Ponpe 7752 User manual

OPERATION MANUAL
PORTABLE CO METER
2
Model:
7752
77532
7755
77535

INTRODUCTION
Features:
Triple displays of level, temp.
and humidity (7755/77535).
s
asy calibration
humidity
PC connect
CO2
Stable NDIR sensor for CO detection.
2
Statistics of weighted average
TWA (8 hours weighted average)
STEL(15 minutes weighted average)
Backlight for working in dark area.
Audile CO warning alarm.
2
Battery and adaptor power supply.
E manual on CO and
2
(RH for 7755/77535 only).
via RS232 interface.
1
Thank you for purchasing this portable
CO meter. The me ter measures CO
2 2
level, air temp ., dew point, wet bulb temp .
and humi dity(DP, WB , RH are for models
7755/77535) and is an ideal instrume nt
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 CO2
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.
(See Appendix)
The portable CO me ter uses NDIR (non-
2
dispersive infrared) technology to ensure
the reliability and long term stability. It’s
useful in verifying HVAC system perform-
ance and air ventilation control.

MATERIAL SUPPLIED
Meter
4pcs AA batteries
Operation manual
Hard carrying case
This package contains:
Optional accessory:
33% calibration salt (VZ0033AZ1)
75% calibration salt (VZ0075AZ1)
RS232 cable and software
Adaptor (9V/100~240Vac)
POWER SUPPLY
The meter is powered by either 4 AA
batteries or a DC adaptor(9V/1A output).
OO
CO2
7752/77532
%%
OO
CO2
7755/77535
Fig.1
2
SET
Install the batteries into the battery
compartment on the rear and make sure
they are in correct polarity and good
contact.
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, a
(Fig.1)
The CO sensor
2
can’t work under low voltage, so it beeps
to indicate failed CO measurement
2
(press any key, except , to stop the
beeps) and the readings won’t be
displayed. Please replace with fresh
b ies or connect with an adaptor.
nd
"Lob" will appear on the LCD .
And beeper sounds.
atter

3
LCD DISPLAY
TWA Time weighted average(
STEL hort-term exposure limit
(15 minutes weighted
MIN/MAX Minimum/Maximun readings
Low battery indicator
DP Dew point temp.(7755,77535)
AIR Air temperature
WBT Wet bulb temp.(7755,77535)
% Unit of relative humidity
°E (C/F) Celsius/Fahrenheit
AVG/ftm
/m/s
8 hours)
S
average)
HOLD Readings are freezed unchanged
Vain icons in these models
%%
OO
TWA
STEL
HOLD
ftm
m/s
CO2
CO2
concentration
in ppm
Relative
humidity in %
Air temp.
Dew point
Wet bulb
temp. in
oC or F
o
Symbols
Turns on and off the meter.
Enters setup mode.
Sets as non-sleep mode with .
SET
CAL
Esc
DP/WB T
N
X
M /AV
Exits setup page/mode.
Enters CO calibration with .
2
Enters RH calibration with .
Freezes the current readings.
Cancels data hold function.
Activates or cancels the backlight.
Selects unit or increases value in setup.
Selects AIR, DP, WBT temps display.
(7755/77535 only)
Selects unit or decreases value in setup.
Activates MIN,MAX,STEL,TWA function.
Saves and finishes settings.
DP/WB T
KEYPAD

4
OPERATION
Press to turn the meter on and off.
When power on, it emits a short beep
and performs 30 sec countdown(Fig.2)
for meter warm up, then enters normal
mode with current CO , temp., and
2
humidity(7755/77535) readings
displayed (Fig.3).
SET
%%
OO
CO2
Fig. 2
Fig 3
Model 7752/77532 Model 7755/77535
DP/WB T
%%
OO
CO2
%%
OO
CO2
Fig.4 Fig.5
TAKING MEASUREMENT
OO
CO2
Press to switch temp. display.
The lower left display will cycle from air
temp., dew point temp. (Fig.4), and wet
bulb temp.(Fig.5).
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.
POWER ON/OFF
AIR(all models),DP,WBT(7755/77535)

