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8.2.1
Connection of gas detector to a control unit
Detectors must be connected to a control unit by means of three-core cables. The recommended total
resistance of all supplying cables should not exceed 7 Ω (3.5 Ω per a single core). The connection can be
made by means of any cable that meets the foregoing condition, but due to simplicity of installation it is
recommended to use cables with as small cross-sections as possible, e.g. 3 x 0.5 mm
2
.
Maximum resistance
of a single core [Ω]
Cross-section of a single core
[mm
2
]
Maximum cable length
[m]
7
0.5
75
1
150
1.5
250
2.5
450
Table 11: Selection of cables for connections between gas detectors and a control unit
8.2.2
Connection of warning device
The EcoAlpa5 Control Unit is furnished with two identical outputs, connected in parallel and designed for
connection of sound and light warning devices.
Such warning devices must be connected to a control unit by means of a three-core cable.
8.2.3
Connection of the ZMZ module to a control unit
The ZMZ module must be connected to the control unit by means of a three-core cable so that the total
resistance of the cable is less or equal 2 Ω (1 Ω per a single core). The table below presents how to select
cross section of cables corresponding to the cable length.
Cross-section of a single core
[mm
2
]
Maximum cable length
[m]
1.0
50
1.5
80
2.5
130
Table 12: Selection of cables for connections between a ZMZ and a control unit
8.2.4
Valve connection
Designers of the wiring for connection of the valve controller to the shutoff valve must pay particular
attention to appropriate selection of cables so that the maximum permissible resistance allowed for
connection line is not exceeded: 0.2 Ω for valves with power ≤ 72 W or 0.5 Ω for valves with power ≤ 36 W.
s. 20|25
User Manual: POD-057-ENG R01
Summary of Contents for EcoAlpa5
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