foto assistance sisgeo1150 320

Rissmeter und Fugenmesser

 
FAQ#111 - Why I cannot read correctly my 4-20mA current loop gauge?

It could be a problem connected to the power supply given by the readout or logger. When the power supply is in the current loop (2-wire gauge) it is necessary to consider the effect of voltage drop across the shunt resistor on the voltage applied to the gauge.

For example, suppose a 4-20mA gauge requires at least 12 V to operate correctly and the readout powered with 16 V. The voltage the gauge sees is the voltage supplied by the readout minus the voltage drop in the rest of the current loop. At 20 mA output, the voltage drop across the commonly used 100 ohm resistor is 2 V.

When the voltage supplied by the readout is 16 V, this leaves 14 V for the gauge and everything is fine.
However, if the readout is powered with less than 14 V, at 20 mA current it will leave less than 12 V for the gauge. In this case, the output of the transmitter may be in error.

Draht-Extensometer
Analoges Ketteninklinometer
Draht-Fugenmesser
System Setzungsmesssystem
MPBX - Mehrfach-Bohrlochextensometer
MEXID Miniatur-Mehrfach- Bohrlochextensometer
Setzungspegel
Elektrische Ankerkraftmessdosen
Erddruckmessdosen
Elektrische Kraftmessdosen
Rissmeter und Fugenmesser
Mini OMNIAlog 4-Kanal Datenlogger
Flachpresse (Flat jack) Testapparatur
Resistive Kraftmessdosen für Pfahllastversuche
H-Level-Messsystem
Convergence extensometer (DISCONTINUED)
Piezo-Resistive piezometers
Vented pressure transducers
Removable Pressure Transducers
Titanium Piezometers
Drive-in Piezometers
Analoges Tiltmeter

 
FAQ#110 - What's the purpose of the linear and polynomial factors written in the Calibration Reports?

Utilize the Linear Sensitivity Factors (A, B) and Ploynomial Sensitivity Factors (A, B, C, D) of the Calibration Reports permit to obtain readings in engineerig units with a maximum error as for the Calibration Report.

In the case of analogue gauges, the factors shall be applied on the electrical readings (i.e. mA, mV, digit, etc...)

In the case of digital gauges in "Legacy mode" (digital gauges with FW version 0.X, 1.X, 2.X or 3.X), the factors shall be applied on the output in engineering units (i.e. sin angle, kPa, etc...)

In the case of digital gauges in "Normal Mode" (digital gauges with FW version 3 or higher), the factors are already applied inside the gauge, so the Sensitivity Factors shall not be utilized with these instruments.
NOTE: all the new digital gauges are in "Normal mode".

For more information regarding SISGEO Calibration Report, refer to the following video https://youtu.be/BF8e3ZRcaYU

For more information on "how to use" the Sensitivity Factors with analogue gauges and with digital gauges in Legacy Mode, refer to the instruments manuals or to the following document: https://www.sisgeo.com/uploads/manuali/Addendum_data_processing/ADDENDUM_-_DATA_PROCESSING_-_EN_00.pdf

 

 

LT-Inclibus
MD-Profile system

 
FAQ#077 - Which are the maximum cable lengths from instrument to datalogger?

 

 

 

The cable lengths depend from many factors, first of all installation and cable protections (screen, earth, etc...). Assuming that instruments are installed in a workmanlike, for the maximum cable lengths should be followed the next suggestions:

DIGITAL INSTRUMENTS: see FAQ#073

ANALOGUE INSTRUMENTS: see both documents:

Cable length guide line with internal multiplexers
Cable length guide line with external multiplexers

 

LT-Inclibus
MD-Profile system