DH Instruments PPC2 AF - Page 68

PPC2 AF OPERATION AND MAINTENANCE MANUAL
© 1998 DH Instruments, Inc. Page 62
HEAD(=)
Purpose: Read or set the head settings.
Syntax: “HEAD=h,u,g”
“HEAD”
“HEAD=0,cm,N2”
Arguments:
h The height of the test in relation to the PPC2 AF. This will be positive if the
test is above the PPC2 AF, or negative if below the PPC2 AF. This value can
be between -9999 and 9999. Setting this value to ‘0’ will disable the head
correction.
u The height units. This must be “in” or “cm”.
g The gas type. This must be “N2”, “Air” or “He”.
Remarks: The PPC2 AF can make a head correction to allow it to display the pressure at the test instead
of the pressure at the PPC2 AF.
Example: Command: “HEAD=10,cm,N2”
Reply: “10, cm, N2”
Errors: ERR# 6: The arguments are not within given limits.
See Also: 3.2.7
HS(%)(=)
Purpose: Read or set the control hold limit.
Syntax: “HS”
“HS%”
“HS=n”
“HS%=p”
Arguments:
n: The hold limit in the current pressure units.
p: The hold limit in %FS of the current active range.
Remarks: The hold limit can be read and set as a pressure or as a percent of the range. If this command
is used to set the hold limit, the PPC2 AF will then use CUSTOM control settings.
Example: Command: “HS=5”
Reply: “5.000 kPa”
Errors: ERR# 6 The provided argument was invalid.
See Also: 3.1.2.3, 3.1.2.4, 3.2.3, 3.2.6
IF=
Purpose: Increase the pressure quickly.
Syntax:
“IF=n”
Arguments:
n ‘0’ Closes the fast up valve.
‘1’ Opens the fast up valve.
Remarks: Opening the fast up valve will cause the pressure to increase quickly. Care must be used, as the
pressure will not stop increasing until the valve is closed, or the upper limit is passed.
Example: Command: “IF=1”
Reply: “IF=1”
Errors:
ERR# 6: The n argument is a ‘0’ or a ‘1’
See Also: “UL” command, 1.2.7