Evikon PluraSens E2658-LEL User manual

PluraSens®
Combustible Gas Detector-Transmitter
E2658-LEL
User Manual

E2658-LEL Rev 11.03.2022
Table of contents
Acetylene 4
Butane 5
Hexane 6
Hydrogen 7
Methane 8
Octane 9
Propane 10
Specifications 11
Product description 13
Safety requirements 13
Operating conditions 14
Installation guidelines 14
Mounting dimensions 16
Sensor probe handling 17
Gas sensor replacement procedures 17
Electrical connections 18
Correct and incorrect cabling for 24 VAC 20
Operation 21
Maintenance 21
Calibration 21
Delivery set 21
Order code for E2658-LEL options 22
Configuring 23
Return to default settings 23
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Modbus RTU Communication 24
RS485 communication interface 24
Communication parameters 24
Modbus holding registers 24
Warranty 28
Manufacturer contacts 29
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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.
Chemical formula
HC≡CH
Molar weight
26
Relative gas density (to air)
0.90
Conversion
1 ppm = 1.06 mg/m3
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/m3/2500 ppm
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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).
Chemical formula
n-butane
CH3CH2CH2CH3
iso-butane
CH3CH(CH3)CH3
Molar weight
58
Relative gas density (to air)
2.0
Conversion
1 ppm = 2.38 mg/m3
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/m3/800 ppm
Not established
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Hexane
A colorless flammable gas that is heavier than air. Hexane is a constituent component of
gasoline. It is widely used in solvents as it is cheap, relatively safe and largely unreactive. It
is also used as an industrial cleaner and degreaser and is an ingredient in many consumer
products.
Chemical formula
C6H14
Molar weight
86.18
Relative gas density (to air)
2.97
Conversion
1 ppm = 3.52 mg/m3
Boiling point
68.7 °C
Low explosive limit (LEL), % vol. in air
1.0* (1.2**)
Upper explosive limit (UEL), % vol. in air
7.5
Odor
Petroleum-like odor
Hazards
Highly flammable.
Inhalation of hexane can cause irritation of respiratory
tract, cough, mild depression, cardiac arrhythmias.
Exposure limits
TWA
1800 mg/m3/500 ppm
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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.
Chemical formula
H2
Molar weight
2
Relative gas density (to air)
0.07
Conversion
1 ppm = 0.0818 mg/m3
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
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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.
Chemical formula
CH4
Molar weight
16
Relative gas density (to air)
0.55
Conversion
1 ppm = 0.65 mg/m3
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
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Octane
A colorless flammable gas that is heavier than air. Octane is a component of gasoline
(petrol).
Chemical formula
C8H18
Molar weight
114.23
Relative gas density (to air)
3.86
Conversion
1 ppm = 4.67 mg/m3
Boiling point
125.6 °C
Low explosive limit (LEL), % vol. in air
1.0
Upper explosive limit (UEL), % vol. in air
6.5
Odor
Gasoline-like odor
Hazards
Highly flammable.
Inhalation of octane may cause irritation of respiratory
tract, depression, and pulmonary edema.
Exposure limits
(NIOSH)
TWA
350 mg/m3/75 ppm
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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).
Chemical formula
CH8CH2CH8
Molar weight
44
Relative gas density (to air)
1.55
Conversion
1 ppm =1.80 mg/m3
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/m3/1000 ppm
IDLH
2100 ppm [10%LEL]
Conversion of ppm to mg/m3is calculated for 25°C and 1 atm.
