Section 18 Turbidity sensor with cleaning brush, HL7 (9195600)
18.1 Specifications
Specifications are subject to change without notice.
Specification Details
Method Nephelometric method based on ISO 7027 (International Standard, Second Edition
1999-12-15)
Measurement units NTU, FNU
Light source 880 nm LED
Range 0 to 3000 NTU
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Accuracy 0 to 100 NTU: ±1%; 100 to 400 NTU: ±3%; 400 to 3000 NTU: ±5%
Resolution 0 to 400 NTU: 0.1; 400 to 3000 NTU: 1.0
Maximum depth 200 m (656 ft)
Operating temperature –5 to 50 °C (23 to 122 °F), non-freezing
18.2 Product overview
N O T I C E
Do not manually turn the wiper arm because wiper motor damage can occur.
N O T I C E
The wiper can become temporarily attached to the sensor surface if it becomes dry. Do not operate the wiper dry
because wiper motor damage can occur.
The turbidity sensor with central cleaning brush (9195600) is shown in Figure 22. The turbidity
sensor has a wiper that cleans the optical surface of the sensor when power is applied to the sensor
and at the start of the logging warm-up time. The central cleaning brush cleans the surrounding
sensors when the wiper cleans the optical surface of the sensor.
Note: The turbidity sensor with central cleaning brush is only available for the HL7 sonde.
Refer to Sensor Settings in the online help to manually clean the turbidity sensor and surrounding
sensors and to set the number of wiper revolutions in a cleaning cycle.
Figure 22 Turbidity sensor with central cleaning brush (9195600)
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NTU and FNU are two names for the same measurement.
English 43
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