Evikon PluraSens E2658-NH3-E Bedienungsanleitung

PluraSens®

Ammonia Detector-Transmitter

E2658-NH3-E

User Manual

E2658-NH3-E Rev 29.06.2021
Table of contents
Ammonia 3
Speciﬁcations 4
Product description 6
Safety requirements 6
Operating conditions 7
Installation guidelines 7
Mounting dimensions 9
Sensor probe handling 10
Gas sensor replacement procedures 10
Electrical connections 11
Correct and incorrect cabling for 24 VAC 13
Operation 14
Maintenance 14
Calibration 14
Delivery set 15
Order code for E2658-NH3-E options 15
Conﬁguring 16
Return to default settings 16
Modbus RTU Communication 17
RS485 communication interface 17
Communication parameters 17
Modbus holding registers 17
Warranty 22
Manufacturer contacts 22
2

E2658-NH3-E Rev 29.06.2021

Ammonia

A colorless gas, highly soluble in water, with a characteristic pungent smell.

Ammonia is a large-scale production of the chemical industry widely used as a raw

material for the production of fertilizers and explosives, as a refrigerant, as a cleaning and

antimicrobial agent.

Ammonia is also produced naturally from the decomposition of organic matter, including

plants and animals.

Chemical formula

NH3

Molar weight

Relative gas density (to air)

0.59

Conversion

1 ppm = 0.70 mg/m3

Boiling point

-33.3 °C

Low explosive limit (LEL), % vol. in air

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

Odor

Characteristic pungent smell

Odor detection threshold

0.04 ppm ...57 ppm according to different studies

Hazards

Ammonia is irritant to the skin, eyes, and respiratory

tract. Ammonia inhalation causes breathing diﬃculties

(wheezing).High concentrations may lead to pulmonary

edema.

Exposure limits

(Directive 2000/39/EC)

TWA

14 mg/m3/ 20 ppm

STEL

36 mg/m3/ 50 ppm

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

E2658-NH3-E Rev 29.06.2021

Speciﬁcations

Sensor type

Electrochemical cell

Sampling method

Diffusion

Typical detection ranges

0...100 ppm

0...300 ppm

0...1000 ppm

Maximum overload

200 ppm

500 ppm

1500 ppm

Resolution / digital unit

1 ppm

Response time T90

< 75 s

Sensor lifetime

>2 years

Calibration interval

6 months

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 c IIC Gb II 2 D Ex tb IIIC Db IP66

Glands:

ATEX / IECEx II2G Ex e II IP68

IBExU08ATEX 1063 X Ex II 1D Ex tD A20 IP 6x Ex

E2658-NH3-E Rev 29.06.2021

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

-40...+50 °C,

15...90% RH non-condensing, 0,9...1,1 atm

Explosion-safe zones and ATEX Zones 2 and 22,

Non-aggressive atmosphere

NOTE! The sensor may exhibit considerable sensitivity to hydrogen

sulﬁde and sulfur dioxide

NOTE! The device is intended for the control of eventual leakages (e.g. in

refrigeration systems). Do not use the device in areas with constantly

high concentration of ammonia.

Relay option

Output relays

2 × SPST relays (closing contact),

250 VAC / 30 VDC, 5 A max

Default alarm setpoints

(set/release)

LOW: 25 / 20 ppm

HIGH: 35 /28 ppm

Determined by user within 5-95% of the

detection range

E2658-NH3-E Rev 29.06.2021

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 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.

E2658-NH3-E Rev 29.06.2021

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 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.),

●Ammonia is lighter than air, so the sensor should be placed higher than the

potential leakage or formation 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 detectors should be

distributed evenly in the room.

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.

E2658-NH3-E Rev 29.06.2021

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. Fix the detector 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!

E2658-NH3-E Rev 29.06.2021

Mounting dimensions

Front view

Bottom view

E2658-NH3-E Rev 29.06.2021

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,

2. Remove the PTFE ﬁlter (if it is not removed within the cap),

3. Remove the O-ring rubber,

4. Detach the electrochemical sensor from the device,

5. Insert the new electrochemical sensor inside,

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

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