Ashcroft GC30 Ultra-Compact Differential Pressure Sensor - Manual (Page 17)

17
Maximum/Minimum Pressure Capture
The GC30 unit keeps the maximum and minimum pressure level applied to the pressure port
as peak and bottom values respectively, in the internal memory. The peak and bottom values
are displayed while holding the
ᮡ or ᮢ keys respectively. Message pe+ is displayed for one
second and selected Max/Min value is displayed by this operation. Maximum and minimum
values are reset when you reset power to the unit or by the following procedure:
Resetting Maximum value: While holding the ᮡ key, pressure the ᮢ key.
Resetting Minimum value: While holding the ᮢ key, press the ᮡ key.
Key lock
Key operations can be turned off to prevent inadvertent overwriting of setting values. Once
the key lock state is set, the function setting, comparator setting, zero point adjust, and loop
check modes cannot be accessed. The key lock mode cannot be reset by turning the power
OFF and ON. It may be reset only by following the unlocking procedure.
To lock, press the MODE + ᮡ keys in measurement mode. The message displays lo( for
one second, indicating that the unit has entered into the key lock state.
To unlock, press the MODE + ᮡ keys again. The message displays unl for one second
indicating that the unit is unlocked.
13. errOr DISPlAY
An error message and pressure value are alternately displayed when one of the following
errors occurs in the measurement mode (In case of “Out of pressure display range” error, only
error message is displayed). Check the content of error message and take the action below
immediately.
error
display Contents Actions
Out of pressure display range (Upper limit)
fff Pressure above 110% FS of pressure had been
applied, or the indicated value exceeded 1999.
Adjust the applied pressure
Out of pressure display range (Lower limit)
within the rated pressure.
-fff Pressure below –10% FS had been applied, or
the indicated value fell below –1999.
Pressure applied during the zero point Open the unit to atmosphere
e-0 adjustment,was outside the range by and perform zero point
± 10% FS adjusment.
e-1 Comparator 1 overloaded
Drop load current below
e-2 Comparator 2 overloaded
80mA before use.
Turn power on again to
e12 Comparator 1 & 2 overloaded
recover from error status.