OPERATION
9
Here is an example of the use of the UP (faster) key:
Refill
Discharge
ID
(sec)
(sec)
Key Press
---
1
2
3
10.0
9.5
9.0
8.5
5.0
5.5
6.0
6.5
103
104
105
106
With this method, the number of complete pump cycles per minute is fixed, within a range of 1
to 6; 4 CPM is the default value which appears at startup. Each time the up/down arrow keys
are pressed, the pump refill and discharge times are both automatically adjusted to maintain
the selected CPM value. Each adjustment increases or decreases the volume pumped per
cycle, and the per-minute flow rate is the volume per cycle X the CPM value.
For example, with a 4 CPM setting, 60 ml volume per cycle equates to 4 X 60 = 240 ml/min
flow rate. A single press of the Flow up arrow key could change the volume per cycle to 80 ml,
for example, resulting in a new, increased flow rate of 4 X 80 = 320 ml/min. And the MP10
assigns a unique identification value to each setting, the ID value, which can be directly set
during later sampling events.
"MP" displayed in the lower left corner of the display indicates MicroPurge mode. The default
CPM setting of 4 cycles per minute is a good starting point for wells with depths from 25-100 ft.
MicroPurge mode starts at a time setting of 10 seconds refill and 5 seconds discharge, close to
optimal for many wells. This startup settings corresponds to a 4 cycles per minute setting
(CPM4) and an ID setting of 103.
Using the CPM key will change the CPM setting on the controller. The range of CPM settings
is CPM1 through CPM6. CPM changes like this each time you hit the CPM key: 4 5 6 1 2 3
4 5, etc. The UP and DOWN keys change the flow rate directly, by altering the refill and dis-
charge times
within
a CPM setting.
Note: changes in settings that are entered while the controller is cycling are reflected on the
next cycle change (so a long refill time of 15 seconds will time out before a new refill time be-
comes valid).
