4-1
4230 Flow Meter
Section 4 Optional Equipment
This section describes accessories and companion equipment
available for use with the 4230 flow meter. There are two groups
of equipment. One group can be used with any 4200 series flow
meter. The other group is equipment for a specific type of level
sensing and can only be used with the 4230 flow meter. This
section covers the accessories usable with any 4200 series flow
meter. Application-specific options are covered in the Installation
sections of each type of flow meter.
Isco offers the following options for use with all 4200 series flow
meters:
• 4200T Modem
• Internal and external 4-20 mA (Analog) Outputs
• 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, 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.
4.1 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.
4.1.1 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
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