Product Overview; Theory Of Operation; Product Components - Hach US9001 Manuel D'utilisation

Supporting test records reside with the manufacturer. The device complies with Part 15 of the FCC
Rules. Operation is subject to the following conditions:
1. The equipment may not cause harmful interference.
2. The equipment must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications to this equipment not expressly approved by the party responsible for
compliance could void the user's authority to operate the equipment. This equipment has been tested
and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules.
These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference, in which case the user will be required to
correct the interference at their expense. The following techniques can be used to reduce
interference problems:
1. Disconnect the equipment from its power source to verify that it is or is not the source of the
interference.
2. If the equipment is connected to the same outlet as the device experiencing interference, connect
the equipment to a different outlet.
3. Move the equipment away from the device receiving the interference.
4. Reposition the receiving antenna for the device receiving the interference.
5. Try combinations of the above.

Product overview

The ultrasonic level sensors measure the flow level and calculate the flow rate in open channels. The
flow rate is calculated based on the flow level and the primary device or the flow level and the
velocity supplied by a velocity sensor.
Status indicator light
When the sensor is connected to a flow logger and taking a reading, the status indicator light of the
sensor is on. Refer to
color descriptions.
Light color Description
Red No echo is found (echo loss).
Green Echo is found.
Flashing green The measurement target is too near the sensor (within 6.35 mm (0.25 in.) of the sensor
minimum distance).

Theory of operation

The flow level is measured by the ultrasonic sensor. The ultrasonic sensor makes a pulsed
ultrasound wave which is sent towards the water surface. The ultrasound wave reflects off of the
water surface and the echo is received back by the sensor. The distance is the measured time it
takes for the ultrasound wave pulse to go from the water surface to the sensor. The measured time is
multiplied by the speed of sound at the ambient temperature of the air below the sensor. The sensor
measures the ambient temperature for accuracy.

Product components

Make sure that all components have been received. Refer to
missing or damaged, contact the manufacturer or a sales representative immediately.
Figure 1 on page 6 and
Table 1 Status indicator definitions
Figure 2 on page 6. Refer to
Figure 1
Table 1 for the light
and Figure 2. If any items are
English 5