Evikon E2608-CH4 Manuel utilisateur

PluraSens®

Methane Detector-Transmitter

E2608-CH4

User Manual

E2608-CH4 Rev 08.05.2023

Table of contents

Methane 3

Speciﬁcations 4

Product description 6

Safety requirements 6

Operating conditions 6

Installation guidelines 7

Wall mount version 7

Duct mount version 7

Mounting dimensions 8

Sensor probe handling 9

Gas sensor replacement procedures 9

Electrical connections 10

Correct and incorrect cabling for 24 VAC 12

Operation 13

Maintenance 13

Calibration 13

Delivery set 14

Order code for E2608-CH4 options 14

Conﬁguring 15

Return to default settings 15

Modbus RTU Communication 16

RS485 communication interface 16

Communication parameters 16

Modbus holding registers 16

Warranty 21

Manufacturer contacts 21

E2608-CH4 Rev 08.05.2023

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.

E2608-CH4 Rev 08.05.2023

Speciﬁcations

Sampling method

Diffusion

Sensor type

Metal oxide semiconductor

Catalytic (pellistor)

Typical detection range

0...100% LEL

Resolution / digital unit

0.1% LEL

1% LEL

Response time T90

ca. 60 s

≤10s

Sensor lifetime

> 5 years

> 3 years

Calibration interval

12 months

6 months

Operating conditions

-40...+70 °C

-10...+50°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

Signal update

Every 1 second

Power supply

12...36 VDC,

24 VAC or 230 VAC as options

Power consumption

< 2 VA

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

Analog outputs

2 × 4-20 mA / 0-10 V, user settable

Outputs assignment

OUT1: Gas; OUT2: Gas

Output scale width

> 10 × resolution

Recommended: 20-100% of the detection range

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

Cable connections

Screwless spring-loaded terminals

Enclosure

Grey ABS, wall mount, protection class IP65

Dimensions

H87 × W82 × D55 mm

CE marking

According to 2014/30/EU and 2014/35/EU, EN 50491-4-1:2012

E2608-CH4 Rev 08.05.2023

EN61000-6-3:2020, 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

Other options

Remote probe

Protection IP65, default cable length 3.0 m;

max height 80 mm, max diameter 65 mm

E2608-CH4 Rev 08.05.2023

Product description

E2608 series detectors-transmitters belong to the PluraSens® family of multifunctional

measurement instruments. The instruments utilize gas sensors of various types with

excellent repeatability, stability, and long lifetime.

E2608 series provides two independent analog outputs OUT1 and OUT2, user-selectable to

4-20 mA or 0-10 V. RS485 Modbus RTU digital communication interface allows easy

instrument conﬁguration and integration into various automation systems.

Two relays RE1 and RE2 with closing dry contacts can be used to switch alarm sirens,

ventilation fans, shut-off valves, or other actuators. Remote probe, duct mount version, and

24 VAC or 230 VAC power supply options are available.

The version of your detector-transmitter is marked on the package. If the symbol

⚠

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.

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.

Operating conditions

The device should be used both in a non-hazardous area and in a basic electromagnetic

environment, where the latter is deﬁned in EN 61326-1. Avoid strong mechanical shock and

vibrations. Avoid corrosive atmosphere 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.

E2608-CH4 Rev 08.05.2023

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.),

●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-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.

Wall mount version

Attach the mounting lugs to the back of the detector-transmitter using the provided

screws. Screw the device to the wall through the mounting lug holes (for dimensions see

the drawing in the next section).

Duct mount version

Cut a hole with a diameter of 36...45 mm in the air duct at the chosen mounting place.

Place the rubber ﬂange aligning the holes in the ﬂange and the air-duct and ﬁx the ﬂange

with four self-tapping screws. Pass the sensor probe through the ﬂange and adjust it to the

appropriate depth. Unscrew four lid screws and detach the lid from the

detector-transmitter.

E2608-CH4 Rev 08.05.2023

Mounting dimensions

Wall mount version with mounting lugs

Duct mount version

E2608-CH4 Rev 08.05.2023

Sensor probe handling

The wall-mount version of the detector-transmitter is available with a remote probe (see

drawing below for dimensions). The remote probe is connected to the main unit with a

shielded cable. The default remote probe cable length is 3 m.

A) Wall mount remote probe with ﬁxing clamp (default version),

B) Remote probe with rubber ﬂange and three self-tapping screws (on request)

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 catalytic (pellistor) sensor from the device,

5. Insert the new catalytic (pellistor) sensor inside,

6. Put back the O-ring rubber, PTFE ﬁlter, and the head cap, respectively.

Note! Metal oxide semiconductor sensors are not replaceable.

E2608-CH4 Rev 08.05.2023

Electrical connections

Unscrew four lid screws and detach the lid from the device. Use the M16 cable gland to let

in cables of the power supply and of the external devices. Attach the power cable to the

device without turning it on. Using the connection diagram below, connect the analog

outputs and digital interface terminals to the relevant devices according to your tasks.

Version without PSU Version with PSU

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)

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