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T: 514-354-2511
T: 1 800 463-4363
F: 514-354-6948
Pressure sensors, depth player Environment

Pressure sensors, depth player

Product Code:SDT-II

Need more Info? (514) 354-2511 - 1-800-463-4363

The Stevens Submersible Depth Transmitter II (SDT-II) is a sensing device designed for water level measurement applications. It is totally sealed for direct insertion into the media to be monitored, and offers multiple applications. Low range units are ideal for open-channel flow applications. Higher range units may be used for ground water, storage tank, or other suitable applications.


A stainless steel pressure transducer is used as the primary sensing element, and measures the water depth by pressure above the unit. Internal electronics within the PVC housing convert the signal to a 4-20 mA output, with 4 mA corresponding to zero depth (atmospheric pressure) and 20 mA to rated depth for the selected range.

The SDT-II is equalized for atmospheric pressure changes, and is insensitive to cable parameters. The unit offers low electrical noise pickup.
On standard flumes or other monitoring wells or chambers, the SDT-II can be bracket mounted, bulkhead mounted, pipe mounted, suspended, or T-mounted. Custom cable lengths are available. Each SDT-II comes complete with a junction box for making connection to the receiving equipment, and for holding desiccant.


Power  12.5 - 35 VDC
Output  4-20 mA current signal, linearly corresponding to range
Operating temperature  +1 to 50° C (33 to 122° F)
Note: SDT-II should not be subjected to freezing water conditions
Media  Any media compatible with 316 stainless steel, PVC, nylon, and polyurethane
Accuracy  Linearity: 1 %, typically .25 % of full scale
Zero  4.0 ± 0.2 mA at 22° C
Span  20.0 ± 0.5 mA at 22° C
Thermal zero drift typical  0.1 % of span per degree Celsius


  • SDI-12 serial interface capability
  • Accuracy to better than .05%
  • Ranges from 17.5 the 350 feet of water level change, full scale
  • Rugged stainless steel construction, less than 1.25" diameter
  • Low power operation


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