This product is no longer available and has been replaced by: CS456,CS451. Some accessories, replacement parts, or services may still be available.
CS431-L Water Level and Temperature Sensor
Stainless Steel
Ideal for long-term deployment in harsh conditions
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications


The CS431 is a pressure transducer manufactured for use with Campbell Scientific dataloggers. It measures both water level and water temperature in canals, wells, ponds, harbors, lakes, streams and tanks. Campbell Scientific dataloggers measure the sensor's output and then converts the measured value to the desired units.

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Benefits and Features

  • Compatible with most Campbell Scientific dataloggers
  • Enhanced temperature calibration available (see Ordering Info)
  • Stainless-steel body and Viton and Teflon wire seals resist corrosion
  • Double-sealed cable harness protects the cable jacket and reduces the possibility of leakage
  • End cone is interchangeable with an NPT inlet allowing easy hookup and field calibration

The "-L" on a product model indicates that the cable length is specified at the time of order.


Detailed Description

The CS431 uses piezoresistive strain gage technology to measure water level and an on-board thermistor to measure temperature. Piezoresistive transducers include a strain gage bonded to a pressure-sensitive diaphragm. Electrical resistance changes as pressure changes on the diaphragm.

The CS431 has a 316 stainless steel body and Viton® and Teflon® wire seals that resist corrosion. Its double-sealed, cable harness protects the cable jacket and reduces the possibility of leakage. The end cone is interchangeable with a ¼” NPT inlet allowing easy hookup and field calibration. You can choose a polyurethane or Teflon cable (see Ordering Info). Both cable options are vented.


Available Pressure Ranges 5, 10, 30, 50, 100 psi
Pressure Measurement Repeatability ±0.1% FSO (typical)
Pressure Measurement Linearity ±0.1% FSO, (typical)
Typical Output Voltage Sensitivity 15 to 16 mV/V (at 20°C)
Typical Bridge Resistance 4 kohm (at 20°C)
Typical Excitation Voltage 0.8 V
Compensated Temperature 0° to 40°C
Operating Temperature -5° to +70°C
Diameter 2.13 cm (0.84 in.)
Maximum Cable Length 609.6 m (2000 ft)
Length 27.31 cm (10.75 in.)
Weight 1.4 kg (3 lb) with 15.24-m (50-ft) cable

Temperature Error

Standard Calibration (-SC) ±2.0% FSO (0° to 40°C)
Enhanced Calibration (-XC) ±0.2% FSO (0° to 40°C)


Datalogger Considerations

The pressure measurement requires two differential channels and one excitation channel, and the temperature measurement requires one single-ended channel and one excitation channel. The CR500 and CR510 do not have sufficient channels to measure both pressure and temperature.

Compatible Contemporary Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR9000X

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X
* *

*The CR500 and CR510 can only measure pressure. These dataloggers do not have suffiencient number channels to measure temperature.