Specifications

molbox™ RFM™ OPERATION AND MAINTENANCE MANUAL

 OPERATION

To select a DISPLAY function, press [DISPLAY] from the MAIN run screen.

The display is:

1avg 2rate 3hi/lo

4total 5unit 6dev ↓

7freeze 8clean

The cursor is on the active DISPLAY function. Selecting a DISPLAY function returns to the

MAIN run screen with the selected function active.

See Section 3.4.6, PRINCIPLE for a summary of DISPLAY functions and Sections 3.4.6.1

through 3.4.6.8 for detailed information on each DISPLAY function.

In molbloc-S operation, at times, the back pressure ratio, BPR, will be too high for molbox

RFM to calculate a meaningful flow value. When this occurs, the top line of the run screen

display always reads <BPR HI> and the bottom line shows the label <BPR> and the

current measured BPR value. This display has priority over the appearance of the display

functions described in this section, but the display will return to normal when the BPR

returns to a usable level for molbloc-S measurements (see Section 3.1.2).

The default DISPLAY function is RATE which causes the second line of the display to

show <R> followed by the current rate of change of flow in current flow unit of measure

per second (see Section 3.4.6.1).

3.4.6.1 <1RATE>

 PURPOSE

To activate the RATE DISPLAY.

See Section 3.4.6, PRINCIPLE.

 OPERATION

To activate the RATE DISPLAY press [DISPLAY] and select <1rate>. Selecting <1rate>

returns to the MAIN run screen with the RATE DISPLAY active.

With the RATE DISPLAY active, the MAIN run screen is:

1. Standard MAIN run screen top line.

2. Current rate of change of flow in current flow

unit of measure per second.

* 101.27 sccm N20

R 0.03/sec

The RATE DISPLAY is different and separate from the stability setting that

is used to set the stability criterion on which the Ready/Not Ready

indication is based (see Sections

3.1.3). The RATE DISPLAY only causes the

current

rate

of change to be displayed and has NO affect on the stability

setting or the Ready/Not Ready condition.