Caron Measurement & Controls | www.caroncontrols.net
CHAPTER 3…………………………………TOP CUT OPERATION
THE TOP CUT SAMPLER ELECTRONICS OPERATE ON ONE 6 VOLT PC915
ALKALINE BATTERY. OPERATING LIFE OF THE BATTERY VARIES WITH SAMPLING
FREQUENCY, BUT WILL GENERALLY LAST 6 TO 18 MONTHS.
THE SAMPLER OPERATES ON A TIME BASED INTERVAL. THE BUILT IN TIMER IS
TRIGGERED WHEN THE LOOP IS CLOSED ACROSS FLOW SIGNAL INPUT
TERMINALS (FLOW SIGNAL OPTIONS LISTED IN SECTION 2.2). THE TIMER IS
RETENTIVE IN-BETWEEN CYCLES OF THE FLOW SIGNAL INPUT. THIS MEANS
THAT IF THE SIGNAL INPUT IS OPENED BEFORE THE TIMER RUNS OUT, THE TIMER
WILL PAUSE, AND RESUME FROM THE REMAINING TIME THE NEXT TIME THE
INPUT IS CLOSED.
WHEN THE FLOW CONDITION INPUT IS CLOSED, THE TIMER BEGINS TO COUNT.
WHEN THE TIME SETTING IS REACHED, THE PULSE VALVE WILL SWITCH ON FOR
2 SECONDS, THEN OFF AGAIN FOR 2 SECONDS, AT WHICH POINT THE TIMER WILL
RESET AND START COUNTING UNTIL THE INPUT GOES OPEN. IN THE ON
POSITION, THE PULSE VALVE STROKES THE SAMPLE PUMP AND PUSHES THE
SAMPLE FLUID THROUGH THE BACKPRESSURE VALVE AND INTO THE SAMPLE
CONTAINER. WHEN OFF, THE PUMP RETURNS TO ITS RESTING POSITION,
DRAWING ANOTHER SAMPLE FROM THE PROCESS.
THE INTERVAL TIME SETTING IS SELECTABLE FROM THE 8 POSITION SWITCH
INSIDE THE SAMPLER TIMER BOX. SETTING 0 IS RESERVED FOR THE OFF
POSITION, WHILE 1 THROUGH 7 ARE PROGRAMMABLE SET POINTS. THE SET
POINTS ARE SET UP CUSTOM FOR EACH UNIQUE INSTALLATION AND ARE
MARKED IN SHIPPING HOURS PER DAY. THE TIMER CHIPS ARE FIELD
REPLACEABLE TO ACCOMMODATE CHANGES IN PROCESS CONDITIONS. FOR
MORE INFORMATION PLEASE CONTACT OUR SUPPORT TEAM.
TIME SETTING SHOULD BE SET TO FILL THE SAMPLE CONTAINER WITH 7.2L OF
FLUID AT THE END OF THE CHOSEN SAMPLE PERIOD. A SAFETY SHUTOFF VALVE
IS USED TO DISABLE THE SAMPLE PUMP WHEN THE SAMPLE CYLINDER REACHES
7.2L. BECAUSE THE SAFETY SHUTOFF USES WEIGHT OF THE SAMPLE CONTAINER
TO GAUGE ITS CONTENTS, IT NEEDS TO BE CALIBRATED TO ACTUAL SAMPLE
DENSITY (SEE SECTION 3.3.1).
