VIBRATING WIRE PIEZOMETER
MODEL EPP-30/36V

Important features:

	Reliable, accurate, low cost and simple to read.
	Protected against lightning spikes.
	Easy installation in standpipes, pressure vessels & ideal for underground work.
	Hermetically sealed under a vacuum of 0.001 torr
	Stainless steel construction.
	Readily adaptable to dataloggers

Encardio-rite piezometer incorporates the latest vibrating wire technology to provide remote digital readout of fluid and/or water pressure in standpipes, bore holes, embankments, fully and partially saturated natural soils, rolled earth fills and the interface of retaining structures. The piezometer is used to measure ground water pressure in soil, earth/rock fills, foundations and concrete structures. It provides significant quantitative data on the magnitude and distribution of pore pressure and its variation with time for design improvement. It also helps in evaluating the pattern of seepage, zones of potential piping and the effectiveness of seepage control measures undertaken. It helps in monitoring behaviour after construction and indicates potentially dangerous conditions that may adversely affect the stability of a structure, its foundation and appurtenant.

The piezometer basically consists of a magnetic, high tensile strength stretched wire, one end of which is anchored and the other end fixed to a diaphragm which deflects in some proportion to the applied pressure. Any deflection of the diaphragm changes the tension in the wire, thus affecting the resonant frequency of the vibrating wire. The resonant frequency at which the wire vibrates can be accurately measured by a conventional readout unit to give the pore pressure at any given time.
The Encardio-rite model EPP-30/36V piezometer is well known for its long term stability. This is achieved by many factors some of which are listed below:

	Individual pressure & thermal cycling of each sensor.
	Unique method of wire clamping.
	By generating and maintaining a vacuum of 1/1000 torr inside the sensor by electron beam welding which results in effect of oxidation, moisture, environmental conditions and any ingress of water being completely eliminated.
	By selecting standardised and proper materials for manufacture.

EPP-30/36V specifications:

Range (kg/cm2):	3, 5, 10, 20, 35, 50, specify
Temperature limit
Operational:	-20 to 700C
Compensated:	0 to 550C
Coil resistance:	120 -140 Ohm nominal
Humidity effect:	Nil (0 - 100 % RH)
Insulation resistance:	Better than 500 M Ohm at 12V
Over range limit:	150 % of range
Over range effect:	± 0.1% fsd upto 120%
Vibration effect:	Nil (1g, 50 - 500 Hz)

VIBRATING WIRE UPLIFT PRESSURE METER
MODEL EPU-20/26V

The uplift pressure meter is of the same construction and specifications as the piezometer described above. The piezometer is provided with a ceramic or sintered metal filter with an 'O' ring and locking nut to hold it in position. In the uplift pressure meter, this assembly is replaced by a ½" BSP adapter for direct installation at the top of the uplift pressure pipe embedded inside the structure. The height from the bottom of the uplift pipe to where the meter is mounted, should be added to the reading on the meter to get the correct pressure at the bottom of the uplift pipe.

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