DST ObservAir Manual de instrucciones - Página 9

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LED Flash Pattern

1x Blue

1x Green

1x Red

1x Blue

2x Blue

2x Purple

Table 5. Index of menu items displayed when holding down the LED

button. The LED display will cycle through the options in the order listed

until the button is released at the desired selection.

3.2.4. Attenuation reset

Optical attenuation (ATN) represents the filter's BC loading. By definition, a

clean filter tab (devoid of any BC) has an ATN of exactly 0. However, since

the optical depth of each filter intrinsically varies, the light intensity

transmitted through the active and reference filters on the tab are not

always equal, and the apparent ATN through the clean filter is therefore not

equal to zero, as desired.

The ObservAir automatically detects when the filter tab has been

changed, measures the apparent ATN, and offsets the ATN data by this

value such that ATN = 0 when the filter is clean. If the sensor does not

automatically detect the filter change for any reason, the ATN can be

manually reset by holding the LED button until the first green flash and

releasing. The LED will flash green twice more to confirm the selection, and

the ATN will be set to zero for the current light intensity values.

3.2.5. Sensor shutdown

To turn off the ObservAir, hold the LED button to cycle through the menu

until the first red flash and release. The sensor will flash red two more times

to confirm that it is shutting down.

3.2.6. Sensor alarms and errors

When a measurement error occurs or an alarm is triggered, the LED button

continuously flashes red or yellow. The speed and color of the flashing LED

denotes different error codes. If the ObservAir displays an error, refer to

Section 5 for troubleshooting instructions to diagnose and resolve the issue.

ObservAir Operating Manual

Sensor Function

Menu enter feedback

Reset attenuation

Power off

Reserved for future features

Provision WiFi settings

Firmware update mode

3.3. Filter tab replacement

To change the filter tab, first release the thumbscrew by turning it

counterclockwise for about four full turns (Figure 8). Remove the filter tab

by pulling is straight out from the front of the sensor. The filter tab should

release from the sensor with little resistance. If there is any resistance,

further loosen and/or push down lightly on the thumbscrew to release the

filter tab. Second, insert a new filter tab with the notch aligned to the solid

white circle on the faceplate, as shown in Figure 9. Third, insert the new

filter as far as possible, such that the tip of the notch is flush to the front

panel, and hand tighten the thumbscrew firmly.

Figure 8. Step 1 of filter tab replacement: Loosen thumbscrew and

remove the filter tab

Filter

Notch

Figure 9. Step 2 of filter tab replacement: Insert a clean filter into the

sensor. Align filter notch with the solid white circle on the front panel.

Align filters/notch on tab with

solid white mark

ObservAir

Operating Manual