Why add liquid?
The liquid filling attenuates vibration, mechanical shock, and pressure pulsation, enabling easier pressure readings.
The liquid filling eliminates corrosion, moisture penetration, and icing caused by the ambient atmosphere.
The liquid filling lubricates all moving parts, thereby greatly reducing the wear of moving parts.
How to choose the right liquid for filling gauges?
The type of liquid used in the filling level gauges of Vacuum pressure gauge manufacturers varies with the application. Although pure glycerin has the best performance in most applications, each has its own requirements. For example, if extreme temperature fluctuations are expected, use silicone oil. The guidelines to help ensure that the fluid is properly matched to the application are:
Glycerin, 99.5% purity = 35°F to 150°F
SILICONE, 200 ist = -100°F to 150°F
Mineral oil = 0°F to 115°F
What if my application experiences severe pressure fluctuations or pulsations?
In applications involving severe pressure fluctuations or pulsations, restrictors and/or buffers are recommended. In addition, under these conditions, a liquid-filled meter will extend the life of the meter.
How do I fill the liquid level gauge?
To fill most Glycerine-filled manometers, simply remove the filling plug located on the top of the pressure gauge (12 o'clock position), and then slowly pour the filling medium. Make sure there is a gap between the fill fluid and the top of the ½" window.
When does a liquid-filled gauge box need to be vented?
always! *After installing the pressure gauge, all pressure gauges filled with liquid should be vented to maintain accuracy. Temperature fluctuations during and during transportation can cause the liquid filling to expand and contract, thereby increasing or decreasing the case pressure. As a result, accuracy may be reduced, and the pointer may not be returned to zero correctly until the meter discharges it into the atmosphere.
How to empty a pressure gauge filled with liquid?
Just cut off the rubber tip from the fuel plug on the top of the pressure gauge (12 o'clock position). *
Does AMETEK / US Gauge sell refueling?
No, but most industrial supply companies can easily obtain filling fluids.
* The 1900-type liquid-filled pressure gauge uses a pressure-equalizing diaphragm and does not require exhaust.