Why can some pressure gauges only be used up to an ambient temperature of 140F (60C)?
If the window of the pressure gauge is made from safety glass, then it can only be used up to an ambient temperature of 140°F (60°C). The safety glass is made from two glass discs. These glass discs are stuck together using a foil. If the temperature rises above 140°F (60°C), then the foil blisters. Consequently, the scale will no longer be able to be read reliably.
Why does one have filled pressure gauges?
The filling fluid serves as damping for the moving parts within the case. As a result, damage caused by vibration and increased wear on the moving parts can be prevented.
Which instruments are suitable for liquids with small measuring ranges?
Diaphragm pressure gauges up to 0.23 psi (16 mbar) are suitable for liquids (through self-emptying of the pressure chamber).
What is the difference between a standard pressure gauge and a safety pattern version?
A safety version has an additional solid baffle wall welded between the dial and the measuring system. In addition, the case has a back wall that can blow out completely. The window is typically made of laminated safety glass. If a pressure builds up in the housing (e.g. from a rupture in the Bourdon tube), this pressure will exhaust completely through the back wall, which is then ejected from the case by the pressure. A release of pressure through the window cannot occur, so there is no risk to personnel through splinters of flying glass.
What is the Accuracy class?
The Accuracy class gives the error limits in percent of the measuring span.
What happens when a model 16 differential pressure gauge with separation diaphragms made of elastomers is operated below the ambient temperature specified in the data sheet?
Below the permissible ambient temperatures, the accuracy deteriorates significantly, since the diaphragm (which is either made of FPM / FKM or NBR) stiffens at low temperatures.
What can I do if the medium temperature with filled-gauges is over 212°F (100°C)?
You can use a pressure gauge syphon, a diaphragm seal or a capillary line as an additional cooling element in order to lower the medium temperature.
How low is the temperature of the medium which is stored inside the cryogenic vessel when it reaches the pressure gauge?
A Cryo gas is a gas which is gaseous at ambient temperature and pressure and becomes liquid because of cooling and compression. Due to cooling and compression the volume of the gas can be reduced and thus it’s possible to store a huge quantity inside a vessel. Want more details,please contact with us!
How does the measuring system for Model 16 differential pressure gauges with diaphragms behave outside the full scale value?
The plus or minus-sided over pressure safety, up to the maximum working pressure is achieved through the metallic measuring element support surface arrangement. Pressures within the permissible overload range leave no lasting damage on the measuring system.
Does the height above sea level have any effect on the measuring result of relative pressure measuring instruments?
No, this has no effect, since it is always the pressure differential from ambient that is measured.
