Ethylene oxide

Other names: epoxyethane, ethylene oxide, dimethylene oxide, oxacyclopropane,

1,2-Epoxy ethane. Proper IUPAC name: oxirane.

Highly reactive, toxic and flammable colourless gas.

Ethylene oxide is one of the most important raw materials used in large-scale chemical production. It is used also as a sterylant and fungicide.

Chemical formula

Molar weight

Relative gas density (to air)

Conversion

Boiling point

Low explosive limit (LEL), % vol in air

C

2

H

4

O

44

1.52

1 ppm = 1.80 mg/m

10.7 °C

3

Upper explosive limit (UEL), % vol in air 100

Odour Pungent, ether-like

3

Odour threshold

Hazards

430 ppm

Flammable.

Gas/air mixtures are explosive.

Ethylene oxide is a slow poison with carcinogenic, mutagenic, irritating, and anaesthetic effect

Exposure routes are inhalation, ingestion, (liquid), skin and/or eye contact.

Exposure limits

(OSHA)

TWA

STEL

1 ppm

5 ppm

Conversion of ppm to mg/m 3 is calculated for 25°C and 1 atm.

Installation guidelines

(See Installation and connections section for general information.)

Ethylene oxide is 1.5 times higher than air. It is very reactive, so it should be detected as early as possible.

Calibration

E2648-ETO detectors have been calibrated by Manufacturer with standard gas mixtures before delivery. Provided that the sensor is used under moderate conditions,the recommended interval for field recalibration is 6 months. Please contact your dealer for more information.

E2648-ETO_UM_EN

Specifications

Sensor type

Sampling method

Typical detection range

Maximum overload

Resolution / digital unit

Response time T90

Sensor lifetime

Calibration interval

Signal update

Load resistance

Digital interface

Power supply options

Power consumption

Analog outputs

Outputs assignment

Outputs scale width

Cable connections

Enclosure

Dimensions

CE marking

Operating conditions

Rev 05.06.2020

0...20 ppm

100 ppm electrochemical cell diffusion

0...100 ppm

200 ppm

0.1 ppm

< 120 s

1 ppm

<140s

> 2 years

6 months every 1 second

R

L

R

< (Us - 2 V) / 22 mA for 4-20 mA

L

> 250 kOhm for 0-10 V mode

RS485, Modbus RTU protocol no galvanic isolation

11...30 VDC, 24 VAC or 90...265 VAC

< 2 VA

2 × 4-20 mA / 0-10 V, user settable

OUT1 2 gas; OUT2 2 gas not below 10 × resolution recommended: 20-100% of the detection range screwless spring loaded terminals die-cast aluminium, wall mount, protection class IP66

H120 × W125 × D57 mm according to 2014/30/EU and EN61326-1 requirements

-20...+50 °C, 15...90% RH non-condensing, 0,9...1,1 atm explosion safe areas, non-aggressive atmosphere

NOTE The sensor may exhibit sensitivity to carbon monoxide, toluene and other organic compounds

Relay option

Output relays

Default alarm setpoints

(set/release)

2 × SPST relays (closing contact),

250 VAC / 30 VDC, 5 A max

LOW: 2 ppm/ 1.6 ppm

HIGHt 5 ppm/ 4 ppm defined by user

within 5-95% of the detection range

Other options

Remote probe protection IP65, default cable length 3.0 m; max height 80 mm, max diameter 65 mm

Ethylene Oxide Detector-Transmitter

E2648-ETO

User Manual

PluraSens ®

Evikon MCI OÜ Teaduspargi 7/9, Tartu [email protected]

Tel. +372 733 6310 50411 Estonia www.evikon.eu

E2648 series heavy duty detectors-transmitters belong to the PluraSens® family of multifunctional measurement instruments. The instruments utilise gas sensors of various types with excellent repeatability, stability and long lifetime. Due to its IP66 enclosure of die cast aluminium, the device may be used under harsh conditions.

E2648 series provides two independent analog outputs OUT1 and OUT2, userselectable to 4-20 mA or 0-10 V, proportional either to gas concentration or temperature.

RS485 Modbus RTU digital communication interface allows easy instrument configuration and integration into various automation systems.

The following features are available as 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

Integrated 230 V mains power supply module

Remote probe.

The version of your device is marked on the package.

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

Safety requirements

Misuse will impair the protection of the equipment.

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.

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 in explosion-safe areas. Avoid strong mechanical shock, vibrations or EMI. Avoid corrosive atmosphere and areas highly contaminated with dust, oil mist etc. Keep the device away from direct sunlight.

