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ii 

4.1

 

R

EADING THE 

FOP ...................................................................................................................... 20

 

4.2

 

E

XAMPLE

 ..................................................................................................................................... 20

 

4.3

 

D

ETERMINATION OF THE 

G

AUGE 

F

ACTOR

 ................................................................................... 21

 

5

 

TROUBLESHOOTING .................................................................................................................... 22

 

5.1

 

F

IBER OPTIC READOUT UNIT

 ......................................................................................................... 22

 

 

Battery charge and discharge cycles for portable readout unit ............................................. 22

 

 

Cleaning the connectors ......................................................................................................... 22

 

5.2

 

F

IBER OPTIC PIEZOMETERS TROUBLESHOOTING

 ........................................................................... 23

 

 

Diagnostic and error messages .............................................................................................. 23

 

5.3

 

O

THER TROUBLES

 ........................................................................................................................ 25

 

6

 

MISCELLANEOUS .......................................................................................................................... 25

 

 

 

Содержание FOP

Страница 1: ...misuse is potentially dangerous The Company makes no warranty as to the information furnished in this manual and assumes no liability for damages resulting from the installation or use of this produc...

Страница 2: ...ETERS USING UNIQUE GAUGE FACTOR 8 2 6 POLYNOMIAL PRESSURE EQUATIONS FOR FOP MICROPZ AND FOP PZ PIEZOMETERS 9 Equation with temperature compensation 10 2 7 LINEAR PRESSURE EQUATION FOR PIEZOMETERS WITH...

Страница 3: ...CTOR 21 5 TROUBLESHOOTING 22 5 1 FIBER OPTIC READOUT UNIT 22 Battery charge and discharge cycles for portable readout unit 22 Cleaning the connectors 22 5 2 FIBER OPTIC PIEZOMETERS TROUBLESHOOTING 23...

Страница 4: ...the gauge is under pressure there is a variation of the Fabry Perot cavity length made by the inner surfaces of the stainless steel diaphragm on one side and the tip of an optical fiber on the other s...

Страница 5: ...Both high and low air entry filters are available Model FOP F The model FOP F piezometer is a thick wall version of the FOP piezometer with an outside diameter of 25 4mm Model FOP MicroPZ and FOP PZ T...

Страница 6: ...h each gauge lists the following Serial number Gauge factor and or calibration factors Working pressure in bar or psi Temperature at time of factory calibration Barometric pressure at time of factory...

Страница 7: ...eter 50 m Ceramic filter high air pressure entry pore diameter 1 m Filter generally used Filter usually installed for use in unsaturated fine grain material Does not allow suction measurements If wate...

Страница 8: ...3 mm outside diameter Filter Stainless steel 316 porosity 40 m 1 5FOP PZ SPECIFICATIONS Range 100 200 350 standard range 500 750 1000 kPa Accuracy1 0 5 F S Resolution 0 065 F S Overload 1 5x F S Outer...

Страница 9: ...ppropriate gauge factor pre selected the reading will indicate 0 or a very small value Obviously the transducer should not be submitted to pressure for a true zero reading and should be stabilized in...

Страница 10: ...readings to ensure a stable value is recorded This is the initial reading Record ambient and water temperature barometric pressure and the initial reading and diagnostic value of the sensor See secti...

Страница 11: ...present at time of factory calibration are eliminated The function check can be made relative to barometric pressure or to a difference of piezometric head in the pipe In both cases barometric pressu...

Страница 12: ...0 1 002 1 013 Pcorr 4 500 0 007 0 011 4 504 bar 2 6POLYNOMIAL PRESSURE EQUATIONS for FOP MicroPZ and FOP PZ Piezometers For piezometers FOP MicroPZ and FOP PZ with polynomial equation you should assig...

Страница 13: ...apply barometric corrections Pcorr Prec B1 B0 Where Pcorr Corrected pressure in kPa Prec Pressure previously calculated in kPa see above Bo B1 Initial at installation and current barometric pressure...

Страница 14: ...Prec0 99 56 kPa Note that the calibration in factory is done compared to the zero absolute that explains the initial value of 14 44 psi although there is no pressure applied to the sensor This value s...

Страница 15: ...ord always the reading in raw units in nanometers nm The calibration factor CF is obtained using a linear regression Then to convert changes in readings internal unit in nm to changes in pressure use...

Страница 16: ...ted soils Low air entry sintered stainless steel filters The filter on the FOP piezometer body is removed by holding the piezometer in one hand and pulling and twisting the filter housing with the oth...

Страница 17: ...ded With the water temperature ambient temperature and piezometer temperature in equilibrium raise the piezometer by the cable until it is out of the water about two centimetres We recommend to take t...

Страница 18: ...cult to obtain 3 3INSTALLATION IN FILL Compacted clay Excavate a trench or recess about 30 cm deep by about 0 8 m2 Form a cylindrical hole in the side wall of the trench The hole diameter should be sl...

Страница 19: ...the cable taut to prevent the bentonite from hooking up in the casing Pour the bentonite slowly in the hole to avoid bridging A brush or a thirty centimetre layer road salt can be used to unplug a bl...

Страница 20: ...nate way to install piezometers in boreholes is to fill the entire borehole with grout after having lowered the instruments This method known as the Fully Grouted Borehole Installation is peculiar in...

Страница 21: ...ct zones are generally installed in shallow boreholes to protect them against concentrated loads or movements Run cables emerging from these holes through the dam core and locate the vertical to horiz...

Страница 22: ...ioning 4 Relation between gauge factor and calibration factor The Gauge Factor GF is specific for each pressure sensor and is written on the fiber optic cable near the connector It gives the relations...

Страница 23: ...seful to have the Fabry Perot cavity distance in nanometers To do so the gauge factor 0001000 known as the Default Gauge Factor must be enter in the readout unit instead of the sensor gauge factor gen...

Страница 24: ...nm Pressure calculation psi psi nm nm 0 200 192 5 5 1038 4 3Determination of the Gauge Factor Finally it can be shown that the Gauge Factor can be determined from the Calibration Factor by the followi...

Страница 25: ...TANT WARNING Waiting for a complete discharge is not recommended Completely discharging the battery strongly reduces its lifespan Make sure to fully recharge the battery before storing the FTI 10 for...

Страница 26: ...you take a reading with a fiber optic piezometers and a readout unit we recommend to complete also a diagnostic of the sensor using the diagnostic function With the diagnostic function DIAG the user c...

Страница 27: ...connector Cable is damaged Verify if the cable is not damaged or cut Check if the same troubles No signal occur with other instruments connected If so the readout unit may be suspected and the factory...

Страница 28: ...ated with recorded temperature and barometric pressure Check if corrections to raw pressure are applied correctly Try to perform a calibration on site and contact Roctest with reading for evaluation 6...

Страница 29: ...methods of recording and the protection of piezometers A 6 Clements D J and A C Durney 1982 Instrumentation Developments proceedings of the Autumn Conference on the British National Committee on Large...

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