FAQ#039 – 4G/3G Router: which to choose?
In order to connecting to OMNIAlog using the Internet, it is necessary to install a 3G router inside the OMNIAlog box and to insert a SIM card (with APN) into the router. This card should be Internet enabled (SIM card not included). DUTIES: 1 – Dynamic IP traceability 2 – Incoming traffic block (it depends from the […]
FAQ#038 – Do I have to power the TEL-310S before start to set-up and use it?
If the TEL-310S was supplied 2 or more month before, will be better to power it for 8 hours before starting to set-up and use it. This is to recharge the back-up battery that give troubles if it is completely discharged.
FAQ#037 – Which is the linear thermal expansion coefficient of the graduated flat cable (tape) of Water Level Indicators (WLI) and BRS settlement probes?
The linear thermal expansion coefficient of the flat graduated cable is 16x10E-6 m/ °C.
FAQ#036 – Which is the right mix for inclinometer casing grouting?
There is not an exact ratio for each kind of soil. It depends from many factors that could change for every geological and geotechnical situation. Anyway the grouting should be similar to the soil even if is not really possible to match both characteristics. Approximate Cement/Water/Bentonite mix ratio are: – for hard and medium soil: […]
FAQ#034 – Is possible to repair/change the manometer without disassemble the load cell?
It is not possible to repair/change the manometer without disassemble the load cell. The scope of the glycerine inside of the manometer display is only to show eventual tampering of the manometer. The load cell work properly without glycerine, too.
FAQ#033 – I have received the calibration Report of a piezometer. There is not the K Thermal Factor noted. In which way may I proceed?
If the value is not indicated in the Calibration Report, you should use this formula: K = -1 digit/°C For each degree of increase of temperature you should reduce 1 digit.
FAQ#032 – Which is the reading method of the new generation of SISGEO vibrating wire readouts and loggers?
For VW sensors Sisgeo has developed automatic algorithms to search for the resonant frequency in case of environmental noise or poor signal. In this way you can distinguish between the natural frequency of the sensor and the frequency of the noise, thereby reducing measurement errors and false alarms. This method also provides improvement in the […]
FAQ#031 – Is the DEX system suitable for in-place applications?
DEX system has been designed for automatic soil settlement monitoring (vertical movement) in unattended location. DEX system consists of a string of DEX probes installed in borehole within a ABS inclinometer casing. DEX-S, the combined inclinometer-settlement probe, provides both horizontal movements (X, Y-axis) and vertical settlement (Z-axis) for 3-D borehole automatic profile monitoring.
FAQ#030 – Why do the NATM pressure cells have repressurizing tubes?
NATM pressure cells are normally used to measure tangential and radial stresses in concrete tunnel lining. They are embedded in concrete and after curing the cell shall be repressurized to mantain the intimate contact between the pessure pad and the surrounding material.
FAQ#029 – What is the Real Gauge Factor reported in the Specifications and Compliance Certificates of both VW embedded and arc-weldable strain-gauges?
The gauge factors for VW strain-gauges are generic factors calculated from the dimensions and the physical properties of the gauge material. The VW strain-gauges arep roduced in series with industrial method, so each strain gauge is equal to the other: it means that the gauge factor of VW strain gauges do not change. The Gauge […]
FAQ#028 – Are the vibrating wire strain-gauges and spot weldable VW strain gauges equipped with temperature sensors?
Yes, vibrating wire strain-gauges, as well as all other Sisgeo’s vibrating wire instruments, are equipped with a built-in NTC thermistor YSI 44005 type (3000 Ohm at 25°C). Thermistor is included in the instrument price and therefore there is not additional cost for it.
FAQ#027 – Which type of damping fluid is recommended for filling the pendulum tanks?
We recommend to use the following mineral oil with selected viscosity: SAE 50-90 for direct pendulums SAE-10 for inverted pendulums.