Evikon E2658-NH3-P Ammonia Detector Transmitter User Manual

: June 3, 2024
: Evikon

Evikon E2658-NH3-P Ammonia Detector Transmitter

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	17
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	15
Upper explosive limit (UEL), % vol. in air	28
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

Speciﬁcations

Sensor type	Pellistor (catalytic bead)
Sampling method	Diffusion
Typical detection ranges	0…15%vol. (0…100%LEL NH33)
Resolution / digital unit	0.1%vol. or 1%LEL
Response time T90	< 10 s
Sensor lifetime	>3 years
Calibration interval	6 months
Signal update	Every 1 second
Power supply options	12…36 VDC (default), 24 VAC or 230 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 19ATEX 023X 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

| -20…+60 °C,

<95%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

Output relays

| 2 × SPST relays (closing contact), 250 VAC / 30 VDC, 5 A max

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 equipment, consult the documentation for further information. is marked on the

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.

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.

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!

Mounting dimensions

Front view

Bottom view

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

Remove the sensor head cap from the device,
Remove the PTFE ﬁlter (if it is not removed within the cap),
Remove the O-ring rubber,
Detach the pellistor (catalytic) sensor from the device,
Insert the new pellistor (catalytic) sensor inside,
Put back the O-ring rubber, PTFE ﬁlter, and the head cap, respectively.

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.

Jumpers

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 mm2 or 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.

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

Operation

Turn on the power. The instrument warm-up time takes about 1 minute after switching on and the ﬁnal sensor stabilization time to maximum accuracy takes about 30 minutes. The operating status is indicated by the LED on the PCB of the device. The control LED (red) response to different processes is presented in the following table:

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

Make sure that the detector-transmitter is properly mounted, the external devices connected, the power LED (green) on, and the control LED (red) is constantly lit. Place the lid back and ﬁx it with the screws. Make certain that the cable gland and the screws ﬁxing the front lid are properly tightened to ensure the conformity to IP66 protection class and ATEX requirements. Make certain that the device is properly earthed. The device is ready to use.

Maintenance

Do not perform any maintenance operation with the power on.
Clean the device with a soft damp cloth. Do not use any abrasive cleaning agents. Do not immerse the device in water or any cleaning media.

Calibration
E2658-NH3-P detector-transmitters have been calibrated by the Manufacturer with standard gas mixtures before delivery. Provided that the sensor is used under moderate conditions, ﬁeld recalibration is recommended every 6 months. Please contact your dealer for more information.

Delivery set

Detector-transmitter E2658
Mounting accessories:
- 2 screws with plastic dowels

Order code for E2658-NH3-E options

E2658 options	Order code
Integrated 90…265 V mains power supply module	E2658-NH3-P-230
Integrated 24 VAC power supply module	E2658-NH3-P-24VAC
Two SPST relays	E2658-NH3-P-R

Conﬁguring

A standard conﬁguration kit includes a USB-RS485 converter, ﬁxed ﬂow regulator, gas tubing with applicators, and a software pack. Please contact your Seller for more information. Detectors- transmitters E2658 share all functionalities of the PluraSens® multifunctional platform. The features and options include:

Digital output change rate-limiting ﬁlter
Digital integrating (averaging) ﬁlter
Free assignment of each analog output to the chosen parameter
Flexible setting of analog output scales for each output
Output zero and slope adjustment for calibration
Free assignment of each of two relays to the chosen parameter
Several relay control logic modes
Switch delays and minimum on/off state durations for each relay

The output scales can be changed by Modbus commands by using the conﬁguration software and the standard conﬁguration kit (see Modbus RTU Communication).

