Oldham WX16, User Manual

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WX16 User Manual | 16
configured to transmit sensor life values after each calibration (see Figure 2.6). For
Sensor Life to record properly, the monitor must perform as follows: After the
Calibration Marker interval, 4.0mA transmits for 10 seconds to indicate its calibration
mode is complete. The monitor then transmits between 4.0mA and 5.0mA for five
seconds depending on remaining sensor life where 4.0mA = 0% and 5.0mA = 100%
remaining sensor life. The WX16 reads this value and records it as the channel’s
Sensor Life . Sensor Life is stored in the WX16 ModBus database and displayed as a
bar-graph in the Sensor Info screen (see section 2.3.6). It is a useful tool for planning
sensor replacement schedules.
Figure 2.6
2.2.5 Linearization Menu
The linearization menu allows each channel to have its own linearization curve stored
in the controller’s non-volatile memory. Input versus output points must be entered in
percent of full scale values. This means if the range is 0-200 ppmH2S, then 100 ppm is
50% of full scale. Zero input will provide a zero output and 100% input a 100% output.
Nine intermediate points may be entered to define the curve.