66-STD-12 PLUS CONDUCTIVITY, TEMPERATURE, AND DEPTH (CTD) PROBE The Coastal Systems Station, Dahlgren Division,NSWC, Panama City, Florida intends to issue on a Sole Source basis a Purchase Order for a STD-12 PLUS Conductivity, Temperature, and Depth (CTD) Probe from Applied Microsystems, LTD, Sidney, British Columbia, Canada. No other manufacturer of CTD arrays has been idenitified. Salient characteristics of the CTD array follow. This CTD array consists of a 15 meter linear array of eleven (11) CT sensors spaced 1.5 meters apart with two pressure sensors, one at the midpoint and one at the bottom of the sensor string. The array will be towed at speeds of up to four knots with the top sensor at a depth of from one to five meters. A depressor will be attached to the bottom end of the sensor chain to maintain the array in near vertical alignment while being towed. The sensors are to be sampled simultaneously at a rate of eight to ten samples per second with the data transmitted topside serially using RS-485 prototcol. Sensor power will be provided by an external power supply located topside. Power supply shall operate from 110 volts AC, 60 Hz. Sensors are housed in underwater housings rated to a depth of 50 meters. The temperature thermistor is located relative to the conductivity cell to minimize salinity spiking. Range/accuracy of the sensors is: Conductivity -- 0 to 6.5 S/m range, 0.001 S/m resolution, +/- 0.01 S/m accuracy, and <30 millisecond response time at flushing speed of 1 m/s; Temperature -- 0 to 30 degrees Centigrade range, 0.001 degree resolution, +/- 0.01 degree accuracy, and <100 millisecond response time; Pressure -- 0 to 50 dbar range, 0.01 dbar resolution, +/- 0.05 percent full scale accuracy, and <25 millisecond response time. Cable consists of power and signal conductors with an inner strength member. Strength member available approximately two meters below the bottom sensor by mechanical temination for the attachment of user supplied depressor of up to 500 pounds. Strength member is also available to approximately two meters above the top sensor for attachment of the deployment line. Breakouts are provided every 1.5 meters for attachment of the 11 CT sensors and at the midpoint and bottom for attachment of the pressure sensors. Sensors are electrically mated to the cable using underwater connectors and are attached to the cable with fairings so that the sensor cells are aligned with the water flow as the cable is towed vertically. An additional 50 meters of electrical cable (power/signal) extend beyond the top attachment point for connection of the sensors to the topside data collection system. Software is provided for simultaneously querying each sensor (C-T and Depth), recieving the serially (RS-485 protocol) transmitted data and storing the data on the computer hard disk at a sampling rate of eight to ten samples per second. Software shall run on an IBM compatible i486 computer (user supplied). Delivery to the Coastal Systems Station, Dahglren Divsion, NSWC, Panama City, Florida 32407-7001 will be 90 days after issuance of the order. Note 22 applies.

Loren Data Corp. http://www.ld.com (SYN# 0553 19970123\SP-0001.MSC)