Kongsberg Simrad MPT 331 DTRDUB Transponder – Available for rental, hire and ex-rental purchase from Ashtead Technology.
The medium frequency Kongsberg Simrad SPT 319 transponder has 56 channels for use with the HPR series and the HiPAP systems. This transponder replies with a single or a multipulse response. This reply contains different information to the HPR or HiPAP systems depending on the current application.
The transponder consists of the following main components: Transducer-head, Battery, Electronics, Housing.
The transponders are supplied with different transducer heads. The last digit in the model number identifies the width of the beam pattern. The battery type provided will vary, as some types require very high energy for the transmitting pulse. The electronic circuitry with software is modular and used with all models, while the physical housing length varies with transponder type.
The MPT has a Dual Beam option. This is designed for use in Long Base Line deep water positioning. The array calibration is performed with the use of a doughnut-shaped beam. When the calibration is completed, this beam will be switched off and the transponder will then only operate with the ±15° beam upwards. This saves battery energy, extending the transponder s lifetime. The MPT can be operated in both Super-Short Base Line (SSBL) and Long Base Line (LBL) modes. All required telemetry functionality is built-in.
The transponders are not only compatible for use with the HPR 400 series and HiPAP systems. The MPT transponders can also be used by the HPR 309/310 and even earlier models with the originally 14 channels. The transponder channel is preset from the manufacturer, but can be altered by either adjusting internal switches or by acoustic telemetry from the HPR 400 and HiPAP systems. HPR 309/310 and earlier systems cannot send telemetry for this purpose.
The acoustic telemetry link may be used to: Set the transponder into different modes of operation, transfer data from the transponder, set the transponder receiver sensitivity and transmitter power level. This is used to achieve optimal performance and battery lifetime. Read remaining battery lifetime. Change the pulse length and turnaround delay
The transponder may be secured to a subsea structure using mounting brackets, or fitted with an anchor weight and buoyancy collar for location on the open seabed. The unit is designed for ROV manipulator handling.
The transponder is normally self-contained with power supply using very long life lithium battery. As an option, a transponder may be externally powered. A rechargeable battery with battery charger are available. The rechargeable battery pack may be used as a replacement for the standard transponder battery L10/36.
The housing material (stainless steel) is selected for long mechanical lifetime, especially in environments exposed to corrosion. The units are very robust.
|3xx||30 kHz band|
|x3x||3000 metre depth rated|
|xx1||±15° beam width|
|xxiDuB||Dual Beam (±15° upwards and horizontal doughnut )|
|xx9||±90° beam width|
|DT||Depth and Temperature sensors|
|I||One set Inclinometers (X/Y angles)|
|II||Split unit with two sets of Inclinometers (X/Y angles)|
|R||Includes Release mechanism|
|RspSx 110Vac||Responder, Short tube, small backup battery|
|Max depth Rating||3000 m|
|Housing Material||Stainless Steel|
|Flange and transducer head material||Stainless Steel|
|Overall Length||1650 mm|
|Transducer Beam Widths||±90°, ±15°|
|Transducer Beam Widths with doughnut||±15°|
|Source Level (relative to 1 µPa. Ref. 1m)||±90°, 4 steps of 3 dB: max 195 dB ±15°, 4 steps of 3 dB: max 206 dB|
|Sidebeam (Dub): max 192 dB Rx sensitivity, 2 steps: 106/100 dB (Relative to 1µPa)|
|Frequency Band||Tx: 24.5 32.5 kHz Rx: 20.0 27.0 kHz|
|DuB Version Weight||In air: 62 kg In water: 41 kg|
|Transducer Beamwidth Dual Beam (DuB)||Vertical: ±15° Horizontal: ±15°|
|Lithium Battery Type||L10/36|
|Maximum continuous on-time||180 days|
|Quiescent time||930 days|
|No. of replies, low source level||6.4 million|
|No. of replies, maximum source level||1.6 million|
|Depth Rating||3000 m|
|Total Weight in Air||77 kg|
|Total buoyancy in water||65 kg|
|Overall Height||950 mm|
|Width x Depth||450 x 450mm|
|Diagonal diameter||640 mm|
|Weight in air||60 kg||132.2 lbs|
|Weight in water||42 kg||92.6 lbs|