Long term stability is ensured in the model EPP-30V (MTI.EWS.ER.M-EPP30V) pore pressure meter by:
• Pressure and thermal cycling
• Unique method of wire clamping
• By generating a vacuum of around 1/1000 Torr inside the sensor by electron beam welding.
This results in effect of oxidation, moisture, environmental conditions and any ingress of water being completely eliminated.
The pore pressure meter is individually temperature compensated making the requirement of a thermistor for temperature correction redundant. However a thermistor is provided for monitoring temperature.
Piezometer Model EPP-30V
• Sensor Type: Vibrating wire
• Range (MPa): 0.2, 0.35, 0.5, 0.7, 1.0, 1.5, 2.0, 3.5, 5.0, 10.0, specify
• Accuracy : ± 0.25 % fs standard | ± 0.1 % fs optional
• Non-linearity : ± 0.5 % fs
• Over range limit: 150 % fs of range
• Temperature limit: -20° to 80°C
• Thermistor: YSI 44005 or equivalent
• Dimension (Φ x L): 42 x 185 mm
• Parameter: Water level/pore pressure
• Protection (Waterproofing) : IP-68, water resistant up to its full range
• Key Testing / Calibration:
-Thermal cycling (-20 to +80°C)
- Pressure cycling (2000 cycles), individually temperature compensated, reverse pressure test, individually calibrated providing high accuracy & repeatability
• Key Feature/Advantage: Hermetically sealed with electron beam welding
• Insulation resistance: Better than 500 MOhm at 12 V
• Enclosure: Stainless steel - standard, Saline protection - optional