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14
EARLY
,
TIGHTEN THE NUT
.
I
F IT DID NOT TRIP
,
LOOSEN THE
NET
.
13)
S
ECURE THE LOCKNUT AND GO BACK TO STEP
9
AND
CONTINUE
.
S
UBSECTION
3.3.3
B
ACKPRESSURE REGULATOR
T
HE BACKPRESSURE REGULATING VALVE IS DESIGNED TO PREVENT FREE
FLOW OF THE PROCESS FLUID THROUGH THE PUMP
.
N
ORMALLY IT IS SET
TO THE
MOP
OF THE PROCESS
.
T
HE PUMP AND TUBING SHOULD BE
PROPERLY PURGED
(S
ECTION
3.4,
S
TEP
4)
PRIOR TO PERFORMING THIS
STEP
.
NOTE:
T
HIS VALVE SHOULD COME PRESET FROM FACTORY AND SHOULD
NOT REQUIRE ADJUSTMENT UNDER NORMAL CONDITIONS
.
T
HIS SECTION
ALSO ASSUMES PRIOR KNOWLEDGE OF SAMPLER OPERATION
.
1)
S
WITCH TIMER TO
0
POSITION
2)
D
IVERT THE SAMPLE TO A TEST CONTAINER USING THE TEST SAMPLE
OUTLET LINE
.
3)
LOOSEN LOCKNUT ON BACKPRESSURE VALVE
.
4)
SWITCH TIMER TO
TEST
MODE AND MONITOR GAUGE
.
5)
A
DJUST BACKPRESSURE VALVE IN TO RAISE PRESSURE AND OUT TO
LOWER
.
THE VALVE SHOULD MAINTAIN THE DESIRED SET POINT IN
BETWEEN PUMP CYCLES
.
D
URING A PUMP STROKE
,
IT SHOULD READ
SLIGHTLY HIGHER
.
6)
R
ETURN TIMER TO
0
POSITION
7)
TIGHTEN LOCKNUT AND TAG SWITCH
.
8)
D
IVERT SAMPLE BACK TO CONTAINER AND RETURN TIMER TO
OPERATING SET POINT
.
