17
SPECIFICATIONS
Drain connection 10 mm (
3
/
8
”) barb
Process pH/temp probe HI1005
Process ORP probe HI2008
Power supply
115 VAC ± 10% or 230 VAC ± 10%;
50-60 Hz; 20 VA
Case NEMA-4X
CHLORINE MEASUREMENT
Referring to the drawing on page 11 and the Fluidic Diagram on page 18, the Sample Line is
connected to the instrument at the Sample Port (#17); an internal Regulator (#14) reduces the
inlet pressure from a maximum of 4 bar (57.2 psi) down to 1 bar (14.3 psi); from the Regulator a
nylon tube is connected to the input of the Electrovalve (#21). The output of the valve goes to the
Drain Port (#11) and then to the Measuring Cell (#8). An optional Filter can be installed to the
sample port if the stream is excessively turbid.
The sample coming from the line normally flows through the Measuring Cell (#8). It goes out from
the Measuring Cell through the Drain Tube (#9) and the Output Port (#10).
The Measuring Cell is accessible from the port placed on the top (#7) for speedy cleaning and
maintenance.
During the 100 seconds preceding the sampling, the analyzer solenoid input valve is open to allow
sample flow to flush the colorimeter cell. Every 3 to 90 minutes (user selectable), the electrovalve
closes stopping the sample flow and leaving the sample cell full of fresh sample. Cell volume is
controlled by an overflow gateway.
As the sample inlet electrovalve closes, a series of measurements (with LED on and off) of the unreacted
sample is taken to determine an average blank level prior to reagent addition.
The measurement of sample blank signal permits compensation for any turbidity or natural color, and
provides the zero reference point for the measurement.
The two channel Peristaltic Pump (#5) starts rotating causing a precise quantity of buffer and indicator
(#15 and #16) to enter the colorimeter sample cell. Here a magnetically coupled stirrer mixes the
reagents with the sample.
OPERATING DESCRIPTION
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