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2 Powering the ERX 350
The graphic below shows an alkaline battery pack connected. The ERX 350 I/O Board is on the right.
Note the twin connector (two connector pair) provided for the battery connection. Only one is being used
in this photo.
2.2 External Supply Power Units
The Connections are made at TB1 connector on the ERX 350 I/O Board.
2.2.1 Specifications for external power supply
The input voltage range for using an externally supplied DC power source is +5.0 to +15.0 VDC.
The Honeywell power 9 VDC, 400 mA power pack (p/n: 40-2291) can be used as an external
power source
Connections for the external supply are made at connector TB1 on the ERX 350 I/O Board.
Terminal-1 of TB1 closest to the top of the I/O Board is negative (-) and Terminal-3 is positive
(+) input. These Battery Packs can be connected to the I/O board using cable p/n: 40-6045.
A backup battery pack may also be installed to keep power on the instrument in situations
where the external power is interrupted.
Notice: for Class 1, Div. 2 compliant installations, only the following Battery Packs are
approved:
40-6048 (2-cell Lithium)
40-6050 (4-cell Alkaline)
40-6064 (4-cell Alkaline with 47 ohm Res).
Configure the External Supply Low Alarm Limit (Item 795) to a value of 5.0 to 7.0 volts. Note
that the default value of Item 795 is set to -1.0 to effectively disable the Alarm Item 796 when
external supply is not being used.
Figure 2-3: Alkaline Battery Pack Connected
Honeywell
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