E2227
Rev 17.05.2021
Position the transmitter with the ventilation slots upwards and downwards to ensure
proper air convection for faster response and higher accuracy.
Plug the power cable and connect the analog outputs and/or digital interface terminals to
the relevant devices as described below.
E2227 uses screwless quick connect spring terminals 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 the 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 mm2 or CAT 5, to connect the device to the
RS485 network. Use one pair for A and B wires and the second pair for common 0V and
power +U wires. to connect the transmitter to the Fieldbus network. polarity must be
respected when connecting to an external RS485 network. Overall length of all connections
via RS485 interface should not exceed 1200 m.
Note! The outputs are not galvanically isolated from external power supply and share
common 0V. Allowed load resistance limits are stated in the Specifications table. To power
the instrument from an external power source, connect terminals 0V and +U to the source
(see connection diagram).
Both analog outputs can be independently changed between 4-20 mA and 0-10 V type
using jumpers J1 (OUT1) and J2 (OUT2). By closing pins on a specific jumper the related
output is 0-10 V, with an open jumper the output is 4-20 mA. Power restart is required after
changing the position of the jumpers.
By default the output OUT1 is assigned to relative humidity with default scale 0-100 %RH.
By default the output OUT2 is assigned to temperature with default scale 0-100 °C.
After wiring and setting output options attach the enclosure back to the base.
A LED placed on the PCB of the device to control 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)
During Modbus communication cycle
Short on-off pulses
Normal operating/measurement
Continuously on or off
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