Hach US9001, User Manual

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Problem Possible cause Solution
Inaccurate
measurements The pipe or channel where the sensor
is installed is small or too narrow. The
ultrasonic signal bounces off the sides
of the pipe or channel. Install the sensor in a larger diameter pipe or
move the sensor nearer to the water surface.
Keep the downlooking sensor a minimum of
13.34 cm (5.25 in.) from the water surface. Keep
the in-pipe sensor a minimum of 0 cm (0 in.) from
the water surface.
As an alternative, increase the minimum distance
value to a location below the false target that is
affecting measurements.
The sensor is in direct sunlight. Do not let the sun shine directly on the sensor.
Make a sun-shield if an alternative location is not
available. Contact technical support for ideas for
the specific environment.
The temperature of the sensor
environment has changed quickly. Let the sensor stabilize after large changes in the
temperature of the environment.
The sensor is too far away from the
surface of the measurement target. Install the sensor near the surface of the
measurement target.
Measurement
failure Foam, oil, debris and surface
turbulence are affecting the send and
receive signal. Clean the sensor. Refer to Clean the sensor
on page 15.
Replacement parts and accessories
W A R N I N G
Personal injury hazard. Use of non-approved parts may cause personal injury, damage to the
instrument or equipment malfunction. The replacement parts in this section are approved by the
manufacturer.
Note: Product and Article numbers may vary for some selling regions. Contact the appropriate distributor or refer to
the company website for contact information.
Replacement parts
Description Item no.
Gasket, vibration isolation 6820
Holder (level) for US9003 (in-pipe) sensor 9488700
Accessories
Description Item no.
Extension cable with connectors, 15.24 m (50 ft) 9489000
Extension cable, 82.29 m (270 ft), bare wire one end, cable only 9488100
Extension cable with bare-wire and junction box, 30.48 m (100 ft) 8315200
Extension cable with bare-wire and junction box, 82.29 m (270 ft) 8315201
Extension kit for conduit, includes: 82.29 m (270 ft) cable with bare wires and junction
box with 30.48 cm (12 in.) cable and connector to logger
Note: Order the ultrasonic sensor, dispensing gun, and gel cartridges separately.
9488000
Gel cartridges (3x) with feed tubes, for the junction box (if used) to keep water out 7725600
Gel cartridge, dispensing gun 7715300
16 English