DATA HOLD
Press to freeze the readings,
"HOLD" icon is displayed on the left
top of LCD(Fig.6). All current readings
are kept unchanged, except STEL and
TWA. Press again to cancel the
hold function.
%%
OO
HOLD
CO2
Fig.6
In MIN and MAX modes, it shows the
minimum and maximum readings of
CO on the upper LCD and of AIRor Dpor
2
WB temp. and humidity
on the lower LCD. (Fig.7)
(7755/77535)
N
X
M /AV
%%
OO
CO2
Fig.7
In STEL and TWA modes, the upper LCD
shows the
(STEL) and 8 hours(TWA).
weighted average of CO
2
readings for the past 15 minutes
The lower
LCD are the current AIR, DP/WB
temp. and humidity (7755/77535).
(Fig.8) 5
N
X
M /AV
BACKLIGHT
Hold down for more than 1 sec to
activate and cancel backlight function.
MIN,MAX,STEL,TWA
Under normal mode, press to see
the minimum, maximum, and weighted
average readings. Each press of ,
it displays MIN, MAX, STEL, TWA in
sequence and returns to normal mode.

%%
OO
STEL
CO2
Fig.8
NOTE:
1.
If the meter is turned on for shorter
than 15 minutes, the STEL value will
be the weighted average of readings
taken since power on. Same for TWA
values appear before 8 hours.
2.It takes at least 5 minutes to calculate
STEL and TWA. The LCD shows"----"
(Fig.9) during the first 5 minutes from
power on.
SET
%%
OO
STEL
CO2
Fig. 9
The meter turns off automatically after
20 minutes of inactivity. To override the
function, hold down and for 2
sec to turn on the meter until "n" appears.
NOTE: Auto sleep function will be disabled
during calibration mode.
6
SET
AUTO POWER OFF
ALARM
The meter features audible alarm to
give warnings when CO concentration
2
exceeds the limit. (See P1.0 in setup
for setting the alarm threshold). It emits
beeps (Abt.80dB) when CO level goes
2
over the set value and stops when any
key (except ) was pressed or
readings fall below the set value. It
beeps again when value goes over the
limit. Restartthe meter if beeper can't
be stopped.
3.While all readings are held unchanged,
STEL and TWA will keep updating
every 5 minutes.

SETUP
Hold down un
setup mode.
To exit setup, press in P1.0 or P3.0
and it returns to normal mode.
Note: P2.0 is not applicable in these
models but for future model with
CO and CO measurement.
2
P1.0 CO ALARM
2
When entering setup mode, P1.0 and
"AL" (Fig.10) are displayed on the LCD.
Press to enter P1.1 for setting CO
2
alarm threshold. The current set value
will be blinking on the LCD
Press to increase the value or
to decrease. Each press tunes
and the alarm range is from
100 to 9900ppm. When the preferred
alarm value is set, press to save
the setting or without saving and
return to P1.0.
P3.0 TEMPERATURE SCALE
Press or in to access P3.0
for setting up temp. Scale(Fig.12). Press
enter P3.1 with blinking °C or F
current set (Fig.13) on the lower left LCD.
To switch
press to save the setting or
without saving and return to .
der normal mode for
more than 1 sec to enter
(Fig11).
100ppm
P1.0
°
°C or °F, press and .
Then
P3.0
SET
CAL
Esc
N
X
M /AV
DP/WB T
N
X
M /AV
CAL
Esc
CO2CO2
Fig. 10 Fig. 11
DP/WB T
N
X
M /AV
DP/WB T
N
X
M /AV
Fig. 12 Fig. 13
7
OO
CAL
Esc

