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TXP-WTA_Instruction_Manual_(Rev1.3)
8.5.1 Set Gain to Unity (TECHNICIANS ONLY!)
Set Gain to UNITY allows resetting previous calibration OFFSET to zero and GAIN to one. This is the definition of
UNITY. A calibration should be performed after setting UNITY (see Cal Mode Section 5.3).
8.5.2 PreAMP Gain Adjust (PGA) (TECHNICIANS ONLY!)
Gas sensors have a very wide output signal range, across the many gas types, and there are several full-scale ranges
for each type. Preamp Gain is the adjustment that matches the sensor element's signal range to the Smart Sensor's
input signal conditioning circuits.
The Preamp Gain value is saved into non-volatile memory on the Smart Sensor module. Altering the Preamp Gain
automatically resets previous calibration OFFSET and GAIN values to UNITY as described in see Section 7.5.1.
If it is determined the Preamp Gain value is incorrect:
1. Apply the desired up-scale target gas value to the sensor.
2. Use the UP/DOWN keys to obtain the correct Reading value.
NOTE: Counts are the 12-bit binary A/D value with an active range value of 800 – 4000 for 0-100% of full scale.
Example Scale:
Counts
800
% of Scale
0
REV – 1.3
Figure 8-5 – Technicians Menu Tree
1200
1600
25
50
[34-2900-0207-4 ]
2400
4000
75
100
34 |
P a g e
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