Campbell Scientific CRS451/CRS456 Submersible Water-Level Recording Sensor - Manual (Page 10)

CRS451/CRS456 Submersible Water-Level Recording Sensor
Freezing conditions may damage the CRS451/CRS456
(see Section 6.2, Avoiding Freezing Conditions, for more
information).
Body Material
CRS451: 316L Stainless Steel
CRS456: Titanium
Element Material
CRS451: 316L Stainless Steel
CRS456: Hastelloy ®
Standard Cone Material: Delrin ®
Weighted and NPT Material: Stainless Steel
Dimensions
Length: 22.23 cm (8.75 in)
Diameter: 2.22 cm (0.875 in)
Weight: 230 g (0.51 lb)
1 The CRS451 is a sealed gage sensor and when not submerged will read
approximately 1 bar at sea level and less as elevation increases. The CRS451
is calibrated at 9 pressures starting at 0.6 bar up to full scale referenced to 1
bar. Points below 1 bar are used in the calibration for the benefit of those who
deploy this sensor at elevations above sea level.
2 The accuracy specification listed pertains to the level of accuracy that the
CRS451/CRS456 is able to measure pressure. If a barometric pressure sensor
is used to remove the component of atmospheric pressure from the pressure
reading provided by the CRS451/CRS456 while submerged in a column of
water vented to the atmosphere, the error of the barometric sensor must be
considered when calculating the resulting accuracy of the water level reading.
3 Total Error Band (TEB) includes the combined errors due to nonlinearity,
hysteresis, nonrepeatability, and thermal effects over the compensated
temperature range, per ISA S51.1.
6. Installation
The CRS451/CRS456 is designed for water level measurements. Typical
applications include agricultural water level/flow, water wells, lakes, streams,
and tanks. If the device is to be installed in a liquid other than water or in
contaminated water, check the compatibility of the wetted material. The
CRS456 should be used in harsh water applications, including salt water.
6.1 Appropriate Depth
The CRS451/CRS456 must be installed below the water at a fixed depth. This
depth should be chosen so that the water pressure will never exceed the
transducer’s pressure range (twice its pressure rating).
CAUTION
4