- The SPES-108 proximity sensor is designed to measure the relative distance of an underwater metallic target surface. It is usually used to measure blade tip clearance in Kaplan turbines as well as runner band clearance in Francis turbines. The sensor can sustain high levels of underwater pressure and is equipped with built-in conditioning circuitry allowing it to be directly connected to processing instrumentation.
- Operation
+ Measurement Type : Non-contact proximity, eddy current
+ Measuring Range : 0 to 8 mm [0 to 315 mils]
+ Outputs : 7.2 to 20 mA; 2 to 10 V
+ Sensitivity : 1.60 mA/mm [40.6 μA/mil]; 1.00 V/mm [25.4 mV/mil]
+ Accuracy : According to correction factor
+ Repeatability : ± 5%
+ Bandwidth : DC to 500 Hz (-3dB)
+ Load at Current Output : 500 Ω max.
+ Load at Voltage : Output 10 kΩ min.
+ Temperature Drift : < 10%
+ Short Circuit Protection : Built-in
- Power Requirements
+ Voltage : 15 to 30 Vdc
+ Consumption : 30 mA max.
+ Voltage Reversal Protection : Built-in
+ Warm-up Time : 5 minutes
- Connection
+ Submersible Integral Cable
Type : 4-wire x 0.22mm2 [24 AWG]
Outer Jacket : PUR / ø 7.5 mm [0.295 in]
Length : 20 m [66 ft]
Min. Bending Radius : 40 mm [1.57 in]
+ Maximum Cable Length
For Current Output : 300 m [984 ft]
For Voltage Output : 100 m [328 ft]
- Environment
+ Temperature Range
Operating : 0 to 45 °C [32 to 113 °F]
Storage : -25 to 70 °C [-13 to 158 °F]
+ Max. Submersible Pressure : 10 Bar [150 psi]
+ Protection Rating : IP69
- Physical Characteristics
+ Sealed Sensor Body : Ertalyte® PET-P