* according to new EU standards ('stirred' concentration of gas)
** according to US standard (‘still gas’ method)
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Specifications
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
≤10 s
Sensor lifetime
> 5 years
> 5 years
Calibration interval
12 months
6 months
In dusty or harsh environments more frequent calibration may be
required
Operating temperature
-40...+70 °C
-40 to +70°C
Signal update
Every 1 second
Power supply options
11...30 VDC (default),
24 VAC or 90...265 VAC as options
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
> 10 × resolution
Recommended: 20-100% of the detection range
Load resistance
RL< (Us - 2 V) / 22 mA for 4-20 mA
RL> 250 kOhm for 0-10 V mode
Digital interface
RS485, Modbus RTU protocol;
No galvanic isolation
Cable connections
Screwless spring-loaded terminals
Enclosure
Grey die-cast aluminium, wall mount, IP66
Cable gland
M25 for SWA cable or steel conduit Ø10...17 mm
Dimensions
H80 × W125 × D57 / H80 × W175 × D80 mm
Protection
Flameproof, ATEX: II 2 GD, Ex d IIC T4 Gb
ATEX Approvals
Enclosure:
ATEX / IECEx DEMKO 13 ATEX 1327771U
II 2 G Ex e IIC Gb II 2 D Ex tb IIIC Db IP66
Glands:
ATEX / IECEx EESF 19 ATEX 023X
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II 2G Ex db IIC Gb II 2D Ex tb IIIC Db IP66
CE marking
According to 2014/30/EU and 2014/34/EU,
EN 61000-6-3:2020, EN 61326-1:2013 (EMC, Emissions)
EN 61000-6-1:2019, EN 61000-6-2:2019, EN 61326-2-1:2013 (EMC,
Immunity)
EN 60079-0:2018, EN 60079-1:2014, EN 60079-31:2014,
EN 60079-29-1:2016, EN 60079-29-2:2015, EN 60079-29-3:2014
Operating conditions
(operating temperature is mentioned above)
<95%RH, RH non-condensing, 0,9...1,1 atm
Explosion-safe zones and ATEX Zones 2 and 22
Normal ambient oxygen level
Avoid strong mechanical shock, vibrations or EMI
Avoid exposure to corrosive gases, carbon disulfide or silicon containing
volatile products
Relay option
Relay outputs
2 × SPST, max 5 A, 30 VDC / 250 VAC
Default alarm setpoints
RE1 (LOW): set 20% LEL; release 16% LEL
RE2 (HIGH): set 50% LEL; release 40% LEL
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Product description
E2658 is a series of flameproof gas detectors-transmitters intended for operation in safe
zones and ATEX Zones 2 and 22. E2658 series devices are based on the PluraSens®
multifunctional platform and provide all its features. The instruments utilize gas sensors of
various types with excellent repeatability, stability, and long lifetime.
The E2658 series provides two independent analog outputs OUT1 and OUT2,
user-selectable to 4-20 mA or 0-10 V, proportional to gas concentrations. RS485 Modbus
RTU digital communication interface allows easy instrument configuration and integration
into various automation systems.
The following features are available as an option:
●Two relays RE1 and RE2 with closing contacts. Relay outputs can be used to
switch alarm sirens, ventilation fans, shut-off valves, or other actuators,
●24 VAC or 230 VAC as options for power supply.
The version of your detector-transmitter is marked on the package. If the symbol ⚠ is
marked on the equipment, consult the documentation for further information.
Safety requirements
Misuse will impair the protection of the product. Always adhere to the safety provisions
applicable in the country of use.
Do not perform any maintenance operation with the power on. Do not let water or foreign
objects inside the device.
Removal of the PCB from the enclosure voids the warranty. Do not touch the electronic
components directly, as they are sensitive to static electricity.
Connection diagrams can be found in the electrical connections section. The device might
not perform correctly or be damaged if the wrong power supply is connected.
It is crucial to tighten properly all the thread connections (screws, cable glands). Use ATEX
certified armored cables or cable conduits that are rated for use in the desired
environment.
A disconnecting device that is marked as such and easily accessible should be included in
the installation of this product.
The device should be properly earthed.
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Operating conditions
The device should be used in a basic electromagnetic environment, where the latter is
defined in EN 61326-1. Avoid strong mechanical shock and vibrations. Although E2658
series devices are suitable for use in the presence of flammable dust, special precautions
should be taken when operating in a dusty environment. Dust may block the porous filter of
the sensor and compromise the results of the measurement. The detector-transmitter
should be inspected regularly if used in a dusty atmosphere. Keep the instrument away
from direct sunlight. A sudden temperature or humidity change might affect the sensitivity
of the sensor. Make sure that installation and maintenance are performed in an explosion
safe atmosphere.
Installation guidelines
Before proceeding with the installation it is mandatory to read the Safety requirements
section and make sure to comply with all listed instructions. Installation standards EN
60079-29-2 and EN 45544-4 are also recommended for further instructions and related
information about the installation. During the installation of the detector-transmitter the
following points must be considered:
●Application (air quality control or leakage detection.)
●Properties of the space under investigation (room geometry, direction, and
velocity of airflows, etc.),
●For gases lighter than air, install the sensor higher than the potential
leakage/generation source or near the ceiling. Combustible gases lighter than air
are hydrogen, methane, and acetylene. Propane, hexane, octane and butane are
heavier than air and tend to sink. It is recommended to place the sensor lower
than potential leakage or generation source.
●The device should be accessible for maintenance and repair.
