Evikon E2658-C2H4 Ethylene detector User Guide

E2658-C2H4 Ethylene detector
User Guide

Ethylene Detector-Transmitter
E2658-C2H4
User Manual

Ethylene

Extremely flammable colorless gas. Widely used as a raw material in the polymer industry and as a fruit ripener.

to prevent excessive exposure to ethylene
Hazards| Extremely flammable.
Gas/air mixtures are explosive.
Excessive exposure by inhalation may cause headaches,
dizziness, anesthesia, drowsiness, unconsciousness, or
other central nervous system effects.
Exposure limits (ACGIH)| TWA| 200 ppm
STEL| not established

Conversion of ppm to mg/m³ is calculated for 25°C and 1 atm.

Specifications

Sampling method

|

Diffusion

---|---
Sensor type| Electrochemical cell
Typical  detection range| 0…10 ppm| 0…200 ppm| 0…1500 ppm
Max. overload| 20 ppm| 500 ppm| 2000 ppm
Resolution / digital unit| 0.1% ppm| 1 ppm| 1 ppm
Response time T80| < 60 s
Sensor lifetime| > 2 years
Calibration interval| 6 months
Signal update| Every 1 second
Power supply| 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 aluminum, 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 19 ATEX 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…+50°C, up to 100% RH, 0,9…1,1  atm
Explosion-safe zones  and ATEX Zones 2 and 22
Avoid strong mechanical shock, vibrations, or EMI Avoid exposure to corrosive gases
NO T E : The sensor may exhibit sensitivity to CO
Relay option
Output relays| 2 × SPST relays (closing contact), 250 VAC / 30 VDC, 5 A max
Alarm set-points| Determined by the user within  5-95% of the detection range

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.

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.),
• Ethylene 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 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

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.

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.

Jum p er s

J1| OUT1 type (open: 4-20 mA; closed 0-10 V)
J2| OUT2 type (open: 4-20 mA; closed 0-10 V)
X6| Reset Modbus network parameters to default
X4 t e r min a ls
OU T 1| 4-20 mA / 0-10 V output
OU T 2| 4-20 mA / 0-10 V output
0V| 0 V / 24 VAC Neutral (optional)
A| RS485 A / Data +
B| RS485 B / Data –
+U| +24 VDC / 24 VAC Phase (optional)
X5 terminals ( op t ion a l)
L| 90…265 VAC Phase
N| 90…265 VAC Neutral
RE1 N O| Relay 1, normally open terminal
RE1 C O M| Relay 1, common terminal
RE2 N O| Relay 2, normally open terminal
RE2 C O M| Relay 2, common terminal

The screwless quick-connect spring terminals on the E2658 series devices are suitable for a wide range of wires with cross-sections 0,5…1,5 mm 2. 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,  but depending on the sensor type, it can take up to several hours. 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 m o de

---|---
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 are connected, the power LED (green) is 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 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-C2H4 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-C2H4 options

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.
Detector-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:

1. De-energize the device
2. Connect the X6 jumper
3. Turn on the device
4. De-energize the device
5. Disconnect the X6 jumper
6. Turn on the device

Modbus RTU Communication

RS485 communication interface

Databits: 8
Parity: none / odd / even
Stop bits: 1 or 2
Protocol: Modbus RTU| Supported Modbus functions:
03 – Read multiple registers
06 – Write a single register
---|---

Communication parameters

P ar am e t e r

| P ermitted v a l ues|

D ef a ul t

---|---|---
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| D e s c r ip t ion| Supported v alues (dec)|

D ef a ul t

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

1…65535

|

512

0x00A7

| 167 /

40168

|

RW

| The change rate limit for|

1…32000, 0 – no limit

|

0

0x00A8

|

168 /

40169

|

RW

|

Integrating filter time constant, s

|

1…32000 (seconds),

|

0

Address| Reg / MHR| RW| D e s c r ip t ion| Supported v alues (dec)| D ef a ul t
0x00C9| 201/40202| RW| Parameter tied to analog output 1| 0 – None
2 – Gas concentration
9 – Forced Modbus control, the 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, the 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

| | RW| Parameter tied to relay RE1| 0 –none|

2

---|---|---|---|---|---
211 /| 2 – gas concentration
40212| 9 – control by Modbus control,

state set in MHR / 40214

0x00D4

| |

RW

| Parameter tied to relay RE2| 0 – none|

2

212 /| 2 – gas concentration
9- – control by Modbus
40213| control, state set in MHR /40215

0x00D5

| 213 /|

RW

| Forced state for relay RE1***| 0 –off, 1 – on|

0

40214
0x00D6|

214/ 40215

|

RW

| Forced state for relay RE2***| 0 – off, 1 – on|

0

0x00D7| 215 /|

RW

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

0

40216
0x00D8| 216 /| RW| Switching delay for relay RE2| 0…1000 (s)|

0

40217
0x00D9| 217 /|

RW

| Minimal on/off time for relay RE1|

0…1000 (s)

|

0

40218
0x00DA| 218 /| RW| Minimal on/off time for relay RE2| 0…1000 (s)|

0

40219
Address| Reg / MHR| RW| D e s c r ip t ion| Supported v alues (dec)| D ef a ul t
---|---|---|---|---|---
0x00DB| | RW| Control logic for relay RE1| 0 – none| 0
219 /| 1 – relay on at high values
40220| 2 – relay on at low values
3 – relay on at values within the range
4 – relay on for the values out of the range
0x00DC| | RW| Control logic for relay RE2| 0 – none| 0
220 /| 1 – relay on at high values
40221| 2 – relay on at low values
3 – relay on at values within the range
4 – relay on for the values out of the range
0x00DD| 221 /| RW| LOW setpoint for relay RE1| 0…65535 (gas units)| see
---|---|---|---|---|---
40222| Specifications
0x00DE| 222 /|

RW

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

see

40223| Specifications
0x00DF| 223 /| RW|

LOW setpoint for relay RE2

|

0…65535 (gas units)

|

see

40224| Specifications
0x00E0| 224 /|

RW

| HIGH setpoint for relay RE2| 0…65535 (gas units)| see
40225| Specifications
| | | 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 /| R| Raw gas sensor  data| 0…4095, ADC units|
40258|
0x0103| 259 /|

R

| Gas concentration,|

0…65535, gas units

|
40260| gas units|
0x0105| 261 /|

RW

| 0% value|

-32000…+32000, gas units

| User
40262| for analog output 1| defined
0x0106| 262 /|

RW

| 100% value|

-32000…+32000, gas units

| User
40263| for analog output 1| defined
0x0107| 263 /|

RW

| 0% value|

-32000…+32000, gas units

| User
40264| for analog output 2| defined
0x0108| 264 /| RW| 100% value| -32000…+32000, gas units| User
40265| for analog output 2| 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
info@evikon.eu
www.evikon.eu

References

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