Evikon PluraSens E2658 Series User manual

PluraSens®
Nitrous Oxide Detector-Transmitter
E2658-N2O
User Manual

E2658-N2O Rev 12.03.2021
Table of contents
Nitrous Oxide 3
Specifications 4
Product description 6
Safety requirements 6
Operating conditions 7
Installation guidelines 7
Mounting dimensions 9
Sensor probe handling 10
Gas sensor replacement procedures 10
Electrical connections 11
Operation 13
Maintenance 13
Calibration 13
Delivery set 14
Order code for E2658-N2O options 14
Configuring 15
Return to default settings 15
Modbus RTU Communication 16
RS485 communication interface 16
Communication parameters 16
Modbus holding registers 16
Warranty 21
Manufacturer contacts 21
2

E2658-N2O Rev 12.03.2021
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.
3

E2658-N2O Rev 12.03.2021
Specifications
Sensor type
Optical (NDIR)
Sampling method
Diffusion
Typical detection range
0...1000 ppm
Max. overload
2000 ppm
Resolution / digital unit
1 ppm
Response time T90
< 30s
Sensor lifetime
> 5 years
Calibration interval
12 months
Signal update
Every 1 second
Power supply
11...30 VDC (default),
Options 24 VAC or 90...265 VAC
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
Cable connections
Screwless spring-loaded terminals
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
Diecast aluminum, wall mount, protection class IP66
Dimensions
H80 × W125 × D57 / H80 × W175 × D80 mm
Protection
Flameproof, ATEX: II 2 GD, Ex ed IIC T4 Gb
CE marking
According to 2014/30/EU and 2014/34/EU,
EN 61000-6-3:2020, EN 61326-1:2013 (EMC, Emissions)
EN 61000-6-1:2019, EN 61000-6-2:2019, EN 61326-2-1:2013 (EMC,
Immunity)
EN 60079-0:2018, EN 60079-1:2014, EN 60079-31:2014,
EN 60079-29-1:2016, EN 60079-29-2:2015, EN 60079-29-3:2014
4

E2658-N2O Rev 12.03.2021
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 may exhibit sensitivity to CO2
Relay option
Relay outputs
2 × SPST, max 5 A, 30 VDC / 250 VAC
Default alarm setpoints
(set/release)
RE1 (LOW): 50/40 ppm
RE2 (HIGH): 100/80 ppm
Determined by the user within 5-95% of the detection range
5

E2658-N2O Rev 12.03.2021
Product description
E2658 is a series of flameproof gas detectors-transmitters intended for operation in safe
zones and ATEX Zones 2 and 22. E2658 series devices are based on PluraSens®
multifunctional platform and provide all its features. The instruments utilize gas sensors of
various types with excellent repeatability, stability, and long lifetime.
E2658 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,
●24 VAC or 230 VAC as options for power supply
The version of your detector 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.
It is crucial to tighten properly all the thread connections (screws, cable glands). Use ATEX
certified armored cables or cable conduits that are rated for use in the desired
environment.
A disconnecting device that is marked as such and easily accessible should be included in
the installation of this product.
The device should be properly earthed.
6

E2658-N2O Rev 12.03.2021
Operating conditions
The device should be used in a basic electromagnetic environment, where the latter is
defined in EN 61326-1. Avoid strong mechanical shock and vibrations. Although E2658
series devices are suitable for use in the presence of flammable dust, special precautions
should be taken when operating in a dusty environment. Dust may block the porous filter of
the sensor and compromise the results of the measurement. The detector should be
inspected regularly if used in a dusty atmosphere. Keep the instrument away from direct
sunlight. A sudden temperature or humidity change might affect the sensitivity of the
sensor. Make sure that installation and maintenance are performed in an explosion safe
atmosphere.
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.),
●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 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.
7

E2658-N2O Rev 12.03.2021
The device is fixed on the wall using two fixing holes located outside the sealed area of the
device (see dimensional drawing). Unscrew four lid screws and detach the lid from the
detector. Fix the detector on the wall and earth the enclosure using an earthing terminal on
the side of the device.
NOTE! Never perform installation or maintenance in an explosive atmosphere!
8

E2658-N2O Rev 12.03.2021
Mounting dimensions
Front view
Bottom view
9

E2658-N2O Rev 12.03.2021
Sensor probe handling
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,
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.
10