Combustible Gases Detector-Transmitter E2611-LEL
is fintended for early
detection of leakages or accumulation of light hydrocarbon gases (acetylene,
methane, propane, butane) and hydrogen.
The instrument is based on fully calibrated and temperature compensated
semiconductor metal-oxide (MOS) gas sensor with high repeatability, stability and
long lifetime. Pellistor (catalytic bead) sensor is available as an option.
E2611 series devices provide two independent analog outputs OUT1 and OUT2,
user-selectable to 4-20 mA or 0-10 V, proportional either to gas concentration or
temperature. 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.
Safety requirements
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.
Operating conditions
•
The device should be used in explosion-safe (non ATEX -rated) indoor areas at
the atmospheric pressure ±10%, <95 %RH, without condensation, and temperature
within the range -30...+70 °C for MOS-type devices / -20...+60 °C for pellistor type.
•
Metal-oxide and pellistor sensors cannot properly operate in a zero or low oxygen
content atmosphere. Normal ambient oxygen concentration is recommended.
•
Avoid exposure to highly corrosive gases (H
2
S, SO
2
, HCl, Cl
2
etc), and volatile
silicone containing materials.
•
Avoid mechanical shock or strong vibrations.
•
Avoid sources of electromagnetic interference
Installation and connections
The gas detector should be mounted on a wall at a place locatedas close as
possible to a possible gas leakage source and not very close to ventilation
openings, with the sensor pointing downwards. Avoid the areas without air
circulation (corners, niches) as well. To detect gases lighter than air (methane,
hydrogen), install the sensor higher than potential leakage/generation source or
near the ceiling. To detect propane and butane (1.55 and 2.0 of air density
respectively), it is recommended to place the sensor lower than potential gas
sourse. Take into consideraton the temperature of the detected gas, the geometry
of the room under investigation, the direction and speed of air currentsThe device
should be available for maintenance and repair.
To install and connect the device, proceed as follows:
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 dimensional drawing below).
85
37
8
5
63
3. Connect power supply and external devices to the terminal blocks on the PCB
according to the connection diagram below.
Input 1 4-20 mA / 0-10 V
Input 2 4-20 mA / 0-10 V
0V / GND
Controller
OUT1
OUT2
0V
A
B
RS485
+U = 11...30 VDC
L
N
90...265 VAC
RE1
RE2
Fieldbus
S
PSU
24 VDC
+
-
J1 J2
230 VAC
J3
Control LED
To power the instrument from an external 24 VDC 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.
NB!
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).
NB!
The outputs are not galvanically isolated from 24 V power supply and share
common 0 V. Allowed load resistance limits are stated in 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 closed jumper the output is 0-10 V, with open jumper the output is 4-20 mA. By
default both outputs OUT1 and OUT2 are assigned to gas concentration. The
device has built-in temperature sensor which may be tied to any of the outputs. The
output assignments and scales can be changed by Modbus commands.
We recommend to set the difference between the upper and bottom limits of the
output scale not narrower than 20% of detection range. In any case, do not set the
output scale below the tenfold resolution of the device.
To use relay outputs, connect the chosen actuators to the relay terminals RE1
and/or RE2.
NB!
Actuator short-circuits shall be avoided, to protect the instrument relays use
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 to control the connection
process. The LED response to different processes is presented in the table below.
Process
LED mode
Sensor heating period
Blinking 0.5 Hz (50% on, 50% off)
Sensor absence or malfunction
Blinking 0.5Hz (90% off, 10% on)
Relay 1 turned on
Blinking 1 Hz (50% on, 50% off)
Relay 2 turned on
Blinking 2 Hz (50% on, 50% off)
Modbus response
The signal is modulated with short onoff
pulses, even single Modbus cycle is
traceable*
Normal measurement
Continuous light
* Pulse corresponding to Modbus response is visible only when diode light is on
5. Push the enclosure to the base.
Operation
For best stability the gas detector should be powered permanently. If the instrument
is left for a long time in unpowered state, then after initial power-on the metal-oxide
gas sensor needs some time to heat up and burn adsorbed contaminants. So for
first tens of seconds of 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.
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
- temperature measurement channel with internal sensor
- free assignment of each analog output to chosen parameter
- flexible setting of analog output scales for each output
- output shift 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 option for analog outputs and relays.
E2611 can be configured through its RS485 interface by Modbus RTU commands.
A standard configuration kit includes Model E1087 USB-RS485 converter and
E26XX Configurator software. Please contact your seller or manufacturer for more
information.
Return to default settings
To reset the device’s Slave ID, baudrate and sbit number to factory settings,
proceed as follows:
1. De-energize the device
2. Connect the J3 jumper
3. Turn on the device
4. De-energize the device
5. Disconnect the J3 jumper
6. Turn on the device
Calibration
E2611-LPG has been calibrated by 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 environment, the
instrument requires at least annual field recalibration with a portable calibration kit.
The catalytic sensor is more sensitive to the environment and requires calibration
every 3...6 months.
The calibration should be performed by trained specialist. Please contact your
dealer for more information.
Warranty
This product is warranted to be free from defects in material and workmanship for a
period of one year from the date of original sale. During this warranty period
Manufacturer will, at its option, either repair or replace product that proves to be
defective. This warranty is void if the product has been operated in conditions
outside ranges specified by Manufacturer or damaged by customer error or
negligence or if there has been an unauthorized modification.
Delivery set
–Combustible Gases Detector-Transmitter E2611-LEL
– Mounting accessories: 2 screws and 2 plastic dowel plugs
