Functional description
The intended use of the Pressure control panel CRS2000-2L is the expansion of a gas from a gas source and the distribution of the gas with adjustable outlet pressure.
You select which side of the pressure control panel is to be used by operating the lever / handwheel of the right pressure regulator:
- Lever on top right / lower stop of handwheel with logo aligned horizontally: right pressure regulator in operation
- Lever down left / starting from the lower stop of the handwheel, turn 360° anticlockwise; logo horizontal again: pressure regulator on the left is in operation
The left pressure regulator is fixed. If the outlet pressure of the right pressure regulator is below the setting of the left pressure regulator, the left side is in operation. If the right pressure regulator is above the setting of the left pressure regulator, the right side is in operation.
The automatic and interruption-free switchover to the reserve side on the left, where the pressure is set lower, takes place as soon as the outlet pressure on the operational side (on the right) drops to below that of the reserve side. This can happen as a result of the constant emptying of the gas cylinders on the right and thus the falling of the inlet pressure on the operational side to under the level of the reserve side or as a result of very large amounts of gas being drawn, thus lowering the outlet pressure on the operational side quickly. Thus, if the reserve side goes into operation, the outlet pressure made available by the switching panel is lower than the outlet pressure made available beforehand by the operational side.
Before replacing the empty gas source of the right side with a full one, the lever / handwheel must be operated so that the outlet pressure of the right reserve side is below the left operational side, which can thus remain in operation.
It is different with automatic switchover from the left to the right side.
If the right reserve side goes into operation, the outlet pressure made available by the switching panel is lower than the outlet pressure made available beforehand by the left operational side. Manual operation of the lever / handwheel helps here: It increases the outlet pressure of what has been the reserve side and converts it to the new operational side with higher outlet pressure.
In the case of two-stage switching panels, the fall in the outlet pressure as a result of the switchover is barely noticeable. The outlet pressure is kept largely constant by means of the second regulating stage. All single-stage automatic switching panels have an inlet pressure gauge for each pressure regulator to indicate the current inlet pressure.