Veris Technologies MSP EC and pH (1997-2008 floppy disk drive 1.02E) - Operating Instructions - Manual (Page 39)

Veris Technologies
Pub. #OM MSP03-1
39
See the troubleshooting section if this occurs frequently.
The Veris MSP pH Manager uses two electrodes for optimal data quality. If there is a difference of
0.75 or greater between the final electrode readings, an audible alarm will beep, informing the
operator of the erroneous reading.
To pause the data collection process at any time (but keep the same file), press the 1 key. Once the
sampling process has completed its cycle, it will disengage and the status text message will indicate
disengaged. (press 1 to start cycling again) If the system no longer senses a speed signal from the
GPS, it will also disengage. NOTE: do not depend on the GPS speed signal for disengagement.
Before inspecting or working around any component of the system, press the 1 key before
exiting the vehicle. Sporadic GPS signals may simulate movement and initiate the cycling
process, resulting in possible entanglement and injury.
If TAP or DI are selected as the wash water type, the water baseline process will be repeated every
40 cycles following the next engage press. If the pH during the cycling sequence does not get within
0.5 of the baseline pH, an audible alarm will sound and the pH labels will blink.
TIPS
As you collect pH data, monitor the performance of the system by observing the data you collect as
follows:
-Observe the pH data during the wash cycle to see that the electrodes are cleaning properly. If the
pH values during wash are not matching the expected pH of the wash water, or are not coming close
together, inspect wash system.
-Whenever the final pH readings at a sample location are >.75 apart, an alarm will sound indicating
data for that sample location will likely be eliminated during data extraction. If more than an
occasional, infrequent reading is rejected, inspect the sampler assembly for possible plugging or
other malfunction, and the electrodes for proper cleaning. Re-calibrate electrodes if necessary.
-The speed you travel and your transect width directly affects the sample density: 6 mph (9.6 km/hr)
on 50’ (15 m) transects provides approximately 10 samples/acre (24/ha). 10 mph (16 km/hr) on 60’
(18 m) transects results in approximately 5 samples/acre (12/ha). Collect enough samples so that the
raw pH data maps the underlying spatial structure of the field’s pH—rather than relying on
interpolation methods to fill in the gaps in the map.
(See laminated cab card for additional tips.)
Downloading Data
When you are ready to stop collecting pH data to the file, press 1. Wait for the unit to finish its current
cycle and for the PRESS 1 TO START message in the controller message area before pressing 4 to
exit data acquisition.
The instrument will now extract the final pH points from the raw data collected during data acquisition:
After the extraction process is complete, the instrument will display the extracted file statistics:
A more detailed report is located at the bottom of the extracted file (see the example extracted file for
details). Press any key for the following screen: