Teledyne 4220, Installation And Operation Manual, Page: 87 / 198

4220 Flow Meter
Section 3 Installation
3-5
3.2.5 Isco Lead-Acid Battery Teledyne Isco also offers a 6.5 ampere-hour 12-volt rechargeable
lead-acid battery to power the flow meter. This battery is similar
in size to the nickel-cadmium battery, except somewhat larger,
reflecting its 50% 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, if you allow it to run
down all the way to the point of cell-reversal.
• 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 and low temperature
operation can also ruin the battery. Proper operation
and maintenance is necessary for normal service life.
For detailed information on these batteries, refer to the Power
Products Guide . Please read that manual if you intend to use
lead- acid batteries on your flow meter.
3.2.6 Attaching the Isco
Lead-Acid Battery
T h e l e a d - a c i d b a t t e r y i n s t a l l s t h e s a m e w a y a s t h e
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 either type of battery for the condition of its charge
by “sparking” the output (shorting the terminals together with a
screwdriver or other tool).
3.2.7 AC Power Supplies Teledyne Isco also offers two different AC power supplies, the
High Capacity Power Pack and the Battery-Backed Power Pack
to power the flow meter. These power packs are designed for
operation from 120 Volts AC, 50/60 Hz commercial power
sources. Alternate versions, designed for operation from 240
Volts AC, 50/60 Hz are also available and are intended primarily
for export. Both are supplied with a line cord for convenient
attachment to the AC power source.