MKS 247D - Decimal Point and Zero Adjustment

How To Setup the System Cha
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ter Four: O
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eration
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8. Turn the POWER SWITCH ON to apply power to the 247 unit and the attached MFCs.
Note
Allow the MFCs to warm up for a period of 1 hour prior to any zero
adjustments. Best performance is achieved when the MFCs are powered
continuously.
9. Set the DECIMAL POINT for Channel 1.
Insert a screwdriver blade into the slot of the DECIMAL POINT SELECTOR SWITCH
for Channel 1 and rotate it clockwise (CW) until the desired decimal point is illuminated
on the Digital Meter Display.
The Decimal Point Selector Switches are mounted on the rear panel (refer to Figure 6,
page 43); the channels that they control are screened below the switch. The position of
the decimal point is determined by the full scale range of the MFC in use. For example,
a 100 sccm mass flow controller requires the decimal point to be positioned as “100.0”
(display at full rated flow).
10. Adjust the ZERO CONTROL for each MFC until the Digital Panel Meter displays a
reading of ± 000.
If the zero control lacks the range for this adjustment, center it and use the zero control
on the MFC to bring the reading within the range of the 247 unit’s zero control.