Watts HF scientific 28030, Owner'S Manual

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CLX-XT (28652) Page 9
REV 5 (5/2020)
4.2 Plumbing
The instrument is designed to require very little head pressure to operate, but will need
around 0.34 bar (5 PSI). The maximum pressure for proper operation should not exceed
10.3 bar (150 PSI). The maximum allowable fluid temperature is 55°C (131°F).
Opaque tubing is recommended be used if the tubing will be exposed to sunlight, to
prevent algae growth. Please note that the supplied sample inlet connector is compatible
with ¼” O.D. semi-rigid or rigid tubing.
The instrument is equipped with an internal cabinet drain (vent) to prevent damage in the
event of a tubing failure.
The main sample drain tubing connects to a hose barb. The rated tubing size is ½” ID
tubing. It is recommended that opaque tubing be used to prevent algae growth. Keep this
tubing as short as possible. This drain must be kept open to the atmosphere.
The drain must be open to the Atmosphere for proper operation.
The fluid waste from drain connection of this instrument contains reagents diluted
with large quantities of sample water. If this is only drained into the ballast water
stream it is safe to discharge overboard. In most instances this wastewater should be
returned to the ballast tanks
4.3 Electrical Connections
Most of the electrical connections to the instrument are made at the termination area
which is located on the left side of the instrument. Remove the high voltage cover by
loosening the captive screw. The connections are labeled and are self-descriptive (see
photo below). Please follow all local and government recommendations for installation of
electrical connections to and between the instrument and other peripheral devices.
Plugs are inserted into the RS-485 and 4-20mA cable bulkheads when shipped, to ensure a
watertight seal. These plugs should be removed and discarded when cabling to either of
these connections.
The power cable bulkhead will accept cable diameters from 5.8mm (0.23 in.) up to 13.9
mm (0.53 in.). All terminals are designed to accept wires in the range of 14-28 AWG. All
wires should be stripped to a length of 6 mm (¼”). A strain relief strap is provided to
reduce tension on the power terminals.
It is the user’s responsibility to assure that a watertight seal is maintained after the CLX-
XT has been wired for operation. If any of the bulkheads are not tightened properly
around a cable or plug, the ratings of the instrument will be jeopardized and there is a
possibility of creating a shock hazard.
Only qualified electricians should be allowed to perform the installation of the
instrument as it involves a line voltage that could endanger life.