CRS451 Stainless-Steel Stand-Alone Pressure Transducer
Self-Contained Memory
Easy to use software, reliable hardware
weather applications water applications energy applications gas flux and turbulence applications infrastructure applications soil applications


The CRS451 consists of a water-level and water-temperature sensor that has its own time clock and memory to store the collected data, in a compact stainless-steel case. This frees users to place the sensor in remote sites and let it collect data for long periods. The sensor can then be retrieved, connected to a PC via a micro-USB port, and the data transferred to the PC. HydroSci software is included and elegantly supports test setup, data retrieval, and data display. Long battery life and rugged construction mean you can trust the CRS451 to collect important data. Low cost and ease of use make it a good choice in a variety of applications. The CRS456 is the same as this, but with a titanium case.

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Benefits and Features

  • Sensors and data-collection features in one instrument case
  • Rugged stainless-steel case protects piezoresistive sensor
  • Quality construction ensures product reliability
  • Fully temperature-compensated
  • Fast scan rate
  • Large data-storage capacity
  • Long battery life
  • Easy-to-use software


CRS451 water-level recording sensor
CRS451 water-level recording sensor
CRS451 water-level recording sensor
CRS451 water-level recording sensor
CRS451 with 31648 cable grip attached
31648 cable grip
31648 cable grip

Detailed Description

The CRS451 has several pressure range options. The CRS451 is unvented; therefore it is monitoring sealed gage pressure. For maximum accuracy, the data should be corrected for barometric pressure. 

HydroSci software is available for download. This software simplifies the process of configuring the CRS451. Users can configure the CRS451 to monitor surface water, ground water, or a standard pump test.

HydroSci software will also compensate the measurements for barometric pressure using an additional CS451 or a CS456 as a reference sensor, or using a barometric pressure sensor from a nearby weather station.

HydroSci software will display the data in tabular or graphical formats.


Venting Unvented
Measurement Time < 1.0 s
Output Options micro USB
Internal Data Collection Memory 4 MB
Logging/Scanning Modes Standard, Delta, Wave, Logarithmic
Resolution 0.0035% FS
Dry Storage Temperature Range -10° to +80°C
WARNING: Sensor could be damaged if encased in frozen ice.
Operating Temperature Range 0° to 60°C
WARNING: Sensor could be damaged if encased in frozen ice.
Overpressure 2 x pressure range
Power Requirements Internal user-replaceable lithium battery
Water-Level Accuracy ±0.1% full-scale-range TEB
Includes the combined errors due to nonlinearity, hysteresis, nonrepeatability, and thermal effects over the compensated temperature range, per ISA S51.1.
Battery Life 5 years (when logging interval is once per hour)
Body Material 316L stainless steel
Temperature Accuracy ±0.2°C
Ingress Protection Exceeds IP68
Diameter 2.22 cm (0.875 in.)
Length 22.23 cm (8.75 in.)
Weight 230 g (0.51 lb)

Power Consumption

Quiescent < 80 µA
Measurement/Communication 4 mA (1 s measurement)

Measurement Ranges at Fresh Water Depths

0 to 5.1 m (16.7 ft)
  • 0 to 7.25 psi
  • 0 to 50 kPa
0 to 10.2 m (33.4 ft)
  • 0 to 14.5 psi
  • 0 to 100 kPa
0 to 20.4 m (67 ft)
  • 0 to 29 psi
  • 0 to 200 kPa
0 to 50.9 m (167 ft)
  • 0 to 72.5 psi
  • 0 to 500 kPa
0 to 102 m (334.5 ft)
  • 0 to 145 psi
  • 0 to 1000 kPa



Requires a micro USB cable and HydroSci software running on a computer with Windows XP or later. HydroSci software is available for download.


HydroSci v.1.2.1 (41.7 MB) 10-09-2017

HydroSci is used to configure and extract data from the CRS45X Recording Submersible Pressure Transducer and the OBS-3A Turbidity and Temperature Monitoring System.

Watch the Video Tutorial: Using HydroSci software with water-level recording sensors.

View Update History

HydroSci Chinese Language v.1.2 (434 KB) 01-30-2017

Adds Chinese language support for version 1.2 of HydroSci.

Note: Language support for the above listed version only.

Frequently Asked Questions

Number of FAQs related to CRS451: 1

  1. The CRS451 and CRS456 are unvented and monitor sealed gage pressure. For maximum accuracy, the data should be corrected for barometric pressure. The barometric pressure data from a nearby weather station or other monitoring platform can be used.

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