See Specification table for more details.

Mounting dimensions

Installation

Before proceeding with the installation it is mandatory to read carefully the Safety

requirements section and make sure to comply with all listed instructions. During the installation of the device 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 air flows etc), detected gas (relative density to air, temperture, whether the gas is flammable, or toxiс, or oxygen displacing), safety: strong vibrations, mechanical shock, and the sources of strong electromagnetic interference should be avoided, the device should be accessible for maintenance and repair.

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. Do not locate the detector close to ventilation openings and strong air currents. Avoid the areas without air circulation (corners, niches) as well. 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). Recommended sensor position is vertical, pointing downwards. See

Installation guidelines section for more information.

The device is fixed on the wall using two holes located outside the sealed area of the device (NOTE Dimensional drawings and connection diagrams are presented on a separate sheet.).

Connections

NOTE Dimensional drawings and connection diagrams are presented on a separate sheet.

1. Unscrew four lid screws and detach the lid from the device.

2. Attach the device to the wall. (This step may be done after the step 3, consider your convenience).

3. Use two M16 cable glands 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.

The screwless quick connect spring terminals on the E2648 series devices are suitable for a wide range of wires with cross-section 0,2...1,5 mm to strip the wire end by 8...9 mm and use the wire end sleeves.

2 . We recommend

To connect the wire, insert the wire end into terminal hole. To disconnect, push the spring loaded terminal lever, pull the wire out, and release the lever.

Use twisted pair cable, e.g. LiYY TP 2×2×0,5 mm 2 or CAT 5, to connect the device to RS485 network. Use one pair for A and B wires to connect the transmitter to

Fieldbus network. Respect polarity.

The type of each analog output can be independently changed between 4-20 mA and 0-10 V with jumpers J1 (OUT1) and J2 (OUT2). With closed jumper the output is 0-10 V, with open jumper the output is 4-20 mA. Power restart is required after changing the position of the jumpers.

By default both outputs OUT1 and OUT2 are assigned to gas concentration. The device has built-in temperature sensor which may be tied to any of the outputs. The built-in temperature sensor is intended for temperature compensation. E2648 series devices are not meant for ambient air temperature measurement.

We recommend to set the difference between the upper and bottom limits of the output scale not narrower than 20% of detection range (for CO detectors the scales down to 5% of range are allowed). In any case, do not set the output scale below the tenfold resolution of the device.

NOTE The outputs are not galvanically isolated from 24 V power supply and share common 0V. Allowed load resistance limits are stated in Specifications table. To power the instrument from an external 24 VDC 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 use external fuses or safety switches.

4. Turn on the power. The sensor heating up takes ca. 60 seconds after switching on.

The operating status is indicated by the LED on the PCB of the device. The LED response to different processes is presented in the table below.

Process LED mode

Sensor absence or malfunction Blinking 0.5 Hz (90% off, 10% on)

Relay 1 turned on Blinking 1 Hz (50% on, 50% off)

Relay 2 turned on

Modbus response

Normal operating

Blinking 2 Hz (50% on, 50% off)

The signal is modulated with short on-off pulses, even single Modbus cycle is traceable*

Continuous light

5. Make sure that the device is properly installed, the external devices connected, power on and control LED is constantly lit. Make certain that the cable glands are properly tightened to ensure the conformity to IP66 protection class. Place the lid back and fix it with the screws. The device is ready to use.

Remote sensor probe handling

The E2648 series devices are available with remote probe (dimensional drawing is

presented on a separate sheet). The remote probe is connected to the main unit with shielded cable. Default connection cable length is 3 m. 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 may be replaced if it gets strongly contaminated. To replace the PTFE filter, unscrew the M25 nut and remove the old filter. Place a new filter into the nut and tighten it again.

NOTE Never stab or press the filter near its centre where the sensor is located since this may damage the sensor. The recommended orientation of sensor probe is vertical with the sensor tip pointing downwards. This prevents possible accumulation of condensed water on the sensor protection filter.

Return to default settings

To reset the device’s Slave ID, baudrate and sbit number to factory settings: proceed as follows

1. De-energize the device

2. Connect the J3 jumper

3. Turn on the device

4. De-energize the device

5. Disconnect the J3 jumper

6. Turn on the device

Configuring

Detectors- transmitters E2648 share all functionalities of the PluraSens ® multifunctional platform. The features and options include:

- digital output change rate limiting filter

- digital integrating (averaging) filter

- temperature measurement channel with internal sensor

- free assignment of each analog output to chosen parameter

- flexible setting of analog output scales for each output

- output shift and slope adjustment for calibration

- free assignment of each of two relays to chosen parameter

- several relay control logic modes

- switch delays and minimum on/off state durations for each relay

A standard configuration kit includes a USB-RS485 converter and a software pack.

