Nold DeAerator™

Model 2100

De-aired water or antifreeze solutions are an essential ingredient of any hydraulic piezometer or settlement system, where the formation of air bubbles in the fluid filled tubing must be prevented. The Nold DeAerator provides a rapid means of removing dissolved gases from fluids, at a much higher rate than through conventional heating/boiling methods. The Nold DeAerator consists of a holding tank, which can be evacuated using either a vacuum pump or a water-powered aspirator. Water, (or antifreeze solution), is drawn into the tank where it is agitated violently by a rotating impeller, causing cavitation, nucleation and the rapid expulsion of the dissolved gasses. The Nold DeAerator can also be used with other fluids to remove dissolved gasses.

Thermistor Probes

Model 3800

The Model 3800 Thermistor Probe consists of an interchangeable thermistor bead (Model 3800-1-1-1) mounted inside a rugged PVC (Model 3800-1-1) or stainless steel (Model 3800-2-1) housing. They are used for remote readings, such as measuring hydration and cooling temperatures in placement of mass concrete.

Thermistor Strings

Model 3810

The Model 3810 Thermistor String comprises a number of individual 3800 sensors mounted in rugged, multi-conductor cables for multiple temperature measurements in a single borehole. Thermistor strings are manufactured according to customer requirements for overall length, number of sensors and accuracy.

Vibrating Wire Temperature Sensors

Model 4700

The Model 4700 VW Temperature Sensor consists of a stainless steel transducer body to which a vibrating wire element is attached. As the thermal coefficients of expansion of the body and wire are different, a simple, yet sensitive, temperature measuring device can be constructed. These gages are ideally suited for use in projects that require data-logging and where other types of VW transducers are in use.

Fiber Optic Temperature Sensors

Model FP4700

The Model FP4700 Fiber Optic Temperature Sensors are designed for use in environments where high levels of electrical interference exist or where intrinsic safety is an issue. The FP4700 uses the temperature-dependent birefringence of a specially selected crystal as the temperature transduction mechanism. This crystal does not show thermal creep or aging as with some other fiber optic sensors.

Cables

Geokon cables are designed for a variety of geotechnical and hydrological applications. They are waterproof, have good electrical properties and can be buried in soil or embedded in concrete. Cable construction consists of one or more shielded pairs with individual drain wires for electrical noise protection. A variety of cable jackets are available including PVC for standard applications, Teflon for use at high temperatures and Polyurethane for use in situations where extra abrasion resistance is required. Armored cables, for use in earth dams, and cables with straining wires and integral vent tubes are also available.