Teledyne 4220 Connection to a Power Source, Low Power Indication, Isco Sampler

	4220 Flow Meter
	Section 3 Installation
3.1.4 Opening the Case	To access the flow meter controls and internal 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 pro-
	gramming with the keypad. You can read the display through the
	window, so periodic readings may be taken without opening the
	case. Again, do not allow the flow meter to operate routinely with
	the door open.

3.2Connection to a Power Source

3.2.1 Low Power Indication

The 4220 requires a 12-volt, direct current (12 VDC) power input. This power may come from various sources:

•Companion Isco Wastewater 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 all these power sources to the flow meter are dis- cussed 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 program selections you have entered and also stored data in memory, if there is any. (Note that you must be using Flowlink software for any data to accumulate in memory.)

3.2.2 Isco Sampler	If you combine a 4220 Flow Meter with an Isco Wastewater
	Sampler in a flow-proportional 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
	internal printer’s chart speed, the flow meter will draw a signif-
	icant amount of power from the sampler's battery. In such cases
	it is better for the flow meter have its own battery.

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