YZ Systems NJEX 8300G, Manual, Page: 10 / 126

YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Page 3 NJEX 8300 ver.092001 ATEX Rev.
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ECTION ECTION ECTION ECTION ECTION
1: F 1: F
1: F 1: F
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IRST IRST IRST IRST IRST
T T
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HINGS HINGS HINGS HINGS HINGS
T T
T T
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O O O O O
K K
K K
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NOW NOW NOW NOW NOW
A A
A A
A
BOUT BOUT BOUT BOUT BOUT
T T
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HE HE HE HE HE
8300 8300
8300 8300
8300
Theory of Operation
Operation of the 8300 centers around three primary
components: the Model 8000 pump, the Model
VM-2100 Verometer and the Model N-300G controller.
During normal operation, the Model 8000 pump
injects an exact quantity of odorant at a rate deter-
mined by the N-300G controller. The quantity of
odorant injected per stroke is set using a spacer in
the pump actuation assembly. The rate at which the
pump is actuated is determined by the N-300G controller.
The VM-2100 Verometer serves as a temperature
compensated meter which verifies the amount of odorant
injected by the Model 8000 pump. The N-300G
controller uses an input signal from the Verometer to
determine the amount of odorant that has been
injected, as well as the odorant level within the
Verometer. Once the odorant level falls to a predeter-
mined low level point, the N-300G controller actuates a
solenoid valve which opens the fill valve, allowing the
Verometer to be refilled. Once the Verometer is filled,
the N-300G controller closes the fill valve.
The N-300G controller allows the 8300 system to
operate in either a time-based mode or a proportional-
to-flow mode. In the time-based mode of operation, the
N-300G controller actuates the Model 8000 pump at
a regular time interval preset by the operator.
In the proportional-to-flow mode of operation, the
N-300G controller uses a customer provided gas flow
rate input signal and several operator input values to
calculate the time between strokes of the pump. These
operator input values include the odorant injection rate
(lbs/MMCF or mg/m3) , pump displacement (cc/stroke) ,
and the odorant density (lbs/gal or g/cc) . The flow input
signal is customer provided by either a flow computer or
other flow monitoring devices. In this mode, the controller
has the capability to distinguish between a low flow
situation and a loss of flow input signal. For systems
with analog inputs, if a loss of flow signal occurs, the
controller automatically defaults back to a pre-selected
percentage of the flow input.
The flow input signal is read by the N-300G control-
ler eight times per pump stroke. These readings are
averaged and the time duration until the next stroke
is then calculated by the controller. The maximum
time between strokes is 99.99 minutes (when gas is
flowing), regardless of the time calculated by the
controller.
Caution:
Excessive tubing lengths should be avoided. Installation
of the NJEX Odorization system should be as close to
the point of injection and Odorant Storage Tank as
possible. Maximum tubing length should not exceed
15' (4.5 meters) with the tubing size maintained as
indicated in this manual. If longer tubing lengths are
required consult YZ Systems Technical Services at;
800.653.9435 or 1.936.788.5593.
System Accessories
• Odorant Injection Probe , includes a 316
stainless steel probe, and isolation valve for location
atthe pipeline. When ordering, please specify pipeline
connection required, 1/2" or 3/4".
• Odorant Injection Probe with Sightglass, includes a
316 stainless steel probe, visual odorant sight indica-
tor, and an isolation valve for location at the pipeline.
When ordering, please specify pipeline connection
required, 1/2" or 3/4".
• 3/8" stainless steel discharge tubing In-line Check
Valve . For placement in the odorant discharged
tubingline immediately preceding the probe assembly,
(P/N A3-0025) .
• 3/8" stainless steel tubing Dielectric Isolator Union .
These should be installed in every tubing line that
attaches the odorizer to the pipeline in any manner.
For example the supply gas, odorant discharge, and
differential pressure switch connections,
(P/N A1-0183) .
• NJEX Scrubbers . These filters are designed to scrub
the exhaust gas vented from the pumps or Overflow
Protector of the Expansion Tank. They are available
by ordering
P/N C4-0024, 15 gallon scrubber .
A complete line of odorization accessories ranging from
pre-odorized gas scrubbers to injection probes is
available through YZ. Please contact your local
representative or YZ toll free at 800.344.5399. For
technical support call 800.653.9435.