4210 Flow Meter
Section 3 Installation
3-3
3.2.3 Isco Nickel-Cadmium
Battery
Isco offers a 4-ampere-hour 12-volt rechargeable nickel-cadmium
battery to power the flow meter. Isco packages this battery spe-
cifically for use with Isco flow meters and samplers. Refer to the
Power Products Guide accompanying this manual for detailed
information about this battery and the procedure for charging it.
Install the battery on the top of the flow meter case, and attach
its connector to the 12 VDC connector on the side of the flow
meter. Place the battery with its cable pointing toward the right
side of the cabinet. Secure the battery by stretching the two
rubber draw catches on top of the flow meter until they slip over
the two metal “U” brackets mounted on the ends of the battery
case. Then screw the battery connector into the top mating con-
nector on the right side of the flow meter case.
Figure 3-1 Battery Installed on Flow Meter
3.2.4 Isco Lead-Acid Battery 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 taller, reflecting
its 50% greater capacity.
The lead-acid battery installs the same way 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.
For those familiar with nickel-cadmium batteries, operation and
maintenance of lead-acid batteries differs somewhat. Fewer
charge-discharge cycles are possible, and a single deep discharge
can ruin a lead-acid battery. While nickel-cadmium batteries
show essentially the same voltage throughout discharge, there is
a linear voltage decrease as the lead-acid battery discharges.
Failure to recharge promptly can also ruin the battery. Proper
operation is necessary for normal service life. For detailed infor-
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