The aforementioned conditions above will affect the coverage area of the device. However,
the coverage area for a detector-transmitter is usually between 2.5 to 5 meters radius.
For early leakage detection, install the sensor as close as possible to the potential leakage
sources (flanges, valves, pressure reducers, pumps, etc.), taking into consideration other
points listed above.
For general area monitoring without definite leakage sources, the detector-transmitters
should be distributed evenly in the room.
For personal safety control, the detector-transmitters are installed in the breathing zone (at
the height of the head of people or animals). The recommended sensor position is vertical,
pointing downwards.
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The device is fixed on the wall using two fixing holes located outside the sealed area of the
device (see dimensional drawing). Unscrew four lid screws and detach the lid from the
detector-transmitter. Fix the detector-transmitter on the wall and earth the enclosure using
an earthing terminal on the side of the device.
NOTE! Never perform installation or maintenance in an explosive atmosphere!
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Mounting dimensions
Front view
Bottom view
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Sensor probe handling
The sensor probes of all types are equipped with a hydrophobic microporous PTFE filter to
protect the sensor from dust, dirt, and water drops. The filter should be replaced if it gets
strongly contaminated. To replace the PTFE filter, unscrew the sensor head cap and
remove the old filter. Place a new filter into the cap and tighten it again.
NOTE! Never stab or press the filter near its center where the sensor is located since this
may damage the sensor. Do not remove the filter as it may cause the device to show
incorrect values and/or break the sensor.
The recommended orientation of the sensor probe is vertical with the sensor tip pointing
downwards. This prevents the possible accumulation of condensed water on the sensor
protection filter.
Gas sensor replacement procedures
1. Remove the sensor head cap from the device (or the remote probe),
2. Remove the PTFE filter (if it is not removed within the cap),
3. Remove the O-ring rubber,
4. Detach the pellistor (catalytic) sensor from the device,
5. Insert the new pellistor (catalytic) sensor inside,
6. Put back the O-ring rubber, PTFE filter, and the head cap, respectively.
NOTE! Metal oxide semiconductor sensors are not replaceable!
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Electrical connections
Unscrew four lid screws and detach the lid from the device. Use the M25 cable gland to let
in the cables of the power supply and of the external devices. Without turning on the power,
plug the power cable, and connect the analog/relay outputs and/or digital interface
terminals to the necessary devices according to the relevant connection diagram.
Version with PSU and relays Version with PSU and without relays
Version without PSU and with relays Version without PSU and relays
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Jumpers
J1
OUT1 type (open: 4-20 mA; closed 0-10 V)
J2
OUT2 type (open: 4-20 mA; closed 0-10 V)
X6
Reset Modbus network parameters to default
X4 terminals
OUT1
4-20 mA / 0-10 V output
OUT2
4-20 mA / 0-10 V output
0V
0 V / 24 VAC Neutral (optional)
A
RS485 A / Data +
B
RS485 B / Data -
+U
+24 VDC / 24 VAC Phase (optional)
X5 terminals (optional)
L
90…265 VAC Phase
N
90…265 VAC Neutral
RE1 NO
Relay 1, normally open terminal
RE1 COM
Relay 1, common terminal
RE2 NO
Relay 2, normally open terminal
RE2 COM
Relay 2, common terminal
The screwless quick connect spring terminals on the E2658 series devices are suitable for
a wide range of wires with cross-section 0,5...1,5 mm2. We recommend striping the wire
end by 8...9 mm and using the wire end sleeves.
To connect the wire, insert the wire end into the terminal hole. To disconnect, push the
spring-loaded terminal lever, pull the wire out, and release the lever.
Use a twisted-pair cable, e.g. LiYY TP 2×2×0.5 mm2or CAT 5, to connect the device to the
RS485 network. A and B on the device represent DATA+ and DATA- respectively, polarity
must be respected when connecting to an external RS485 network.
Both analog outputs can be independently changed between 4-20 mA and 0-10 V type
using jumpers J1 (OUT1) and J2 (OUT2). By closing pins on a specific jumper the related
output is 0-10 V, with an open jumper the output is 4-20 mA. Power restart is required after
changing the position of the jumpers.
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NOTE! The outputs are not galvanically isolated from the external power supply and share
a common 0V. Allowed load resistance limits are stated in the Specifications table. To
power the instrument from an external power source, connect terminals 0V and +U to the
source. If the integrated mains power supply module is used, connect terminals L and N to
the mains.
NOTE! Actuator short-circuits should be avoided, to protect the instrument relays using
external fuses or safety switches.
Correct and incorrect cabling for 24 VAC
20