Teledyne 4220 installation and operation guide Installation, Wiring to a 4200 Series Flow Meter

4220 Flow Meter

Section 5 Options and Accessories

and the other for low. The availability of form C contacts (both NO [normally open] and NC [normally closed] contacts) means you can switch loads either on or off. Relay contacts are rated 3 Amperes at 24 volts AC or DC. The alarm box operates on 12 VDC supplied from the flow meter. Current consumption in standby condition is approximately 10 mA. In alarm, current increases to 190 mA. You can connect as many as four alarm boxes to a flow meter, if the flow meter is powered from the AC line.

Note

Do not use the alarm box if your flow meter has a modem or uses Flowlink software (through either a modem or laptop computer).

Use the alarm box with caution in battery-powered installa- tions, as it will significantly increase power consumption.

	In standby condition, an alarm box consumes about one
	ampere-hour of battery capacity in four days (or reduces capacity
	approximately 25%). In alarm condition, one alarm box will com-
	pletely discharge a fresh (4 Ah) battery in 21 hours. Teledyne
	Isco recommends using only one alarm box in a battery - powered
	installation, and you can expect to change the battery more
	often.
5.6.1 Installation	The High-Low Alarm Relay Box is enclosed in a high-strength
	plastic box and is easily installed. Mount the unit with cor-
	rosion-resistant hardware through the 2 holes in the stainless
	steel mounting plate attached to the case. Two threaded holes in
	the case allow the use of either 1/2" conduit fittings or com-
	pression bushings. While the alarm box is suitable for use in
	damp locations, do not install it where there is any possibility of
	submersion. Where temperatures are expected to fall below
	freezing, Teledyne Isco recommends installation of the alarm box
	indoors or in a heated location, as the manufacturer of the micro-
	processor does not specify its operation below 32° F (0° C).

5.6.2Wiring to a 4200 Series Flow Meter

DANGER

Hazard of electric shock! Use the relay contacts for low voltage (24 V) pilot duty only. Do not wire 120 VAC or higher voltages to the relay contacts.

Connecting the High-Low Alarm Relay Box to a 4200 Series Flow Meter requires a cable and an M/S connector. A special cable, 25 feet long, is available from Teledyne Isco. On one end of the cable is a 4-pin, male M/S connector. Plug this connector into the Remote Printer/Rain Gauge connector on the flow meter. The

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