Submersible Depth Sensor


Applied Measurements submersible depth sensor Pa993 is high accuracy, fully submersible and ideal to use in rivers, reservoirs, tanks and channels, submerged pipes and vessels, fountains, boreholes, pots and waters.  It has a slimline 23mm diameter body to suit most underwater pipes.

It uses a state-of-the-art 16-bit microprocessor, embedded within its electronics, enabling it to carry out linearisation and temperature compensation to give you accurate readings to less than ±0.25% of full scale.  If you require higher accuracy, we can also offer this submersible depth sensor with an accuracy of 0.1% or 0.15%.

Thanks to its selection of outputs including 4-20mA (2-wire), 0-5V (3-wire) and 0-10V (3-wire), we are confident that a suitable output can be found for your particular application.  Plus, if you are going to be using a data logger with the depth sensor, a ratiometric output of 0.5-4.5V from a 5V supply can also be offered.

To ensure high integrity underwater, Applied Measurements submersible depth sensor is constructed from 316 Stainless Steel and has a moulded cable exit with vented polyurethane (PUR) cable (NBR and EPDM seals are optional) along with an internal strain wire.  Its IP68 protection rating ensures it can be used at depths of up to 100m in long term submersion in water.

Applied Measurements can also provide a version compatible with seawater if required.  Plus, an internal temperature sensor for temperature and water level readings can be optionally provided.

In addition, the Pa993 submersible depth sensor has a surge protection circuit built-in, which help to lower any effects of close lightning strikes and power supply fluctuations.

If an SDI-12 output is required, please see our Applied Measurements Pa993D SDI-12 submersible depth sensor, which has an accuracy of <±0.15% of full scale as standard.


  • Ranges: 0-0.5mWG up to 0-100mWG
  • 23mm Diameter
  • Outputs: 4-20mA, 0-5V, 0-10V or 0.5-4.5V Ratiometric
  • Environmental Protection: IP68 to 100 metres
  • Accuracy: <±0.25%/FS (Optional 0.1% and 0.15% Versions)

About Sbmercible Depth Sensor

  • Compact 23mm Diameter
  • High Accuracy with 16-Bit Microprocessor
  • Fully Submersible for Long-Term Immersion up to 100m
  • High Integrity Waterproof Assembly
  • Robust Stainless Steel & Piezo-Resistive Silicon Sensing Element
  • Surge Protected from Lightning Strikes & Power Fluctuations

Technical Specifications

Pressure Ranges0.5, 1, 2.5, 5, 10, 20, 25, 50, 75, 100metres Water Gauge (mWG)
Safe Overpressure150% Pressure Range
Burst Pressure300
Rated Output2mV/V4-20mA0-5Vdc0-10Vdc0.5-4.5Vdc ratiometric
Wiring Configuration4-wire2-wire3-wire3-wire3-wire
Supply Voltage10-FebAug-32Aug-3213-325 (2.7 - 5.5)Volts DC
Load Driving CapacityN/A1000N/AN/AN/AOhms at Max. Supply Voltage
Electrical ConnectionsScreened polyurethane (PUR) cable with vent tube, strain and drain wire
Accuracy<0.25 (0.1 or 0.15 optional)±% Pressure Range
Temperature Range Operating-10 to +60 (non-freezing media only)˚C
Temperature Range Compensated20±20˚C
Temperature Effect on Output<0.015±%/˚C
Temperature Effect on Zero<0.02 (0.01 optional)±%/rated output/˚C
Environmental ProtectionIP68 to 100mWG (10bar) Moulded Cable Exit
Weight270 approx. (excluding cable) / Cable = 48/metregrams
Construction316L St/Steel, Viton + PUR (NBR + EPDM Seals optional)
Electrical ProtectionEMC Immunity: EN50082-1 & Surge (Lightning) Protection: EN61000-4-5

Produtc Dimensions

Wiring Detalis

Pa993 Wiring Diagram 4-20mA Output (2-wire)
Red+ve supply
Blue-ve supply & 4-20mA output in series
White-ve supply & 4-20mA output in series
Greencable screen
Pa993 Wiring Diagram 0.5-4.5Vdc, 0-5Vdc, 0-10Vdc Output (3-wire)
Red+ve supply
Blue-ve supply
Yellow+ve signal
Whiteto case
Greencable screen
Pa993 Wiring Diagram mV/V Output (4-wire)
Red+ve excitation
Blue-ve excitation
White+ve signal
Yellow-ve signal
Greencable screen


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