Evikon PluraSens E2648-NH3-S User manual

PluraSens®
Ammonia Detector-Transmitter
E2648-NH3-S
User Manual

E2648-NH3-S Rev 22.06.2021
Table of contents
Ammonia 3
Specifications 4
Product description 6
Safety requirements 6
Operating conditions 7
Installation guidelines 7
Mounting dimensions 8
Sensor probe handling 9
Electrical connections 10
Correct and incorrect cabling for 24 VAC 12
Operation 13
Maintenance 13
Calibration 13
Delivery set 14
Order code for E2648-NH3-S 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
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E2648-NH3-S Rev 22.06.2021
Ammonia
A colorless gas, highly soluble in water, with a characteristic pungent smell.
Ammonia is a large-scale production of the chemical industry widely used as a raw
material for the production of fertilizers and explosives, as a refrigerant, as a cleaning and
antimicrobial agent.
Ammonia is also produced naturally from the decomposition of organic matter, including
plants and animals.
Chemical formula
NH3
Molar weight
17
Relative gas density (to air)
0.59
Conversion
1 ppm = 0.70 mg/m3
Boiling point
-33.3 °C
Low explosive limit (LEL), % vol. in air
15
Upper explosive limit (UEL), % vol. in air
28
Odor
Characteristic pungent smell
Odor detection threshold
0.04 ppm ...57 ppm according to different studies
Hazards
Ammonia is irritant to the skin, eyes, and respiratory
tract. Ammonia inhalation causes breathing difficulties
(wheezing). High concentrations may lead to pulmonary
edema.
Exposure limits
(Directive 2000/39/EC)
TWA
14 mg/m3/ 20 ppm
STEL
36 mg/m3/ 50 ppm
Conversion of ppm to mg/m3is calculated for 25°C and 1 atm.
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E2648-NH3-S Rev 22.06.2021
Specifications
Sampling method
Diffusion
Sensor type
Metal oxide semiconductor
Typical detection range
0...1000 ppm
Resolution / digital unit
1 ppm
Response time T90
ca. 60 s
Sensor lifetime
> 5 years
Calibration interval
12 months
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
Cable connections
Screwless spring-loaded terminal
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
Outputs scale width
> 10 × resolution
Recommended: 20-100% of the detection range
Enclosure
Die-cast aluminum, wall mount, protection class IP66
Dimensions
H120 × W125 × D57 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
-40...+50 °C; <95% RH non-condensing, 0,9...1,1 atm
Explosion-safe areas
Normal ambient oxygen level
Avoid exposure to corrosive gases or volatile silicon-containing
compounds
NOTE! The sensor may exhibit sensitivity to hydrogen sulfide.
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E2648-NH3-S Rev 22.06.2021
Relay option
Output relays
2 × SPST relays (closing contact),
250 VAC / 30 VDC, 5 A max
Default alarm setpoints
RE1 (LOW): set 25 ppm; release 20 ppm
RE2 (HIGH): set 35 ppm; release 28 ppm
Other options
Remote probe
Protection IP65, default cable length 3.0 m;
max height 80 mm, max diameter 65 mm
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E2648-NH3-S Rev 22.06.2021
Product description
E2648 series heavy duty 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. Due to its IP66 enclosure of
die-cast aluminum, the device may be used under harsh conditions.
E2648 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 module,
●Remote probe.
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.
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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E2648-NH3-S Rev 22.06.2021
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 transmitter the following
points must be considered:
●Application (the instrument is intended for leakage control.)
●Properties of the space under investigation (room geometry, direction, and
velocity of airflows, etc.),
●Ammonia is lighter than air, so the sensor should be placed higher than the
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 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.
Do not locate the detector close to ventilation openings and strong air currents. Avoid the
areas without air circulation (corners, niches) as well.
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.
Unscrew four lid screws and detach the lid from the transmitter. Attach the device to a wall
with screws passing through mounting holes. The device is fixed on the wall using two
holes located outside the sealed area of the device.
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E2648-NH3-S Rev 22.06.2021
Mounting dimensions
Front view
Bottom view
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E2648-NH3-S Rev 22.06.2021
Sensor probe handling
The E2648 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.
NOTE! Metal oxide semiconductor sensors are not replaceable.
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E2648-NH3-S Rev 22.06.2021
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 with PSU and relays Version with PSU and without relays
Version without PSU and with relays Version without PSU and relays
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