User manual SIMRAD PI TWIN SPREAD QUICK REFERENCE GUIDE REV B

[. . . ] The results are transmitted to the vessel. When the sensors are not in use, check that the sensor lamps (D) do not flash from time to time, as this indicates that the sensor is on and is discharging its batteries. In this case, wash the sensor in fresh water to remove salt and dirt. If you operate with Fast update rate, the sensors must be charged approximately every 24 hours. [. . . ] Simrad AS assumes no liability for the improper charging of sensors or the use of chargers not specified in Simrad's sensor charging documentation. Main parts (A) = Negative charging and fastening lug (B) = Positive charging and fastening lug (C) = Communication link to the vessel (D) = Location of sensor lamp (rear side of PI Spread) (E) = Water switch sensor (F) = Transverse communication links to the two Remote sensors Note: The Twin Spread sensor and the PI system setup must also correspond, otherwise the communication will not work. The sensor update rate controls how often the sensor reads and reports the door spread. Note that a faster update rate will decrease the battery (CD11207A) C F B D B D )) A (CD11207B) A E D life. Fast (~5, 5 sec): Recommended for new trawl or gear or changes in rigging to monitor any instabilities or unexpected changes. This mode provides the shortest battery life before charging. Normal (~14 sec): Recommended for well known trawl, gear and door behavior with stable situations. Use this setting during normal conditions. Slow (~34 sec): Recommended to monitoring a stable situation over time, focus on door not falling over, broken sweep lines etc. The PI system will be more sensitive to bad communication conditions due to slow data update. This mode provides longest operational battery life before charging. System configuration Sensor configuration: The sensor must be configured with a unique sensor number. Select channel number and update rate according to the sensor's configuration. Write down the configuration for future reference. Status & Receiver: The Interference filter must be switched on. Set it to level 9 if you have noise problems from other hydroacoustic sources. Note that with the filter on, it will influence the signal spectrum shown in the Status display. Sensor filter: Switch this filter to Light. Set it to Heavy only if you experience excessive noise. Position Off will provide raw data and fastest possible response. Numerical AB presentation On the PI display, the S1 [m] F distances between the trawl doors are displayed G in the numeric display. H Two rectangles are S3 [m] used, one for each distance. [. . . ] Detailed information on how to install the adapters are provided with the installation kit. Installation principle The PI Twin Spread sensor is mounted on the port door. One PI Remote sensor is mounted on the center clump, while the other Remote sensor is mounted on the starboard door. It is essential that there is a clear line of sight between the transverse communication "eyes" (one on each sensor), and between the top of the PI Twin Spread sensor and the hydrophone on the vessel. (A) = Port trawl (B) = Starboard trawl (C) = Port door with the PI Twin Spread sensor mounted in an adapter. [. . . ]