Please contact your Seller for more information.

RS485 communication interface

See Annex 1

Maintenance

Do not perform any maintenance operation with the power on.

Clean the device with soft damp cloth. Do not use any abrasive cleaning agents. Do not immerse the device into water or any cleaning media.

Delivery set

–Detector-transmitter E2648

– Mounting accessories:

2 screws with plastic dowels fixing clamp for remote probe version

Warranty

This product is warranted to be free from defects in material and workmanship for a period of one year from the date of original sale. During this warranty period

Manufacturer will, at its option, either repair or replace product that proves to be defective. This warranty is void if the product has been operated in conditions outside ranges specified by Manufacturer or damaged by customer error or negligence or if there has been an unauthorised modification.

E2648_UM_EN DRAWINGS AND DIAGRAMS

DIMENSIONS

Enclosure

CONNECTION DIAGRAMS

E2648 basic version

NOTES

E2648 with relays

Remote probe

E2648_UM_EN. Annex 1. E2648 series Modbus RTU Communication Reference

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 single register

Communication parameters

Parameter Permitted values

Supported baudrates

Data bits

Parity

Stop bits

Protocol

1200, 2400, 4800, 9600, 19200,

38400, 57600

8 none / odd / even

1, 2

Modbus RTU

Default

9600

8 none

1

Modbus functions 03 - read multiple registers

06 - write 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)

E2648 series Modbus holding registers

Register addresses are shown 0-based, Addr in hexadecimal, Reg in decimal format.

Modbus holding register numbers MHR are shown in decimal 1-based format, and may be addressed either from 00001 or 40001 base.

Addr Reg / MHR RW Description Supported values (dec)

0x0001

0x0002

0x0003

0x0004

0x0005

0x0006

0x0007

0x0008

1 / 40002

2 / 40003

3 / 40004

4 / 40005

5 / 40006

6 / 40007

7 / 40008

8 / 40009

R

R

R

RW

RW

RW

RW

R

Hardware version

Software version

Product serial number

Slave ID (net address) *

Baudrate *

Response delay, ms

Stop bits, parity bit *

Last error code

1...65535

1...247 **

1200, 2400, 4800, 9600, 19200, 38400, 57600

1...255

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...255

0x0011 17 / 40018 RW Restarts counter write ‘42330’ to restart device

* – The new value is applied after restart.

** – Broadcast slave ID 0 can be used to assign a new ID to device with unknown ID. When addressing by ID 0 the device shall be the only Modbus instrument in the network. The device will not respond to Master command when addressed by ID 0.

*** – This value is dynamic and not kept in EEPROM after restart

Default

9600

10

1

-

-

-

1

-

-

E2648 series Modbus holding registers (part 2)

Register addresses are shown 0-based, Addr in hexadecimal, Reg in decimal format.

Modbus holding register numbers MHR are shown in decimal 1-based format, and may be addressed either from 00001 or 40001 base.

Addr Reg / MHR RW Description Supported values (dec)

0x00A2

0x00A5

0x00A6

162 / 40163 RW

Zero adjustment for temperature data,

°C × 100

165 / 40166 RW Zero adjustment for gas data, ADC

166 / 40167 RW Slope adjustment for gas data

-32000...+32000 (-320,00...+320,00 °C)

-32000...+32000 ADC units

1...65535

0x00A7

0x00A8

167 / 40168 RW

Change rate limit for gas data, gas unit / s

168 / 40169 RW Integrating filter time constant, s

0x00C9

0x00CA

0x00CB

0x00CC

0x00D3

0x00D4

0x00D5

0x00D6

0x00D7

0x00D8

0x00D9

0x00DA

201 / 40202 RW

202 / 40203 RW

203 / 40204 RW

204 / 40205 RW

211 / 40212 RW

212 / 40213 RW

213 / 40214 RW

214/ 40215 RW

215 / 40216 RW

216 / 40217 RW

217 / 40218 RW

218 / 40219 RW

Parameter tied to analog output 1

Parameter tied to analog output 2

Forced value for analog output 1***

Forced value for analog output 2***

Parameter tied to relay RE1

Parameter tied to relay RE2

Forced state for relay RE1***

Forced state for relay RE2***

Switching delay for relay RE1

Switching delay for relay RE2

Minimal on/off time for relay RE1

Minimal on/off time for relay RE2

1...32000, 0 - no limit

1...32000 (seconds), 0 - no filter

0 – none

1 – temperature

2 – gas concentration

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

0 – none

1 – temperature

2 – gas concentration

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

0...1000 (0,0%...100,0% of output scale)

0...1000 (0,0%...100,0% of output scale)

0 – none

1 – temperature

2 – gas concentration

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

0-none

1 – temperature

2 – gas concentration

9 – control by Modbus control, state set in MHR / 40215

0 – off, 1 – on

0 – off, 1 – on

0...1000 (s)

0...1000 (s)

0...1000 (s)

0...1000 (s)

* – The new value is applied after restart.

