Veris Technologies MSP EC and pH (1997-2008 CF card drive 1.10M) - Operating Instructions User Manual
Page 39
Veris Technologies
Pub. #OM MSP03-1
39
the final settled smoothed soil pH readings (VPHE000.DAT). A formatting example of each file type
follows:
Raw millivolts (VPHLXXX.DAT):
Long.
Lat.
Electrode 1 (mV)
Electrode 2 (mV)
Elevation
Speed
-88.7579
43.49488
-20
-25
291.2
4.5
Wash sequence millivolts (VPHWXXX.DAT):
Long.
Lat.
Electrode 1 (mV)
Electrode 2 (mV)
Controller state
-88.7579
43.49488
-20
-25
33
Extracted soil pH (VPHEXXX.DAT):
LONGITUDE
LATITUDE
pH
TIME
ALTITUDE
SPEED
Sample
Flag
-88.7579
43.49488
6.75
8.5
291.2
4.5
1
The extracted file also contains 5 columns of file statistics at its end offset from the normal data:
accepted
rejected
settling
range
difference
216
1
0
5
mean time
mean speed
6.8
5.1
pH1 mean
pH2 mean
7.00
7.00
pH1 SD
pH2 SD
0.002
0.000
pH1 start
pH1 end
7.00
7.00
pH2 start
pH2 end
7.00
7.00
The extracted pH file contains the coordinates of the reading’s location, the settled, averaged pH
reading, the ti
me the reading took to settle, the readings’ elevation, the speed the vehicle was moving
at the time the sample was taken, the reading’s sequence number, and the reading’s flag sequence
number if the point was flagged during Data Acquisition. The statistics at the end of the file break
down how many points were considered “good” by the extraction routine and how many were rejected
and the reason for rejection. A point can be rejected for 3 reasons: 1. The readings did not settle in
the maximum time allowed; 2. The readings were outside of a reasonable pH range (less than 3.5 or
greater than 9.5); or 3. There was more than a 0.5 pH difference between the electrodes.
SEE GENERAL INFORMATION SECTION FILE MANAGEMENT FOR ADDITIONAL
INSTRUCTIONS ON DOWNLOADING DATA
Clean-up
—ISE storage, wash
If you are going to interrupt your pH mapping for 30 minutes or longer, clean off the electrodes and
the electrode holder with the wash wand, and install the soaker solution container on the electrode
holder. Replace soaker solution (Veris part #23395) weekly, or more frequently if it is diluted or dirty.