Volatile Organic Compounds
Highly volatile organic liquids. The definitions of VOC may vary depending on
application field and country. E2638-VOC is intended to detect vapours of solvents
(acetone, benzene, ethanol, ethyl acetate, toluene, xylenes etc.
See Annex 2 for more information on the properties of various gases.
Installation guidelines
(See Installation and connections section for general information.)
Solvent vapours are heavier than air and tend to sink. Consider, if the vapours are
heated or not, if the detector is used for fire safety (LEL range) or air quality control
(0...100 to 0...1000 ppm range) etc.
Calibration
E2638-VOC detectors-transmitters have been calibrated by Manufacturer with
standard gas mixtures before delivery. Provided that the sensor is used under
moderate conditions, field recalibration is recommended once a year. Please
contact your dealer for more information.
E2638-VOC_UM_EN
Rev 25.05.2020
Specifications
Sampling method
diffusion
Sensor type
metal oxide semiconductor
Default calibration
toluene
Typical detection range
0...100% LEL
up to 0...1000 ppm
Resolution / digital unit
0.1% LEL
1 ppm
Response time T90
< 120 s
Sensor lifetime
> 5 years
Calibration interval
12 months
Signal update
every 1 second
Power supply options
11...30 VDC, 24 VAC
or 90...265 VAC (with mains power unit)
Power consumption
< 2 VA
Analog outputs
2 × 4-20 mA / 0-10 V, user settable
Outputs assignment
OUT1 2 gas; OUT2 2 gas
NOTE for LCD version only output 1 is available
Load resistance
R
L
< (Us - 2 V) / 22 mA for 4-20 mA
R
L
> 250 kOhm for 0-10 V mode
Digital interface
RS485, Modbus RTU protocol; no galvanic isolation
Enclosure
grey ABS, wall mount, protection class IP65
Dimensions
H90 × W145 × D55 mm
(overall dimensions H140 × W145 × D55 mm)
CE marking
according to 2014/30/EU and EN61326-1 requirements
Operating conditions
-30...+70 °C; <95% RH non-condensing, 0,9...1,1 atm
explosion safe areas; normal ambient oxygen level
avoid exposure to corrosive gases or silicone
containing products
Relay option
Output relays
2 × SPST relays (closing contact),
250 VAC / 30 VDC, 5 A max
Alarm setpoints
(set/release)
RE1 (LOW): 20/16 % LEL;
RE2 (HIGH): 50/40% LEL
RE1 (LOW): 100/80 ppm;
RE2 (HIGH): 300/240 ppm
(for 0...500 ppm range)
Signalling options
Visual
red and green LEDs
Acoustic alarm
buzzer 85 dB
LCD indicator option
Operating temperature
0...+50 °C
Display dimensions
72 × 36 mm
Number of digits
3.5 7-segment
Character height
14 mm
Other features
backlight
Other options
Remote probe
protection IP65, default cable length 3.0 m;
max height 80 mm, max diameter 65 mm
Evikon MCI OÜ
Teaduspargi 7/9, Tartu
Tel. +372 733 6310
50411 Estonia
www.evikon.eu
PluraSens
®
Solvent Vapours Detector-Transmitter
E2638-VOC
User Manual
