Evikon PluraSens E2638 Series Bedienungsanleitung



PluraSens®



Hydrogen Sulfide Detector-Transmitter

E2638-H2S

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User Manual

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E2638-H2S Rev 10.03.2021
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
Operation 12
Maintenance 12
Calibration 12
Delivery set 13
Order code for E2638-H2S options 13
Configuring 14
Return to default settings 14
Modbus RTU Communication 15
RS485 communication interface 15
Communication parameters 15
Modbus holding registers 15
Warranty 20
Manufacturer contacts 20
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2

E2638-H2S Rev 10.03.2021

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.



Conversion of ppm to mg/m3 is calculated for 25°C and 1 atm.



 

3

Chemical formula

H2S

Molar weight

34

Conversion

1 ppm = 1.40 mg/m3

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

H2S.

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/mm3 / 5 ppm

STEL

14 mg/mm3 / 10 ppm

IDLH (NIOSH)

140 mg/mm3 / 100 ppm

E2638-H2S Rev 10.03.2021

Specifications

4

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

RL < (Us - 2 V) / 22 mA for 4-20 mA

RL > 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

E2638-H2S Rev 10.03.2021



5

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

E2638-H2S Rev 10.03.2021

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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6

E2638-H2S Rev 10.03.2021

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).

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7

E2638-H2S Rev 10.03.2021

Mounting dimensions



Front view



Bottom view



8

E2638-H2S Rev 10.03.2021

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 10.03.2021

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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