Pressure Transducers • Weir Monitors
 
Photo of 4500H  

Model 4500H/4500HH Pressure Transducer
The Model 4500H/4500HH Pressure Transducer is supplied with a 1/4 -18 NPT male or female pipe thread fitting to permit the transducer to be coupled directly into hydraulic or pneumatic pressure lines. Other pipe thread sizes are also available.*

Specifications  
Standard Ranges

(H)
(HH)

350, 700 kPa; 1.0, 2.0, 3.0 MPa
5.0, 7.5, 10, 25, 50, 75, 100 MPa
Over Range 2 x rated pressure
Sensitivity   0.025% F.S. (minimum)
Accuracy ±0.1% F.S.
Linearity < 0.5% F.S. (±0.1% F.S. optional)
Temperature Range¹ –20°C to +80°C
Length x Diameter (H)
(HH)
140 x 25.4 mm
143 x 25.4 mm

¹High temperature versions available on request.


Photo of 4580

 

Model 4580 Pressure Transducer
The Model 4580 Pressure Transducers are designed for very low fluid pressure measurements, such as groundwater elevations in wells, water levels in streams, weirs, flumes, etc. Changes in water levels of as little as 0.2 mm can be measured. Sealed and evacuated types can be used as a barometer to measure atmospheric pressure changes.*

Specifications  
Standard Ranges 200 Mbar¹ (barometer);
7, 17, 35 KPa
Over Range 2 x rated pressure
Sensitivity² 0.025% F.S.
Accuracy ±0.1% F.S.
Linearity < 0.5% F.S. (±0.1% F.S. optional)
Temperature Range –20°C to +80°C
Length x Diameter 110 x 63.5 mm (barometer);
165 x 38, 165 x 63.5 mm
¹Other ranges available on request
² Depends on readout system

Photo of 4675LV  

Model 4675LV Weir Monitor
The Model 4675LV water level monitoring system uses a vibrating wire force transducer to provide a highly stable and sensitive means of monitoring water levels. The main component is a cylindrical weight suspended from the force transducer. The cylinder hangs partially submerged in the water whose level is to be monitored. As the water level changes the changing buoyancy force on the cylinder acts directly on the vibrating wire transducer and alters its tension and hence its resonant frequency. The frequency is measured either by the GK-403 portable readout, the MICRO-10 Datalogger or the Model 8001 Single Channel Datalogger.

Specifications  
Standard Ranges¹ 300, 600, 1500 mm
Sensitivity 0.02% F.S. (minimum)
Accuracy ±0.1% F.S.
Linearity < 0.5% F.S.
Stability ±0.05% F.S. per year
Temperature Range² –20°C to +80°C
Length x Diameter (transducer) 165 x 25 mm
¹Other ranges available on request
²Using antifreeze solution can extend the range below 0°C

Please Note:  

*All Davisson vibrating wire pressure transducers include tripolar plasma surge arrestors to protect the sensor coils from possible lightning damage. Semiconductor pressure transducers are also available (see 3400 Series).