Evikon PluraSens E2608-PID User manual

PluraSens®
Solvent Vapor Detector-Transmitter
E2608-PID
User Manual

E2608-PID 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
PID (photoionization detector) technology 13
Operating conditions 13
Installation guidelines 14
Wall mount version 14
Duct mount version 14
Mounting dimensions 15
Sensor probe handling 16
Gas sensor replacement procedures 16
Electrical connections 17
Operation 18
Properties of VOC: ionization energy, the correction factor 19
Calibration and maintenance 28
Delivery set 32
Order code for E2608-PID options 32
Configuring 33
Return to default settings 33
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E2608-PID Rev 05.03.2021
Modbus RTU Communication 34
RS485 communication interface 34
Communication parameters 34
Modbus holding registers 34
Warranty 39
Manufacturer contacts 39
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E2608-PID Rev 05.03.2021
Acetone
A colorless organic solvent with a characteristic pungent odor that is volatile and
flammable with the chemical formula (CH3)2CO.
Synonyms/Trade Names: Dimethyl ketone, Ketone propane, 2-Propanone.
Chemical formula
(CH3)2CO
Molar weight
58
Relative gas density (to air)
2.0
Conversion*
1 ppm = 2.38 mg/m3
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/m3/ 500 ppm
NIOSH REL TWA
590 mg/m3/250 ppm
IDLH (NIOSH)
2500 ppm [10%LEL]
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E2608-PID Rev 05.03.2021
Benzene
A colorless liquid with an aromatic odor that is highly flammable with the molecular
formula C6H6.
Synonyms/Trade Names: Benzol, Phenyl hydride.
Chemical formula
C6H6
Molar weight
78
Relative gas density (to air)
2.69
Conversion*
1 ppm = 3.19 mg/m3
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/m3/0.1 ppm
STEL
15 minutes
1 ppm
Ca IDLH
500 ppm
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E2608-PID Rev 05.03.2021
Ethanol
A clear colorless liquid with a faintly sweet odor and pungent taste.
Synonyms/Trade Names: ethyl, alcohol.
Chemical formula
CH3CH2OH
Molar weight
46
Relative gas density (to air)
1,59
Conversion*
1 ppm = 1.89 mg/m3
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/m3/ 1000 ppm
STEL
15 minutes
-
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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.
Chemical formula
C4H8O2
Molar weight
88
Conversion*
1 ppm = 3.60 mg/m3
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/m3/400 ppm
IDLH
2000 ppm [10%LEL]
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E2608-PID Rev 05.03.2021
Toluene
A clear, colorless liquid with a sweet smell that is highly flammable.
Synonyms/Trade Names: methylbenzene, phenylmethane.
Chemical formula
C6H5CH3
Molar weight
92
Conversion*
1 ppm = 3.77 mg/m3
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/mm3/ 50 ppm
STEL
384 mg/mm3/ 100 ppm
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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.
Chemical formula
C6H4(CH3)2
Isomers
ortho-xylene meta-xylene para-xylene
Molar weight
106
Conversion*
1 ppm = 4.34 mg/m3
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/mm3/ 50 ppm
STEL
15 minutes
442 mg/mm3/ 100 ppm
Conversion of ppm to mg/m3is calculated for 25°C and 1 atm.
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Specifications
Detected gases
VOCs with ionisation potential < 10.6 eV
Sampling method
Diffusion
Sensor type
Photoionization detector
Calibration
Isobutylene
Order code
E2608-PID-40
E2608-PID-200
Typical detection
ranges
0...40 ppm (isobutylene)
0...200 ppm (isobutylene)
Resolution / digital unit
1 ppb
1 ppm
Response time T90
< 3 s
Sensor lifetime
5 years
Calibration interval
Monthly or more frequently depending on operating conditions
Signal update
Every 1 second
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
Power supply
11...30 VDC (default),
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
Relay outputs
2 × SPST, max 5 A, 30 VDC / 250 VAC
Alarm setpoints
Determined by the user within 5-95% of the detection range
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)
EN 60079-29-1:2016, EN 60079-29-2:2015 and EN 60079-29-3:2014
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E2608-PID Rev 05.03.2021
Operating conditions
-40...+65ºC; 0,9...1,1 atm
0...95% RH non-condensing,
Explosion safe indoor areas, Non-aggressive atmosphere
Other options
Remote probe
Protection IP65, default cable length 3.0 m;
max height 80 mm, max diameter 65 mm
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E2608-PID 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.
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E2608-PID Rev 05.03.2021
PID (photoionization detector) technology
The gas under investigation diffuses into the sensor’s testing cell, equipped with a source
of high energy UV light (10.6 eV Krypton lamp) and electrodes. Exposed to UV light, organic
molecules decompose to form ions, which are attracted by the electrodes. The measured
resulting current is proportional to the VOC concentration.
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.
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E2608-PID 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.
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E2608-PID Rev 05.03.2021
Mounting dimensions
Wall mount version with mounting lugs
Duct mount version
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E2608-PID 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.
