AFRISO RF EX Serie Betriebsanleitung Seite 74

9 Additional equipment
9.1 Shut-off unit
EJECTED PARTS AND ESCAPING MEDIUM
Residual medium may escape when the pressure gauge is dismounted.
• Verify that you have taken all necessary protective measures before dis-
mounting.
• Use the personal protective equipment required for the medium.
Failure to follow these instructions can result in death, serious injury or
equipment damage.
A shut-off unit between the pressure tap point and the product allows you to
check the zero point of the product or to dismount the pressure gauge without
interrupting the process. Depending on the application, you can use valves
or cocks.
Cocks have three settings:
• Vent
- The supply line is closed and the measuring element is connected to
atmospheric pressure. The zero point can be checked.
• Operation
- The supply line is open and process pressure is applied to the measur-
ing element.
• Blow out
- The supply line is open, the medium is discharged into the atmosphere.
The measuring element is out of operation.
Valves (for example, as per DIN 16270/16271) usually feature a vent screw
between the valve seat and the product.
In certain applications (for example, steam boilers), the shut-off units must
have a test connection so that the pressure gauge can be checked without
having to be dismounted.
Additional equipment
WARNING
RF ... EX / KP ... EX
EN
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