Evikon E2638-H2S Manuale utente
PluraSens®
Hydrogen Sulfide Detector-Transmitter
E2638-H2S
User Manual
E2638-H2S Rev 21.06.2021
Table of contents
Hydrogen Sulfide 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
Correct and incorrect cabling for 24 VAC 12
Operation 13
Maintenance 13
Calibration 13
Delivery set 14
Order code for E2638-H2S 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
E2638-H2S Rev 21.06.2021
Hydrogen Sulfide
Colorless toxic, corrosive and flammable gas with a smell of rotten eggs. Occurs in natural
gas, volcanic gases, petroleum, and some sources of well water. It results from the
anaerobic decay of sulfur-containing proteins, e.g. in sewers.
Synonyms: Hydrosulfuric acid, Sewer gas, Sulfuretted hydrogen.
Chemical formula
H2S
Molar weight
34
Conversion
1 ppm = 1.40 mg/m3
Relative gas density (to air)
1.17
Boiling point
−60 °C
Low explosive limit (LEL), % vol. in air
4.0
Upper explosive limit (UEL), % vol. in air
44.0
Odor
The characteristic smell of rotten eggs. Above 30 ppm,
the odor is described as sweet or sickeningly sweet.
Odor threshold
0.01-1.5 ppm
Note: Sense of smell becomes rapidly fatigued and can
NOT be relied upon to warn of the continuous presence of
H2S.
Hazards
Highly flammable, explosive gas.
Broad-spectrum poison, mostly affecting the nervous
system. At low concentrations causes eye irritation, a sore
throat and cough, nausea, shortness of breath, and
pulmonary edema. Long-term, low-level exposure results
in fatigue, loss of appetite, headache, poor memory,
irritability, and dizziness. Exposure to high levels can
induce immediate collapse, with loss of breathing and a
high probability of death.
Exposure limits
(Commission
Directive
2009/161/EU)
TWA
7 mg/mm3/ 5 ppm
STEL
14 mg/mm3/ 10 ppm
IDLH (NIOSH)
140 mg/mm3/ 100 ppm
Conversion of ppm to mg/m3is calculated for 25°C and 1 atm.
3
E2638-H2S Rev 21.06.2021
Specifications
Sensor type
Electrochemical cell
Sampling method
Diffusion
Typical detection range
0...100 ppm
0...2000 ppm
Maximum overload
500 ppm
4000 ppm
Resolution / digital unit
0.1 ppm
1 ppm
Response time T90
< 30 s
< 25 s
Operating temperature
-30...+50 °C
-40...+50 °C
Sensor lifetime
> 2 years
Calibration interval
6 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
Enclosure
Grey ABS, wall mount, protection class IP65
Dimensions
H90 × W145 × D55 mm
(overall dimensions H140 × W145 × D55 mm)
Outputs assignment
OUT1 gas; OUT2 gas
NOTE! for the LCD version only output 1 is available
Output scale width
> 10 × resolution
Recommended: 20-100% of the detection range
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
(operating temperature is specified above)
15...90% RH Non-condensing, 0,9...1,1 atm
Explosion-safe areas,
Non-aggressive atmosphere
4
E2638-H2S Rev 21.06.2021
Relay option
Output relays
2 × SPST relays (closing contact),
250 VAC / 30 VDC, 5 A max
Default alarm setpoints
(set/release)
LOW: 10 ppm/ 8 ppm
HIGH: 20ppm/16 ppm
Determined by user
within 5-95% of the range
Signaling 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
5
E2638-H2S 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.
6
E2638-H2S 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.),
●Hydrogen sulfide is slightly heavier than air and spreads evenly in the room. The
recommended location is close to 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 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).
7
E2638-H2S Rev 21.06.2021
Mounting dimensions
Front view
Bottom view
8
E2638-H2S 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 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.
9
E2638-H2S Rev 21.06.2021
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.
Version with PSU and relays Version with PSU and without relays
Version without PSU and with relays Version without PSU and relays
10
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