The SGE-25 Hydrostatic level probe is applicable to measure liquid levels in tanks, deep wells or piezometers. The probe measures liquid levels, basing on a simple relationship between the height of the liquid column and the resulting hydrostatic pressure. The pressure measurement is carried out on the level of the separating diaphragm of the immersed probe and is related to atmospheric pressure through a capillary in the cable. when lowered  to the reference  level , the probe may either hang freely on the cable or lie on the bottom of the tank, The cable with the capillary can be extended using a standard signal cable. The cable connection should be situated in a non hermetically sealed box (The  internal pressure inside the  box should be equal to the atmospheric pressure), preventing water or other contaminats from getting in to the capillary.
 

SPECIFICATIONS:
Overpressure   :   ranges 1 m H2O   (40 x range) ranges up to  4 m H2O ( 25 x range) ranges up to  500 m H2O (10 x range max 700m)
Accuracy (BFSL) :    0...1 mH2O  : 0,3% f.s. 0....4m H2O : 0,15% f.s. 0....10 mH2O 0...500 mH2O   0,1% f.s.
Thermal error  : typical 0,3%/10° C (up to  4 m/H2O) typical 0,2%/10° C  (up to 500 m/H2O)
Compensated temperature range: 0 ....25°C
Fluid temperature:      -25....+50° C  for ranges  > 20 m/H2O -25.....+75°C   for ranges< 20 m/H2O
Output : 4-20 mA
Power supply: 10,5 - 36 Vcc
Rating: IP 68
Cable Material : polyurethane
Probe Material:  316 L SS
Diaphragm material: Hastelloy C276