Evikon PluraSens E2618-LEL User manual

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PluraSens®
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Combustible Gas Transmitter
E2618-LEL
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User Manual
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E2618-LEL Rev 08.12.2020
Table of contents
Acetylene 4
Butane 5
Hydrogen 6
Methane 7
Propane 8
Specifications 9
Product description 11
Safety requirements 11
Operating conditions 11
Installation guidelines 12
Wall mount version 12
Duct mount version 12
Mounting dimensions 13
Sensor probe handling 14
Gas sensor replacement procedures 14
Operation 16
Maintenance 16
Calibration 16
Delivery set 17
Order code for E2618-LEL options 17
Configuring 18
Return to default settings 18
Modbus RTU Communication 19
RS485 communication interface 19
Communication parameters 19
Modbus holding registers 19
2

E2618-LEL Rev 08.12.2020
Warranty 23
Manufacturer contacts 23
 
3

E2618-LEL Rev 08.12.2020
Acetylene
A colorless flammable gas, lighter than air. Mixtures with air are explosive. It results from              
the interaction of calcium carbide with water. In industrial production, acetylene is mainly            
manufactured by the pyrolysis of light hydrocarbons.
Acetylene is widely used for welding and cutting of metals. The usage of acetylene as a               
feedstock in the chemical industry declines due to cost and environmental considerations.
Synonyms/Trade Names: Ethine, Ethyne.
 
4
Chemical formula
HC≡CH
Molar weight
26
Relative gas density (to air)
0.90
Conversion
1 ppm = 1.06 mg/m3
Boiling point
-84 °C
Low explosive limit (LEL), % vol. in air
2.3* (2.5**)
Upper explosive limit (UEL), % vol. in air
100
Odor
Odorless or with a faint ethereal smell if pure. The
commercial-grade may have a garlic-like smell due to
impurities.
Hazards
Highly flammable.
Gas/air mixtures are explosive. Forms explosive
acetylide compounds with copper, mercury, silver &
brasses (containing more than 66% copper).
Asphyxiant. Non-toxic, but, when generated from calcium
carbide, it can contain toxic impurities such as traces of
phosphine and arsine.
Exposure limits 
(NIOSH)
REL C
2662 mg/m3 /2500 ppm

E2618-LEL Rev 08.12.2020
Butane
A colorless flammable gas that is heavier than air. The term “butane” is used for any of two                 
structural isomers (n-butane or iso-butane, with unbranched and branched-chain        
respectively) or for their mixture. Occurs in light petroleum fractions.
Butane is used mainly as a fuel and as a feedstock in organic synthesis. It is applied also                 
as a propellant in aerosol sprays and may be used as an ozone-friendly refrigerant.
Mixtures of butane with propane and other hydrocarbons are referred to as LPG (liquefied             
petroleum gas).

 
5
Chemical formula
n-butane
CH3CH2CH2CH3
iso-butane
CH3CH(CH3)CH3
Molar weight
58
Relative gas density (to air)
2.0
Conversion
1 ppm = 2.38 mg/m3
Boiling point
-0.56 °C
−11.7 °C
Low explosive limit (LEL), % vol. in air
1.4* (1.6**)
1.5* (1.8**)
Upper explosive limit (UEL), % vol. in air
8.4
9.6
Odor
Gasoline-like odor
Hazards
Highly flammable.
Inhalation of butane can cause euphoria, drowsiness,
narcosis, asphyxia, cardiac arrhythmia, fluctuations in
blood pressure, and temporary memory loss, when
abused directly from a highly pressurized container, and
can result in death from asphyxiation and ventricular
fibrillation.
Exposure limits 
(NIOSH)
TWA
1900 mg/m3 /800 ppm
Not established

E2618-LEL Rev 08.12.2020
Hydrogen
A colorless, odorless, flammable gas, that is much lighter than air. Mixtures with air are              
explosive. Results from the interaction of acids, bases, and water with active metals and             
from the electrolysis of aqueous solutions. In industrial production, the main source of            
hydrogen is hydrocarbons.
 
