Chemtrac Systems, Inc.
Page 15
DURA-TRAC
PATENTED MADE IN U.S.A.
SAMPLE INLET
3/4" BARB FITTING
TM
PVC Drain
Funnel
SAMPLE OUTLET
4" Cup
2" Line
FIGURE 7. Dura-TRAC Sensor Sample Connection
2.4 SAMPLE CONNECTION
Sample shall be connected to the sample cell inlet side. A 3/4" barbed fitting connection
is provided for hose connection. The PVC elbow opposite the inlet is the outlet. The
outlet sample must flow to an open drain (sample receiver). The cell cannot operate
properly if pressurized. Do not replace either fitting with any other type of fitting.
Start treated water sample through the cell at a rate of between 1 to 5 GPM. Make sure
the outlet is free of obstructions. Continuous reliability of the sample flow is essential.
Interruption of the sample flow will result in erroneous readings on the
Monitor/Controller. For Controller model SCC3500XRD operating in AUTO mode, loss
of flow to the Dura-Trac sensor will result in improper coagulant dosing. A suitable flow
alarm is recommended for maximum reliability.
IMPORTANT
On the SCC3500XRD, the pump control output of the controller must be set in the
MANUAL mode if the sensor is flushed or cleaned or if power to the sensor is
interrupted for any reason. The controller can be placed back in AUTO once power
and sample flow is restored. For system with Dura-Trac with flush with Sensor
Maintenance Module (SMM), during Automatic Flushing cycles, the pump control
output signal is maintained at a constant value (see Flush Menu).
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