Return to default settings

To reset the device’s Slave ID, baud rate, and stop bit numbers to factory settings, proceed as follows:

De-energize the device
Connect the X6 jumper
Turn on the device
De-energize the device
Disconnect the X6 jumper
Turn on the device

Modbus RTU Communication

RS485 communication interface

Communication parameters

Parameter	Permitted values	Default
Supported baud rates	1200, 2400, 4800, 9600, 19200, 38400, 57600	9600
Data bits	8	8
Parity	none / odd / even	none
Stop bits	1, 2	1
Protocol	Modbus RTU

Modbus functions

| 03 – Read multiple registers 06 – Write a single register

Error codes

| 01 – Illegal function

02 – Illegal data address 03 – Illegal data value 04 – Slave device failure

(details of last error 04 can be read from register 0x0008)

Modbus holding registers

Register addresses are shown 0-based, Address in hexadecimal, Reg in decimal format. Modbus holding register numbers MHR are shown in the decimal 1-based format and may be addressed either from 00001 or 40001 base.

Address| Reg / MHR| RW| Description| Supported values (dec)| Default
---|---|---|---|---|---
0x0001| 1 / 40002| R| Hardware version| | –
0x0002| 2 / 40003| R| Software version| | –
0x0003| 3 / 40004| R| Product serial number| 1…65535| –
0x0004| 4 / 40005| RW| Slave ID (net address) *| 1…247 *| 1
0x0005| 5 / 40006| RW| Baud rate | 1200, 2400, 4800, 9600,

19200, 38400, 57600

| 9600
0x0006| 6 / 40007| RW| Response delay, ms| 1…255| 10
---|---|---|---|---|---

0x0007

|

7 / 40008

|

RW

|

Stop bits, parity bit *

| 1 – No parity bit, 1 stop bit (default after factory reset) 2 – No parity bit, 2 stop bits 3 – Odd parity, 1 stop bit

4 – Even parity, 1 stop bit NOTE : 3 and 4 are available starting from the Software version 0x218 (dec. 536)

|

1

0x0008| 8 /40009| R| Last error code| 1…255| –

0x0011

|

17 / 40018

|

RW

| Technological:

age of last data in seconds (read) / restart (write)

| 0…65535 s (read),

writing 42330 restarts the instrument

|

–

0x00A5| 165 /

40166

| RW| Zero adjustments for gas data, ADC| -32000…+32000 ADC units| 0
---|---|---|---|---|---
0x00A6| 166 /

40167

| RW| Slope adjustment for gas data| 1…65535| 512
0x00A7| 167 /

40168

| RW| The change rate limit for gas units / s| 1…32000, 0 – no limit| 0

0x00A8

|

168 /

40169

|

RW

|

Integrating ﬁlter time constant, s

|

1…32000 (seconds), 0 – no ﬁlter

|

0

0x00C9

|

201 /

40202

|

RW

|

Parameter tied to analog output 1

| 0 – None

2 – Gas concentration

9 – Forced Modbus control, value set in MHR / 40204

|

2

0x00CA

|

202 /

40203

|

RW

|

Parameter tied to analog output 2

| 0 – None

2 – Gas concentration

9 – Forced Modbus control, value set in MHR / 40205

|

2

0x00CB

|

203 /

40204

|

RW

|

Forced value for analog output 1***

| 0…1000

(0.0%.. 100.0% of output

scale)

|

0

0x00CC

|

204 /

40205

|

RW

|

Forced value for analog output 2***

| 0…1000

(0.0%.. 100.0% of output

scale)

|

0

0x00D3

|

211 /

40212

|

RW

|

Parameter tied to relay RE1

| 0 –none

2 – gas concentration

9 – control by Modbus control, state set in MHR / 40214

|

2

---|---|---|---|---|---

0x00D4

|

212 /

40213

|

RW

|

Parameter tied to relay RE2

| 0 – none

2 – gas concentration 9- – control by Modbus

control, state set in MHR / 40215

|

2

0x00D5

| 213 /

40214

|

RW

| Forced state for relay RE1***|

0 –off, 1 – on

|

0

0x00D6| 214/ 40215| RW| Forced state for relay RE2***| 0 – off, 1 – on| 0

0x00D7

| 215 /

40216

|

RW

| Switching delay for relay RE1| 0…1000 (s)|

0

0x00D8

| 216 /

40217

|

RW

| Switching delay for relay RE2| 0…1000 (s)|

0

0x00D9| 217 /

40218

| RW| Minimal on/off time for relay RE1| 0…1000 (s)| 0

0x00DA

| 218 /

40219

|

RW

| Minimal on/off time for relay RE2| 0…1000 (s)|

0

Address| Reg / MHR| RW| Description| Supported values (dec)| Default
---|---|---|---|---|---
| | | | |

