A submerged sensor head is protected from fouling by marine organisms by positioning the sensor head in a submerged hollow enclosure. The invention predicts when a multiplication of a number of operands will exceed a pre-determined number of bits based upon the fixed-point format of the operands. The pin electrode will provide an electrical contact with the needle and at the same time function as means for securing the needle in a desire position in the guide channel. The motor is drivingly connected to the first arm such that a rotation of the motor causes rotation of the first arm about its first end and moves the stepping member from a retracted position to an extended position, or vice versa. A Ti film covering the inner surface of the hole is formed by a chemical vapor deposition method. The fiber trays can be positioned in a fiber loading position in which the fiber is spliced and coiled into the tray.