Q. How does a differential pressure (dp) gauge measure level in a cryogenic tank?
A. A differential pressure (dp) gauge has two ports, a high pressure port and a low pressure port. On a cryogenic tank the high pressure port of the gauge is piped to the bottom of the tank. Since the tank is pressurized the low pressure port of the gauge is piped to the top of the tank, the vapor space. The difference between the high and the low pressures then represent the height of the liquid only. On Orange level gauges, differential pressure is relayed to the gauge through a magnetically coupled sensor-indicator design.
Q. How do you calculate the range required for a dp level gauge on a cryogenic tank?
A. Cryogenic tanks have an inner and an outer tank. Multiply the height of the inner tank by the specific gravity of the liquid. Then multiply by .90 to account for the top 10% of the tank occupied by the ullage or vapor space. This 10% is typical, not a standard factor. The calculation becomes, Height (inches) x SG x .90 = XX inches H2O. For more detail on this or for assistance in calculating the level range for your tank contact Orange.
Q. What size tanks can Orange Research gauges and transmitters be used on?
A. Orange has level gauges or transmitters for all size tanks, including liquid cylinders, micro-bulk tanks, bulk tanks, ISO tanks and trailers. For more details on matching your tank to an Orange solution please contact us.
Q. What gases can Orange level gauges be applied to?
A. LIN, LOX, LAR, CO2, LNG. For information about matching your gas to an Orange level gauge please contact us.
Q. How do I specify an Orange level instrument?
A. Each product page has a How To Order section which steps you through the features required to complete a configuration of your gauge. You can contact Orange directly for assistance.
Q. What units are available for your scales?
A. Most common scales are in InchesH2O, but psid, bar, kPa, gallons, liters, % and many others are standard.
Q. Do you have level transmitters for Telemetry?
A. Yes, Orange has dp level transmitters that are commonly integrated into Telemetry systems. They are a standard option for adding to a gauge, or as a transmitter only, with no gauge. The outputs are 4-20mA (2-wire) or 0-5Volts. The outputs of our wired transmitters are fed to the telemetry systems. To discuss integrating our level transmitters into your telemetry system contact us directly.
Q. Can Orange level gauges handle the cold temperatures of cryogenic liquids?
A. The liquid in a cryogenic tank is boiled off to a gas by the time it reaches our gauges, so the temperatures are quite warm relative to the liquid phase during storage. So, there is no problem with the cold temperatures actually coming into contact with our level instruments.