Simrad PI Remote/Depth Sensor
The purpose of the PI Remote/Depth sensor is to achieve accurate measurements of both the water depth and the distance between the two trawl doors.

Dual wireless sensor for spread and depth measurements

The purpose of the PI Remote/Depth sensor is to achieve accurate measurements of both the water depth and the distance between the two trawl doors.

In order to measure the distance, it must be installed as a "slave" in a pair with PI Spread sensor. The sensor performs the following tasks:

  • It communicates with the PI Spread sensor to measure the distance between the trawl doors
  • It measures the current depth and transmits this information to the PI operator unit

Please note that the PI Spread sensor may be substituted with a PI Spread/Depth sensor.

READ MORE at the manufacturer's website

Simrad PI Spread/Depth Sensor
The PI Spread/Depth dual sensor measure the physical distance between the trawl doors as well as the depth of the trawl door.

Dual wireless sensor for spread and depth measurements

The PI Spread/Depth dual sensor measure the physical distance between the trawl doors as well as the depth of the trawl door.

The PI Spread/Depth is a "dual" sensor, and it performs the following tasks:

  • It communicates with the PI Remote sensor to measure the distance between the trawl doors, and transmits the current distance to the PI operator unit.
  • It measures the current depth and transmits this information to the PI operator unit.

Note that the PI Remote sensor may be replaced with a Simrad PI Remote/Depth sensor. This will provide you with the depth of both trawl doors.

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Simrad PI50 PI Height Sensor
With a built-in echo sounder, this new PI sensor is full of advanced technology. Wherever you place it, it will always tell you the exact distance to the bottom.

Accurate distance to the bottom!

With a built-in echo sounder, this new PI sensor is full of advanced technology. Wherever you place it, it will always tell you the exact distance to the bottom

Information from the sensor

The PI Height sensor measures the height over the bottom, that is the distance from the bottom and up to wherever the sensor is located. This provides you with a valuable range of applications for bottom and pelagic trawling.

Applications

Bottom trawl: Place the sensor behind the headrope, and it will tell you the height of the trawl opening. This allows you to adjust you equipment immediately if the opening is reduced, and you will avoid loosing catch.

Pelagic trawl: With a height sensor behind the footrope you will know at once if the trawl approaches the bottom. If you use a second sensor behind the headrope, the difference between the two measurements will give you the height of the trawl opening.

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Simrad PI50 PI Geometry Sensor
The purpose of the Simrad PI Geometry sensor system is to monitor the geometry of your trawl or danish seine.

Check the geometry of your bottom trawl, pelagic trawl and danish seine

The purpose of the Simrad PI Geometry sensor system is to monitor the geometry of your trawl or danish seine.

This is achieved by making accurate measurements of the distances between the centre of the headrope (or footrope) and each of the trawl doors or wing ends. If these distances are not identical the trawl (or danish seine) will be skewed and unbalanced, and this reduces the catch efficiency.

bm012226-015 0300 pi geometry family

The PI Geometry sensor system consists of:

  • One Simrad PI Geometry sensor
  • Two Simrad Mini-R responders

The results from the measurements made by the sensor system are transmitted by acoustic signals to the PI catch monitoring system mounted on the vessel. Based on the information, you can take immediate corrective actions if it is necessary to adjust the net.

The PI Geometry sensor system has been developed to be used on both bottom and pelagic trawls, as well as pair trawls and danish seiners.

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Simrad PI50 PI Depth Sensor
When the sonar and echo sounder tell you how deep the school goes, it is good to know that you can place your fishing gear at the same depth. And even better, you can monitor and hold the desired depth. The design is rugged and awardwinning, and the sensor is available for three different depth ranges.

How deep can you go?

When the sonar and echo sounder tell you how deep the school goes, it is good to know that you can place your fishing gear at the same depth. And even better, you can monitor and hold the desired depth. The design is rugged and awardwinning, and the sensor is available for three different depth ranges.

cd012206-010 depth measurement example

Information from the sensor

The PI Depth sensor provides information about the current depth and the depth changes of your gear.

Applications

Bottom trawl: On a bottom trawl, you will use the sensor to achieve full control when shooting, and to position the trawl on the slope.

Pelagic trawl: During pelagic trawling, you know how important it is to position the trawl relative to the largest concentration of fish. By using a Depth sensor, you can monitor the exact depth relative to the surface, and adjust the trawl depth accordingly. Additional depth sensors on the doors will monitor if the doors stay at the same depth.

Purse seine: During seining, use the Depth sensor to monitor the depth of the net, and the descending speed of the net. Then you will know when to start pursing, and which speed to use.

Danish seine: Mounted on a Danish Seine the Depth sensor monitors the sinking speed of the net, and it will tell you when to start hauling once the net has stopped sinking.

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Simrad PI50 PI Catch Sensor
This is your “eye” at the cod-end. With PI Catch sensors in use, you can easily monitor the filling rate and the amount of catch in the trawl. Save time and fuel, haul in the trawl at the right moment! The design is rugged and awardwinning, and the sensor’s sensitivity is easily adjusted for trawls of all sizes.

When is the trawl full?

This is your “eye” at the cod-end. With PI Catch sensors in use, you can easily monitor the filling rate and the amount of catch in the trawl. Save time and fuel, haul in the trawl at the right moment! The design is rugged and awardwinning, and the sensor’s sensitivity is easily adjusted for trawls of all sizes.

Some professionals claim that the PI Catch sensor is the most important sensor on the trawl. Why? Because it will tell you the amount of catch in the trawl.

BM0100C Catch sensor w200p

The sensor simply monitors the expansion of the meshes in the cod-end. Once the volume caught is enough to expand the meshes, they will pull the detector wires and engage the sensor. The sensitivity of the sensor can easily be adjusted, just extend the detection rubber bands to span additional meshes.

To monitor the filling rate, we recommend that you use minimum two sensors. Place the first sensor at the far end of the cod-end, it will tell you that the trawl is actually fishing. Place the second sensor closer to the trawl opening. Once the trawl is filled to the chosen location, the sensor is engaged, and you know that it is time to haul.

Use the PI Catch sensor to adjust the catch volume according to the production capacity, check that the trawl is fishing, adjust the caught volume to secure quality, and minimize the towing time to save fuel. These are only a few of the reasons why this sensor is considered to be so important.

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Simrad PI50 PI Temperature Sensor
Fishing in too warm or too cold water may be just a waste of time and money.

Too warm or too cold water?

Fishing in too warm or too cold water may be just a waste of time and money.

The same applies to a pelagic trawl placed on the wrong side of a thermal layer. Using advanced technology, rugged construction and award winning design, the PI Temperature sensor allows you to increase your fishing efficiency.

Information from the sensor

The PI Temperature sensor tells you the exact sea water temperature while you are fishing.

Applications

The water temperature is an important parameter. Fish and bait are temperature sensitive, and they are normally found within specific temperature zones for feeding and spawning.

However, the temperature layers in the water are changing constantly, and for this reason the temperature must be monitored constantly. Fishing in an area with unfavourable water temperature might be just a waste of time!

For any kind of trawling, use this sensor to monitoring and log the temperature. Then, increase your knowledge about the correlation between temperature, fish concentration and catch efficiency. On a purse seine net, monitor the temperature to see when you are passing the thermo-cline.

READ MORE at the manufacturer's website