FAQ#019 – Which is the difference between HAE (high-air entry) and LAE (low-air entry) filters?
HAE (High air entry) filters are normally used to monitor pore pressure in the clay core dams and saturated low permeability soils. “High air entry” means high-resistance to air entry when the filter is saturated. The surface tension of the water in the very fine porus of the filter prevents entry of air. The HAE […]
FAQ#018 – What kind of overvoltage protection is built in the vibrating wire piezometers?
A plasma surge arrestor is wired in parallel with the coil (which is used to pluck the wire). The nominal impulse discharge current 8-20 microsec interval is 10 KA. Impulse spark-over voltage at 1Kv/ microsec: 700 V.
FAQ#017 – Can we buy spare parts for replacement of the water level indicator probe and repair it ourselves?
Yes, we sell a kit which includes instructions, probe, weights, rexin, and any other parts.
Puerto Cabello-La Encrucujada railway project, Venezuela
The section Puerto Cabello – La Encrucijada (Cagua) is part of a more multi-modal and articulated transportation network of freights and passengers. During the first stage of works, the above said section will connect the principal port of the country (Puerto Cabello) to the industrial, agricultural and food poles of Valencia and Maracay. The next […]
FAQ#016 – Are the vibrating wire piezometers equipped with temperature sensors, or is the temperature sensor an option?
Yes, each vibrating wire piezometer, as every Sisgeo vibrating wire instrument, is equipped with a built-in NTC thermistor YSI 44005 type (3000 Ohm at 25°C). Thermistor is not a option for vibrating wire instruments and therefore there is not additional cost for it.
FAQ#015 – The anchor load value displayed on the load cell manometer or readout does not agree with load calculated by the hydraulic jack. What’s right?
The main factors which influence the anchor measurements are: – axial misalignment of the jack– difference in diameter between the jack and the load cell. These factors cause bending of the bearing plate between the load cell and the jack and affects the response of the cell. To minimise this effect use the genuine distribution […]
FAQ#014 – What is the multipoint settlement system to monitor settlement in embankment fills and foundation soil?
The multipoint settlement system consists of four main components: a string of pressure gauges, a liquid filled tubes, electric cables and a reference gauge with reservoir of liquid. The pressure gauges are embedded in the soil and by tubing connected to the reference gauge which shall be located at higher elevation on a stable ground, […]
FAQ#012 – How is important the function of the grout to the operation of the spider magnets?
The arms of the spider only keep the magnet in place while grouting, but the grout couples the magnet to the surroundig soil. Grout mix shall be controlled (ratio water/cement) during grouting operation according to the soil application.
FAQ#011 – Are the air bubbles present in the liquid mix cause of errors?
Sisgeo liquid mix is de-aired at factory and it is supplied sealed in special tank. However in the DSM reference gauge there is a high sensitive sensor which is able to monitor the weight of the liquid within the reservoir. In the case of the air bubbles come over decreasing the level of the liquid […]
FAQ#010 – Which is the freezing temperature of the Sisgeo liquid mix for H-Levels LLS and Multipoint Settlement Systems system liquid?
Sisgeo liquid is a de-aired water-glycole mix (70% – 30%). The freezing temperature is about -15°C.
FAQ#009 – Can the TEL-310S functioning be influenced from atmospheric conditions?
Any factor (water, mud etc.) that could dirty the internal part of the “SUS” optical sensor unit’s cover can influence the TEL-310S correct functioning. So it is essential to protect properly the “SUS” optical sensor unit from weather conditions, leaving anyway the access possibility for cleaning/maintenance. In any case, TEL-310S has an auto-diagnostics able to […]
FAQ#008 – What is the 0TEL310CAL0 calibration/mounting kit and what is it for?
The 0TEL310CAL0 kit includes a drilling template for the wall where the “ANS” support will be placed, and a template to be placed on the “SUS” optical sensor unit for a possible functional check on field (pendulum’s wire simulation).