6
Chemical formula
H2
Molar weight
2
Relative gas density (to air)
0.07
Conversion
1 ppm = 0.0818 mg/m3
Boiling point
−252.88 °C
Low explosive limit (LEL), % vol. in air
4.0
Upper explosive limit (UEL), % vol. in air
75
Odor
Odorless
Hazards
Flammable forms explosive mixtures with air.
Asphyxiant.
Exposure limits
not established

E2618-LEL Rev 08.12.2020
Methane
A colorless flammable gas, the main component of natural gas, marsh gases. Methane            
results from bacterial decomposition of plant and animal matter (landfill gas).
Methane is widely used as a fuel and chemical feedstock.
Synonyms: Marsh Gas, Natural Gas, Carbon tetrahydride, Hydrogen carbide.
 
7
Chemical formula
CH4
Molar weight
16
Relative gas density (to air)
0.55
Conversion
1 ppm = 0.65 mg/m3
Boiling point
−161.49 °C
Low explosive limit (LEL), % vol. in air
4.4* (5.0**)
Upper explosive limit (UEL), % vol. in air
15
Odor
Odorless when pure. Methane used in the kitchens
contains an odorant
Hazards
Highly flammable, mixtures with air are explosive.
Asphyxiant.
Exposure limits
not established

E2618-LEL Rev 08.12.2020
Propane
A colorless flammable gas that is heavier than air. it occurs in light petroleum fractions.
Propane is used mainly as a fuel and as a feedstock in organic synthesis. It is applied also                 
as a propellant in aerosol sprays and may be used as an ozone-friendly refrigerant.
Mixtures of propane with butane and other hydrocarbons are referred to as LPG (liquefied             
petroleum gas).

Conversion of ppm to mg/m3 is calculated for 25°C and 1 atm.
* according to new EU standards ('stirred' concentration of gas)
** according to US standard (‘still gas’ method)
 
8
Chemical formula
CH8CH2CH8
Molar weight
44
Relative gas density (to air)
1.55
Conversion
1 ppm =1.80 mg/m3
Boiling point
−42 °C
Low explosive limit (LEL), % vol. in air
1.7* (2.1**)
Upper explosive limit (UEL), % vol. in air
9.5
Odor
Odorless when pure. Commercially available propane for
fuel purposes may contain odorant (“gas smell”).
Hazards
Highly flammable, mixtures with air are explosive.
Asphyxiant. May cause dizziness, confusion, excitation
when inhaled.
Exposure limits 
(NIOSH)
TWA
1800 mg/m3 /1000 ppm
IDLH
2100 ppm [10%LEL]

E2618-LEL Rev 08.12.2020
Specifications
9
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 indoor areas,
Normal ambient oxygen level
Avoid strong mechanical shock, vibrations, or EMI
Avoid exposure to corrosive gases or silicone-containing products
NOTE! Transmitter with a catalytic type sensor is not suitable for acetylene
detection
Signal update
Every 1 second
Power supply options
11...30 VDC or 24 VAC
Power consumption
< 2 VA
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
Analog outputs
2 × 4-20 mA / 0-10 V, user settable
Outputs assignment
OUT1 2 gas; OUT2 2 gas
Output scale width
> 10 × resolution
Recommended: 20-100% of the detection range
Cable connections
Screwless spring-loaded terminals
Enclosure
Grey ABS, wall mount, protection class IP65
Dimensions
H82 × W80 × D55 mm
CE marking
According to 2014/30/EU and 2014/35/EU, EN 50491-4-1:2012
EN 61000-6-3:2020, EN 61326-1:2013(EMC, emissions)
EN 61000-6-1:2019, EN 61000-6-2:2019(EMC, Immunity)
EN 60079-29-1:2016, EN 60079-29-2:2015 and EN 60079-29-3:2014

E2618-LEL Rev 08.12.2020
10
Other options
Remote probe
Protection IP65, default cable length 3.0 m;
max height 80 mm, max diameter 65 mm