820-0003
IPES IR3 Flame Detector
Operating Manual
Page
17
of
37
Earth Grounding
The enclosure of the IPES
‐
IR3 must be earthed/grounded for electrical safety and to limit the effects of radio
frequency interference. An earth/ground point is provided on the outside of the IPES
‐
IR3 Explosion Proof
enclosure.
Use 14 AWG copper (Stranded, or Solid), wire.
Loosen the nut sufficiently to enable wrapping of the wire or wire terminated with a crimped lug around the
thread in a “U” shape. Raise the flat and lock washers and position the wire between the 2 flat washers and
ground base.
*Note: Earth and System Grounds are separated to prevent ground loop potential plus maintain signal and
current output integrity
Power Cable Conductor Size affects Cable Length
The IPES
‐
IR3 detector must receive a nominal voltage of 24 VDC (+/
‐
8VDC) to operate properly. Wire size
requirements are dependent upon power supply voltage and wire length.
There are several possible methods to electrically connect an IPES
‐
IR3 that are determined by
each user’s
application.
These can run from a single IPES
‐
IR3 running on 24VDC that is operating as an isolated device and is connected
directly to a warning system of alarms and/or lights to a network of devices that are connected in series that can
provide any mix of RS
‐
485 Modbus, +4 to 20 am, and relays to separate devices.
22 AWG 0.326mm
2
)
40.5Ω
750
2460
20 AWG 0.518mm
2
)
40.8
1200
3936
18 AWG 0.823mm
2
)
40.7Ω
1900
6232
16 AWG (1.31mm
2
)
40.2Ω
3000
9840
