Walchem WDS100, Инструкция по эксплуатации

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4
Flow Cell Placement
Instructions for mounting the sensor into the process can vary greatly with
the circumstances that are encountered in your application. Here are some
general guidelines to assist you. Refer also to the typical installation
drawings.
The flow cell should be placed on the discharge side of a circulation pump
or downhill from a gravity feed. Flow into the cell must come from the
bottom side that has the 8 mm OD tubing x ¼” straight thread fitting
installed.
The outlet of the flow cell must be plumbed to open atmosphere unless the
system pressure is at or below 8 atmospheres. If the flow through the line
cannot be stopped to allow for cleaning and calibration of the sensor, then it
should be placed in a by-pass line with isolation valves to allow for sensor
removal. Install the sensor vertically, with the measuring surface pointing
down, at least 5 degrees above horizontal. (Refer to Installation drawing)
Flow rate regulation must be done upstream from the sensor, because any
flow restriction downstream can increase the pressure above the rated value.
The acrylic flow cell has a flow regulator knob on the lower left hand side.
The sensor should be installed in an area where there is good solution
movement and where it will respond rapidly to chemical additions. The
placement of the sensor relative to the placement of chemical
replenishment, along with the quality of the mixing, and the replenishment
chemical flow rate are critical to accurate process control.
To avoid biological growth on the electrodes, which can block
measurement, never leave the sensor in water without oxidant for longer
than 24 hours, unless using the optional cleaning attachment.
Installing Sensor into Flow Cell
1. For sensors without the cleaning attachment, unscrew the 1 ¼” fitting
from the acrylic flow cell. Insert the sensor as shown below.
Push the 1 ¼” fitting over the sensor and fasten it tightly. Make sure that
the sensor is tightly fastened in place, otherwise it may be pushed out of
the flow cell when it is under pressure, or leaks can occur.
2. For sensors with the cleaning attachment, unscrew the 1 ¼” fitting from
the acrylic flow cell. Insert the sensor with mounted cleaning attachment
and o-ring holder into the flow cell by turning it CLOCKWISE until the
o-ring holder is snug (turning CCW can loosen the electrolyte housing