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Name: Interface / Ex barrier
Type: INT-S3 | INT-S3/N
Installation manual
Document issue: 3.1 / 06-2023
Implicitly read the user manual, which contain all necessary information about
appliance, including safety information. This is only a supporting document, which
includes only selected information, useful during device installation. Installation
manual is only an annex to the main document.
User manual along with information regarding safety and a template of EU conformity
declaration is available on website https://gas.plummac.com/en/ after logging into your
Client Panel (link in QR code) under INT-S3 section.
SAFETY
INT-S3 and INT-S3/N are partially intrinsically safe, explosion proof devices and it can be installed only
outside of hazardous explosion zone of gases and vapors. Ex marking II (2)G [Ex ib Gb] IIA. Devices are
designed to cooperate with device installed inside explosion hazard areas and its installation must comply
with requirements of applicable regulations.
Installation of intrinsically safe circuits must fulfill requirements of standard EN 60079-25:2010.
Grounding of the interface – terminal no. 3 connect to earth bar in telemetric cabinet using wire minimum
1,5mm
2
cross-section. In case of possibility of appearing more than 30V voltage in circuits, terminal no. 9
connect to earth grounding using wire minimum 4mm
2
cross-section.
Ex cables must be passed separately to the non-Ex cables. Wiring must meet the requirements of EN 60079-
14 ch. 12.2.2.8: wires insulation should withstand 500V DC attempt voltage, and it can not be thinner than
0,1mm (for polyethylene insulation 0,2mm).
Wires and cables of Ex circuits should be rigidly placed and secured from mechanical factors.
LIYCY type cables for intrinsically safe circuits are highly reccomended. Option for usage in intrinsically safe
circuits – blue insulation.
Permissible cable lengths: RS485 Ex – 150m for LIYCY 6x0,5mm
2
or 100m for LIYCY 6x0,34mm
2
Shielding of RS485 Ex cable connect to the SHIELD terminal, and the earth grounding. INT-S3 shielding has
to be separated from housing of connected EVC or other devices, to prevent grounding loops appearing.
For longer than 30 meters connections it is reccomended to ground the shield cable using surge protection
device placed as close as possible to connected device, but not inside the explosive hazardous zone.
Do not install the interface in vincinity of strong electrical or magnetic fields.
TECHNICAL PARAMETERS
Ex marking II (2)G [Ex ib Gb] IIA
Data
transmission
Intrinsically safe circuits – RS485 Ex
Standard circuits – RS485
Baud rate 9600 - 115200b/s or 1200 – 4800b/s
Housing
protection class
IP40
Signals
separation
Z1, Z2 terminals – intrinsically safe circuits –
marked with blue
Z3, Z4 terminals – standard circuits – marked
with black
Input voltage 10,5÷30V DC Assembly DIN rail (TS35)
Output voltage
INT-S3: U
OUT
=~5,7V
INT-S3/N U
OUT
=~7,6V
Inputs /
Outputs
Two separated digital inputs/outputs
Outputs are OC type, maximum load – up to
200mA
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