Evikon E2611-HFC Refrigerant Detector Transmitter User Manual

Evikon E2611-HFC Refrigerant Detector Transmitter

Hydrofluorocarbons

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

Classification of halocarbon refrigerants

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).

Properties of selected halocarbons

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

Specifications

Detected gases| R-12, R-123, R-125, R-134a, R-143, R-22, R-404a, R-407c, R-410a etc
---|---
Calibration| R404a
Sampling method| Diffusion
Sensor type| Metal-oxide semiconductor
Detection range| 0…1000 ppm
Resolution| 1 ppm
Response time| <120 seconds
Sensor lifetime| >5 years
Calibration interval| 12 months
Power supply| 12…36 VDC (default), 24 VAC or 230 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
Cable connections| Screwless spring-loaded terminals
Relay outputs| 2 × SPST, max 5 A, 30 VDC / 250 VAC

Default alarm set-points

| LOW: set 100 , release 80 ppm; HIGH: set 500, release 400 ppm
Alarm| Buzzer 85 dB
Enclosure| ABS plastic with ventilation slots, wall-mount, IP20
Dimensions| 85 × 85 × 37 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

| -30…+60 °C

<95 %RH, without condensation, non-ATEX Normal ambient oxygen level Avoid strong mechanical shock, vibrations or EMI, Avoid exposure to corrosive gases or silicone-containing products.

Product description

• E2611-HFC is intended for early detection of leakages or accumulation of halocarbon refrigerants in confined spaces. The instrument is based on a fully calibrated and temperature compensated semiconductor metal-oxide gas sensor with high repeatability, stability and long lifetime.
• E2611 series devices provide two independent analog outputs OUT1 and OUT2, user-selectable to 4-20 mA or 0-10 V, proportional to the gas concentration. RS485
• Modbus RTU digital communication interface allows easy instrument configuration and integration into various automation systems. Two relays RE1 and RE2 with closing contacts can be used to switch 24 V or 230 V powered alarm sirens, ventilation fans, shut-off valves, or other actuators. The device is equipped with an acoustic alarm.

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 installation and 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.

Operating conditions

The device should be used in a non-hazardous (non-ATEX -rated) indoor area without aggressive gases in the atmosphere at the atmospheric pressure (85…110 kPa), <95 %RH, without condensation, and in a basic electromagnetic environment, where the latter is defined in EN 61326-1. Metal oxide semiconductor gas sensors cannot properly operate in a zero or low oxygen content atmosphere. Normal ambient oxygen concentration is recommended. Avoid strong mechanical shock and vibrations. Avoid 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.
Do not use the detectors in the rooms where silicone containing materials (silicone rubber/putty, hair grooming materials, adhesives) or other volatile silicon compounds may be present. Adsorbed silicon-containing vapours may coat the sensing material of the sensor or clog the gas diffusion route, irreversibly inhibiting sensitivity.

Installation guidelines

There are no precise rules or standards to follow when installing gas detectors. The following points must be taken into account

• 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.

1. The aforementioned conditions above will affect the coverage area of the device. however, the coverage area for a detector is usually between 2.5 to 5 meters radius.
2. 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.
3. For general area monitoring without definite leakage sources, the detector should be distributed evenly in the room.
4. Do not locate the detector close to ventilation openings and strong air currents. Avoid the areas without air circulation (corners, niches) as well.
5. 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.

Installation and connections

1. Detach the base of the enclosure by gently pulling along four guiding pins.
2. Attach the base to the wall with two screws (see drawings below).

3. Connect the power supply and external devices to the terminal blocks on the PCB according to the connection diagram below
   J u m p e r s

   J1| OUT1 type (open: 4-20 mA; closed 0-10 V)
   J2| OUT2 type (open: 4-20 mA; closed 0-10 V)
   X6| Reset Modbus network parameters to default
   X4 terminals
   OUT1| 4-20 mA / 0-10 V output
   OUT2| 4-20 mA / 0-10 V output
   0V| 0 V / 24 VAC Neutral (optional)
   A| RS485 A / Data +
   B| RS485 B / Data –
   +U| +24 VDC / 24 VAC Phase (optional)
   X5 terminals (optional)
   L| 90…265 VAC Phase
   N| 90…265 VAC Neutral
   RE1 NO| Relay 1, normally open terminal
   RE1 COM| Relay 1, common terminal
   RE2 NO| Relay 2, normally open terminal
   RE2 COM| Relay 2, common terminal

