Evikon PluraSens E2618-N2O Manuale utente

PluraSens®

Nitrous Oxide Transmitter

E2618-N2O

User Manual

E2618-N2O Rev 08.05.2023

Table of contents

Nitrous Oxide 3

Speciﬁcations 4

Product description 5

Safety requirements 5

Operating conditions 5

Installation guidelines 6

Wall mount version 6

Duct mount version 6

Mounting dimensions 7

Sensor probe handling 8

Gas sensor replacement procedures 8

Electrical connections 9

Correct and incorrect cabling for 24 VAC 10

Operation 11

Maintenance 11

Calibration 11

Delivery set 12

Order code for E2618-N2O options 12

Conﬁguring 13

Return to default settings 13

Modbus RTU Communication 14

RS485 communication interface 14

Communication parameters 14

Modbus holding registers 14

Warranty 18

Manufacturer contacts 18

E2618-N2O Rev 08.05.2023

Nitrous Oxide

Nitrous oxide is a colorless non-ﬂammable gas, with a slight metallic scent and taste. It is

also known as laughing gas or nitrous.

Chemical formula

N2O

Molar weight

Relative gas density (to air)

1.53

Conversion

1 ppm= 1.8 mg/m3

Boiling point

-88.48 °C

Odor

Slightly sweetish

Hazards

Will support combustion, and may increase the intensity

of the ﬁre. Containers may explode when heated.

Inhalation causes intense analgesia; concentrations of

over 40-60% cause loss of consciousness preceded by

hysteria. Contact of liquid with eyes or skin causes

frostbite burn.

Exposure

limits (ACGIH)

TWA

25 ppm

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

E2618-N2O Rev 08.05.2023

Speciﬁcations

Sensor type

Optical (NDIR)

Sampling method

Diffusion

Typical detection range

0...1000 ppm

Max. overload

2000 ppm

Resolution

1 ppm

Response time T90

< 30s

Sensor lifetime

> 5 years

Calibration interval

12 months

Signal update

Every 1 second

Power supply

12...36 VDC (default)

24 VAC as option

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 2 gas; OUT2 2 gas

Output scale width

> 10 × resolution

Recommended: 20-100% of the detection range

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

Operating conditions

-20 °C to +50 °C

0 to 95% RH non-condensing;

0,9...1,1 atm; explosion-safe areas

Non-aggressive atmosphere

NOTE: The sensor has cross-sensitivity to CO2, ask from manufacturer

details

Other options

E2618-N2O Rev 08.05.2023

Remote probe

Protection IP65, default cable length 3.0 m;

max-height 80 mm, max diameter 65 mm

E2618-N2O Rev 08.05.2023

Product description

E2618 series 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.

E2618 series provide two independent analog outputs OUT1 and OUT2, user-selectable to

4-20 mA or 0-10 V, proportional to the chosen scale for gas concentration. RS485 Modbus

RTU digital communication interface allows easy instrument conﬁguration and integration

into various automation systems. 24 VAC is available as options.

Remote probe and duct mount versions are available.

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

⚠

symbol is marked on

the product, 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.

E2618-N2O 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 transmitter the following

points must be considered:

●Application (air quality and leakage control.)

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

velocity of airﬂows, etc.),

●Nitrous oxide is heavier than air. The recommended location is close to or below

the potential leakage 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 transmitter should be

distributed evenly in the room.

For personal safety control, the 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

Unscrew four lid screws and detach the lid from the transmitter. Attach the device to a wall

with screws passing through mounting 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 transmitter.

E2618-N2O Rev 08.05.2023

Mounting dimensions

Wall mount version

Duct mount version

E2618-N2O Rev 08.05.2023

Sensor probe handling

The wall mount version of the 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 NDIR sensor from the device,

5. Insert the new NDIR sensor inside,

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

E2618-N2O 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.

PCB without PSU and relays

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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