4210 Flow Meter
Section 3 Installation
3-2
The case and door have a seal between them and you should keep
the door closed and latched to protect the flow meter mechanism.
A case left open will defeat the purpose of the seal by causing the
desiccant canister to quickly saturate with moisture. Dust will
also begin to settle inside the case. Dust will wear the moving
parts of the plotter prematurely. Many flow meters are installed
in damp environments. Moisture and fumes dispersed inside the
case can form acids that will corrode the electronics, causing
unreliable operation and eventual circuit failure.
3.2 Connection to a Power
Source
The 4210 requires a 12 volt, direct current (12 VDC) power input.
This power may come from various sources.
• Isco Automatic Wastewater Sampler
• Isco rechargeable battery attached to the flow meter
(nickel-cadmium or lead-acid)
• Isco AC Power Supply attached to the flow meter
• From an external 12 VDC battery, such as a deep-cycle
marine, or RV type
3.2.1 Low Power Indication When power to the flow meter falls too low for the unit to operate
properly, the message POWER LOST/LOW BATTERY will
appear on the top line of the display. When power is lost or falls
below operating limits, the flow meter will stop accumulating
data, and the internal printer will not print, but the internal
battery-backed RAM will save stored data (if any) and the
program selections for the flow monitoring program you have
entered into memory.
3.2.2 Isco Sampler If you are using the 4210 Flow Meter with an Isco Wastewater
Sampler in a flow-proportional sampling system, you can power
the flow meter from the sampler's battery or power supply.
Connect the flow meter to the sampler with the 6-pin flow
meter-to-sampler cable. Use the connectors marked “Flow Meter”
on the sampler and “Sampler” on the flow meter. The flow meter
will then receive power from the sampler. Keep in mind that
under certain conditions, such as a “fast” setting on the internal
printer's chart speed, the flow meter will draw a significant
amount of power from the sampler. While this is no problem for
samplers and flow meters powered by an AC power pack, there
could be problems when you are using a battery. In that case, it
would be preferable for the flow meter to have its own battery.
Note
Do not attempt to run a sampler from a power source installed
on a flow meter. The sampler's pump draws heavy current,
particularly on start-up. The connect cable cannot carry such
currents. If you are using a single power source, always install
it on the sampler.
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