EsiWelma Srl
URD40SE - EW0526D1_en.docx
CO
2
gas detectors – URD40SE
16/06/2017
Gas detection systems for industrial environments
3/4
Installation
The relative density of carbon dioxide is about one and a half times that of air, so it
tends to collect at floor level in closed, unventilated environments.
Therefore, the sensor must be installed about 30 cm above the floor level.
Take into consideration the following specific installation guidelines, as well as the
above instructions, for location of the detectors.
The detectors must be installed:
1. where accidental gas leakages are possible
2. at least 1.5m away from heat sources or from vent holes
3. not in spaces where ventilation is poor and where gas pockets may form
4. away from hindrances to natural gas flow
5. away from equipment that may leak gas during normal operations
6. in environments with a temperature range of -20°C to 50°C and relative
humidity below 90% (non-condensing)
7. Disconnect equipment from the power supply when mounting and dismantling
detectors.
Special
recommendations
CAUTION:
safety is guaranteed only if cover is screwed on tight.
-
Tighten the cover clockwise, and when it is screwed on, make sure that there is
no more than 0.5 mm between housing and cover. This guarantees that it is
screwed on tight. Remember to tighten the hexagon locking grub screw that fits
into the end of the cover
-
Ensure compliance with the words << DO NOT OPEN WHEN ENERGISED >>,
clearly indicated on the cover. Alternatively, make the area safe before opening
the sensor cover.
Electrical installation
and configuration
Terminal board and
electrical connections
Cabling:
CAUTION: Make the area safe and ensure that the device power supply is off
before cabling and configuration operations.
Install the sensor in compliance with EN 60079-14.
ATEX certified 1“ NPT cable glands are used for cable entry, in compliance with
standards EN 60079-0 and EN 60079-1 (Ex d protection mode).
Ground the sensor using the internal grounding system.
Refer to the Control Unit manual for all cabling information (cable type and
specifications, bus topology, length of connections etc.) and configuration.
Depending on the connecting distance, use at least 4-core cable, min. diameter
0.75mm
2
up to 100m, 1mm
2
up to 200m, 1.5mm
2
up to 500m.
Use shielded cable where there is a risk of electromagnetic interference.
12 Vdc power supply
input
BUS input
BUS
Shield
-
+
-
+
BUS
12V
Grounding
connection
Termination
jumper
Configuration key
Cable connection
Status LED
Sensing element
Power supply
and BUS
connector
