JMW Vent Check User manual

Operation
Pressbutton1toturnthemeter
onandoff.
After a30second warm-upthe
meterisreadytouseand will
displaythe normaloperating
screen(Fig.2).
Pressing button 4 will cycle through current air
temperature.
Pressing button 6 will cycle through minimum CO2,
maximum CO2, Time Weighted Average (TWA -
weightedaverageof CO2 inthepast8hours)andShort
TimeExposureLimit(STEL-weightedaverageofCO2 in
thepast15minutes) readingssincepoweron.
Pressing button 5 will hold all current readings except
TWAandSTEL.
Pressing and holding button 2 for morethan a second
will turn the backlight on and off.
The unit will turn off automatically after 20 minutes of
inactivity. Tooverride this function, turnthe unit off then
restart it byholding buttons 1 and 5 together.
The meter will take a newreading every second. When
the operating conditions change, the unit will respond
in30secondsforCO2.
VentCheck
DualdisplayofCO2 andtemperature
StableNDIRsensorforCO2detection
Statisticsofweightedaverages
BS8494compliant(from10-60ºC)
Backlightforworkingindarkareas
AudibleCO2 warningalarm
EasymanualfreshaircorrectiononCO2
and humidity
PCconnectionviaRS232interface
When battery supply is low, 'Lob' will be displayed.
Change the batteries or connect a DC adaptor (not
supplied.)
NOTE: Do not hold the meter close to the face as
exhalationcanaffectCO2 readings.
Display
A
B
NormalOperation(Fig.2)
A
B
MenuMode-TopLevel(Fig.3)
A
B
MenuMode-LowerLevel(Fig.4)
1
3
56
Keypad(Fig.1)
2
4
C
C
C
A =CO2 readinginppm
B =Temperature
C =N/A
A =Menuname
B =N/A
C =Menulevel(e.g.P1.0)
A =Currentvalue
B =Currentmenuname
C =Menulevel(e.g.P1.1)
A
B
C
A
B
C
A
B
C

Setup
Toenterthe setupmode(Fig.3)pressandholdbutton1
formorethanasecond.
From here use buttons 2 (UP) and 4 (DOWN) to cycle
through the menu screens and button 6 to accesss the
selectedmenuscreen(Fig.4).
Buttons2and4canthenbeusedtoalterthealarm
Toabort correction at any time, simplyturnthe meter off.
Specification
CO2
Rangeof0-9999ppm
(maximumalarmthreshold 9900ppm)
Resolutionof2ppm
Accuracy±75ppm±5%
Temperature
Rangeof-10 -60 ºC(14-140 ºF)
Resolutionof0.1ºC(0.1ºF)
Accuracy±0.6ºC
WarmUp
30seconds
OperatingRanges
From0~50ºC, 0~95%RH(avoidcondensation)
Storage
From-20~60ºC,0~99%RH(avoidcondensation)
Power
4pcsAAbatteries,DCAdaptor(notsupplied)
BatteryLife
>10hours(Alkaline)
threshold on menu P1.1 and the temperature scale on
menuP3.1(Fig.4).
Use button 6 to save the current setting and return to
themainmenuscreen(Fig.3).
Pressbutton3 at anytime to exit the setup menu.
Troubleshooting
Can'tpoweron
Press button 1 for more than 0.3 seconds and try
again. Check whether batteries are in good contact
andcorrectpolarityisobserved.
Fixedreadings
Check whetherdataholdfunctionwas activated.
Slowresponse
Check whether theair flow channels on the rear are
blocked.
Errormessages
E01:CO2sensordamaged
E02:Thevalueisunderrange
E03:Thevalueisoverrange
E04:Theoriginaldataerrorresultsinthiserror
E07: Voltageto measure CO2. Replace batteries or
useanadaptor
E17:RetryCO2calibration
E31:Temperaturesensordamaged
FreshAirCorrection&Calibration
CO2 FreshAirCorrection
It is stronglysuggested that the unit be corrected in a sunny, outdoor environment that is well ventilated. Do not correct
the unit in places crowded with people or close to areas with high CO2 concentration such as ventilating outlets or
fireplaces.
Tocorrecttheunitfor CO2, placethemeter inthecalibration site andpress andholdbuttons2 and 3simultaneously. The
unit will flash continually for about 5 minutes,then return to normaloperation.
CAUTION: Themeter is corrected at ambient air ofaround 400ppm. Do not correct the meter in an environment with an
unknown CO2 concentration. Doingthiscouldleadtoinaccurate measurements.