Evikon PluraSens E2611-CH4 Manuale utente

PluraSens®

Methane Detector-Transmitter

E2611-CH4

User Manual

E2611-CH4 Rev 21.06.2021
Table of contents
Methane 3
Speciﬁcations 4
Product description 5
Safety requirements 5
Operating conditions 6
Installation guidelines 6
Installation and connections 7
Correct and incorrect cabling for 24 VAC 10
Operation 11
Maintenance 11
Calibration 11
Delivery set 11
Order code for E2611-CH4 options 12
Conﬁguring 12
Return to default settings 12
RS485 communication interface 13
Modbus registers (0-based, decimal format) 13
Factory settings 14
Warranty 15
Manufacturer contacts 15
2

E2611-CH4 Rev 21.06.2021

Methane

Colorless ﬂammable gas, widely used as a fuel.

Synonyms: Marsh Gas, Natural Gas, Carbon tetrahydride, Hydrogen carbide

Chemical formula

CH4

Molar weight

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

5.0

Upper explosive limit (UEL), % vol. in air

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

Conversion of ppm to mg/m3is calculated for 25°C and 1 atm.

E2611-CH4 Rev 21.06.2021

Speciﬁcations

Sampling method

Diffusion

Sensor type

Metal Oxide Semiconductor

Detection range

Up to 100% LEL

Resolution

0,1% LEL

Response time

~ 60 seconds

Sensor lifetime

>5 years

Calibration interval

12 months

Operating temperature

-40...+70 °C

Power supply

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

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

Cable connections

Screwless spring-loaded terminals

Relay outputs

2 × SPST, max 5 A, 30 VDC / 250 VAC

Default alarm set-points

LOW set 20, release 16% LEL

HIGH set 50, release 40%LEL

Alarm

Buzzer 85 dB

Enclosure

ABS plastic with ventilation slots, wall-mount, IP20

Dimensions

85 × 85 × 37 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

Operating conditions

(operating temperature is mentioned above.)

<95 %RH, without condensation, non-ATEX Normal ambient oxygen level

Avoid strong mechanical shock, vibrations or EMI, Avoid exposure to

corrosive gases or silicone-containing products.

E2611-CH4 Rev 21.06.2021

Product description

Methane detector-transmitter E2611-CH4 is intended for early detection of leakages or

accumulation of methane in indoor spaces. The instrument is based on a fully calibrated

and temperature compensated semiconductor metal-oxide (MOS) gas sensor with high

repeatability, stability and long lifetime. The sensor exhibits high sensitivity and selectivity

to methane.

E2611 series devices provide two independent analog outputs OUT1 and OUT2,

user-selectable to 4-20 mA or 0-10 V, proportional to the gas concentration. RS485 Modbus

RTU digital communication interface allows easy instrument conﬁguration and integration

into various automation systems. Two relays RE1 and RE2 with closing contacts can be

used to switch 24 V or 230 V powered alarm sirens, ventilation fans, shut-off valves, or

other actuators. The device is equipped with an acoustic alarm.

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 installation and connections section. The device

might not perform correctly or be damaged if the wrong power supply is connected.

External circuits connected to the equipment should have suﬃcient insulation rating

according to the environmental conditions and equipment power.

A disconnecting device that is marked as such and easily accessible should be included in

the installation of this product.

E2611-CH4 Rev 21.06.2021

Operating conditions

The device should be used in a non-hazardous (non-ATEX -rated) indoor area at the

atmospheric pressure ±10%, <95 %RH, without condensation, and in a basic

electromagnetic environment, where the latter is deﬁned in EN 61326-1. Metal-oxide

sensors cannot properly operate in a zero or low oxygen content atmosphere. Normal

ambient oxygen concentration is recommended. Avoid strong mechanical shock and

vibrations. Avoid corrosive atmosphere (H2S, SO2, HCl, Cl2, etc) and areas highly

contaminated with dust, oil mist, etc. Keep the instrument away from direct sunlight. A

sudden temperature or humidity change might affect the sensitivity of the sensor.

Installation guidelines

There are no precise rules or standards to follow when installing gas detectors. The

following points must be taken into account:

●Application (the instrument is intended for leakage control.)

●Properties of the space under investigation (room geometry, direction, and

velocity of airﬂows, etc.),

●Methane is lighter than air, so the gas detector-transmitter should be placed

higher than the potential leakage or formation source or on the ceiling.

●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 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 should be

distributed evenly in the room.

Do not locate the detector close to ventilation openings and strong air currents. Avoid the

areas without air circulation (corners, niches) as well.

For personal safety control, the detectors are installed in the breathing zone (at the height

of the head of people or animals). The recommended sensor position is vertical, pointing

downwards.

E2611-CH4 Rev 21.06.2021

Installation and connections

1. Detach the base of the enclosure by gently pulling along four guiding pins.

2. Attach the base to the wall with two screws (see drawings below).

3. Connect the power supply and external devices to the terminal blocks on the PCB

according to the connection diagram below.

Version without PSU Version with PSU

E2611-CH4 Rev 21.06.2021

Jumpers

OUT1 type (open: 4-20 mA; closed 0-10 V)

OUT2 type (open: 4-20 mA; closed 0-10 V)

Reset Modbus network parameters to default

X4 terminals

OUT1

4-20 mA / 0-10 V output

OUT2

4-20 mA / 0-10 V output

0 V / 24 VAC Neutral (optional)

RS485 A / Data +

RS485 B / Data -

+24 VDC / 24 VAC Phase (optional)

X5 terminals (optional)

90…265 VAC Phase

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

E2611-CH4 Rev 21.06.2021

To power the instrument from an external 24 V power source, connect terminals 0 V and

+U to the source. If an integrated mains power supply module is used, connect terminals L

and N to the mains.

NOTE! If the instrument is powered from mains, connect to 0 V and +U terminals only light

external loads, which consume less than 30 mA in total, as the integrated mains supply

module capacity is limited.

To use analog outputs, connect the terminals OUT1 and/or OUT2 and 0 V to the input of

the secondary instrument (indicator or controller).

NOTE! The outputs are not galvanically isolated from the 24 V power supply and share a

common 0 V. Allowed load resistance limits are stated in the Speciﬁcations table.

The type of each analog output can be independently changed between 4-20 mA and 0-10

V with jumpers J1 (OUT1) and J2 (OUT2). With a closed jumper, the output is 0-10 V, with

an open jumper the output is 4-20 mA. By default, both outputs OUT1 and OUT2 are

assigned to the gas concentration. The output assignments and scales can be changed by

Modbus commands.

To use relay outputs, connect the chosen actuators to the relay terminals RE1 and/or RE2.

NOTE! Actuator short-circuits shall be avoided. To protect the instrument relays use

external fuses or safety switches.

4. Turn on the power. It may take up to ﬁve minutes after switching on for the sensor to

stabilize. During this period relays, analog outputs, and Modbus interface are off. A LED

placed on the PCB of the device allows controlling the connection process. The LED

response to different processes is presented in the table below:

Mode

LED mode

During calibration mode or sensor heating

period (if activated)

0.5 Hz (50% on, 50% off)

Relay 1 turned on

Blinking 1 Hz (50% on, 50% off)

Relay 2 turned on

Blinking 2 Hz (50% on, 50% off)

During the Modbus communication cycle

Short on-off pulses

Normal operating/measurement

Continuously on or off

NOTE! Pulse corresponding to Modbus response is visible only when diode light is on.

5. Push the enclosure to the base.

E2611-CH4 Rev 21.06.2021

Correct and incorrect cabling for 24 VAC

Indice

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