Opening The Case; Connection To A Power Source; Low Power Indication; Isco Sampler - Teledyne 4250 Installation And Operation Manual

3.1.3 Opening the Case

3.2 Connection to a Power
Source

3.2.1 Low Power Indication

3.2.2 Isco Sampler

To access the flow meter controls and plotter, you must open the
case. Unlatch the two catches on the right side of the case and
pull open the lid. You will need to open the case whenever you
change the plotter chart, or change the programming with the
keypad. You can read the display through the window, so you can
take periodic readings without opening the case. Again, do not
allow the flow meter to operate routinely with the door open.
The 4250 requires a 12-volt, direct current (12 VDC) power
input. This power may come from various sources:
• Companion Isco sampler
• Isco Nickel-Cadmium Battery
• Isco Lead-Acid Battery
• Isco AC Power Supply
• External 12 VDC battery, such as a deep-cycle marine or
RV type
Detailed information on power sources is provided in the Power
Products Guide provided with this manual. The procedures for
connecting various power sources to the flow meter are discussed
in the following sections.
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 measuring level,
the display will go blank, and the internal printer will not be able
to print. However, the internal battery-backed RAM will retain
your program selections and stored data in memory, if there is
any. (Note that you must be using FLOWLINK software for any
data to accumulate in memory.)
If you combine a 4250 Flow Meter with an Isco Wastewater
Sampler in a flow-paced sampling system, you can power the
flow meter from the sampler's power supply. Connect the flow
meter to the sampler with the Isco flow meter-to-sampler cable.
This cable attaches to the Sampler connector on the flow meter
and the Flow Meter connector on the sampler.
The flow meter will then receive power from the sampler. Keep in
mind that under certain conditions, such as a fast setting on the
chart speed, the flow meter will draw a significant amount of
power from the sampler's battery. In such cases it is better for the
flow meter to have its own battery.
4250 Flow Meter
Section 3 Installation
3-3