Evikon PluraSens E2638-HFC Manuale utente
PluraSens®
Refrigerant Detector-Transmitter
E2638-HFC
User Manual
E2638-HFC Rev 21.06.2021
Table of contents
Hydrofluorocarbons 3
Specifications 5
Product description 7
Safety requirements 7
Operating conditions 8
Installation guidelines 8
Mounting dimensions 9
Sensor probe handling 10
Gas sensor replacement procedures 10
Electrical connections 11
Correct and incorrect cabling for 24 VAC 13
Operation 14
Maintenance 14
Calibration 14
Delivery set 15
Order code for E2638-HFC options 15
Configuring 16
Return to default settings 16
Modbus RTU Communication 17
RS485 communication interface 17
Communication parameters 17
Modbus holding registers 17
Warranty 22
Manufacturer contacts 22
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E2638-HFC Rev 21.06.2021
Hydrofluorocarbons
HFCs are relatively non-flammable, chemically stable, and nonreactive.
Classification of halocarbon refrigerants
Group
Refrigerants
Chlorofluorocarbons (CFC)
R11, R12
Hydrochlorofluorocarbons
(HCFC)
R22, R141b, R142b
Hydrofluorocarbons (HFC)
R32, R125, R134a, R143a
Hydrofluoroolefins (HFO)
R 1234ez, R1234yf, R1336mzz
Chlorine-containing refrigerants (CFC and HCFC) are considered to be damaging to the ozone layer
and contributing to the greenhouse effect. According to the Montreal Protocol, chlorine-containing
halocarbons should be completely dismissed and their manufacturing closed down.
Hydrofluorocarbons (HFC) contain no chlorine and are safer for the environment. Now
hydrofluorocarbons are the most commonly used halocarbon refrigerants.
Hydrofluoroolefins (HFO) is the last generation of refrigerants, more environmentally friendly than
HFCs, but moderately flammable (A2L Class).
Properties of selected halocarbons
Name
Type
Components
Components weight %
Boiling point
R12
CFC
CCl2F2
100
−29.8 °C
R22
CFC
CHClF2
100
−40.8 °C
R125
HFC
CHF2CF3
100
−48.5 °C
R134a
HCFC
CF3CH2F
100
−26.2°C
R143a
HCFC
CF3CH3
100
-47.5 °C
R32
HFC
CH2F2
100
−52 °C
R1234yf
HFO
2,3,3,3-Tetrafluoropropene
100
-30 °C
R1234ze
HFO
1,3,3,3-Tetrafluoropropene
100
-19 °C
R404a
mixture
R125, R143a, R134a
44:52:4
−47.8 °C
R407c
mixture
R32, R125, R134a
23:25:52
−43 °C
R410a
mixture
R32, R125
50:50
−48.5 °C
Overexposure may cause dizziness and loss of concentration. At higher concentrations, CNS
depression and cardiac arrhythmia may result from exposure. Vapors displace air and can cause
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E2638-HFC Rev 21.06.2021
asphyxiation in confined spaces. At higher temperatures (>250°C) decomposition products may
include hydrofluoric acid (HF) and carbonyl halides.
An escape of refrigerant through a leak may damage the refrigerating facilities.
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E2638-HFC Rev 21.06.2021
Specifications
Sampling method
Diffusion
Sensor type
Standard: Metal oxide semiconductor
NDIR sensor available on demand
Typical detection range
0...1000 ppm
Resolution / digital unit
1 ppm
Response time T90
<120 s
Sensor lifetime (MOS)
> 5 years
Calibration interval
12 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
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
Cable connections
Screwless spring loaded terminals
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
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
Operating conditions
(MOS sensor)
-30...+60 °C; <95% RH non-condensing, 0,9...1,1 atm
Explosion-safe areas
Normal ambient oxygen level
Avoid exposure to corrosive gases or silicon containing products
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E2638-HFC Rev 21.06.2021
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
RE2 (HIGH): set 500 ppm; release 400 ppm
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-HFC Rev 21.06.2021
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-HFC Rev 21.06.2021
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.),
●Halocarbons are heavier than air and tend to sink. The sensor should be placed
near the floor.
●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-HFC Rev 21.06.2021
Mounting dimensions
Front view
Bottom view
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E2638-HFC Rev 21.06.2021
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 NDIR sensor from the device,
5. Insert the new NDIR sensor inside,
6. Put back the O-ring rubber, PTFE filter, and the head cap, respectively.
NOTE! Metal oxide semiconductor sensors are not replaceable.
10
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