Model 2100
Nold DeAerator™
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.
| Specifications | |
| Standard Capacity | 6, 8 liter |
| Power Supply | 120 V 60 Hz or 240 V 50 Hz |
| Power Consumption | 14 watts |
| Vacuum Requirements | 750 mm Hg, (12 Torr), or better |
| Degassing Purity | 0.6 ppm |
| L x W x H | (6 liter) 190 × 190 × 510 mm (8 liter) 190 × 190 × 600 mm |
Model
3400, 3410 Semiconductor Piezometers and
Pressure Transducers
The Model 3400 Semiconductor Piezometers and Pressure Transducers are
intended for dynamic measurements of fluid and/or pore water pressures
in standpipes, boreholes, embankments, pipelines, pressure vessels,
reservoirs, etc. They are also used for static pressure movement where
the readout system is incompatible with vibrating wire type transducers.
Three transducer output options are available.
| Specifications | |
| Standard Ranges | 0.1, 0.15, 0.25, 0.4, 0.6,
1.0, 1.6, 2.5, 4.0 MPa |
| Over-Range | 2 × rated pressure |
| Output | 10 mV/v, 4-20 mA, 0-5 V |
| Accuracy | ±0.25% F.S. or better |
| Linearity | < 0.5% F.S. |
| Temperature Range | –20°C to +80°C |
| Length × Diameter | 194 × 32 mm |
Model
3800 Thermistor Probe
The Model 3800 Thermistor Probe consists of an interchangeable thermistor
bead mounted inside a rugged PVC (Model 3800-1) or stainless steel (Model
3800-2) housing. They are used for remote readings, such as measuring
hydration and cooling temperatures in placement of mass concrete.
| Specifications | |
| Standard Range | –50°C to +150°C |
| Sensitivity | 0.1°C |
| Accuracy¹ | ±0.5°C |
| Temperature Range | –20°C to +80°C |
| Length × Diameter | 50 × 12 mm |
| ¹Accuracy of ±0.2°C available on request. | |
Model
3810 Thermistor String
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.
| Specifications | |
| Standard Range | –50°C to +150°C |
| Sensitivity | 0.1°C |
| Accuracy¹ | ±0.5°C |
| Temperature Range | –20°C to +80°C |
| ¹Accuracy of ±0.2°C available on request. | |
Model
4700 VW Temperature Gage
The Model 4700 VW Temperature Gage 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.
| Specifications | |
| Standard Range | 100°C (–20°C to +80°C) |
| Optional Range | 200°C (–200°C to 0°C or 0°C to +200°C) |
| Sensitivity | 0.034°C |
| Accuracy | ±0.5% F.S. |
| Length × Diameter | 127 × 19 mm |
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.
| Specifications | |
| Conductors | 22 AWG (stranded 7 × 30 AWG) tinned copper |
| Conductor Insulation | Polypropylene, 10-Mil high density, color coded |
| Shielding | Aluminum
polyester with drain wire, |
| Jackets¹ | Extruded PVC standard (–20°C to +80°C), Teflon (–80°C to +200°C), Polyethylene, Polyurethane, and Armored Polyethylene |
| Temperature Range | –20°C to +80°C |
| ¹Other cable jackets are available for special applications. | |