Relay Outputs - Prosense DPX Series User Manual

Detectors should be connected with three-wire 1.5mm
will be increased while distance increase between the panel and detectors. Recommended
cable types per distance are given in table 6:
Cable size
(cross sectional area)
0.5mm2
1.0mm2
1.5mm2
2.0mm2
2.5mm2
Table 5: Typical cable details and maximum distance for cabling
The use of industrial grade, suitably shielded field cable is recommended. The best
practices shown that, screened 3 cores (plus screen 90% coverage), suitably mechanically
protected copper cable with a suitable explosion-proof gland, or ¾" NPT steel conduit,
depending on the distance between signal received or control panel and detector 0.5 to 2.5
mm2 (20 to 13 AWG) conductors can give better results. Ensure the cable gland is installed
correctly and fully tightened.

5.3 Relay Outputs

DPX Series Gas Control Panel without any optional relay modules has five relay outputs
which are FAULT, ALARM1, ALARM2, ALARM3 and OVERRANGE. The connection ports are
marked on mainboard.
NO/NC setting pins
Relay contacts can be adjusted as normally Open or Normally Close. Mainboard has 3 pins
for each relay to select relay contact mode via changing the jumper position:
NC : Normally closed contact pin (Select by jumper under relay)
NO : Normally open pin (Select by jumper under relay)
PRS-UM-DP-X-EN-Rev1.0-17.11.2021
Cable type
nearest equivalent
20AWG
17AWG
16AWG
14AWG
13AWG
Diagram 12: Relay Outputs
2
cross section cable. Cable diameter
Cable resistance
Maximum Cable length (L)
Ω/km
36.8 Ω/km
19.5 Ω/km
12.7 Ω/km
10.1 Ω/km
8.0 Ω/km
Meters
400
750
1000
1250
1500
14