Depth & Temperature recorder model TD301/TD303


  • Compact & robust design
  • Long term stability sensors
  • High memory capacity
  • Year-long battery capacity
  • Windows based software
  • Output in physical units
  • Online plotting
  • Burst mode: 5Hz
  • SAIV/Digi format output

  • Bathymetry
  • Temperature & depth profiles
  • Autonomous recording
  • R.O.V.
  • Towed systems

The TD301/TD303 are precision instruments measuring temperature and depth (pressure) in the sea, lakes, water reservoirs, groundwater, rivers and on R.O.V/A.U.V. etc. All settings like measuring interval, real time clock etc, are accessed via menu. The programmed settings and calibration coefficients are maintained in nonvolatile eeprom, and will not be
changed/lost if power is disconnected. The model TD301 has a built-in replaceable battery for self- contained recording applications. On/Off- switching is by a magnetic key or from keyboard. The model TD303 is for on-line applications with external power supply and has an extra feature of 5Hz sampling with programable output formats to suit the host unit. Both units have a built-in data memory "ring memory" where the oldest data will be overwritten when memory is full. Data are recorded in physical units and simultaneously transmitted via an RS232 I/O watertight connector for on-line use. Robustness and complete protection from leakage has been obtained by vacuum molding the electronic and all other components in solid polyurethane. A comprehensive PC-program is supplied with the units for easy communication, programming and presentation/processing of data. For remote readout and monitoring, the manufacturer offers several options: Communication Unit CU901, for two-way communication via Iridium satellite, GPRS with embedded web server, GSM and UHF/VHF.

Absolute types: TD301A/TD303A
Reference type: TD301R
Differential types: TD301D/TD303D


Ranges (absolute): 20, 50, 100, 200, 500...6000 dbar
Reference differential: 10,20,50,100 dbar. 10,20,50,100,200 dbar. Line max 2000 dbar
Resolution: 0.0001 dbar (m)
Accuracy: +/- 0.01% FS
Response time: 0.1 sec

Range: -2 to +40°C
Resolution: 0.001°C
Accuracy: +/- 0.01°C
Response time: < 0.2 sec

Memory CMOS SRAM: 44000 data sets of TD (ring memory)

Data Output: RS232 ASCII code. 1200-9600 baud. 1 start , 7 data, 1 stop even parity or
1 start, 8 data, 1 stop, no parity, selectable via menu

Programmable: 1 sec to 180 min
Burst mode: 5 Hz w/programmable data formats

Real time clock: +/- 2 sec/day


Material: Vacuum molded polyurethane and titanium

TD301:2 ea 3.6V lithium AA-cells. Recommended type:SAFT LSH 14500(Sufficient for 1.000.000 data sets)
TD303:External power supply 10-30 VDC

Current consumption:
Active:< 10 mA
Quiescent:< 50µA

Dimensions: TD301/303:Length 170 mm. Diam. 45 mm
Weight: TD301/303: In air: 0.5 kg. In water:, 0.3 kg.

Common: MiniSoft SD200W program Operating Manual
TD301: On/Off magnetic key, PC communication cable (2,5m)
TD303: Connector and 1.5m pigtail

Warranty: Two years against faulty materials and workmanship.

Download datasheet as PDF