4230 Flow Meter
Section 3 Installation
3-4
3.2.4 Isco Lead-Acid Battery Isco also offers a 6.5 ampere-hour 12-volt rechargeable lead-acid
battery. This battery is similar in size to the nickel-cadmium
battery, except somewhat larger, reflecting its greater capacity.
For those familiar with nickel-cadmium batteries, operation and
maintenance of these batteries differs somewhat. Fewer
charge-discharge cycles are possible, and a single deep discharge
can ruin a battery. There is a linear voltage decrease as the
battery discharges, while nickel-cadmium batteries show essen-
tially the same voltage throughout discharge. Failure to recharge
promptly can also ruin the battery.
Proper operation is necessary for normal service life. For more
information on these batteries refer to the Power Products Guide.
Please read that manual if you want to use lead-acid batteries.
Attaching the Isco Lead-Acid Battery – The lead-acid
battery is installed the same as the nickel-cadmium battery.
Place the battery on top of the case and secure it with the rubber
draw catches. Attach the connector to the flow meter. If your flow
meter is permanently installed, you may need to allow extra
clearance above the flow meter for the slightly greater height of
this battery.
CAUTION
Do not test any type of battery for its charge condition by
“sparking” the output (shorting the terminals together with a
screwdriver or other tool).
3.2.5 AC Power Supplies Isco offers two different AC power supplies, the High Capacity
Power Pack and the Battery-Backed Power Pack to power the
flow meter. These power supplies are designed for operation on
120 VAC, 50/60 Hz commercial power sources. Alternate ver-
sions, designed for operation from 240 VAC, 50/60 Hz, are also
available and are intended for export. Both have a line cord for
convenient attachment to the AC power source, and are capable
of operating the flow meter.
The Battery-Backed Power Pack provides 12 VDC at 5 Amps,
and is backed by a 1.2 Ampere-hour nickel-cadmium battery.
This power supply 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. This power supply is also available in 120 and
240-volt versions.
Attaching the Power Supply – Mount the power supply on top
of the flow meter cabinet the same as described for the battery.
Secure the power supply with the two rubber draw catches
pulled over the brackets on the ends of the case. 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.
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