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Series 40 Liquid Level Probes
The Series 40 Liquid Level Probes are designed for use with liquid oxygen, liquid hydrogen and liquid nitrogen. These hermetically sealed stainless steel assemblies are designed to withstand severe environmental conditions and feature a response time from vapor to liquid of 0.25 seconds.
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Specifications
Enclosure
All wetted areas are 316 SS.
Housing hermetically sealed 300 series SS.
Media Connection
MS-33656-E4 boss seal capable of withstanding 2000 PSI media pressure.
Temperature Range
- MediaTemperature
- Oxygen-183.0°C
- Hydrogen-252.9°C
- Nitrogen-195.8°C
- (Boiling point at 1 atmosphere)
Electronic Housing
-20°C to +80°C
Isolation Resistance
Greater than 100 megohms at 50 VDC between all terminals in parallel and case.
Excitation
24 to 32 VDC; reverse polarity protected. Unit protected up to +/- 100 volts at 10 millisecond pulse.
Ice Point Resistance
Series 44B – 200 +/- 1.0 Ohms
Series 44C – 1000 +/- 1.0 Ohms
Output
- Media stateoutput state
- GaseousLogic 0
- LiquidLogic 1
- Logic 0 is nominal 0.0 VDC, (open circuit voltage +3.0, - 0.0 VDC.)
- Logic 1 is nominal 28.0 VDC (supply voltage +0.0, -3.0, - 0.0 VDC.)
- Voltage measurements referenced to external power return.
Repeatability
within +/- 0.10% F.S.O.
Response Time
Less than 0.25 sec for vapor to liquid.
- SI Part NumberTemperature Range
- 40-1 (LOX)-183.0°C
- 40-2 (H2)-252.9°C
- 40-3 (N2)-195.8°C
Notes
Probes available up to 24” in length.
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