Evikon PluraSens E2608-VOC User manual

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PluraSens®
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Solvent Vapor Detector-Transmitter
E2608-VOC
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User Manual
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E2608-VOC Rev 05.03.2021
Table of contents
Acetone 4
Benzene 5
Ethanol 6
Ethyl acetate 7
Toluene 8
Xylene 9
Specifications 10
Product description 12
Safety requirements 12
Operating conditions 12
Installation guidelines 13
Wall mount version 13
Duct mount version 13
Mounting dimensions 14
Sensor probe handling 15
Electrical connections 16
Operation 17
Maintenance 17
Calibration 17
Delivery set 18
Order code for E2608-VOC options 18
Configuring 19
Return to default settings 19
Modbus RTU Communication 20
RS485 communication interface 20
Communication parameters 20
2

E2608-VOC Rev 05.03.2021
Modbus holding registers 20
Warranty 25
Manufacturer contacts 25
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3

E2608-VOC Rev 05.03.2021
Acetone
A colorless organic solvent with a characteristic pungent odor that is volatile and            
flammable with the chemical formula (CH3)2CO.
Synonyms/Trade Names: Dimethyl ketone, Ketone propane, 2-Propanone.
 
4
Chemical formula
(CH3)2CO
Molar weight
58
Relative gas density (to air)
2.0
Conversion*
1 ppm = 2.38 mg/m3
Boiling point
56.11 °C
Low explosive limit (LEL), % vol. in air
2.5
Upper explosive limit (UEL), % vol. in air
12.8
Odor
Characteristic pungent smell
Hazards
Highly flammable.
Slightly toxic in normal use. Irritant causing mild skin
irritation and moderate to severe eye irritation. At high
vapor concentrations, it may depress the CNS.
Exposure limits
8 hours
(2000/39/EC)
1900 mg/m3 / 500 ppm
NIOSH REL TWA
590 mg/m3 /250 ppm
IDLH (NIOSH)
2500 ppm [10%LEL]

E2608-VOC Rev 05.03.2021
Benzene
A colorless liquid with an aromatic odor that is highly flammable with the molecular             
formula C6H6.
Synonyms/Trade Names: Benzol, Phenyl hydride.

 
5
Chemical formula
C6H6 
Molar weight
78
Relative gas density (to air)
2.69
Conversion*
1 ppm = 3.19 mg/m3
Boiling point
80 °C
Low explosive limit (LEL), % vol. in air
1.2
Upper explosive limit (UEL), % vol. in air
7.8
Odor
Hyacinth-like odor
Hazards
Highly flammable.
Irritant. Carcinogen.
May cause dizziness; headache, nausea, staggering
gait; anorexia, lassitude.
Target organs: eyes, skin, respiratory system, blood,
central nervous system, bone marrow.
Exposure limits
(NIOSH REL)
Ca TWA
0.319 mg/m3 /0.1 ppm
STEL
15 minutes
1 ppm
Ca IDLH
500 ppm

E2608-VOC Rev 05.03.2021
Ethanol
A clear colorless liquid with a faintly sweet odor and pungent taste.
Synonyms/Trade Names: ethyl, alcohol.
 
6
Chemical formula
CH3CH2OH
Molar weight
46
Relative gas density (to air)
1,59
Conversion*
1 ppm = 1.89 mg/m3
Boiling point
78.37°C
Low explosive limit (LEL), % vol. in air
3 - 3.3
Upper explosive limit (UEL), % vol. in air
19
Odor
The characteristic smell of alcohol
Hazards
Highly flammable.
Gas/air mixtures are explosive.
Inhalation of vapors leads to cough, headache, fatigue,
and drowsiness. High concentrations may damage the
fetus. Repeated high exposure may affect the liver and
the nervous system.
Exposure limits 
according to 
Commission
Directive 2006/15/EC
TWA
8 hours
1210 mg/m3 / 1000 ppm
STEL
15 minutes
-

E2608-VOC Rev 05.03.2021
Ethyl acetate
A colorless organic compound with a sweet pear-like smell that is highly flammable.
Synonyms/Trade Names: ethyl ester, acetic ester, EA, EtOAc.

