We are trying to establish baseline gasResistance readings on four sensors we are going to use for testing. We reset these, they are all next to each other, and the gas resistance readings are not making sense. Readings sent every one minute and these are after waiting one hour:
Sensor 1
76963
76543
75579
75444
75107
75040
Sensor 2
1148
1148
1148
1146
1146
1145
Sensor 3
1564
1566
1574
1575
1577
1581
Sensor 4
117817
117900
117406
117079
117570
117570
Noticed in Alpha Station, after both resetting and another time powering off, then on, and after at least 45 minutes, Alpha Station still reports “not ready” for GR. See attached.
what are the readings after 30 min ?
were the sensor powered cycled ?
Readings just after 30 minutes were similar/same as above. Didn’t change much over first hour after the warm up 30 min. We did both…first just reset, then did again with power cycle. Same result.
I am assuming that after 30 minutes, the data ready flag was set to high, indicating that the data was ready, even though the readings were not accurate. After power cycling, were the devices placed in a clean environment?
Yes, after power cycling, the devices were placed in a clean environment.
I ran a new test with these five sensors today. Powered them on in a clean environment yesterday and let them acclimate overnight. Then exposed VOC at specific times with the probes all together in one place.
Note: The pressure, temperature and humidity readings were all similar across the five sensors. Only the VOC is inconsistent across sensors.
Please comment and explain why the disparate readings.
Are some of the VOC sensors failing/bad? How do we know if they are working properly? What is the warranty on these?
The reserve byte is Byte 8.
What is the value for ‘heater ready’ vs ‘heater not ready’ in Byte 8?
I’ve tested swapping Sensor 1 probe with Sensor 2, and put sensor 2 probe on sensor 1. The values followed the probes.
