3.7 Power Supply Options
The EC350 has flexible power supply options. The unit can operate from an externally supplied DC power
source or from a 4-cell Alkaline, a 2-cell Lithium, or dual 2-cell Lithium Battery Packs.
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External Power Supply
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Battery Powered
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Battery Life/ Usage Tracking
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Replacing the Battery Pack
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Low battery/ External Power shutdown mode
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User Shelf/ Shutdown mode
3.7.1 External Power Supply
The input voltage range for using an externally supplied DC power source is +5.0 VDC to +15.0 VDC. The
Honeywell power 9 VDC pack p/n: 40-2291 can be used as an external voltage source.
Connections for the external supply are made at the TB1 connector on the EC350 IO Board. Terminal-1
nearest the top of the IO Board is GND and Terminal-3 is the positive (+) input. When operating from an
externally supplied DC power source, a backup battery pack may also be installed with the intent of
powering the instrument in situations where the external (remote) power is interrupted.
Installations requiring CLASS 1 - DIV 2 approval, the following Battery Packs are approved: 40-6048 (2-
cell Lithium), 40-6050 (4-cell Alkaline), and 40-6064 (4-cell Alkaline with 47 ohm Res). These Battery
Packs can be connected to the P5 Battery connector using cable p/n: 40-6045.
Note: -> In a non-hazardous (safe) area, the battery packs such as 40-6050, 40-6054, or 40-6064
must be used.
- These battery packs have cells that can be replaced, but only in a non-hazardous (safe) area.
- In these battery packs, only Duracell MN1300 non-rechargeable cells are to be used.
-> In a hazardous area, battery pack 40-6048 must be used.
Installations requiring CLASS 1 - DIV 1 approval, only the Battery Pack 40-6064 is approved.
When operating from an externally supplied DC power source, configure the External Supply Low Alarm
Limit (Item 795) to be a value greater than 5.0 and generally less than 7.0 V. The default value of Item 795
is -1.0 to effectively disable the Alarm Item 796. The External Supply voltage is measured on a 10 minute
interval. Three consecutively low readings are required to the trip the Low Voltage Alarm (Item 796) – this
is done to help guard against falsely setting alarm due to a power supply glitch.
3 EC350 installation
3.7 Power Supply Options
Honeywell 2024
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