8
CO CALIBRATION
2
CAUTION:
Do not calibrate the meter in the air
with unknown concentration.
Otherwise, it will be calibrated as
400ppm by default and leads to
inaccurate measurements.
CO
2
CAL
Esc
CO2
Fig. 14
NOTE:
Ensure the batteries are with full voltage
during the calibration to prevent from
interruption or failed calibration.
The manual calibration is suggested to
to be done in fresh outdoor air that is
well ventilated and in sunny weather.
Wait about 5 minutes until the blinking
stops and the calibration is completed
automatically and back to normal mode.
To abort the calibration, turn off the
meter at any time.
The meter is calibrated at standard
400ppm CO concentration in factory.
2
It’s suggested to do manual calibration
regularly to maintain good accuracy.
Note:
When the accuracy becomes a concern
after a long time usage, return to dealers
for standard calibration.
Place the meter in the calibration site.
Turn on the meter and hold down
and simultaneously to enter CO
2
calibration mode (Fig.14). 400ppm and
"CAL" are blinking on the LCD while
performing calibration.

9
33% calibration
Plug the sensor probe into 33% salt
bottle. Hold down and under
normal mode to enter 33% calibration
(Fig.15). "CAL" and calibrating value
(32.7% if at are blinking on the
LCD with current temp. at the left.
25°C)
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 stable humidity(better
to be close to the calibrating value). To
abort calibration, just turn off the meter.
(7755/77535)
RH CALIBRATION
CAL
Esc DP/WB T
%%
OO
Fig. 15
%%
OO
Fig. 16
%%
OO
Fig.17
75% calibration
After 33% calibration, plug the sensor
probe into 75% salt bottle, then press
to enter 75% calibration (Fig.17).
N
X
M /AV
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.
Meter is now calibrating, and will finish
in about 60 minutes when and
humidity stop blinking. (Fig.16)
"CAL"

10
NOTE:
Users can also calibrate either point.
To calibrate 33% only, press and
exit when 33% calibration is completed.
To calibrate 75% only, press or
within the 5 minutes while initializing
33% calibration.
CAL
Esc
DP/WB T
"CAL" and calibrating value (75.2% if at
25°C) are blinking on the LCD with
current temp. at the left. Meter is now
calibrating. Wait about 60 minutes until
blinking stops, then calibration is
completed and it returns to normal mode.
? Error messages
E01: CO sensor damaged.
2
E02: The value is under range.
E03: The value is over range.
E04: The original data error results in
this error (DP, WB)
E07: Too low voltage to measure CO .
2
Replace batteries or use an adaptor.
E11: Retry humidity calibration.
E17: Retry CO calibration.
2
E31: Temperature sensor damaged.
E34: Humidity sensor damaged.
? Can’t power on
Press for more than 0.3 sec and try
again. Check whether batteries are in
good contact and correct polarity, or the
adaptor is well plugged.
TROUBLE SHOOTING
SET
? Fixed readings
Check whether data hold function was
activated. (HOLD icon at the left top)
? Slow response
Check whether the air flow channels on
the rear were blocked.