 
7
Chemical formula
C4H8O2
Molar weight
88
Conversion*
1 ppm = 3.60 mg/m3
Boiling point
77.1 °C
Low explosive limit (LEL), % vol.     
in air
2
Upper explosive limit (UEL), %    
vol. in air
11.5
Odor
Sweet “pear” smell
Hazards
Flammable.
Short-term exposure to high levels of ethyl acetate results first in
irritation of the eyes, nose, and throat, followed by headache,
nausea, vomiting, sleepiness, and unconsciousness.
Exposure limits 
(NIOSH)
TWA
8 hours
1400 mg/m3 /400 ppm
IDLH
2000 ppm [10%LEL]

E2608-VOC Rev 05.03.2021
Toluene
A clear, colorless liquid with a sweet smell that is highly flammable.
Synonyms/Trade Names: methylbenzene, phenylmethane.
 
8
Chemical formula
C6H5CH3 
Molar weight
92
Conversion*
1 ppm = 3.77 mg/m3
Boiling point
110.7°C
Low explosive limit (LEL), % vol.     
in air
1.1 - 1.27
Upper explosive limit (UEL), %    
vol. in air
6.75–7.1
Odor
Characteristic “chemical” smell
Hazards
Highly flammable.
Gas/air mixtures are explosive.
Inhalation possible effects: irritation eyes, nose; lassitude
(weakness, exhaustion), confusion, euphoria, dizziness,
headache; dilated pupils, lacrimation (discharge of tears); anxiety,
muscle fatigue, insomnia; paraesthesia; dermatitis; liver, kidney
damage
Exposure limits 
according to 
Commission
Directive
2006/15/EC
TWA
192 mg/mm3 / 50 ppm
STEL
384 mg/mm3 / 100 ppm

E2608-VOC Rev 05.03.2021
Xylene
A colorless, flammable liquid with a chemical smell. Xylenes are produced by the            
methylation of toluene and benzene.
The term is used for any of three isomers of dimethylbenzene, or a combination thereof.
Synonyms/Trade Names: xylol, dimethylbenzene.

Conversion of ppm to mg/m3 is calculated for 25°C and 1 atm.


 
9
Chemical formula
C6H4(CH3)2
Isomers

ortho-xylene  meta-xylene  para-xylene
Molar weight
106
Conversion*
1 ppm = 4.34 mg/m3
Boiling point
144.4 °C
139 °C
138.35 °C
Low explosive limit (LEL), % vol.     
in air
0.9 - 1.1
Upper explosive limit (UEL), % vol.     
in air
6.0–7.0
Odor
Characteristic “chemical” smell
Hazards
Flammable.
Inhaling can cause dizziness, headache, drowsiness, and nausea.
Exposure limits 
according to 
Commission
Directive
2000/39/EC
TWA
8 hours
221 mg/mm3 / 50 ppm
STEL
15 minutes
442 mg/mm3 / 100 ppm

E2608-VOC Rev 05.03.2021
Specifications

10
Detected vapors
Toluene, Xylene, Ethanol, and other solvents
Sampling method
Diffusion
Sensor type
Metal oxide semiconductor
Default calibration
Toluene
Typical detection
range
0...100% LEL
0...1000 ppm
Resolution / digital unit
0.1% LEL
1 ppm
Alarm setpoints
(set/release)
RE1 (LOW): 20/16 % LEL;
RE2 (HIGH): 50/40% LEL;
RE1 (LOW): 100/80 ppm;
RE2 (HIGH): 300/240 ppm;
Response time T90
< 120 s
Sensor lifetime
> 5 years
Calibration interval
12 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
Load resistance
RL < (Us - 2 V) / 22 mA for 4-20 mA
RL > 250 kOhm for 0-10 V mode
Digital interface
RS485, Modbus RTU protocol
No galvanic isolation
Analog outputs
2 × 4-20 mA / 0-10 V, user settable
Outputs assignment
OUT1: Gas; OUT2: Gas
Output scale width
> 10 × resolution
Recommended: 20-100% of the detection range
Relay outputs
2 × SPST, max 5 A, 30 VDC / 250 VAC
Cable connections
Screwless spring-loaded terminals
Enclosure
Light beige ABS, wall mount, protection class IP65
Dimensions
H87 × W82 × 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)

E2608-VOC Rev 05.03.2021


11
EN 60079-29-1:2016, EN 60079-29-2:2015 and EN 60079-29-3:2014
Operating conditions
-40...+70°C; <95% RH non-condensing, 0,9...1,1 atm
Explosion safe indoor areas
Normal ambient oxygen level
Avoid strong mechanical shock, vibrations, or EMI
Avoid exposure to corrosive gases or silicone-containing products
Other options
Remote probe
Protection IP65, default cable length 3.0 m;
max height 80 mm, max diameter 65 mm

