PluraSens E2611-CH4 Methane Detector Transmitter User Manual

: June 4, 2024
: PluraSens

PluraSens E2611 CH4 Methane Detector Transmitter Methane Detector-Transmitter
E2611-CH4
User Manual
E2611-CH4 **Rev 28.07.2022**

Methane

Colorless ﬂammable gas, widely used as a fuel.
Synonyms: Marsh Gas, Natural Gas, Carbon tetrahydride, Hydrogen carbide

Chemical formula	CH4
Molar weight	16
Relative gas density (to air)	0.55
Conversion	1 ppm = 0.65 mg/m3
Boiling point	−161.49 °C
Low explosive limit (LEL), % vol. in air	5.0
Upper explosive limit (UEL), % vol. in air	15
Odor	Odorless when pure. Methane used in the kitchens contains an odorant
Hazards	Highly ﬂammable, mixtures with air are explosive. Asphyxiant.
Exposure limits	not established

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

Speciﬁcations

Sampling method	Diffusion
Sensor type	Metal Oxide Semiconductor
Detection range	Up to 100% LEL
Resolution	0,1% LEL
Response time	~ 60 seconds
Sensor lifetime	>5 years
Calibration interval	12 months
Operating temperature	-40…+70 °C
**** 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 20, release 16% LEL HIGH set 50, release 40%LEL
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| (operating temperature is mentioned above.) <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

Methane detector-transmitter E2611-CH4 is intended for early detection of leakages or accumulation of methane in indoor spaces. The instrument is based on a fully calibrated
and temperature-compensated semiconductor metal-oxide (MOS) gas sensor with high repeatability, stability, and a long lifetime. The sensor exhibits high sensitivity and selectivity
to methane.
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 ratings 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 at the atmospheric pressure ±10%, <95 %RH, without condensation, and in a basic electromagnetic environment, where the latter is deﬁned in EN 61326-1. Metal- oxide 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 corrosive atmospheres (H2S, SO2, HCl, Cl2, etc) 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

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 the velocity of airﬂows, etc.),
Methane is lighter than air, so the gas detector transmitter should be placed higher than the potential leakage or formation source or on the ceiling.
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 detector 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 detector should be distributed evenly in the room.
Do not locate the detector close to ventilation openings and strong air currents. Avoid the areas without air circulation (corners, niches) as well.
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

Detach the base of the enclosure by gently pulling along four guiding pins.
Attach the base to the wall with two screws (see drawings below).
Connect the power supply and external devices to the terminal blocks on the PCB according to the connection diagram below.
Jumpers

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 use external fuses or safety switches.

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 the Modbus response is visible only when the diode light is on.

Push the enclosure to the base.

Correct and incorrect cabling for 24 VAC PluraSens E2611 CH4 Methane
Detector Transmitter- cabling

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-CH4 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-CH4
Mounting accessories:
○ 2 screws and 2 plastic dowel plugs

Order code for E2611-CH4 options

E2611 options	Order code
Integrated 90…265 V mains power supply module	E2611-CH4-230
Integrated 24 VAC power supply module	E2611-CH4-24VAC

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 the 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 the 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:

De-energize the device
Connect the X6 jumper
Turn on the device
De-energize the device
Disconnect the X6 jumper
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)

Reg	Description	Supported values
1	Hardware version	Read-only
2	Software version	Read-only
3	Product serial number	Read-only
4	Slave ID (network address)*	1…247, default 1
5	Baud Rate*	1200…57600 baud, default 9600
6	Response delay, ms	1…255 ms, default 10
7	Stop bits*	1 / 2, default 1
17	Restart	Write ‘42330’ for soft restart
162	Temperature shift adjustment	-32000…+32000 T units (0,01 °C)
165	Gas channel shift adjustment	-32000…+32000 gas units, default 0
166	Gas channel slope adjustment	1…65535, default 512
167	Output change rate limit	1…32000 gas units/s, 0=no limit
168	Integrating filter time constant	1…32000 s, 0=no, integrating filter
201	The parameter assigned to OUT1	0=none, 1=T, 2=gas, 9=forced by 203
202	The parameter assigned to OUT2	0=none, 1=T, 2=gas, 9=forced by 204
203	Forced value for OUT1	0…1000 (0.0…100.0% of full scale)
204	Forced value for OUT2	0…1000 (0.0…100.0% of full scale)
211	Parameter assigned to RE1	0=none, 1=T, 2=gas, 9=forced by 213
212	Parameter assigned to RE2	0=none, 1=T, 2=gas, 9=forced by 214
213	Forced state for RE1	0=off, 1=on (relay control by Modbus)
214	Forced state for RE2	0=off, 1=on (relay control by Modbus)
215	Switch delay for RE1	0…1000 s, default 0
216	Switch delay for RE2	0…1000 s, default 0
217	Min on/off time for RE1	0…1000 s, default 0
218	Min on/off time for RE2	0…1000 s, default 0
219	Control logic for relay RE1	0:, 1:4TP, 2:-P I 1 ,3: I •P 1 , 4:43 1

– 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

Gas unit	0,1 % LEL
OUT1 assignment and scale	2: gas, 0 – 100% LEL
OUT2 assignment and scale	2: gas, 0 – 100% LEL
RE1 assignment and logic	2: gas, 1: on at high values
RE1 HIGH setpoint (set)	20% LEL
RE1 LOW setpoint (release)	16% LEL
RE2 assignment and logic	2: gas, 1: on at high values
RE2 HIGH setpoint (set)	50% LEL
RE2 LOW setpoint (release)	40% LEL

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.