Teledyne 40, Power Supply Page 9, 2.5 Operation:, FIG 2.4

Page 92.5 Operation:

2.5.1 Displa2.5.1 Displa

2.5.1 Displayy

If the power supply was purchased with the flow instruments, the power supply will be already

set up so that the display reads directly in the units of flow to be monitored. EXAMPLE: A 5 SLPM

unit is connected to channel 1. When the CHANNEL SELECTOR s witch is turned to channel 1,

the display will read 5.00 at 5 SLPM flow rate. A 50 SCCM unit will have the display for its

channel read 50.0 at full flow. Note that the display has 3-1/2 digits, but only two decimal points are

active, therefore a 1 SLPM unit will read 1000 SCCM.

2.5.2 Channel Selection2.5.2 Channel Selection

2.5.2 Channel Selection

The CHANNEL SELECTOR switch in the lower right-hand corner of the front panel (see Fig.

2.4) is used to switch the display between the different flow instruments to be monitored. Note that

the OFF position removes all power from the flow instruments and from most of the power supply.

If the CHANNEL SELECTOR switch is inadvertently turned to the OFF position, the flowmeters

will shut down. After turning the instrument back on, there will be a short period of time before the

flowmeters will correctly indicate the gas flow.

FIG 2.4

2.5.3 Cor2.5.3 Cor

2.5.3 Correction Frection F

rection Frection F

rection Factor Switchactor Switch

actor Switchactor Switch

actor Switch

On the left hand side of the front panel is a switch labeled CORRECTION FACTOR. De-

pressing the right side of this switch will display the gas conversion factor for the channel correctly

selected by the channel selector switch. Normally this will read 1.000. This gas conversion factor is

a multiplier that is factored into the flow signal before it is sent to the front panel display. This

factor will be changed to some value other than 1.000, only if the flowmeter has some gas flowing

through it other than the gas for which the flowmeter is calibrated.

2.5.4 Cor2.5.4 Cor

2.5.4 Correction Frection F

rection Frection F

rection Factor Pactor P

actor Pactor P

actor Potentiometerotentiometer

otentiometerotentiometer

otentiometerss

Refer to Fig. 2.4. To set a correction factor, turn the CHANNEL SELECTOR switch to the

desired channel. Depress and hold the CORRECTION FACTOR switch. The display is now

reading the correction factor currently set for the channel. This factor can be adjusted by turning

the CORRECTION FACTOR POTENTIOMETER for the corresponding channel with a small

screw driver while holding the correction factor switch in the depressed position. Turning clockwise

will increase the factor, and counterclockwise will decrease the factor. Release the CORRECTION

FACTOR switch. The display is now showing the correct flow of the new gas.