Model: 853 - Scientific Echo Sounder with Data Logger

SPECIFICATIONS:

Part Number: Model: 853
Manufacturer: GE Fanuc
Series: Mark II
Product Type: Scientific Echo Sounder with Data Logger
Frequency: 120 kHz
Receive Bandwidth: 10 Khz
Transducer Source Level: 210 dB
Pulse Length: 100 Μs
Console Access: RS-232
Operating Temperature: -5 to +35 °C
Transducer Receive Sensitivity: 180 Db
Power Input: 100–240V AC
Weight: 1.2 lbs
Form Factor: 1U rack-mountable chassis
Product Origin: USA

FUNCTIONAL DESCRIPTION:

Model: 853 is a Scientific Echo Sounder with Data Logger manufactured and designed by General Electric is part of the Mark I & II Series used in gas turbine control systems. The Model 853 Scientific Echo Sounder is a self-contained, programmable digital echo sounder with built-in flash memory data storage. Programmable parameters include operating mode, acoustic range scale, receiver gain, dive number, dive type, and ping timestamp. The unit is powered from 24VDC and is programmed using an RS-232 serial communications port connected to the power/data connector. Recorded echo sounder data can be downloaded from the internal SD flash memory card via the self-powered USB connector. The 853 has three operating modes:

• In Normal mode, the echo sounder pings when requested by the serial interface. The settings for each ping are based on the current programmable range and gain settings. The ping rate is dependent on the interrogation rate of the serial interface.

• In Glider mode, the programmable settings for range and gain are used; in addition, the echo data can be sampled periodically via the serial interface. Echo data from each ping is stored in the internal flash memory. The ping rate is once every four seconds.

• In Stand Alone mode, the echo sounder runs unattended using the programmable range and gain settings. Echo data is stored on a ping-by-ping basis in the internal flash memory. The ping rate is once per second.

OPERATION:

On power-up, the echo sounder defaults to Normal mode and waits for a Switch Data Command from the serial interface. If a Glider or Stand Alone mode command is sent, the unit will ping immediately, then write the 256-byte IKX ping return data to a file on the SD card (see filename details below). It will continue to ping once every four seconds (Glider mode) or once per second (Stand Alone mode). Successive Glider mode or Stand Alone mode pings are appended to the file until a new filename is issued. Sending a Normal mode command tells the unit to stop recording.

SWITCH DATA COMMAND:

The 853 accepts up to 27 bytes of switch data from the serial interface and must see the switch data header (2 bytes: 0xFE and 0x44 HEX) to process the switches. The unit will stop accepting switch data when it sees the termination byte (0xFD HEX). The termination byte must be present to process the switches.

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FREQUENTLY ASKED QUESTIONS:

What is the primary function of the Model 853 echo sounder?

The Model 853 is a scientific echo sounder with an integrated data logger, designed to measure underwater distances, detect objects, and capture echo profiles. It is particularly used in marine research, underwater exploration, and gas turbine control systems.

How large is each recorded ping data file?

Each ping produces a 256-byte IKX return data packet, which is stored in internal flash memory. Files grow incrementally with each ping and are automatically named for easy file management.

What is the transducer frequency and sensitivity?

The Model 853 operates at a center frequency of 120 kHz with a receive bandwidth of 10 kHz. It features a transducer source level of 210 dB and a receive sensitivity of 180 dB, making it capable of detecting subtle underwater acoustic reflections, even in challenging environments.