4210 Flow Meter
Section 3 Installation
3-18
3.6.10 Alternative Flow
Measurement Systems
Because of the characteristics of ultrasonic liquid measurement,
there may be some installations where the ultrasonic method is
either unreliable or inaccurate. In these instances, it is worth-
while to consider use of the submerged probe level sensor (Isco
4220 Flow Meter) use of the bubbler technique (Isco 4230 Flow
Meter), or use of the area-velocity technique (4250 Flow Meter).
Information on these companion units to the 4210 is available
from their respective manuals or from the factory. Call for more
information.
3.7 Associated Equipment You can use the 4210 Flow Meter with a variety of other
equipment. The following sections give instructions for con-
necting other equipment to the 4210.
3.7.1 Isco Sampler One of the uses of the 4210 Flow Meter is to control a sampler in
a flow-paced sampling mode. Flow-paced sampling means
that the flow meter is programmed to signal the sampler to take
a sample after a specific volume of flow has passed through the
flow stream, rather than after a period of time. In this way, the
sampler and flow meter are able to compensate for varying flow
rates. You can use the 4210 Flow Meter with any of the Isco Sam-
plers listed in Section 1.
An optional 25 foot (7.6 m) connect cable is available to connect
the flow meter to the sampler. Attach the six-pin female con-
nector on the cable to the SAMPLER connector on the side of the
flow meter. (This is the second connector from the top.) Attach
the connector on the other end of the cable to the FLOW METER
socket on the sampler. The flow meter will then be connected to
the sampler's power supply, and the sampler will be able to
receive flow-proportional signals from the flow meter. Refer to
the sampler manual for further details.
Note
The flow meter-to-sampler connect cable has been changed. It
now has six wires. This new cable must be used if it is desired
to use the software “Sampler Enable” feature. Previously avail-
able cables will not allow this feature to work. Pin “F” is not
connected; this pin may be checked with an ohmmeter. A
“new” cable will show continuity (zero ohms) between the two
“F” pins; an “old” cable will show open.
3.7.2 Connection to Other
Isco Equipment
Isco manufactures a variety of accessories for use with the 4210
Flow Meter. Among these options are: two different types of
modems, single and multiple parameter sensors, an alarm relay
box, a tipping bucket rain gauge, a 4-20 mA output device,
software, and a mechanical totalizer.
Descriptions of each of these options, as well as information
about their use, is provided in Section 4.
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