Combustible gases
E2638-LEL detector-transmitter is sensitive to light hydrocarbon gases (acetylene,
methane, propane, butane) and hydrogen.
See Annex 2 for more detailed information concerning the properties of the
detected gases.
NOTE Transmitter with catalytic type sensor is not suitable for acetylene detection.
Installation guidelines
(See Installation and connections section for general information.)
For gases lighter than air install the sensor higher than potential leakage/generation
source or near the ceiling. Combustible gases lighter than air are hydrogen (0,07 of air
density), methane (0,55 of air density) and acetylene (0.90 of air density).
Propane and butane are heavier than air (1.55 and 2.0 of air density respectively) and
tend to sink. It is recommended to place the sensor lower than potential leakage or
generation source.
Calibration
E2638-LEL devices have been calibrated by Manufacturer with standard gas
mixtures before delivery. Provided that the sensor is used under moderate
conditions, the recommended recalibration interval for metal oxide sensor is 12
months. Catalytic sensors are more sensitive to the environment and require field
recalibration every 3...6 months. Please contact your dealer for more information.
E2638-LEL_UM_EN
Rev 25.05.2020
Specifications
Detected gases
acetylene, butane, hydrogen, methane, propane etc
Sampling method
diffusion
Sensor type
metal oxide semiconductor
catalytic (pellistor)
Typical detection range
0...100% LEL
0...100% LEL
Resolution / digital unit
0.1% LEL
1% LEL
Response time T90
ca. 60 s
8 s
Sensor lifetime
> 5 years
> 2 years
Calibration interval
12 months
3...6 months
Operating conditions
-30...+70 °C
-20 to +60°C
<95 % RH non-condensing, 0,9...1,1 atm
explosion safe areas; normal ambient oxygen level
avoid exposure to corrosive gases or silicon containing
products
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
Relay option
Output relays
2 × SPST relays (closing contact),
250 VAC / 30 VDC, 5 A max
Default alarm setpoints
RE1 (LOW): set 20% LEL; release 16% LEL
RE2 (HIGH): set 50% LEL; release 40% LEL
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
®
Combustible Gases
Detector-Transmitter
E2638-LEL
User Manual