E2608-VOC Rev 05.03.2021
Product description
E2608 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.
E2608 series provides two independent analog outputs OUT1 and OUT2, user-selectable to           
4-20 mA or 0-10 V. RS485 Modbus RTU digital communication interface allows easy            
instrument configuration and integration into various automation systems.
Two relays RE1 and RE2 with closing dry contacts can be used to switch alarm sirens,               
ventilation fans, shut-off valves, or other actuators. Remote probe, duct mount version and            
24 VAC or 230 VAC power supply options are available.
The version of your detector-transmitter 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.
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.
12

E2608-VOC Rev 05.03.2021
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.),
●Solvent vapors are heavier than air, so the gas detector-transmitter should be           
placed near the floor or 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 detector-transmitters         
should be distributed evenly in the room.
For personal safety control, the detector-transmitters are installed in the breathing zone (at            
the height of the head of people or animals). The recommended sensor position is vertical,              
pointing downwards.
Wall mount version
Attach the mounting lugs to the back of the detector-transmitter using the provided            
screws. Screw the device to the wall through the mounting lug holes (for dimensions see              
the drawing in the next section).
Duct mount version
Cut a hole with a diameter of 36...45 mm in the air duct at the chosen mounting place.                 
Place the rubber flange aligning the holes in the flange and the air-duct and fix the flange                
with four self-tapping screws. Pass the sensor probe through the flange and adjust it to the               
appropriate depth. Unscrew four lid screws and detach the lid from the           
detector-transmitter.

13

E2608-VOC Rev 05.03.2021
Mounting dimensions
Wall mount version with mounting lugs
Duct mount version
14

E2608-VOC Rev 05.03.2021
Sensor probe handling
The wall-mount version of the detector-transmitter is available with a remote probe (see            
drawing below for dimensions). 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.

NOTE! Metal oxide semiconductor sensors are not replaceable.
15

E2608-VOC Rev 05.03.2021
Electrical connections
Unscrew four lid screws and detach the lid from the device. Use the M16 cable gland to let                 
in cables of the power supply and of the external devices. Attach the power cable to the                
device without turning it on. Using the connection diagram below, connect the analog            
outputs and digital interface terminals to the relevant devices according to your tasks.

Version without PSU Version with PSU

The screwless quick connect spring terminals on the E2608 series devices are suitable for             
a wide range of wires with a cross-section of 0.2...1.5 mm2. We recommend to strip the               
wire end by 8...9 mm and use 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 mm2or 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.
16

E2608-VOC Rev 05.03.2021
Operation
Turn on the power. The instrument warm-up time takes about 5 minutes after switching on              
and the final sensor stabilization time to maximum accuracy takes about 60 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:

Make sure that the detector-transmitter is properly mounted, the external devices          
connected, power LED (green) on, and the control LED (red) is constantly lit. Place the lid               
back and fix it with the screws. 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
E2608-VOC 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 12 month. Please contact your dealer for more            
information.

17
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

E2608-VOC Rev 05.03.2021
Delivery set
●Detector-transmitter E2608 (wall mount or duct mount version)
●Mounting accessories:
○4 cross-shaped mounting lug with screws and 4 screws with plastic          
dowels for wall mount version
○Square Rubber flange for Duct mount option
○Round rubber flange for Remote probe option
○Fixing clamp for Remote probe option




Order code for E2608-VOC options


18
E2608 options
Order code
Remote probe, 3 m cable
E2608-VOC-RP33-3
Remote probe, 10 m cable
E2608-VOC-RP33-10
Duct mount option, stem Ø35×L230 mm
E2608-VOC-DM
Integrated 90...265 V mains power supply module
E2608-VOC-230
Integrated 24 VAC power supply module 
E2608-VOC-24VAC
Remote LCD single value display, wall mount box
115 × 65 × 40mm, 3 m cable
E2608-VOC-RLCD3

E2608-VOC Rev 05.03.2021
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.
Gas detector-transmitters E2608 share all functionalities of the PluraSens®multifunctional         
detector-transmitter 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
 
19

E2608-VOC Rev 05.03.2021
Modbus RTU Communication
RS485 communication interface

Communication parameters
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.

20
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
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)
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