6. Operations and Adjustments
PNEG-2174
Sampler - Model GRA
23
b.
Setting Switches:
The three digits are set with the rotary switch knobs located beneath each digit. These knobs can
be rotated in either direction (CW or CCW) and they are “pull” removable if digit set security is
desired. Changing one or more digits, during timing, will instantly be reflected by an equivalent
change in the timer’s display. Setting all three digits to zero will cause instant time-out of the timer.
2.
Internal Settings
The 365 digital display timer must be removed from its housing to alter any of the following
settings.
a.
Time Range:
Decimal Point Location
can be changed with the white plastic lever mounted behind the front
face of the timer. This lever moves into three positions. With finger force you can change its
position and at the same time observe the front of the timer.
NOTE:
This procedure sets the
decimal point electronically as well as visually.
Time Units (Sec/Min/Hr)
are set by moving a small width metal arm in a slotted arc on the side
plate nearest to the units (Sec/Min/Hr) window. By depressing this arm slightly with a pencil or
pen point, it can be moved to a new position. The time units physically change in the timer’s face
and the timer is electronically switched to the new units as well.
b.
Line Frequency:
To set the proper line frequency, connect the jumper wire to either the 50 Hz or 60 Hz pin. These
pins are clearly marked on the side of the timer.
NOTE:
The timer chassis and the housing are polarized so that the chassis cannot be inserted into its
housing upside-down. If the timer is forced into the housing upside-down damage will result.
Digital Display Counter C-1 (Optional)
As arranged for use in this system, the counter 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 counter begins counting down. When the illuminated display reads all zeroes (000), the
counter has “counted out” and initiates a sampling cycle. The sample pelican traverses thru the product
flow to collect a sample. The counter display resets to the preset value and another counting interval is
initiated. If the controller is shut off or the mode switched from AUTO to MANUAL, the counting 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 counting 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 a Counting Bar with a
special Count-Out symbol. The Counting Bar appears to the right of the digits and blinks once
every count, regardless of range. When the delay relay is energized at count-out, a triangular
Count-Out symbol appears to the left of the digits.
b.
Setting Switches:
The three digits are set with the rotary switch knobs located beneath each digit. These knobs can
be rotated in either direction (CW or CCW) and they are “pull” removable, if digit set security is
desired. Changing one or more digits, during counting, will instantly be reflected by an equivalent
change in the counter’s display. Setting all three digits to zero will cause instant count-out of
the counter.
