Carbon dioxide
Synonyms: Carbonic acid gas, Carbonic anhydride, Carbon (IV) oxide; Dry ice (in
solid state).
Chemical formula
CO
2
Molar weight
44
Relative gas density (to air)
1.52
Conversion
1 ppm = 1.80 mg/m
3
Boiling point
Sublimes
Flammability
Nonflammable
Odour
Odourless
Hazards
Dusts of various metals (Mg, Zr, Ti, Al,
Cr, Mn) are ignitable and explosive when
suspended in carbon dioxide.
In concentrations up to 1% (10 000
ppm), it will make some people feel
drowsy and give the lungs a stuffy
feeling. Concentrations of 7% to 10%
(70 000 to 100 000 ppm) may cause
suffocation, even in the presence of
sufficient
oxygen,
manifesting
as
dizziness, headache, visual and hearing
dysfunction, and unconsciousness within
a few minutes to an hour.
Exposure
limits
(Directive 2006/15/EC)
TWA
9000 mg/m
3
/5000 ppm
STEL
Not specified
Conversion of ppm to mg/m
3
is calculated for 25°C and 1 atm.
Indoor air quality in nonresidential buildings
CO2 level
Description
< 450 ppm
High quality (fresh air)
450-600 ppm
Medium quality
600-1000 ppm
Moderate quality
> 1000 ppm
Low quality
Installation guidelines
(See Installation and connections section for general information.)
Since CO
2
is heavier than air, it is recommended to locate the sensor not higher, than
the potential leakage. For air quality control place the sensor in the breathing zone.
Calibration
E2648 series devices have been calibrated by Manufacturer with standard gas
mixtures before delivery. Provided that the sensor is used under moderate
conditions, field recalibration is recommended every 5 years. Please contact your
dealer for more information.
Emergency mode
The current outputs of the E2648-CO2 may be programmed via Modbus
commands (register 255) to signal if the connection with the sensor is lost. The
signal may be set to 3.8 mA or 21.5 mA. See Annex 1 for more information.
E2648-CO2-50K_UM_EN
Rev 31.10.2019
Specifications
Sensor type
optical (NDIR)
Sampling method
diffusion
Detection range
0...50 000 ppm
Resolution / digital unit
100 ppm
Accuracy
± (70 ppm + 5% of reading)
Response time T90
up to 3 minutes
Sensor lifetime
ca 10 years
Calibration interval
up to 5 years
Signal update
every 1 second
Digital interface
RS485, Modbus RTU protocol
no galvanic isolation
Load resistance
R
L
< (Us - 2 V) / 22 mA for 4-20 mA
R
L
> 250 kOhm for 0-10 V mode
Power supply
11...30 VDC as standard,
options: 24 VAC or 90...265 VAC
Power consumption
< 2 VA
Analog outputs
2 × 4-20 mA / 0-10 V, user settable
Outputs assignment
OUT1 2 gas; OUT2 2 gas
Output scale width
not below 10 × resolution
recommended: 20-100% of the detection range
Cable connections
screwless spring loaded terminals
Enclosure
die-cast aluminium, wall mount, protection class IP66
Dimensions
H120 × W125 × D57 mm
Operating conditions
-25...+50 °C, 0...95% RH; pressure 0,9...1,1 atm;
non ATEXrated areas, non-aggressive atmosphere
CE marking
according to 2014/30/EU and EN61326-1 requirements
Relay option
Output relays
2 × SPST relays (closing contact),
250 VAC / 30 VDC, 5 A max
Default alarm set-points
according to user’s preferences
(within 5-95% of the detection range)
Other options
Ambient pressure
compensation
in the range 0,5...2 bar of absolute pressure
Remote probe
protection IP65, shielded cable, default length 3.0 m
Evikon MCI OÜ
Teaduspargi 7, Tartu
Tel. +372 733 6310 50411 Estonia
www.evikon.eu
PluraSens
®
Carbon Dioxide Detector-Transmitter
E2648-CO2-50K
User Manual
