E2648 series heavy duty detectors-transmitters belong to the PluraSens® family of
multifunctional measurement instruments. The instruments utilise gas sensors of
various types with excellent repeatability, stability and long lifetime. Due to its IP66
enclosure of die cast aluminium, 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 either to gas concentration or temperature.
RS485 Modbus RTU digital communication interface allows easy instrument
configuration and integration into various automation systems.
The following features are available as 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) alarm
Integrated 230 V mains power supply module
Remote probe. The remote probe is connected to the main unit with shielded cable.
Default connection cable length is 3 m.
The version of your device is marked on the package.
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, without
aggressive gases in the atmosphere. See Specification table for more details.
Mounting dimensions
Installation
There are no precise rules or standards to follow when installing the gas detectors. The
following points must be taken into account:
application (air quality control or leakage detection),
properties of the space under investigation (room geometry, direction and velocity of
air flows etc),
detected gas (relative density to air, whether the gas is flammable, or toxiс, or oxygen
displacing),
safety: strong vibrations, mechanical shock, and the sources of strong
electromagnetic interference should be avoided,
the device should be accessible for maintenance and repair.
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). Recommended sensor position is vertical, pointing downwards. See
Installation guidelines section for more information.
The device is fixed on the wall using two holes located outside the sealed area of the
device (see dimensional drawing
in the previous section
).
Connections
1. Unscrew four lid screws and detach the lid from the device.
2. Attach the device to the wall. (This step may be done after the step 3, consider
your convenience).
3. Use two M16 cable glands to pass the cables of the power supply and of the external
devices. Attach the power cable to the device without turning it on. Using the
connection diagrams below, connect the analog outputs, digital interface terminals
and/or relays to the relevant devices according to your needs.
The screwless quick connect spring terminals on the E2648 series devices are
suitable for a wide range of wires with cross-section 0,2...1,5 mm
2
. We recommend
to strip the wire end by 8...9 mm and tin it, or to use the wire end sleeves.
To connect the wire, insert the wire end into terminal hole. To disconnect, push the
spring loaded terminal lever, pull the wire out, and release the lever.
Use twisted pair cable, e.g. LiYY TP 2×2×0,5 mm
2
or CAT 5, to connect the device
to RS485 network. Use one pair for A and B wires and the second pair for common
0 V and power +U wires to connect the transmitter to Fieldbus network. Respect
polarity. Overall length of all connections via RS485 interface should not exceed
1200 m.
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 (for CO detectors the scales
down to 5% of range are allowed). In any case, do not set the output scale below
the tenfold resolution of the device.
Note The outputs are not galvanically isolated from 24 V power supply and share
common 0V. Allowed load resistance limits are stated in Specifications table. To power
the instrument from an external 24 VDC source, connect terminals 0V and +U to the
source. If the integrated mains power supply module is used, connect terminals L and N
to the mains.
Note Actuator short-circuits should be avoided, to protect the instrument relays use
external fuses or safety switches.
4. Turn on the power. The sensor heating up may take up to five minutes after
switching on. 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 0.5 Hz (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 on-off pulses,
even single Modbus cycle is traceable*
Normal measurement
Continuous light
5. Make sure that the device is properly installed, the external devices connected,
power on and control LED is constantly lit. Make certain that the cable glands are
properly tightened to ensure the conformity to IP66 protection class. Place the lid
back and fix it with the screws. The device is ready to use.
It is recommended to keep the detector-transmitter powered constantly, except for
periods of maintenance and calibration, deplacement etc.
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
OUT1
OUT2
0V
A
B
+U
J3
J1 J2
Fieldbus
Controller
Supply
Power
Control LED
Input 1 4-20 mA / 0-10 V
Input 4-20 mA / 0-10 V
2
0V / GND
0V
+24V
SENSOR
E2648 basic version
4 -20 mA / 0 -10 V
4 -20 mA / 0 -10 V
0V / GN D
OUT1
OUT2
0 V
A
B
R S48 5
+U = 11...3 0 VD C
RE 1
R E2
Fie ldb us
24 VDC
S
N
L
90 ...2 65 VAC
J 3
Co ntrol L ED
J1 J 2
J1: O UT1 t ype (open: 4-20 mA; closed: 0-10 V)
J : O UT t ype
2
2
(open: 4-20 mA; closed: 0-10 V)
J :
3 return t o fact ory settings
E2648R version with relays
M25 (sensor)
M16 (cable entry)
125
8
0
fixing hole (Ø 5mm)
fixing hole (Ø 5mm)
