This document is strictly private and confidential, reproduction without Micropack approval is prohibited. © Micropack Engineering Ltd, 2018
The following guidelines are intended to assist with the electrical design and engineering of
systems where it is intended that flame detectors will be used
.
4.1 Power Supply
The detector requires an absolute minimum supply voltage of 18Vdc, as measured at the
detector
terminals. The system power supply voltage and power distribution should be
arranged such
that on the longest cable run the detector(s) has a supply voltage of greater than
18Vdc.
4.2 Cable Selection
Cable to be used for installation is to be selected with a temperature rating of greater than 25
degrees Celsius above the maximum ambient temperature.
The metric cable entries are fitted with an internal stop. This internal stop has an IP washer
mounted directly above it. Ensure this is fitted to maintain the ingress protection. This will result
in threads of the cable gland being visible. Do not over tighten.
The installation and local regulations and standards determine the overall cable specification.
This section specifies suitable cable characteristics to ensure correct operation of the flame
detector.
4.2.1 DC Power
NOTE: Table 2 shows an absolute maximum for cable length; try not to approach this value.
DO NOT ground any cable shields at the detector housing.
Table 2: Maximum Cable Lengths (24Vdc supply)
Installation
based on 24V
nominal supply
Number of
Flame Detectors
Maximum Power
(W)
Maximum Cable
Length (m) with
1.5mm2
Conductors
(12Ω/km)
Maximum Cable
Length (m)with
2.5mm2
Conductors
(7.6Ω/km)
Detector 1 12W @ 24Vdc 500 Metres 780 Metres
To Next Page
Loading...