Veris Technologies pH Manager - Operating Instructions - Manual (Page 16)

Pub.# OM17-MSP-pH
3-8
The pH readings on the display show what each electrode is reading at every second. The
sampler will hold the soil against the electrodes and continue to record pH until the readings settle.
The minimum recording time is 7 seconds; the maximum time is determined in the pH settings
menu. The pH values that are recorded are the final values at the end of the logging duration. (last
reading on the display before the “Cycling” status appears). The final pH value is logged along
with the DGPS position where the sample was collected.
If the electrodes take longer than 10 seconds to settle, a warning will appear by the readings that
indicates the number of seconds the reading has required. When the maximum log time is
reached, a T will appear indic
ating that the measurement has ‘timed out’, and the unit initiates a
new sample cycle (refer to pH Controller settings for adjusting the log time).
Figure 28
This time warning is to let the operator know that a measurement cycle is requiring excessive time.
While an occasional cycle may exhibit this warning. 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 and return to Neutral. 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 and verify status of system is ‘Disengaged’ 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. This is to
allow operator that the electrodes are not cleaning properly.
pH Offset and Settings Menu
While the instrument is in pH data acquisition, the pH sampler settings can be adjusted without
exiting the current file. For example, it may be necessary to add extra wash or change sampling
time. A correction can be applied to each electrode’s pH shown on the screen. Occasionally, the
pH readings shown on the screen may differ from those expected in the field. A condition that
could cause this is high pH wash water which is elevating all pH readings. If this is the case, the pH
shown on the screen can be adjusted up or down. To enter the settings screen, make sure
message in the upper right of the screen says DISENGAGED. Press the 3 key. The following
screen will display: