Placement and Calibration of Sensors
Calibrating Toxic Gas Sensors
EVM Series User Manual
Toxic Gas Span Calibration
When conducting a span calibration, the calibrated gas used should match the sensor you will be
calibrating.
NOTE: For Ozone span calibration, an ozone generator should be used.) If you are continuing from
the Toxic Zero cal section, the screen you will be viewing is the Calibrate/Pause screen. (If
you are performing a Span cal only, ensure you are at the Start screen and select the
calibrate menu. Then select the specific sensor by pressing up/down arrows. Press the Cal
soft key and then press the Span soft key. Proceed to Step 2.
Performing a span cal for Toxic gas
1. Continuing from the zero cal procedures, you should be viewing the Cal/Pause screen (as
displayed in Figure 4-17). Press the Span soft key.
2. Apply the gas at full flow rate while observing the “Level” field on the display. Wait for the current
level to stabilize (allow a couple of minutes).
Level
Allow to stabilize
Set
Figure 4-21: Span Calibration
3. Adjust the span value by pressing ▲/▼ Arrows on the keypad.
4. Press the Set soft key to store the span cal. point. (A screen will appear displaying that you set the
span cal. point.)
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