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 PID sensor from the device,
5. Insert the new PID sensor inside,
6. Put back the O-ring rubber, PTFE filter, and the head cap, respectively.
In most cases replacing the lamp and electrode stack can bring the sensor back to life.
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E2608-PID 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 mm2. 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 mm2or 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.
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E2608-PID Rev 05.03.2021
Operation
Turn on the power. The instrument warm-up time takes ≤1 minute after switching on and
the final sensor stabilization time to maximum accuracy takes <5 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, 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.
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E2608-PID Rev 05.03.2021
Properties of VOC: ionization energy, the correction factor
Sensors used in E2608-PID are calibrated using isobutylene, but the PID is a broadband
VOC detector, with a sensitivity that differs for each VOC. If you know what VOC you are
measuring, then the table below will allow you to calculate the concentration for your
specific VOC. Only the most common substances are listed in the table, if you can’t find
your compound of concern, please contact us.
NOTE! These are approximate values, so for the best accuracy, you should calibrate with
the relevant VOC.
The table includes the following columns:
1. The most common name for the VOC or other substances,
2. CAS No; You can find the VOC using the CAS No,
3. Brutto-formula,
4. Ionization energy (IE), (eV)
5. Relative Response/ Correction Factor (CF), Also called the Response Factor (RF).
Multiply the displayed concentration by the Relative Response/CF/RF to calculate
the actual concentration of the VOC.
6. Minimum Detection Level (MDL) Also called Minimum Detectable Quantity (MDQ).
The typical lowest concentration that can be detected. The sensor used in
E2608-PID-40 has greater sensitivity than that in E2608-PID-200, so the MDL for
the E2608-PID-40 will be much less than the MDL for the E2608-PID-200.
The Relative Response/CF/RF is measured in dry air; high humidity will reduce this factor
by 30% to 50%, so the CF/RF should be increased in high humidities. Relative sensitivity is
the inverse of the correction factor, specifying the percent response of the VOC, relative to
isobutylene. If less than 100%, then the VOC is less responsive than isobutylene; if the
relative sensitivity is greater than 100%, then the VOC is more responsive than isobutylene.
Relative sensitivity (%) is specified in the same way as cross-sensitivity for toxic gas
sensors.
VOC response
The PID can not measure all VOCs or gases, two types of VOCs are not measured:
NR: No response. The lamp does not ionize the VOC and the VOC cannot be measured.
NV: The vapor pressure of the VOC at 20°C is less than a few ppm, so this Semi-Volatile
Organic Compound (SVOC) cannot be measured.
NA: Not available
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E2608-PID Rev 05.03.2021
Occasionally you will be measuring a mixture of VOCs. If the total concentration is within
the linear range of your PID, then it is reasonable to assume that the concentrations are
additive without interference between the different VOCs. Remember that if you are
measuring a combination of VOCs, then the accurate measurement of one of these VOCs
will be difficult; without careful data analysis, you will get only a CF averaged measurement.
Be cautious when reporting actual VOC concentration if you know that there may be
several VOCs present.
Balance gas
The relative response is measured in laboratory air, with 20.9% oxygen, balanced nitrogen.
Some gases absorb UV light without causing any PID response (e.g. methane, ethane). In
ambient atmospheres where these gases are present, the measured concentration of
target gas will be less than is actually present.
Methane absorbs UV strongly, so for accurate measurements in methane containing
atmospheres, calibrate with a calibration gas containing the expected methane
concentration. 50% of LEL methane reduces the reading by up to 50%. Gases such as
nitrogen and helium do not absorb UV and do not affect the relative response.
The correction factor for a gas mix containing PID detectable gases A, B, C… with response
factors RF(A), RF(B), RF(C), in relative proportions a: b: c… is given by:
CF(mix) = 1 / [(a/CF(A) + b/CF(B) + c/CF(C)…]
Accuracy of the Table: This table is for indication only. Table accuracy is 1 to 2 digits only,
so when calculating concentration for a specific VOC, only specify to 1 or 2 digits.
Index
Chemical name
Alternative name
Formula
CAS no.
IE, eV
Response
Factor (RF)
10.6 eV
E2608-
PID-40
MDL
(ppb)
E2608-
PID-200
MDL
(ppb)
1
Acetaldehyde
C2H4O
75-07-0
10.23
5.5
25
480
2
Acetamide
C2H5NO
60-35-5
9.69
2
3
Acetic acid
C2H4O2
64-19-7
10.66
28
180
3615
4
Acetic anhydride
C4H6O3
108-24-7
10.14
4
20
400
5
Acetone
2-propanone,
dimethyl ketone
C3H6O
67-64-1
9.69
1.17
5
70
6
Acetonitrile
CH3CN
75-05-8
12.2
NR
7
Acetophenone
1-phenylethan-1
-one, methyl
phenyl ketone
C8H8O
98-86-2
9.29
0.6
9
Acetylene
ethyne
C2H2
74-86-2
11.4
NR
10
Acrolein
propenal
C3H4O
107-02-8
10.22
3.2
20
400
20