40
Using the Sensor Zero
The [Z 1] command corrects for any sensor zero offsets. There is no request associated with this function.
This command will zero the currently selected pressure sensor range.
To use the sensor zero:
1. Turn the gas flow off.
2. Drive the valve to full open by issuing the command:
O
Refer to Driving the Valve to Full Open, page 39.
3. Pump the system down to base pressure.
In order to achieve a proper zero, the pressure of the system must be lower than the resolution of the
sensor used to measure system pressure.
4. Enter the command:
Z 1
To remove the sensor zero correction, refer to Removing the Sensor and Special Zeros page 40.
Note
If the pressure reading (at base pressure) is greater than 4% of full range, the sensor will not
be zeroed.
Using the Special Zero
The [Z 2 value] special zero command zeros the base pressure in systems where the known base pressure is
not at, but near zero (as measured by another transducer in the system). There is no request associated with
this function.
To use the special zero:
1. Set your system to base pressure.
2. Send the command:
Z 2 value
where value is expressed as a percentage of full scale pressure (% FS pressure):
value: known base pressure reading transducer’s full scale
To remove the special zero correction, refer to Removing the Sensor and Special Zeros, page 40.
Removing the Sensor and Special Zeros
The [Z 3] command removes the sensor zero [Z 1] and the special zero [Z2 value] correction factors stored in
memory, and is used to determine the uncorrected signal from the pressure transducer. Each time a sensor is
zeroed, the offset changes and the pressure value is updated. In some applications it may be important to keep
the zero offset within a specific range. There is no request associated with this function.
To remove the zero corrections, send the command:
Z 3
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