Hydrostatic Level Probes SGE25i/16
Any measurement range from 1 up to 500 mH2O
Integrated internal overvoltage
protection circuit
Marine certificate DNV ATEX
Intrinsic safety
The SGE-25 hydrostatic level probe is applicable to measure liquid levels in tanks, deep wells or piezometers.
The SGE-16 hydrostatic level probe is a specialized device designed to measure water levels in narrow diameter piezometers or wells.
Principles of operation, construction
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 hydrostatic level probe and is related to atmospheric pressure through a capillary in the cable.
The active sensing element is a piezoresistant silicon sensor separated from the medium by an isolating diaphragm. The electronic amplifier, which works in com- bination with the sensor, and is meant to standardize the signal, is additionally equipped with an overvoltage protection circuit, which protects the probe from damage caused by induced interference from atmospheric discharges or from associated heavy current engineering appliances.
Technical data for the SGE-25 level probe
Measuring range Any measuring range 1 ÷ 500 m H2O
The standard ranges: 4, 10, 25, 60, 100 m H2O are recommended
Any measuring range:1 ÷ 500 m H2O
| Measuring Range | |||
| 1 m H2O | 4 m H2O | 0...10 m H2O ÷ 500 m H2O | |
| Overpressure Limit
(repeatable – without hysteresis) |
40 × range | 25 × range | 10× range (max. 700 m H2O) |
| Accuracy % FSO acc. to IEC 60770 | 0,6% | 0,3% | 0,2% |
| Accuracy % FSO acc. to BFSL | 0,3% | 0,15% | 0,1% |
| Thermal error | Typical 0,3% / 10°C max 0,4% / 10°C | Typical 0,2% / 10°C max 0,3% / 10°C | |
Long term stability 0,1% or 1 cm H2O for 1 year
Hysteresis, repeatability 0,05%
Thermal compensation range 0 ÷ 40°C – standard
-10 ÷ 70°C – special version
Medium temperature range -25 ÷ 40°C – standard
0 ÷ 75°C – ETFE and PTFE version
CAUTION: The medium must not be allowed to freeze in the immediate vicinity of the probe
Technical data for the SGE-16 level probe
Measurement ranges 10 ÷ 100 m H2O Overpressure limit 10 × range (repeatable – without hysteresis)
Accuracy 0,3%
Hysteresis, repeatability 0,05%
Thermal compensation range 0 ÷ 40°C
Process temperature limit 0 ÷ 40°C (version with ETFE and PTFE cable) 0 ÷ 75°C
Electrical parameters (applicable to both probes)
Output signal, power supply:
| no | Signal type | Power supply | Available in models |
| 1 | 4 ÷ 20mA | 8…36 VDC
10,5…36 VDC (TR version) |
SGE-25/… |
| 2 | 4 ÷ 20mA | 9…28 VDC
10,5…28 VDC (TR version) |
SGE-25/Exia/… |
| 3 | 0 ÷ 10V | 13…30 VDC | SGE-25/…. |
| 4 | 0 ÷ 3,3V | 4,1…14,1 VDC | SGE-25/…. |
| 5 | 0 ÷ 5V
0,5 ÷ 4,5 V |
8…14,1 VDC | SGE-25/…. |
| 6 | 4 ÷ 20mA | 10,5…36 VDC | SGE-16/…. |
| 7 | 0 ÷ 3,3 V | 3,6…4,5 VDC | SGE-16/…. |
Error due to supply voltage changes 0,005% / V
Degree of protection IP68 Material of casing 00H17N14M2 (SS316L) Cable shield POLYURETHANE
Material of diaphragm SGE-25 Hastelloy C276 SGE-16 SS316L
II 1G Ex ia IIC T4/T5/T6 Ga
II 1G Ex ia IIB T4/T5/T6 Ga (probes with PTFE cable)
I M1 Ex ia I Ma
Working Principle
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 atmos- pheric pressure through a capillary in the cable.
The active sensing element is a piezoresistant silicon sensor separated from the medium by an isolating diaphragm. The electronic amplifier, which works in com- bination with the sensor, and is meant to standardize the signal, is additionally equipped with an overvoltage protection circuit, which protects the probe from damage caused by induced interference from atmospheric discharges or from associated heavy current engineering appliances.