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Section 2 MC-III™ Panel Mount Flow Analyzer
Power Supply Wiring
Internal Power Supply
The MC-III Panel Mount is shipped with a 3.6-V lithium battery.
Low-power microprocessor technology enables the MC-III Panel Mount analyzer to operate approximately
2 years on a single lithium battery. The lithium battery is strongly recommended for use in extreme
temperatures (below -20°C).
Users can power the instrument from an external power supply or a 4-20 mA current loop, and use the lithium
as a backup power supply. The use of an alternate power source extends battery life and helps ensure that
timekeeping and volume accumulation will not be interrupted during a power failure.
External Power Supply
The MC-III Panel Mount can be connected to a remote power supply by a two-conductor cable (Figure 2.2).
The power supply and cable must be capable of supplying 6 to 30 VDC @ 10 mA. This capability is available
only if the 4-20 mA rate output is not used.
External Power Supply. The device will automatically switch to battery power when external power is lost. It
is recommended that the external power supply be an approved ELV source, insulated from the AC main by
double/reinforced insulation per CSA C22.2 No. 61010-1-04 / UL61010-1 – 2nd Edition.
Caution: When using the amp & square output with the external power supply, make sure the
power supplies for both features share a common negative (-) terminal or that they are
totally isolated from each other, since both share a common negative (-) connection.
TB
3
TB1
PULSE
INPUT
RESET
INPUT
TFM
A&S
GND
EXT POWER
TB2
RS485
SLAVE
4-20
OUT
PULSE
OUT
6
-
3
0
V
D
C
POWER
SUPPLY
6 to 30
VDC
J1
J2
RESET
SWITCH
BATTERY
Figure 2.2—External power supply wiring
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