Transmissometers have variable path lengths - generally the longer the path length, the greater the sensitivity in clean waters. Because the minimum path length is usually 10 centimeters, a transmissometer will not fit into Hydrolab's standard sensor guard or storage cup. The transmissometer can be removed easily for storage, calibration, or when transmissivity measurements are not needed. The transmissometer is powered and controlled by the DataSonde 4 Multiprobe, and the readings are integrated with the standard multiprobe data stream or logging records. Hydrolab transmissometers are configured to measure with red light.
Calibration is made with a water standard for which the transmissivity is known.
Because transmissometer lenses are exposed to the water being measured, sedimentary or biological deposits can impair calibration. Hydrolab Corporation Site development by MTC Interactive. Site Hosting by Business Network Services, Inc.