www.atestgaz.pl
Guidelines to the cabling of the system with an
RS-485 interface
1
Introductory
It is recommended that all system components are made according to the design created by
person with the necessary skills and competence.
2
Connection cable
The data transmission line for the gas detectors working in the RS-485 standard should be
performed only with the use of a shielded twisted pair cable.
In the case where project does not specify this, you can use the following types of shielded cables
connecting gas detectors:
An example of a cable symbol
Approximate outer
diameter [mm]
Outdoor installations
Indoor installations
YvKSLYekw-P 300 / 300 V 2x2x1
YKSLYekw-P 300/300 V 2x2x1
8.9
-
LiYCY-P 300 / 500 V 2x2x1
9.5
YvKSLYekw-P 300 / 300 V 2x2x1,5
YKSLYekw-P 300/300 V 2x2x1,5
10.8
-
LiYCY-P 300 / 500 V 2x2x1,5
11.7
It is recommended to:
use cables with a more accurate, round cross-section, made with the use of pressure (better sealing
in the Ex glands).
3
Power source
The power supply line should be designed in such a way that, at the lowest expected supply
voltage the measured voltage at the gas detector terminals does not drop below the
permissible value.
On the side of the power source, the least favourable conditions should be considered. It must be assumed
that in failure situation – at the time of power failure – the supply voltage from the battery terminals falls
below the nominal value. Please refer to the documentation concerning the uninterrupted power supply
(typical minimum supply voltage during operation on an emergency power supply battery is 21 V; below this
value the system disconnects).
1
Different types of insulation may be needed for different locations – e.g. oils, solvents, high temperatures, etc.
Atest-Gaz
A. M. Pachole sp. j.
ul. Spokojna 3, 44-109 Gliwice, Poland
VAT No.: PL 9691433231
tel.: +48 32 238 87 94
fax: +48 32 234 92 71
e-mail: [email protected]
p. 1/2
Appendix: PU-Z-003-ENG R03
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