Evikon PluraSens E2648-HFC Bedienungsanleitung

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PluraSens®



Refrigerant Detector-Transmitter

E2648-HFC

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User Manual

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E2648-HFC Rev 18.12.2020
Table of contents
Hydrofluorocarbons 3
Specifications 5
Product description 7
Safety requirements 7
Operating conditions 8
Installation guidelines 8
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 E2648-HFC 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

E2648-HFC Rev 18.12.2020

Hydrofluorocarbons

HFCs are relatively non-flammable, chemically stable, and nonreactive.

Classification of halocarbon refrigerants



Properties of selected halocarbons



3

Group

Refrigerants

Chlorofluorocarbons (CFC)

R11, R12

Hydrochlorofluorocarbons

(HCFC)

R22, R141b, R142b

Hydrofluorocarbons (HFC)

R32, R125, R134a, R143a

Hydrofluoroolefins (HFO)

R 1234ez, R1234yf, R1336mzz

Chlorine containing refrigerants (CFC and HCFC) are considered to be damaging to the ozone layer

and contributing to the greenhouse effect. According to the Montreal Protocol, chlorine-containing

halocarbons should be completely dismissed and their manufacturing closed down.

Hydrofluorocarbons (HFC) contain no chlorine and are safer for the environment. Now

hydrofluorocarbons are the most commonly used halocarbon refrigerants.

Hydrofluoroolefins (HFO) is the last generation of refrigerants, more environmentally friendly than

HFCs, but moderately flammable (A2L Class).

Name

Type

Components

Components weight %

Boiling point

R12

CFC

CCl2F2

100

−29.8 °C

R22

CFC

CHClF2

100

−40.8 °C

R125

HFC

CHF2CF3

100

−48.5 °C

R134a

HCFC

CF3CH2F

100

−26.2°C

R143a

HCFC

CF3CH3

100

-47.5 °C

R32

HFC

CH2F2

100

−52 °C

R1234yf

HFO

2,3,3,3-Tetrafluoropropene

100

-30 °C

R1234ze

HFO

1,3,3,3-Tetrafluoropropene

100

-19 °C

R404a

mixture

R125, R143a, R134a

44:52:4

−47.8 °C

R407c

mixture

R32, R125, R134a

23:25:52

−43 °C

R410a

mixture

R32, R125

50:50

−48.5 °C

Overexposure may cause dizziness and loss of concentration. At higher concentrations, CNS

depression and cardiac arrhythmia may result from exposure. Vapors displace air and can cause

E2648-HFC Rev 18.12.2020



 

4

asphyxiation in confined spaces. At higher temperatures (>250°C) decomposition products may

include hydrofluoric acid (HF) and carbonyl halides.

An escape of refrigerant through a leak may damage the refrigerating facilities.

E2648-HFC Rev 18.12.2020

Specifications

5

Sampling method

Diffusion

Sensor type

Standard: Metal oxide semiconductor

NDIR sensor available on demand

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

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

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

Output 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

E2648-HFC Rev 18.12.2020



6

Operating conditions

(MOS sensor)

-30...+70 °C ;

<95% RH non-condensing, 0,9...1,1 atm

Explosion-safe areas

Normal ambient oxygen level

Avoid exposure to corrosive gases or silicon containing products

Relay option

Output relays

2 × SPST relays (closing contact),

250 VAC / 30 VDC, 5 A max

Default alarm setpoints

RE1 (LOW): set 20% LEL; release 16% LEL

RE2 (HIGH): set 50% LEL; release 40% LEL

Other options

Remote probe

Protection IP65, default cable length 3.0 m;

max height 80 mm, max diameter 65 mm

E2648-HFC Rev 18.12.2020

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.



7

E2648-HFC Rev 18.12.2020

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.),

●Halocarbons are heavier than air and tend to sink. The sensor should be placed             

near the floor.

●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.

8

E2648-HFC Rev 18.12.2020

Mounting dimensions



9

E2648-HFC Rev 18.12.2020

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.

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.

NOTE! Metal oxide semiconductor sensors are not replaceable.

10

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