0x00DB

| 219 /

40220

|

RW

|

Control logic for relay RE1

| 0 – none

1 – relay on at high values 2 – relay on at low values

|

0

0x00DC

| 220 /

40221

|

RW

|

Control logic for relay RE2

| 0 – none

1 – relay on at high values 2 – relay on at low values

|

0

0x00DD

| 221 /

40222

|

RW

|

LOW setpoint for relay RE1

|

0…65535 (gas units)

| see Speciﬁcations
---|---|---|---|---|---
0x00DE| 222 /

40223

| RW| HIGH setpoint for relay RE1| 0…65535 (gas units)| see Speciﬁcations

0x00DF

| 223 /

40224

|

RW

|

LOW setpoint for relay RE2

|

0…65535 (gas units)

| see Speciﬁcations
0x00E0| 224 /

40225

| RW| HIGH setpoint for relay RE2| 0…65535 (gas units)| see Speciﬁcations

Address

|

Reg / MHR

|

RW

|

Description

|

Supported values (dec)

|

Default

---|---|---|---|---|---

0x00FF

|

255 /

40256

|

RW

|

Sensor, analog outputs, LED and buzzer status

| bit[0]=0/1 – sensor present/absent, RO bit[1]=0/1 – analog outputs deactivated/activated bit[2]=0/1 – in case the sensor is absent, turn signaling off/on analog output1

bit[3]=0/1 – in case the sensor is absent, turn on signaling with low current/high current on analog output1; if bit[2]=0 this bit will be ignored bit[4]=0/1 – in case of sensor absent, turn signaling off/on analog output2 bit[5]=0/1 – in case of sensor absent, turn on signaling with low current/high current on analog output2; if bit[4]==0 this bit will be ignored bit[6]=0/1 – current/voltage output detected on output1, RO

bit[7]=0/1 – current/voltage output detected on output2, RO

bit[8]=0/1 – LED

deactivated/activated bit[9]=0/1 – buzzer deactivated/activated bit[10]=0/1 – LED is on/off in normal condition

|

user deﬁned

| | | | bit[11]=0/1 – 1 Hz (50% on, 50% off) LED signal off/on if relay1 turned on

bit[12]=0/1 – 2 Hz (50% on, 50% off) LED signal off/on if relay2 turned on

|
---|---|---|---|---|---
0x0101| 257 /

40258

| R| Raw gas sensor data| 0…4095, ADC units|
0x0103| 259 /

40260

| R| Gas concentration, gas units| 0…65535, gas units|

0x0105

| 261 /

40262

|

RW

| 0% value

for analog output 1

|

-32000…+32000, gas units

| User deﬁned

0x0106

| 262 /

40263

|

RW

| 100% value

for analog output 1

|

-32000…+32000, gas units

| User deﬁned

0x0107

| 263 /

40264

|

RW

| 0% value

for analog output 2

|

-32000…+32000, gas units

| User deﬁned

0x0108

| 264 /

40265

|

RW

| 100% value

for analog output 2

|

-32000…+32000, gas units

| User deﬁned

The new value is applied after restart.
Broadcast slave ID 0 can be used to assign a new ID to the instrument with an unknown ID. When addressing by ID 0 the device shall be the only Modbus instrument in the network. The device will not respond to the Master command when addressed by ID 0.
This value is dynamic and not kept in EEPROM after a restart.

Warranty

This product is warranted to be free from defects in material and workmanship for a period of one year from the date of the original sale. During this warranty period, the Manufacturer will, at its option, either repair or replace a product that proves to be defective. This warranty is void if the product has been operated in conditions outside ranges speciﬁed by the Manufacturer or damaged by customer error or negligence or if there has been an unauthorized modiﬁcation.

Manufacturer contacts
Evikon MCI OÜ
Teaduspargi 7/9, Tartu
50411 Estonia
[email protected]
www.evikon.eu