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7500 S
M
P
erieS
anual
Leakage Compensation Hysteresis "HYST"
In operation mode, there may be excess leakage of pressure from the enclosure due
to a faulty seal or gasket. There could also be enclosure pressure loss due to a drop
in regulated line pressure. 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 P* and will de-energize when above
P*+HYST.
Note
P* = P2 for Programs 1,2,3, and 5.
P* = P3 for Program 4.
Note
If leakage compensation is not required, set HYST to '0'.
Values for Hysteresis (HYST)
Inches W. C.
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 = 1.5, 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.
56
rograMMing
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