ±5%(others)
Warm up
Operating
Storage
Power
±30ppm±5%rdg(0~5000)
Not specified for out of scale
-10.0~60.0℃ (14~140℉)
0.1℃/0.1℉
+1.6% reading per kPa deviation from
normal pressure, 100kPa
Temp.
CO2
Humidity
Range
1 pp m 1 pp m
0~2000ppm
2001~9999(out of scale)
0~5000ppm
5001~9999(out of scale)
±50ppm±5%rdg(0~2000)
Not specified for out of scale
Accuracy
30 seconds
0~50℃, 0~95%RH (avoid condensation)
±0.6℃/ ±0.9℉
-20~60℃, 0~99%RH (avoid condensation)
12V adaptor
N/A N/A
The meter can do PC link for
logging and via RS232
data analysis
interface and software.
The protocol is as follows.
A.9600 bp s, 8 d ata bits, n o parity.
B.For mat (AS CII )
Model 7 721/7 7231
Cxxxx ppm:T xxx.x C(F) LR C CRLF
Descript ion : $CO 2:A ir LR C CRL F
Model 7 722/7 7232
Cxxxx ppm:T xxx.x C(F): Hxx.x %:
dxxx. xC(F) :wxxx .xC(F ) LRC CRL F
Descript ion : $CO :Air:RH :DP :WB T LRC
CRLF
2
on-line
SPECIFICATION
13
Appen dix
CO2 LEVELS AND GUIDELINES
Non -Enf orced Reference lev els
NIOSH r eco mme nda tions
250-3 50 pp m: no rma l outdoor ambient
concentr ati ons
600 ppm : min ima l air q uality compla int s
600-1 000 p pm: l ess c learly interpret ed
1000 pp m: in dic ate s inadequate venti lat ion ;
complain ts su ch as h eadaches,
fatigue, a nd ey e/t hro at irritation
will be more w ide spr ead. 1000
ppm should b e use d as an u pper
limit for in doo r lev els.
EPA Taiwan: 600ppm and 1000 ppm
Type 1 in door areas such as depa rtme nt
stores, t heaters, restaurants, l ibraries,
the accep table CO2 concen trat ion of 8
hours ava rge is 1000ppm.
Type 2 in door areas with speci al requirements
of good air q uality such as school s,
hospita ls, day care centers, the
suggest ed CO2 level is 600p pm.
Reg ulat ory exposure limit
ASH RAE St andard 62-1989: 1000ppm
CO2 c once ntration in occupie d buil ding should
not e xcee d 1000ppm.
Bui ldin g bull etin 101 (BB101 ):
UK standa rds for schools say tha t CO2 at
ave rage d over the whole day(i. e. 9am t o 3.30
pm) s houl d not exceed 1500ppm.
OSH A: 500 0ppm
Time w eighted average ove r five 8 -hour work
day s shou ld not exceed 5000ppm .
Ger many, Japan, Austr alia , UK.. .: 5000ppm
8 hou rs wei ghted average in occu pational
exp osur e limit is 5000ppm.
1
150 0ppm
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