Specifications

MFC-CB™ Operation and Maintenance Manual

3.2.3 [POWER]

 PURPOSE

To display of the set value unaltered by K or adjustment values and to display the valve

test point.

 PRINCIPLE

The electrical value actually output by MFC-CB in response to a set point entry may be

different from the set point value due to the application of a K factor (see Section 3.2.1)

and/or a

n adjustment factor (see Section 3.3.5). See Section 7.1.1 for details on the

cal

culation of the actual set point. The [POWER] screen displays the actual electrical

value output by MFC-CB in response to a set point input.

Some mass flow controllers allow access to a valve test point voltage measurement to

assist in troubleshooting the MFC’s operation. MFC-CB can measure and display the

valve test point voltage. A display of this value is available by pressing the [POWER]

function key.

The valve test point is always in Volts (V), even for an MFC whose set point and flow

measurement are in current (mA.).

For MFC-CB to display the valve test point, the MFC being used must support valve test

point measurement and be properly connected to the MFC-CB. Refer to the MFC

manufacturer’s documentation for information on the valve test point and to Section 7.2

for in

formation on MFC-CB DEV1 and DEV2 connections and pin outs.

 OPERATION

To display the set point and MFC valve test point press [POWER] from the run screen.

The display is:

1. Actual set point for active device channel.

2. Active device channel indicator.

3. Current valve test point reading.

Press [ESCAPE] or [ENTER] to return to the MAIN run screen.

The POWER run screen displays the actual MFC set point which may be different from the

entered set point due to the application of a K factor and/or adjustment factors (see

Section 7.2).

The POWER screen is a run screen from which other functions can be accessed.

For example, while in the POWER screen, press [SET MFC] to change the MFC set point,

[DEV1/2] to change device channels or [MFC] to select a new MFC profile.

Set point: 2.0000

Valve: 3.475 V D1