The TD304 is a high precision instrument for recording/monitoring of tide or water level(tide gauge). It have a high accuracy temperature recording. Optional sensors can be added: dissolved oxygen, turbidity and fluorescence. For optional sensors with several sensitivity ranges, the TD304 has auto range capability. The accompanying software, SD200W, contains versatile functions for programming, postand online data processing and presentations: - multigraph, online plotting, density and depth calculations. The program is continuously extended according to customer's requests. The programmed settings and calibration coefficients are maintained in nonvolatile eeprom, and will not be changed/lost if power is disconnected. Robustness and complete protection from leakage has been obtained by vacuum molding the electronic and all other components in solid polyurethane. On/Off-switching is by a magnetic key or from keyboard. A sealed battery compartment contains two replaceable C-cells. The instrument is equipped with brackets for attachment to mooring fixture. The TD304 is available as absolute or reference types. The reference type is vented through the connector and a cable with internal air pipe. Data are recorded in physical units and simultaneously transmitted via an RS232 I/O watertight connector for on-line use. For remote readout and monitoring, the manufacturer offers : Communication Unit CU801.

Designations:
TD304A: absolute type (Tide)
TD304R: reference (gauge) type(Water level)

Also look at TD301(tide and water level) and Cu801(real time data acquisition) 

Conductivity: Inductive cell
Range: 0 to 70 mS/cm
Resolution: 0.01 mS/cm
Accuracy: +/- 0.02 mS/cm

Salinity: Calculated from C,T & D
Range: 0 to 40 ppt
Resolution: 0.01 ppt
Accuracy: +/- 0.02 ppt

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

Pressure: Specify desired depth range with order
Ranges: 500, 1000, 2000, -- 6000 m
Resolution: 0.0001 dbar (m)
Accuracy: +/- 0.01% FS
Response time: 0.1 sec

Sound Velocity: Calculated from S,T & D
Range: 1300 to 1700 m/s
Resolution: 1cm/s
Accuracy: +/- 5 cm/s

Dissolved oxygen: (optional)
Sensor type: SAIV205
Range: 0 to 20 mg/l
Resolution: 0.01 mg/l
Accuracy: +/- 0.2 mg/l

Fluorescence: (optional)
Sensor type: Fluorescein/Chlorophyll/Rhodamine/CDOM
Ranges: 2.5, 7.5, 25, 75 ug/l selectable/autorange
Resolution: 0.03 µg/l

Turbidity: (optional)
Sensor type: Backscatter
Ranges: 12.5, 62.5, 250, 750 FTU selectable /autorange
Linearity: < 2%

Real time clock: +/- 2 sec/day

Modes: STD/CTD with/without sound velocity, oxygen and optional sensor.

Intervals: 1 sec to 180 min.

Memory: CMOS SRAM
Capacity: 56000 data sets of STD/CTD

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

Power: 2 ea. 3.6V lithium C-cells.
Recommended type: SAFT LSH14 (Sufficient for 1.500.000 data sets)
External: 10-30VDC

Material: Vacuum molded polyurethane and titanium
Dimension: Length 400 mm. Diameter 60 mm
Weight: In air: 2 kg. In water: 0.8 kg.

Packing: Suitcase (534x427x157 mm), Grossweight 5,5 kg

Accessories: (included) On/Off magnetic key, PC communication cable 2,5m,
MINISOFT SD200W program and Operating Manual

Warranty: Two years against faulty materials and workmanship

Download datasheet as PDF