** – Broadcast slave ID 0 can be used to assign a new ID to device with unknown ID. When addressing by ID 0 the device shall be the only Modbus instrument in the network. The device will not respond to Master command when addressed by ID 0.

*** – This value is dynamic and not kept in EEPROM after restart

Default

0

0

512

0

0

2

2

0

0

2

0

0

0

0

0

2

0

E2648 series Modbus holding registers (part 3)

Register addresses are shown 0-based, Addr in hexadecimal, Reg in decimal format.

Modbus holding register numbers MHR are shown in decimal 1-based format, and may be addressed either from 00001 or 40001 base.

Addr Reg / MHR RW Description Supported values (dec)

0x00DB

0x00DC

219 / 40220

220 / 40221

RW

RW

Control logic for relay RE1

Control logic for relay RE2

0 – none

1 – relay on at high values

2 – relay on at low values

3 – relay on at values within the range

4 – relay on for the values out of the range

0 – none

1 – relay on at high values

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 / 40222 RW LOW setpoint for relay RE1 0...65535 (gas units)

0x00DE

0x00DF

0x00E0

0x00FF

0x0101

0x0102

0x0103

0x0105

0x0106

0x0107

0x0108

222 / 40223

223 / 40224

224 / 40225

255 / 40256

RW

RW

RW

RW

HIGH setpoint for relay RE1

LOW setpoint for relay RE2

HIGH setpoint for relay RE2

Sensor, analog outputs, LED and buzzer status

257 / 40258 R Raw gas sensor data

258 / 40259 R Measured temperature, °C×100

259 / 40260 R Gas concentration, gas units

261 / 40262 RW 0% value for analog output 1

262 / 40263 RW 100% value for analog output 1

263 / 40264 RW 0% value for analog output 2

264 / 40265 RW 100% value for analog output 2

0...65535 (gas units)

0...65535 (gas units)

0...65535 (gas units) bit[0]=0/1 – sensor present/absent, read-only!

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, read-only!

bit[7]=0/1 – current/voltage output detected on output2, read-only!

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 bit[11]=0/1 – LED and buzzer syncing off/on with RE1 bit[12]=0/1 – LED and buzzer syncing off/on with RE2

ADC data 0...4095

signed integer, -4000...+12500 (-40,00...+125,00 °C) signed integer, -32000...+32000 (gas units)

-32000...+32000 (gas unit/°C)

-32000...+32000 (gas unit/°C)

-32000...+32000 (gas unit/°C)

-32000...+32000 (gas unit/°C)

Default user defined

0

0 see

Specifications see

Specifications see

Specifications see

Specifications user defined user defined user defined user defined

* – The new value is applied after restart.

** – Broadcast slave ID 0 can be used to assign a new ID to device with unknown ID. When addressing by ID 0 the device shall be the only Modbus instrument in the network. The device will not respond to Master command when addressed by ID 0.

*** – This value is dynamic and not kept in EEPROM after restart

NOTE 1 range.

Relay setpoints should be set within 5-95% of the detection

NOTE 2 Sensor absense signalling (bits from [2] to [5]) is available only for sensors with digital interface ( e.g.-CO2 10K, -O2-L).

NOTE 3 LED/buzzer signalization (if activated):

Detectable sensor absence or malfunction

0.5Hz (90% off, 10% on) light and/or sound signal

Relay1 turned on

Relay2 turned on

1 Hz (50% on, 50% off) light and/or sound signal, depending on bit[8], bit[9] and bit[11]

2 Hz (50% on, 50% off) light and/or sound signal, depending on bit[8], bit[9] and bit[12]

Modbus response

Normal operating the light signal is modulated with short on-off pulses, even single Modbus cycle is visible continuously on/off depending on bit[10]

NOTE 4 We recommend to set the difference between the upper and bottom limits of the output scale not narrower than 20% of detection range (for CO detectors the scales down to 5% of range are allowed). In any case, do not set the output scale below the tenfold resolution of the device.