User manual SIMRAD PI TWIN SPREAD QUICK REFERENCE GUIDE REV B

[. . . ] 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. If you operate with Fast update rate, the sensors must be charged approximately every 24 hours. Used with Normal or Slow update rates, the operational life is approximately 48 or 70 hours respectively. [. . . ] Note: Charging sensors at sub-zero temperatures can create explosive gasses. 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. 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. 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. 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. 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. [. . . ] 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. [. . . ]