To power the instrument from an external 24 V power source, connect terminals 0 V and+U to the source. If an integrated mains power supply module is used, connect terminals L and N to the mains.
NOTE! If the instrument is powered from mains, connect to 0 V and +U terminals only light external loads, which consume less than 30 mA in total, as the integrated mains supply module capacity is limited.
To use analog outputs, connect the terminals OUT1 and/or OUT2 and 0 V to the input of the secondary instrument (indicator or controller).
NOTE! The outputs are not galvanically isolated from the 24 V power supply and share a common 0 V. Allowed load resistance limits are stated in the Specifications table.
The type of each analog output can be independently changed between 4-20 mA and 0-10 V with jumpers J1 (OUT1) and J2 (OUT2). With a closed jumper, the output is 0-10 V, with an open jumper the output is 4-20 mA. By default, both outputs OUT1 and OUT2 are assigned to the gas concentration. The output assignments and scales can be changed by Modbus commands.
To use relay outputs, connect the chosen actuators to the relay terminals RE1 and/or RE2.
NOTE! Actuator short-circuits shall be avoided, to protect the instrument relays using external fuses or safety switches.

4. Turn on the power. It may take up to five minutes after switching on for the sensor to stabilize. During this period relays, analog outputs, and Modbus interface are off. A LED placed on the PCB of the device allows controlling the connection process. The LED response to different processes is presented in the table below:
   Mode| LED mode
   ---|---
   During calibration mode or sensor heating period (if activated)|

0.5 Hz (50% on, 50% off)

Relay 1 turned on| Blinking 1 Hz (50% on, 50% off)
Relay 2 turned on| Blinking 2 Hz (50% on, 50% off)
During the Modbus communication cycle| Short on-off pulses
Normal operating/measurement| Continuously on or off

NOTE! Pulse corresponding to Modbus response is visible only when diode light is on.

5. Push the enclosure to the base.

Correct and incorrect cabling for 24 VAC

Operation

For best stability, the gas detector should be powered permanently. If the instrument is left for a long time in an unpowered state, then after initial power-on the metal-oxide gas sensor needs some time to heat up and burn adsorbed contaminants. So for the first tens of seconds of a few minutes, an alarm activation may be possible. After this heating-up period, the instrument turns into normal mode. When the concentration of the detected gas reaches the LOW alarm level, the control LED starts blinking and the buzzer starts beeping with 1 Hz frequency. When the HI alarm level is reached, the frequency of blinking/beeping is 2 Hz. The alarm signal turns off automatically if gas concentration decreases to 80% of the alarm setpoint.

Maintenance

• Do not perform any maintenance operation with the power on.
• Clean the device with a soft damp cloth. Do not use any abrasive cleaning agents. Do not immerse the device in water or any cleaning media.

Calibration

E2611-HFC has been calibrated by the Manufacturer with standard gas mixtures before delivery. The semiconductor gas sensor exhibits high stability and > 5 years’ lifetime. However, as the gas sensor is directly exposed to the environment, the instrument requires at least annual field recalibration with a portable calibration kit.

Delivery set

• Combustible Gas Detector E2611-HFC
• Mounting accessories:
  • 2 screws and 2 plastic dowel plugs

Order code for E2611-HFC options

Configuring

Gas detector E2611 shares all functionalities of the PluraSens® multifunctional transmitter platform. The features and options include:

• Digital output change rate limiting filter
• Digital integrating (averaging) filter
• Free assignment of each analog output to chosen parameter
• Flexible setting of analog output scales for each output
• Output zero and slope adjustment for calibration
• Free assignment of each of two relays to chosen parameter
• Several relay control logic modes (HI or LO with hysteresis, U or П)
• Switch delays and minimum on/off state durations for each relay
• Modbus controlled forced state options for analog outputs and relays.

E2611 can be configured through its RS485 interface by Modbus RTU commands. A standard configuration kit includes a USB-RS485 converter and Configurator software. Please contact your Seller or the Manufacturer for more information.

Return to default settings

To reset the device’s Slave ID, baud rate, and stop bit numbers to factory settings, proceed as follows:

1. De-energize the device
2. Connect the X6 jumper
3. Turn on the device
4. De-energize the device
5. Disconnect the X6 jumper
6. Turn on the device

RS485 communication interface

• Databits: 8
• Parity: none
• Stop bits: 1 or 2 Protocol: Modbus RTU
• Supported Modbus functions:
• 03 Read multiple registers
• 06 Write a single register

Modbus registers (0-based, decimal format)

the new value is applied after restart,
Broadcast ID =0 may be used to assign a new ID to a device with an unknown ID

Factory settings

Warranty

This product is warranted to be free from defects in material and workmanship for a period of one year from the date of the original sale. During this warranty period, the Manufacturer will, at its option, either repair or replace a product that proves to be defective. This warranty is void if the product has been operated in conditions outside ranges specified by the Manufacturer or damaged by customer error or negligence or if there has been an unauthorized modification.

Manufacturer contacts

Evikon MCI OÜ Teaduspargi 7/9, Tartu 50411 Estonia
info@evikon.eu
www.evikon.eu

References

• Home | Evikon MCI OÃœ

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