11
PC CONNECTION
The meter can do PC link for
data analysis
on-line
logging and via RS232
interface and software.
The protocol is as follows.
B.Format (ASCII)
Model 7752/77532
Cxxxxppm:Txxx.xC(F) LRC CRLF
Description: $CO2:Air LRC CRLF
Model 7755/77535
Cxxxxppm:Txxx.xC(F):Hxx.x%:
dxxx.xC(F):wxxx.xC(F) LRC CRLF
Description: $CO :Air:RH:DP:WBT LRC
2
CRLF
A.9600 bps, 8 data bits, no parity.
SPECIFICATION
7752 77532 7755 77535
Mod el
Measuring range
CO20~99 99 ppm 0~99 99 pp m 0~99 99ppm 0~99 99 pp m
(20 01~99 99
out of sca le) (20 01~99 99 out of sca le)
(50 01~99 99
out of sca le) (50 01~99 99 out of sca le)
Temp . -10~60°C( 14 ~1 40°F)
Humi dity 0.1%~ 99 .9%R H
NA
Dew point NA -20.0~ 59 .9°C
Wet bu lb NA -5.0~59 .9°C
Resolution 1p pm, 0. 1°C/°F 1p pm, 0. 1°C/°F, 0.1%R H
Accuracy
CO2±50 pp m±5% ±50ppm±5%
±30ppm±5% ±30 pp m±5%
(0~ 20 00pp m) (0~ 20 00pp m)
(0~ 50 00pp m) (0~ 50 00pp m)
Temp . ±0.6°C/±0. 9°F
Humi dity NA ±3%RH (at 25°C, 10 ~9 0%RH );
±5%RH (a t 25°C, ot hers)
War m-up time 30 seconds
Response time
CO2
Tair
<30 secon ds (90 % st ep cha nge)
<2 mins (90 % st ep cha nge)
RH NA <10 mins (90 % step ch ange )
Relay NO
LCD size 26*44 mm, H* W
Ope rating
cond ition 0~ 50°C, 0~95% RH (a voi d co nd ensation )
Stor age
cond ition -20 ~50°C, 0~ 95 % RH (a voi d condensat ion )
Power sup pl y AA *4 pcs
Batter y life >24 hou rs (A lkal ine ba ttery)
Met er si ze 205*70 *56 mm, L*W*H
Weight 200g
Stan dard
pack age Met er, manu al, AA bat teries, hard ca rry ca se

12
CO2 LEVELS AND GUIDELINES
EPA Taiwan: 600ppm and 1000ppm
Type 1 indoor areas such as department
stores, theaters, restaurants, libraries,
the acceptable CO2 concentration of 8
hours avarge is 1000ppm.
Type 2 indoor areas with special requirements
of good air quality such as schools,
hospitals, day care centers, the
suggested CO2 level is 600ppm.
NIOSH recommendations
250-350ppm: normal outdoor ambient
concentrations
600ppm: minimal air quality complaints
600-1000ppm: less clearly interpreted
1000ppm: indicates inadequate ventilation;
complaints such as headaches,
fatigue, and eye/throat irritation
will be more widespread. 1000
ppm should be used as an upper
limit for indoor levels.
Non-Enforced Reference levels
Regulatory exposure limit
ASHRAE Standard 62-1989: 1000ppm
CO2 concentration in occupied building should
not exceed 1000ppm.
Building bulletin 101 (BB101):
UK standards for schools say that CO2 at
1500ppm
averaged over the whole day(i.e. 9am to 3.30
pm) should not exceed 1500ppm.
OSHA: 5000ppm
Time weighted average over five 8-hour work
days should not exceed 5000ppm.
Germany, Japan, Australia, UK...: 5000ppm
8 hours weighted average in occupational
exposure limit is 5000ppm.

13
WARRANTY
The meter is warranted to be free from
defects in material and workmanship for
a period of one year from the date of
purchase. This warranty covers normal
operation and does not cover misuse,
abuse, alteration, neglect, improper
maintenance, or damage resulting from
leaking batteries. Proof of purchase is
required for warranty repairs. Warranty is
void if the meter has been opened.
RETURN AUTHORIZATION
OTHER RELATED PRODUCTS
Authorization must be obtained from
the supplier before returning items for
any reason. When requiring a RA
(Return Authorization), please include
data regarding the defective reason,
the meters are to be returned along
with good packing to prevent any
damage in delivery and insured against
possible damage or loss.
Other related CO products:
2
a.Model 7721 Wall mount Temp./CO
2
meter, general purpose.
b.Model 77231 Wall mount Temp./CO
2
meter, high performance.
c.Model 7722 Wall mount Temperature/RH/CO2
meter, general purpose.
d.Model 77232 Wall mount Temperature/RH/CO2
meter, high performance.

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2013/08 Ver.3
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