Evikon PluraSens E2618-N2O User manual

PluraSens®
Nitrous Oxide Transmitter
E2618-N2O
User Manual

E2618-N2O Rev 08.05.2023
Table of contents
Nitrous Oxide 3
Specifications 4
Product description 5
Safety requirements 5
Operating conditions 5
Installation guidelines 6
Wall mount version 6
Duct mount version 6
Mounting dimensions 7
Sensor probe handling 8
Gas sensor replacement procedures 8
Electrical connections 9
Correct and incorrect cabling for 24 VAC 10
Operation 11
Maintenance 11
Calibration 11
Delivery set 12
Order code for E2618-N2O options 12
Configuring 13
Return to default settings 13
Modbus RTU Communication 14
RS485 communication interface 14
Communication parameters 14
Modbus holding registers 14
Warranty 18
Manufacturer contacts 18
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E2618-N2O Rev 08.05.2023
Nitrous Oxide
Nitrous oxide is a colorless non-flammable gas, with a slight metallic scent and taste. It is
also known as laughing gas or nitrous.
Chemical formula
N2O
Molar weight
44
Relative gas density (to air)
1.53
Conversion
1 ppm= 1.8 mg/m3
Boiling point
-88.48 °C
Odor
Slightly sweetish
Hazards
Will support combustion, and may increase the intensity
of the fire. Containers may explode when heated.
Inhalation causes intense analgesia; concentrations of
over 40-60% cause loss of consciousness preceded by
hysteria. Contact of liquid with eyes or skin causes
frostbite burn.
Exposure
limits (ACGIH)
TWA
25 ppm
Conversion of ppm to mg/m3is calculated for 25°C and 1 atm.
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E2618-N2O Rev 08.05.2023
Specifications
Sensor type
Optical (NDIR)
Sampling method
Diffusion
Typical detection range
0...1000 ppm
Max. overload
2000 ppm
Resolution
1 ppm
Response time T90
< 30s
Sensor lifetime
> 5 years
Calibration interval
12 months
Signal update
Every 1 second
Power supply
12...36 VDC (default)
24 VAC as option
Power consumption
< 2 VA
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
Analog outputs
2 × 4-20 mA / 0-10 V, user settable
Outputs assignment
OUT1 2 gas; OUT2 2 gas
Output scale width
> 10 × resolution
Recommended: 20-100% of the detection range
Enclosure
Grey ABS, wall mount, protection class IP65
Dimensions
H82 × W80 × 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 °C to +50 °C
0 to 95% RH non-condensing;
0,9...1,1 atm; explosion-safe areas
Non-aggressive atmosphere
NOTE: The sensor has cross-sensitivity to CO2, ask from manufacturer
details
Other options
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E2618-N2O Rev 08.05.2023
Remote probe
Protection IP65, default cable length 3.0 m;
max-height 80 mm, max diameter 65 mm
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E2618-N2O Rev 08.05.2023
Product description
E2618 series 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.
E2618 series provide two independent analog outputs OUT1 and OUT2, user-selectable to
4-20 mA or 0-10 V, proportional to the chosen scale for gas concentration. RS485 Modbus
RTU digital communication interface allows easy instrument configuration and integration
into various automation systems. 24 VAC is available as options.
Remote probe and duct mount versions are available.
The version of your transmitter is marked on the package. If the ⚠ symbol is marked on
the product, 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.
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E2618-N2O Rev 08.05.2023
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 transmitter the following
points must be considered:
●Application (air quality and leakage control.)
●Properties of the space under investigation (room geometry, direction, and
velocity of airflows, etc.),
●Nitrous oxide is heavier than air. The recommended location is close to or below
the potential leakage 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 transmitter should be
distributed evenly in the room.
For personal safety control, the 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
Unscrew four lid screws and detach the lid from the transmitter. Attach the device to a wall
with screws passing through mounting 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 transmitter.
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E2618-N2O Rev 08.05.2023
Mounting dimensions
Wall mount version
Duct mount version
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E2618-N2O Rev 08.05.2023
Sensor probe handling
The wall mount version of the 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 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.
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E2618-N2O Rev 08.05.2023
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.
PCB without PSU and relays
Jumpers
J1
OUT1 type (open: 4-20 mA; closed 0-10 V)
J2
OUT2 type (open: 4-20 mA; closed 0-10 V)
X6
Reset Modbus network parameters to default
X4 terminals
OUT1
4-20 mA / 0-10 V output
OUT2
4-20 mA / 0-10 V output
0V
0 V / 24 VAC Neutral (optional)
A
RS485 A / Data +
B
RS485 B / Data -
+U
+24 VDC / 24 VAC Phase (optional)
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