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TXP-WTA_Instruction_Manual_(Rev1.3)
8.2.1 Measurement Name
The Measurement Name field may be edited to contain virtually any 16-character ASCII string. It is typically used to
describe the monitored point by user tag # or other familiar terminology.
8.2.2 EUnit
Eunit (engineering unit) may have up to a 10-character ASCII field and is used to clearly identify the target gas and
units of measure such as %, ppm or ppb.
8.2.3 Zero (0%)
Zero (0%) defines the reading to be displayed when the monitored value = 0% of full scale.
8.2.4 SPAN (100%)
Span (100%) defines the reading to be displayed when the signal = 100% of full scale. The highest numeric reading
allowed is 9999 including negative polarity sign and one decimal point. Polarity is only indicated for negative
readings.
8.2.5 Decimal Points
Decimal Points determine the resolution of the LCD readings, and may be set to 0, 1 or 2 decimal points. Example:
ZERO readings for 0, 1 & 2 DPs respectively are 0, 0.0 and 0.00.
8.2.6 CAL Span Val
Cal Span Val sets the upscale gas value that must be applied when performing Span calibrations. This is typically at
least 50% of the full-scale range. Calibration accuracy is dependent on this setting matching the value of target gas
in the span gas cylinder used during routine Span calibrations (see Section 5.3).
8.2.7 Readout Dead Band
Readout Dead band allows forcing low readings to continue to read zero. This is useful when there are very small,
safe, levels of background target gas that cause fluctuating readouts above zero. The highest amount of dead band
allowed is 5% of the full-scale range. Example: If the range is 0 – 10.0 ppm, setting Dead band to 3% would mean
the readout continues to display 0.0 until the value exceeds .3 ppm.
8.2.8 Track Negative
Track Negative, set to NO, causes negative values to read the Zero (0%) value in data displays. The CAL MODE
readout will display negative values regardless of this setting. Negative values below the Fault set point will still
cause the Fault alarm to trip (see Section 5.4.1).
8.2.9 Backup Config
Backup Config allows users to store the Channel Menu parameters into non-volatile memory for restoration later, if
incorrect values are accidentally entered or uploaded.
8.2.10 Restore Config
Restore Config restores the Channel Menu database to the values from the most recent Backup Config. The special
keystroke sequence of 4 consecutive UP keys is required to perform the Restore operations.
8.2.11 Load Defaults
Users are encouraged to modify the Channel parameters described in this section when it helps tailor the TXP-WTA
Sensor Transmitter to their project. However, at some point it may be desirable to return all of these settings to
REV – 1.3
[34-2900-0207-4 ]
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