level Pressure Transducers
Water Level Logger (WLL)
seepage measurements weir Monitoring
The model P252R is a level transducer equipped with a relative vented piezoresistive pressure sensor which provides automatic compensation of the barometric changes. This transducer provides ground water table monitoring in standpipe and Casagrande piezometers.
Water Level Logger (WLL) is an integrated system designed for automatic monitoring of water level and temperature inside wells, standpipes and Casagrande piezometers. WLL with its integrated datalogger must be programmed and lowered in the open pipe below the water level. It has to be periodically retrieved for downloading data.
V-notch weirs are typically installed in open channels such as streams to determine discharge (flowrate). The basic principle is that the discharge is directly related to the water depth above the bottom of the “V”. Leakage measuremenst is one of the most important indicators of the overall performance of dikes and dams.
TECHNICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
V-NOTCH WEIRS
Standard ranges
100, 200, 500 kPa, 1.0 MPa
Water level range*
4, 9, 30, 76 m of water
The purpose of the weir is to transform the instantaneous flow
Signal output
4-20 mA (current loop)
Temp. measurem. range
-20°C +50°C
values into the pressure/level by means of specific measuring
Sensitivity
0.01% FS
Accuracy:
Total accuracy (*)
< 0.25% FS
- water level**
±0.05% F.S.
Power supply
12 - 24 Vdc
- temperature
±0.5°C
Overload
30%
Memory type
Non-volatile
Thermal zero shift
0.00025 % /°C
Memory capacity
64k-byte
Temp. Operating range
-10°C +55°C
Filter unit
syntherized stainless steel
Body material
stainless steel
Diameter / length
28 mm / 200 mm
Communication port
Optical USB interface
Cable
0WE203KEO00
Diameter / length
24.6 mm / 150 mm
Battery life
5 years typical with min.
equipment. 0QV45LS1000
10 litre/sec, V-angle 45°
0QV60LS2000
20 litre/sec, V-angle 60°
0QV90LS5000
50 litre/sec, rectangular V-notch weirs are preferred for
>21.000 combined measurements Measuring Interval
low discharges as the head above
Programmable
the weir crest is more sensitive
min 1 sec, max 18 hours
measuring interval 1 min.
to changes in flow compared to rectangular weirs.
0QVLIV10000 LEVEL TRANSDUCER
* nominal value based on using WLL at sea level ** typical error using reference level measurement and
Transducer type
Accessories
0WSBHW10000 manager software
support head
Lockable support head assembly
This software permits to check the logger status: verify logger
0P200CH1000
with data plate. Positioned on the
set-up before launch, verify logger operation while logging,
top of the standpipe permits to
display real-time sensor readings and display memory used and
suspend the transducer by a secure
battery voltage. Software’s powerful graphing features allows
cable stop.
plot and filter data for a customized data presentation.
floating unit with high sensitivity load cell
the barometric compensation Measuring range
1000 mm of water level
Sensor resolution
1 mm
Accuracy
< 0.3% FS
Output signal
4-20 mA (current loop)
0P251Q10000 LEVEL TRANSDUCER Transducer type
pressure transmitter
Measuring range
1000 mm of water level
VENTED BOX
Vented IP67 plastic box equipped
Accuracy
< 0.5% FS
0EPDP002W00
with overvoltage protections and
Output signal
4-20 mA (current loop)
cable glands.
STAFF GAUGES (*) including hysteresis and repeatability, calculated with 3rd
0QVHI030000
300mm long, millimetre division
degree polynomial
0QVHI050000
500mm long, millimetre division
sisgeo.com
piezometers
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