4210 Flow Meter
Section 4 Optional Equipment
4-10
4.8.1 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, Isco recommends installation of the alarm box indoors
or in a heated location, as the manufacturer of the micropro-
cessor does not specify its operation below 32° F (0° C).
WARNING
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.
4.8.2 Wiring to a 4200 Series
Flow Meter
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 Isco. On one end of the cable is a
4-pin, male M/S connector. Plug this connector into the Remote
Plotter/Rain Gauge connector on the flow meter. The other end of
the cable has 3 stripped wires. Attach them to the alarm box
according to the instructions in the alarm box instruction
manual.
4.9 Parameter Sensing The Isco 4210 Flow Meter has the capability of displaying,
recording, and (if FLOWLINK software is used) storing data pro-
vided from parameter sensors. The parameter sensors available
for the 4210 Flow Meter are for temperature, dissolved oxygen
(DO), pH, (concerned with the acidity or alkalinity of a solution),
and the YSI 600 Multi-Parameter Sonde. See Section 4.13 for
information on the YSI 600 Sonde. This section covers the Isco
pH, D.O., and temperature sensors.
4.9.1 Installation of
Parameter Probes
The parameter probes, as well as other Isco probes such as the
submerged probe and area-velocity probe, require complete, con-
tinuous submersion in the flow stream for proper operation. Dry
operation can damage the pH and D.O. probes. The YSI Sonde
(only) may be suspended vertically in the stream. Isco offers a
series of rings that provide mounting for the probes in round
pipes.
• Each probe snap-mounts to a specialized sensor carrier.
• The sensor carrier then attaches to the rings or
mounting straps.
• The probe cable is carefully routed out of the stream.
• Only the temperature probe can connect directly to the
flow meter's parameter probe connector.
B
LACK +12 VDC
G
REEN –12 VDC
W
HITE DATA
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