Paroscientific Digiquartz Depth Sensors

The Paroscientific 8CDP Series Intelligent Digiquartz® Depth Sensors provide the ultimate in precision water level measurement. Typical application accuracy of 0.01% is achieved even under difficult environmental conditions.


The remarkable performance of these depth sensors is achieved through the use of precision quartz crystal resonator whose frequency of oscillation varies with pressure-induced stress. A quartz crystal temperature signal is provided to thermally compensate the calculated pressure and achieve high accuracy over a broad range of temperatures. The depth sensors include waterproof housings with integral shock protection.

High accuracy, resolution, and stability make Digiquartz® Depth Sensors ideal for applications such as Tsunami detection, wave and tide gauges, platform levelling, underwater pipe laying and as depth sensors in ROVs and AUVs. All Depth Sensor ranges are available with either frequency outputs or integral intelligent electronics with bi-directional digital communications. (RS-485 Interfaces are only applicable to new models) Ashtead Technology has three ranges available; 60m, 270m and 700m are available, however deeper rated units are also available on request.

Dual RS-232 interfaces and on the new models RS-485 interfaces allow complete remote configuration and control of all operating parameters, including resolution, sample rate, and choice of engineering units, integration time and sampling requests. Commands include: Single sample and send, synchronised sample and hold, continuous sample and send, and special burst sampling modes.

Desirable characteristics include excellent long-term stability, 1 x 10-8 resolution, low power consumption and high reliability.


  • 0.01% Accuracy
  • 1 x 10 –8 Resolution
  • Unique Anti-Fouling Port
  • Low Power Consumption
  • High Stability and Reliability
  • Fully Calibrated and Characterized
  • ISO 9001 Quality System – NIST Traceable
  • Frequency Outputs or Dual RS-232 and RS-485 Interfaces

Technical information


Pressure Performance:
Accuracy typically better than 0.01% Full Scale (See SCD)

Calibrated Temperature: -2C to +40C

8B ≤± 0.01% Full Scale
8DP ≤± 0.005% Full Scale

8B≤± 0.01% Full Scale
8DP≤± 0.005% Full Scale

Over Pressure: 1.2 times Full Scale

Thermal Sensitivity: <0.0008% Full Scale /deg C

Pressure Signal: Nominal Frequency 37 to 42 KHz

Temperature Signal: Nominal Frequency 172 KHz


Input Voltage: +6 (Min) to +25 VDC

Current Consumption: 1.3 mA @ 6VDC (Typical)

Output Signal:
Nominal square wave of 4 volts amplitude peak-to-peak, capacity coupled
with source impedance <1,000 Ohms



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