DH Instruments PPC2 AF - Initial Setup; Preparing for Operation; Power Connection; Connecting to a Pressure Supply (Supply Port)

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PPC2 AF OPERATION AND MAINTENANCE MANUAL

Support facilities required include:

• An electrical power source of 85 to 264 VAC, 47 to 440 Hz.

• A continuous regulated source pressure of 1 100 psi (8 MPa) clean, dry, non-corrosive gas

to connect to the pressure supply. Lower gas pressure sources can be used but should

exceed the maximum desired test output pressure by 10 to 20%.

• A vacuum source of less than 1 psia (7 kPa) and at least 3 cfm (90 lm) is needed to control

under 2 psi (14 kPa) gauge.

When supply pressure is applied to the PPC2 AF supply port, there is a constant gas exhaust through

the EXHAUST port of PPC2 AF to which the vacuum source will be connected. Therefore, the vacuum

source should either be continuously "on" or should bypass to atmosphere when the vacuum source is

"off" to avoid building up pressure on the EXHAUST port and/or the vacuum pump. To conserve gas,

vent the test volume and shut off the pressure supply when PPC2 AF is not in use.

2.3 INITIAL SETUP

2.3.1 PREPARING FOR OPERATION

To prepare PPC2 AF for check out and operation:

• Remove the plastic caps from the five (5) PPC2 AF rear panel pressure connections.

• Remove the protective plastic sheet from the front panel display.

• Install the rubber feet caps onto the bottom case feet, if desired.

2.3.2 POWER CONNECTION

• Check that the PPC2 AF power switch is off.

• Connect the supplied power cable to the rear panel power module.

• Connect the other end of the power cable to an electrical supply of 85 to 264 VAC, 47 to 440 Hz.

2.3.3 CONNECTING TO A PRESSURE SUPPLY (SUPPLY PORT)

Using a pressure connecting hose of appropriate pressure rating, connect the pressure supply

to the SUPPLY connection on the rear panel of PPC2 AF. The PPC2 AF SUPPLY connection

is 1/8 in. NPT female.

Never connect a pressure supply greater than 1 200 psi (8 MPa) to PPC2 AF.

2.3.4 CONNECTING A VACUUM PUMP (EXHAUST PORT)

For PPC2 AF to set pressures under atmosphere and/or to reliably set pressure under 2 psi (914 kPa)

gauge other than zero gauge, a vacuum pump must be connected to the exhaust port.

Never connect a pressure supply to or plug the PPC2 AF EXHAUST port.

When changing the pressure applied to the EXHAUST port from vacuum to atmosphere, be

sure to change the control reference setting (see Section 3.3.1).