Industrial Scientific Ventis MX4 Product Manual page 31

Zero and Quick Calibration Process
Display and Options
Zero In-process Screen
Each sensor's numerical value becomes zero except
O . An updated O span value displays. The clock icon
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flashes and the zero icon displays.
NOTE: The "span reserve" of a sensor measures its sensitivity. The
displayed span value divided by the calibration gas value equals the
span reserve percentage. A span reserve percentage of greater than
70% indicates a "good" sensor; 50%-70% indicates "marginal"
sensitivity. When the span reserve percentage is less than 50%, the
sensor will not pass calibration.
Zero Results (Pass) Screen
The check mark displays to indicate a successful zero
and a short beep sounds. Each sensor's numerical
values display at zero except O
Options:
Repeat zero
Begin calibration
Enter gas monitoring mode
Zero Results (Fail) Screen
Displays an "F" or "P", respectively, for each failed or
passed sensor. For O , if the sensor passed its
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calibration, the sensor reading displays.
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Ventis™ MX4 Product Manual
Instructions
Allow the zero process to complete and advance to the
Zero Results (Pass or Fail) Screen.
After the zero process, press ON/OFF/MODE to
bypass calibration of the installed toxic and combustible
sensors. The user returns to the mode from which the
calibration process was entered (configuration or gas
monitoring).
NOTE: during the zero process, the O
default gas volume of 20.9%)
Within Ten Seconds
Press ENTER to repeat the zero process.
Press ON/OFF/MODE to advance to one of two screens.
If zero was entered from...
...configuration mode, the user advances to the
Calibration Apply Gas Screen.
... gas monitoring mode and the calibration in-field option
is enabled, the user advances to the Calibration Apply
Gas Screen.
...gas monitoring mode and the calibration in-field option
is disabled, the user advances to the Gas Monitoring
Screen in the gas monitoring mode.
If neither ENTER nor ON/OFF/MODE is pressed, within
ten seconds, the user advances to the Gas Monitoring
Screen in the gas monitoring mode.
Press ON/OFF/MODE (or wait ten seconds) to return to
the Zero Initiate Screen and repeat the zero process.
sensor is calibrated (when set to
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