Operation Manual

Sensors

123

850-165186 / Rev.B

Mounting

Location: Attach the sensor on top of the cod-end where the

catch is to be monitored. As the cod-end fills, the net’s meshes

will open pulling the detector wires activating the sensor.

Sensor attachment to a net with an approximate mesh size of 140 mm. The distance

between the anchor points for the attachment rings and rubber straps will vary

according to mesh size and sensitivity required.

(A) = Carabine hook and screw link

(B) = Steel attachment rings bent to the net

(D) = Detection wires

(E) = Rubber strap

(F) = Attachment point

Attachment: The Catch sensor’s orientation towards the vessel

is maintained by the steel and nylon attachment rings. The

number of meshes the attachment rings are supported between

must be restricted to avoid unnecessary stress on the sensors

fastening lugs when the cod-end is filled to maximum. The use

of both nylon and steel attachment rings is required to secure the

sensor lugs if excessive forces are applied on them. The nylon

rings will stretch or break down, but the steel ring will prevent

the sensor from being lost. Note that two steel rings must be

mounted on the same side.

Sensitivity: The sensitivity of the Catch sensor is determined by

the number of meshes separating the rubber straps. You can

simulate this by stretching the net’s meshes to approximate the

mesh opening estimated to trigger the sensor. Mark the location

(with colored thread) for future references.

Rubber straps: Inspect the rubber straps regularly and always

before a new haul. Replace them if you detect visible signs of

cracks or damage.