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.
Figure 2-3: Alkaline Battery Pack Connected
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.
2 Powering the ERX 350
Honeywell
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