Industrial Scientific Ventis LS Product Manual page 27

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
2
calibration, the sensor reading displays.
Calibration Apply Gas Screen*
The gas cylinder icon flashes. Each sensor's display
shows the calibration gas concentration to be applied.
(The O display is blank as the sensor was calibrated
2
during zeroing.) The monitor waits up to five minutes to
successfully sense the gas.
Calibration In-progress Screen*
If gas is sensed, the gas values for the LEL and
toxic sensors increase and the O
If gas is NOT sensed, a failed calibration registers
and the Calibration Failed Screen displays.
.
2
value decreases.
2
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.
To Terminate
Press ON/OFF/MODE while the gas cylinder icon flashes
to terminate the quick calibration process (or to skip a
sensor's calibration in standard calibration) and return to
the gas monitoring mode.
To Calibrate
•
Place the calibration cup over the upper portion
of the monitor's case top (front of monitor). To
attach properly, complete or observe the
following.
The cup fully covers the sensor ports.
o
The monitor's display and buttons are NOT
o
covered.
The cup's side arms fit securely in the
o
grooves on the sides of the monitor. .
The cup's nipple points up and away from
o
the monitor.
•
Turn (counterclockwise) the regulator's knob.
Ventis™ LS Product Manual
© Industrial Scientific Corporation
27