Sensitron PL4 +D - Introduction

MT4412E Rev.2 15/10/2019 Pagina 5 di 30
1) INTRODUCTION
The highly innovative and versatile PL4 +D gas unit is the ideal solution for small systems with
up to 16 gas detectors.
The system provides for the direct connection of 4 detectors to the gas unit (4-20mA) and to
additional 8 detectors that can be connected directly to the RS485 bus or via a remote module
with 8 x STG/IN8-S inputs (optional).
Each input can be configured for different types of gas: toxic, refrigerant, flammable, and
oxygen, both for their deficiency and enrichment.
The backlit display offers an accurate indication of gas concentration and allows the display of
established alarm levels.
The gas control unit manages up to 21 relay outputs, of which 5 are on board the gas control
unit and the other 16 are via STG/OUT16S and STG/8REL cards (optional).
The housing of gas control unit is a plastic box 9 DIN module. A further plastic box, 12 DIN
module can be supplied as optional.
The gas control unit power is 24Vdc (power sully available on request).
The PL4 +D is SIL1 and ATEX certified pursuant to EN60079-29-1.
158,50 mm
9
0
,
0
0
m
m
4
5
,
0
0
m
m
60,00 mm
Fig. 1.) Gas control unit PL4 +D and its dimensions
Overview of devices connectable to the PL4 +D gas control unit.
Gas control model
N. serial bus
RS485
N. max
detectors
N. max
outputs
ST.G/IN8
N. max
modules
ST.G/OUT16
N. max
modules
Notes
PL4 +D
1
4+8(*)
5+16(*)
1
1
(*) available through additional modules
Other features of the PL4 +D, gas control unit are:
• Event log can be displayed on the screen or downloaded to a PC.
• USB port for PC connection for programming and control via specific software.