Evikon PluraSens E2638 Series User manual

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PluraSens®
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Sulfur Hexafluoride Detector-Transmitter
E2638-SF6
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User Manual
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E2638-SF6 Rev 10.03.2021
Table of contents
Sulfur hexafluoride 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-SF6 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-SF6 Rev 10.03.2021
Sulfur hexafluoride
A colorless, odorless, non-flammable, non-toxic gas, five times heavier than air. Sulfur           
hexafluoride has excellent dielectric properties almost three times better than air and           
nitrogen. It works well as an arc quencher in circuit breakers and electrical switchgear.
Although SF6is not immediately dangerous to health, the leakage detection is necessary            
due to costs and environmental considerations, since SF6is the most potent greenhouse            
gas known.
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Conversion of ppm to mg/m3 is calculated for 25°C and 1 atm.
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3
Chemical formula
SF6
Molar weight
146,1
Conversion
1 ppm = 5.98 mg/m3
Relative gas density (to air)
5.03
Boiling point
-50.8℃
Flammability
Non-flammable
Odor
Odorless
Hazards
Non-toxic, but may contain highly toxic sulfur
pentafluoride (S2F10) as an impurity.
Electrical discharge may decompose to form toxic
products.
Extremely potent greenhouse gas.
Exposure limits
NIOSH REL TWA = OSHA PEL TWA
1000 ppm (6000 mg/m3)

E2638-SF6 Rev 10.03.2021
Specifications
4
Sensor type
Dual-beam NDIR
Sampling method
Diffusion
Typical detection range
0...1000 ppm
0...2000 ppm
Resolution / digital unit
1 ppm
Response time T90
< 30 s
Sensor lifetime
> 5 years
Calibration interval
1 year
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
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
Enclosure
Grey ABS, wall mount, protection class IP65
Dimensions
H90 × 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; 0...95% RH non-condensing, 0,9...1,1 atm
Explosion-safe areas, Non-aggressive atmosphere
Relay option
Output relays
2 × SPST relays (closing contact),
250 VAC / 30 VDC, 5 A max
Default alarm setpoints
RE1 (LOW): set 100 ppm; release 80 ppm

E2638-SF6 Rev 10.03.2021
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RE2 (HIGH): set 500 ppm; release 400 ppm
Visual alarm
Red and green LEDs (option)
Acoustic alarm
Buzzer 85 dB (option)
LCD 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

E2638-SF6 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-SF6 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.),
●Sulfur Hexafluoride is heavier than air. The recommended location is close to or            
below the 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 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-SF6 Rev 10.03.2021
Mounting dimensions
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Front view
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Bottom view
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E2638-SF6 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.
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A) Wall mount remote probe with fixing clamp (default version),
B) Remote probe with rubber flange and three self-tapping screws (on request)
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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-SF6 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.
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Version with PSU and relays Version with PSU and without relays
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Version without PSU and with relays Version without PSU and relays
10