Exhaust Port (Vacuum Pump If Required) - Fluke 6270A Operator's Manual

EXHAUST Port (Vacuum Pump if Required)

The exhaust port can be left open to atmosphere under most conditions. A
vacuum pump is required to control pressure below 20 kPa (3 psi) gauge. Tubing
should have a minimum inside diameter of 6 millimeters (1/4 inch). In confined
areas, pipe the exhaust port outside to prevent an accumulation of nitrogen. It is
acceptable to add tubing to the exhaust port for the primary purpose of reducing
noise. Do not block the exhaust tube.
To prevent damage to the Product:
•
Never connect a pressure supply to or plug the Product
EXHAUST port.
•
To avoid building up pressure on the EXHAUST port or on a
vacuum pump connected to the EXHAUST port, the vacuum
source should either be continuously ON or the EXHAUST
port should be bypassed to atmosphere when the vacuum
source is OFF. This is because when a supply pressure is
applied to the Product SUPPLY port and the Product is not
in the vent ON condition, there is typically a constant gas
exhaust through the Product EXHAUST port.
•
When controlling down in pressure, the Product will exhaust
gas through the EXHAUST port. The flow of this gas can be
greater than what the vacuum pump can support. When
working at higher pressures, Fluke Calibration recommends
that the vacuum pump be turned off and equipped with an
auto-vent valve.
Caution
Pressure Controller/Calibrator
Rear-Panel Manifold Pressure Connections
19