Evikon PluraSens E2638 Series Manuel utilisateur
PluraSens®
Ethylene Oxide Detector-Transmitter
E2638-ETO
User Manual
E2638-ETO Rev 10.03.2021
Table of contents
Ethylene oxide 3
Specifications 4
Product description 6
Safety requirements 6
Operating conditions 7
Installation guidelines 7
Mounting dimensions 8
Sensor probe handling 9
Gas sensor replacement procedures 9
Electrical connections 10
Operation 12
Maintenance 12
Calibration 12
Delivery set 13
Order code for E2638-ETO options 13
Configuring 14
Return to default settings 14
Modbus RTU Communication 15
RS485 communication interface 15
Communication parameters 15
Modbus holding registers 15
Warranty 20
Manufacturer contacts 20
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E2638-ETO Rev 10.03.2021
Ethylene oxide
Ethylene oxide is a highly reactive, toxic, and flammable colorless gas and one of the most
important raw materials used in large-scale chemical production. It is used also as a
sterilant and fungicide.
Other names: epoxyethane, ethylene oxide, dimethylene oxide, oxacyclopropane, 1,2-Epoxy
ethane. Proper IUPAC name: oxirane.
Chemical formula
C2H4O
Molar weight
44
Relative gas density (to air)
1.52
Conversion
1 ppm = 1.80 mg/m3
Boiling point
10.7 °C
Low explosive limit (LEL), % vol. in air
3
Upper explosive limit (UEL), % vol. in air
100
Odor
Pungent, ether-like
Odor threshold
430 ppm
Hazards
Flammable.
Gas/air mixtures are explosive. Ethylene oxide is a slow
poison with carcinogenic, mutagenic, irritating, and
anesthetic effect
Exposure routes are inhalation, ingestion, (liquid), skin,
and/or eye contact.
Exposure limits
(OSHA)
TWA
1 ppm
STEL
5 ppm
Conversion of ppm to mg/m3is calculated for 25°C and 1 atm.
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E2638-ETO Rev 10.03.2021
Specifications
Sensor type
Electrochemical cell
Sampling method
Diffusion
Typical detection range
0...20 ppm
0...100 ppm
Maximum overload
100 ppm
200 ppm
Resolution / digital unit
0.1 ppm
1 ppm
Outputs scale
0-200
0-100
Response time T90
< 120 s
< 150 s
Sensor lifetime
>2 years
Calibration interval
6 months
Signal update
Every 1 second
Power supply
11...30 VDC,
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 gas; OUT2 gas
NOTE! for LCD version only output 1 is available
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
Enclosure
Grey ABS, wall mount, protection class IP65
Dimensions
H90 × W145 × D55 mm
(overall dimensions H140 × W145 × 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...+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
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E2638-ETO Rev 10.03.2021
Relay option
Output relays
2 × SPST relays (closing contact),
250 VAC / 30 VDC, 5 A max
Default alarm setpoints
(set/release)
LOW: 2 ppm/ 1.6 ppm HIGH 5
ppm/ 4 ppm
Determined by user
within 5-95% of the range
Signalling options
Visual
Red and green LEDs
Acoustic alarm
Buzzer 85 dB
LCD indicator option
Operating temperature
0...+50 °C
Display dimensions
72 × 36 mm
Number of digits
3.5, 7-segment
Character height
14 mm
Other features
Backlight
Other options
Remote probe
Protection IP65, default cable length 3.0 m;
max height 80 mm, max diameter 65 mm
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E2638-ETO Rev 10.03.2021
Product description
E2638 series detectors-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.
E2638 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,
●Acoustic (85 dB buzzer) and visual (red and green LED) signaling,
●24 VAC or 230 VAC as options for power supply module,
●LCD indicator,
●Remote probe.
The version of your device 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.
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.
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E2638-ETO Rev 10.03.2021
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.
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 oxide is 1.5 times heavier than air. It is recommended to locate the
sensor not higher than the potential leakage.
●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 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.
For installing the device, attach the device to the wall using provided screws through the
side mounting holes or key slots (see mountains dimensions).
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E2638-ETO Rev 10.03.2021
Mounting dimensions
Front view
Bottom view
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E2638-ETO Rev 10.03.2021
Sensor probe handling
The E2638 series devices are available with a remote probe. 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 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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E2638-ETO Rev 10.03.2021
Electrical connections
Unscrew four lid screws and detach the lid from the device. 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.
Version with PSU and relays Version with PSU and without relays
Version without PSU and with relays Version without PSU and relays
10
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