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3. Instruments for water level measurement


  

Group 7: Precipitation, Evaporation, Level

40xxx

 

 

 

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Water Level Pressure Sensor     
The sensor type 7510 is designed to measure water level of lakes, rivers, reservoirs etc.,  as well as ground water level. The probe is normally installed in a tube, ≥ 2”.  The  included clamping bracket, attached to the suspension cable, serves for adjustment of  the measuring depth. The water level is measured by means of a ceramic differential  pressure sensor, comparing the actual water pressure with the ambient air pressure. For  this purpose the ambient air is linked to the sensor by means of a hose placed in the  core of the suspension cable.  

7510.1000 
Water level sensor, class 0.25 %
7510.2000 
Water level sensor, class 0.1 % 
Meas. ranges:
0...1 m to  0...250 m  (specify with order))           
Accuracy:



0,25 % FS   
(type 7510.1000) resp.   
0.10 % FS   
(type 7510.2000)             
Output:
4...20 mA, 2 line     
Power supply:
24 V DC 
Housing:
Stainless steel, 1.4571 
Sensor: CERTEC Ceramic     
Suspension cable:
PE, 12 m length (Standard);   
other lengths  up to 200m  upon request         
Clamping bracket:
Stainless steel, 1.4305,    max. ∅ 52 mm     
Dimensions: ∅ 32 x 181 mm length.     
Weight:
approx. 1.50 kg 

Calibration device, cable connection box and further accessories:
upon request    
  





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Type-No.: 7520.0000
Water Level Radar Sensor 
with horn antenna, for indirect measurement of water level of lakes, rivers, reservoirs  etc. by determination of the distance between water level and a fixed sensor position  above (e.g. at a bridge), using the principle of Radar reflection from the water surface.  Continuous measurement by means of 26 GHz technology. 

Meas. range:

0.05...15 m (distance through air)   
other ranges upon request   
Resolution:
max. 1 mm 
Accuracy:

± 3 mm within 0.5...15 m under reference conditions by    IEC 60770-1 
Output:
4...20 mA, 2  line 
Meas. interval:
approx. 1 s 
Power supply:
24 V DC 
Housing:

PBT (Polyester),    
other materials upon request 
Antenna:
18°; ∅ 48 mm; stainless steel, 1.4435 
Fastening:
G 1 1⁄2“ thread 
Dimensions:
Length: 292 mm, max. width: 107 mm 
Weight:
approx. 2.50 kg 

Display module and calibration accessories upon request   





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Type-No.: 7530.0000
Water Level Sensor with built-in Datalogger
consisting of a pressure sensor, similar to type 7510, with integrated datalogger and a  Li  – battery built-in a special plastic probe housing. An additional built-in NTC  –  temperature sensor enables continuous measurement and storage of water  temperature data. 
The probe is normally installed in a tube,  = 2”.  The included clamping bracket,  attached to the suspension cable, serves for adjustment of the measuring depth. The  suspension cable also features to link the ambient air to the sensor by means of a hose  placed in the core of the cable.  A readout software is included.   

Meas. range:

Water level:              10 m resp. 20 m (specify with order)   
Water temperature:  –5...+45°C   
Accuracy:

Water level:              0.10 % FS   
Water temperature:  ± 0.1 K   
Data acquisition:
Datalogger with memory for 10 000 meas. values   
(circulate memory), real time clock, serial interface RS232 
Power supply:

Li – battery; life time depending on scan rate,    
e.g.  with 1h – scan rate, approx. 10 years   
Dimensions: ∅ 46 x 350 mm (housing) 
Weight:
approx. 1.20 kg 
Cable length:

10 m;   
other lengths on request 

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