General Tools CDM7722 User Manual
OPERATION MANUAL
WALL-MOUNT CO MONITOR
Model:
2
7721
77231
7722
77232
INTRODUCTION
Thank you fo r purc hasin g this wall mo unt
CO mo nitor. It measures CO level, air
2 2
temp. , dew p oint, wet bu lb temp . and
humidity(D P, WB, RH are for mo dels
7722/77232) and i s an id eal in strume nt
for in door a ir qua lity ( IAQ) d iagno sis.
Poor i ndoor air qu ality is con sider ed
unhealthy b ecaus e it ca uses t iredn ess,
loss o f abil ity to conce ntrat e, and even
illness(ex . Sick Build ing Sy ndrome ). IA Q
monitoring and su rvey, especially on CO
level and ai r vent ilati on bec ome wi dely
applied in public areas such a s offices,
class rooms , fact ories , hosp itals and
hotel s. It i s also sugge sted i n regu latio ns
of ind ustri al hyg iene i n some count ries.
(See a ppend ix)
With N DIR (n on-di spers ive in frare d)
senso r used , this CO mo nitor is stable
in long term monit oring . And th e buil t-in
relay for al arm ou tput i s espe ciall y
helpful in v entil ation contr ol and HVAC
syste m perf orman ce ver ifica tion.
Featu res:
Tri ple dis plays o f CO level , temp.
and humidity ( 7722/ 77232 ).
Stabl e NDIR se nsor fo r CO detection
Stati stics o f weigh ted ave rage
TWA (8 h our s wei ghted average)
STEL(15 mi nut es we igh ted average)
Visible and audile CO wa rning a larm
Alarm o utput f or vent ilati on cont rol
ABC(A utoma tic Bas eline C alibr ation )
and manual CO
PC conn ect
2
2
2
2
calibratio n
2
via RS2 32 inte rface
s
2
1
MATERIAL SUPPLIED
This pa ckage c ontai ns:
Meter
Adaptor
Opera tion ma nual
Plain white bo x
Optio nal acc essor y:
33% calibration sal t (VZ00 33AZ1 )
75% calibration sal t (VZ00 75AZ1 )
RS232 cable an d softw are
POWER SUPPLY
The met er is pow ered by a n AC adapt or
(12V/ 1A outpu t).
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
Symbo ls
MAX/MIN Ma xim un/ Min imum readings
TWA Tim e wei ght ed average(
STEL hort-te rm ex pos ure limit
(15 minutes 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 ett ings.
CAL
CAL
Enters CO calibr ati on wi th .
ESC
ESC
Enters RH ca lib rat ion w ith .
2
DP/WB
X
AVG
N
M /
Exits setu p pag e/m ode .
Resets the m ete r and c lea r MAX/MIN.
RESETRESET
Terminates d uri ng ca lib ration.
Selects AIR , DP, WBT temps display.
DP/WB
(7722/77 232 o nly )
or
Selects mo de or i ncr eas es 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 eas es value in
calibrat ion a nd se tup .
OPERATION
POWER O N/OFF
Plug in the adap tor and t he mete r turns
on auto matic ally wi th a shor t beep. I t
perfo rms 30 se conds c ountd own(F ig.1)
for met er warm u p, then e nters n ormal
mode with curr ent CO , temperature,
and humidity (7722 /7723 2) read ings
displayed (F ig.2) .
PPM
CO2
OO
Model 77 21/ 77231
2
CO2
Fig. 2
Model 77 22/ 7723 2
Fig. 1
OO
PPM
%%
3
TAKING MEASUREMENT
The met er star ts taki ng meas ureme nt
after p ower on a nd upda tes rea dings
every s econd . In the co nditi on of ope ra
-ting e nviro nment c hange ( ex. fro m high
to low te mp.), i t takes 3 0 sec to re spond
for CO s ensor a nd 30 min utes fo r RH.
2
NOTE: D o not hol d the met er clos e to
faces i n case th at exha latio n affects
CO levels.
2
AIR(a ll mo dels),DP,WBT( 7722/77232)
Press t o switc h tempe ratur es
DP/WB
display. Th e lower l eft dis play wi ll cycl e
from ai r tempe ratur e, dew po int tem p.
(Fig. 3), and w et bulb t emp.( Fig.4 ).
CO2
MAX,M IN, STE L,TWA
PPM
OO
Fig.3
CO2
%%
Under normal m ode, pr ess to se e
the min imum, m aximu m, and we ighte d
avera ge read ings. E ach pre ss of ,
it disp lays MI N, MAX, S TEL, TWA in
sequence and return s to norm al mode .
In MIN an d MAX mod es, it sh ows the
minimum and ma ximum r eadin gs of
CO on main display and of AIR or DP
2
or WB tem perat ure and h umidi ty
/7723 2)
on the lo wer dis plays . (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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