ENGLISH
Pag. 28
Table 3) Functional properties when the pin 5-6 of JP9 jumper is in open or closed position
Properties
Pin 5-6 open
Pin 5-6 closed
4-20 mA output as per default configuration
Fault 2 mA
Underscale 3 mA (required for the connection of
gas detectors to MU+ control panels)
- -
YES
Analog 4-20 mA
Fault 2 mA
Overrange 21 mA
Connection to optional boards
LED visualization on display board
YES
- -
5.7 Connection with 4-20 mA output
The detector is configured to have a 4-20 mA proportional output by default. For the con-
nection of the detector with the control unit and the power supply it is recommended:
³
The use of shielded cable conforming to EN 60332 standard.
³
The cross section of the cable to be used depends on the distance of the detector from
the control unit: for distances of less than 100 m, use a 3-core wire with a cross section
of 0.75 mm2; for distances between 100 and 200 m, use a 3-core wire with a cross
section of 1.0 mm2; for distances between 200 and 300 meters use a 3-core wire with
a cross section of 1.5 mm2.
³
Should any junctions be necessary on wires, please make sure there is no interruption
on the shield.
³
Please remember that the shield is to be grounded from the control panel side only.
Also remember never to connect the shield to the detectors.
³
Ensure the wire connections, either clutching or crimping type, are properly carried
out with terminals that do not oxidize or loosen over time. We always recommend
having them soldered.
³
The SMART3G-GrI detectors can be connected to gas detection panels of other brands,
as long as they can read a 4-20 mA signal.
³
It is recommended to ensure that the control units are certified in compliance with the
EN60079-29-1: 2016 standards.
Figure 2 shows the connection of a SMART3G-GrI detector to a control panel. Control panels
accepting 4-20 mA input signals allow the connection of only one detector per input.
Summary of Contents for SMART3G-GrI
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