6. Operations and Adjustments
22
PNEG-2174
Sampler - Model GRA
Power OFF/ON Switch S-2
This toggle switch controls all electrical power to the controller and the sampler unit.
Sampling Mode Switch S-3 (Automatic/Manual)
This switch permits the operator to select whether samples will be collected automatically at precisely
timed or counted intervals as determined by the Digital Display Timer (T-1) or Counter C-1 or manually
whenever the operator momentarily actuates the MANUAL SAMPLING toggle switch (S-4).
Manual Sampling Switch S-4
This switch functions ONLY when the AUTO/MANUAL switch has been set to the Manual Mode position.
Switch S-4 is a spring-return switch that is maintained in the OFF or Normally Open position. Correct
operating procedure is to momentarily actuate S-4 to the Start position. When the SAMPLING light is
illuminated, release the switch. The sampler will complete its cycle without further operator intervention.
Power Pilot Light
This light is illuminated as long as power is available to the controller and the POWER switch (S-2) is set
to ON.
Sampling Pilot Light
This light will illuminate when the sample pelican is traversing thru the product flow.
Digital Display Timer T-1 (Standard)
As arranged for use in this system, the timer operates in the DOWN and STOP mode. When the AUTO
mode is selected, the illuminated display resets to the value dialed in to the Three Digit Preset.
Immediately, the timer begins timing down. When the illuminated display reads all zeroes (000), the timer
has “timed out” and initiates a sampling cycle. The sample pelican traverses thru the product flow to collect
a sample. The timer display resets to the preset value and another timing interval is initiated. If the
controller is shut off or the mode switched from AUTO to MANUAL, the timing cycle is terminated. When
power is restored or the AUTO mode is again selected, the display is reset to the preset value and another
cycle begins.
NOTE:
A new timing cycle can be initiated ONLY after the sampling cycle has completed.
1.
External Settings
a.
The Display:
The high intensity blue fluorescent display consists of three digits and decimal point (if decimal is
set in tenths or hundredths position). Also, there is a blinking Timing Bar and a special Time-Out
symbol. The Timing Bar appears to the right of the digits and blinks once every second during
timing. The Timing Bar shows quickly that the timer is actively timing especially when the digits
do not change rapidly as in the “hours” ranges. When the delay relay is energized at time-out, a
triangular Time-Out symbol appears to the left of the digits. The Timing Bar blinks noticeably
faster at time-out.
This machine starts without warning. Moving parts can cause severe injury. Clear
area prior to controller start-up.
