Operation iTrans Fixed Point Single/Dual Gas Monitor
5-16 iTrans User Manual (P/N: 77023554-1)
NOTE: If the “” key is not pressed, the new span value will not be saved.
NOTE: Span Gas Concentration for combustibles can be set from 0% to
100%LEL. For the sake of resolution, we suggest that Span Gas Concentration
should be set above 20% LEL.
5.6.14. Sensor Span Reserve
The span reserve option is designated
with an “r” in the status bit. The
current span reserve is displayed on
the top line of the LED display.
NOTE: There are a few other options
that appear that do not have any
function associated with them. These
are reserved for future functionality.
Figure 5-28. Sample Span Reserve
Display
5.7. Special Notes on Using Broadband Infrared (BBIR) Sensors
The broadband infrared (BBIR) sensor currently used with the gas
monitor does not fully support or follow all of the functionality or procedures listed
within this manual. Differences between the functionality of the BBIR sensor and
the operation explained in this manual are as follows:
There is no real time clock in the BBIR sensor. When looking at the clock
settings, they will be displayed as time and date of initial test. If you set
these values, they will not increment.
Low alarm, high alarm, and 4-20 mA range are factory pre-set to 10, 20, and
100 respectively.
When calibrating the BBIR sensor, the display will not show the actual
concentration of gas applied, it will display zero. Once the calibration is
complete, the display will switch from zero to the actual concentration of gas
applied.
The Span Gas Concentration is fixed at 50% LEL and cannot be changed.
The typical zero time for the BBIR sensor is 3 minutes.
The typical calibration time for the BBIR sensor is 3 minutes.
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