44
7500 Series Manual
Leakage Compensation Hysteresis “HYST”
In operation mode, there may be excess leakage of pressure from the enclosure because a seal or gasket
has caused a drop in regulated line pressure (protective gas source). The leakage compensation option
allows the SV to turn on to compensate for these unintentional leakages. Depending on the purge program
being used, the SV will energize when below P2 and will de-energize when it is above P2 + hysteresis.
Note!
If leakage compensation is not required, set HYST to ‘0.’
Values for hysteresis HYST
Inches of wc mbar
0 0
0.2 0.5
0.4 1.0
0.6 1.5
0.8 2.0
1.0 2.5
1.2 3.0
1.4 3.5
1.6 4.0
1.8 4.5
2.0 5.0
Example
Units are in mbar, hysteresis = 15, then SV is on at P2 and turns off at P2 + 1.5
The HYST unit of measurement is the units being used.
If HYST = 1.5, then this is 1.5 mbar.
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