Nov. 18
Automatikprodukter
Nitrogen Dioxide, NO
2
Gas Detector - Analogue, Modbus
3
db_nitrogen_transmitter_uk.indd
RNO2
See Installation guidelines section for more information.
Step 1: Wall mount version:
Fix the device on a wall by screws, using cross-shaped mounting lugs
supplied with the instrument (see dimensional drawing below).
Duct mount version:
Cut a 36 mm diameter hole in the air duct at
the chosen mounting place.
Place the rubber flange aligning the holes in the flange and the
air-duct and fix the flange with three self-tapping screws.
Pass the sensor probe through the flange and adjust it to the
appropriate depth.
82
80
M25
� = 28
34
200
55
230
55
80
M16
70
130
50
� = 4
Step 2:
Unscrew four lid screws and detach the lid from the
transmitter.
Use two M16 cable glands to pass the cables of the power supply
and of the external devices.
Plug the power cable and connect the analog outputs and/or digital
interface terminals to the relevant devices according to the connec
-
tion diagram.
Controller
Power
Supply
B
0 V
OUT1
+U
A
Control LED
OUT2
Input 2: 4 - 20 mA / 0 - 10 V
Input 2: 4 - 20 mA / 0 - 10 V
Fieldbus
0V
+24V
0V/GND
J3
SENSOR
J1 J2
J1: OUT1 type (open: 4-20 mA; closed: 0-10 V)
J2: OUT2 type (open: 4-20 mA; closed: 0-10 V)
J3: return to factory settings
The screwless quick connect spring terminals on the RNH3 series
devices are suitable for a wide range of wires with cross-section
0,2...1,5 mm2. 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 dis
-
connect, 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 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 be
-
tween 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 concen
-
tration. 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 com
-
mands.
NOTE If you use a version with LCD, only OUT1 is available.
Step 3:
Turn on the power. The sensor heating up may take up to five
minutes after switching on. During this period relays, analog outputs
and Modbus interface are off.
A LED placed on the PCB of the device allows to control the connec
-
tion process. The LED response to different processes is presented in
the table below.
