Teledyne 4220, Installation And Operation Manual, Page: 109 / 198

5-1
4220 Flow Meter
Section 5 Options and Accessories
This section describes accessories available for use with 4200
Series Flow Meters. There are two groups of accessories. One
group of options you can use with any of the 4200 Series. The
other group are accessories for a specific type of level sensing and
can only be used with one flow meter of the series. This section
covers the accessories that are usable with any 4200 Series Flow
Meter. Application-specific options are covered in the Instal-
lation sections of each type of flow meter.
Teledyne Isco offers the following options for use with all 4200
series flow meters:
• 4200T Modems
• 4-20 mA Outputs (Internal and External)
• Model 674 Tipping Bucket Rain Gauge
• Flowlink® Software (used with the modem or a laptop
computer)
• Parameter Probes - Temperature, pH (acidity/alkalinity)
and D.O. (dissolved oxygen)
• Mechanical Totalizer
• High-Low Alarm Relay Box
• YSI 600 Multi-Parameter Sonde
The 4-20 mA Output Interface, alarm box, rain gauge, and
parameter probes are options you can field-install any time. The
modems require factory modification to the flow meter, and you
should specify these options when you order. If you want to add
any of these later, you will need to return the flow meter to the
factory.
5.1 4200T Modem
The 4200T Modem is a circuit board installed inside the flow
meter that transmits flow meter data over standard telephone
lines. The modem also makes it possible for the flow meter to
receive data from compatible equipment at the other end of the
phone line. Modems allow digital equipment to talk and listen to
other remotely-located digital equipment over telephone lines.
5.1.1 How it Works The analog phone system cannot transmit digital signals
through repeaters; digital machines cannot communicate
directly over phone lines. Modems convert the data into tones
and transmit them over phone lines. The equipment on the other
end of the line answers with tones through its modem. The first
modem converts these tones back to digital data and interprets
it. The 4200T Modem is full duplex and works in the auto-answer