Teledyne 4220 - Manual (Page 88)

4220 Flow Meter
Section 3 Installation
3-6
Figure 3-2 Power Pack Installed on a Flow Meter
They are both capable of pow ering the flow meter. The
Battery-Backed Power Pack provides 12 VDC at 5 Amperes, and
is backed up by a 1.2 Ampere- hour nickel-cadmium battery. This
is built in a package the same size as the standard power supply,
and is intended for use where short-term power interruptions are
frequent but unacceptable for flow meter operation.
Note
The battery in the Battery-Backed Power Supply is of limited
capacity. It is intended for short-term backup duty only. With
one-fourth of the capacity of a standard battery, it cannot
power the flow meter for an extended period of time.
3.2.8 Attaching the Power
Supply
Mount the power supply on top of the flow meter cabinet the
same way as described for the battery. Secure the power supply
with the two rubber draw catches pulled over the brackets on the
ends of the power supply. Attach the short cable with the smaller
connector to the top connector on the right side of the flow meter
case. Connect the longer cord with the plug on it to an AC outlet.
Refer to Power Products Guide for details concerning charging
the batteries with the power pack.
3.2.9 External 12 Volt DC
Power
You can also power the flow meter from an external 12 VDC
source, such as an automotive, motorcycle, or marine battery.
Many people have found that a deep-cycle marine/RV battery is
particularly well-suited to this application. However, you will
have to mount batteries of this type externally, as they are too
large to fit on top of the flow meter.