Hydrogen sulfide transmitter E2618-H2S is a member of new PluraSens® family of
multifunctional measurement instruments. Applications include sewerage systems,
labs, industrial premises and other confined spaces where potentially toxic
concentration of hydrogen sulfide can accumulate.
The instrument utilises digital fully calibrated and temperature compensated
electrochemical gas sensor with excellent repeatability, stability and long lifetime.
The transmitter is supplied either in duct-mount or wall-mount version. For the
wall-mount version the range of remote probe options is available.
Two freely configurable 4-20 mA or 0-10 V analog outputs can be used to connect
the transmitter to secondary instruments. RS485 interface with industry-standard
Modbus RTU protocol allows direct Fieldbus networking of the transmitter.
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. Allowed conditions are:
– temperature in the range of -30...+50 °C
– relative humidity in the range of 15...90%
– atmospheric pressure in the range of 80...120 kPa.
Installation and connection
1. Duct mount version: Connect the sensor probe to the device main unit. Make
sure that the connections are tightened properly.
Cut a 25 mm diameter hole in the air duct at the chosen mounting place. Fix the 25
mm cable gland in the hole. Pass the sensor probe through the gland, adjust it to
the appropriate depth and tighten the gland’s screw. Unscrew four lid screws and
detach the lid from the instrument.
Wall mount version: Unscrew four lid screws and detach the lid from the
instrument. Fix the transmitter through mounting holes by screws.
The device should be mounted in proximity to potential H
2
S sources and away
from ventilation holes or dead-air spaces such as corners. Locate the sensor at
30...80 cm from the floor, pointing downwards. Recommended coverage area for
each transmitter is 50..100 m
2
(4...5,5 m radius).
2. Plug the power cable and connect the analog outputs and/or digital interface
terminals to the relevant devices according to the connection diagram.
Make certain that the cable gland is properly tightened to ensure the conformity to
IP65 protection class.
The screwless quick connect spring terminals on the E2618 series devices are
suitable for a wide range of wires with cross-section 0,2...1,5 mm
2
. The
recommended wire stripping length is 8...9 mm. Push the spring loaded terminal
lever, insert the wire end into terminal hole 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.
Place the lid back and tighten it with the four screws.
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 wich may be connected to any of the
outputs.
The output assignments and scales can be changed by Modbus commands.
Sensor probe handling
The wall mount version of the transmitter is available with remote probe (see
drawing for dimentions).
36
77
Ø35...36
Ø50
120°
Ø6
5
80
3
27
Ø34 max
Hole
35
The remote probe is connected to the main unit with shielded cable. The
connection cable length options are 2,5 m or 5 m.
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 round filter is
snap-fitted and may be replaced if it gets strongly contaminated.
To replace the PTFE filter, carefully hook the filter near it’s edge with a small flat
screwdriver and pull it off. Place a new filter onto the sensor opening and press it
to snap into the groove.
NB!
Never stab or press the filter near its center where the sensor is located sinse
this may damage the sensor.
The recommended orientation of sensor probe is vertical with the sensor tip
pointing downwards. This prevents possible accumulation of condensed water on
the sensor protection filter. The horizontal orientation is also suitable. Avoid upward
position of the sensor tip.
Emergency mode
The current outputs of the transmitter may be programmed via Modbus commands
to signal if the connection with the sensor is lost. The signal may be set to 3,8 mA
or 21,5 mA. See the table of Modbus registers for more information.
4-20 mA / 0-10 V
4-20 mA / 0-10 V
0V / GND
0V
Controller
Power Supply
Input 1
Input 2
OUT1
OUT2
0V
A
B
RS485
+U
J1 J2
Fieldbus
Sensor module
+12 V
J3
Dimensions of the E2618 wall-mount version
Dimensions of the E2618 duct mount version
Ø4 mm
55
80
13
0
82
50
70
55
11
5
M16
82
80
Ø16
