YZ Systems Milton Roy • 201 Ivyland Road • Ivyland, Pennsylvania • USA • 18974 • P: 281.362.6500 • www.yzsystems.com
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NJEX EUR ver.08-2021
Section 1: First Things To Know About The NJEX
Theory of Operation
Operation of the NJEX centers around three primary
components: the pump, the Verometer and the Model
N-300G controller.
During normal operation, the pump injects an ex-
act quantity of odorant at a rate determined 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 Verometer serves as a temperature
compensated meter which verifies the amount of
odorant injected by the 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 predetermined low level point,
the N-300G controller actuates a solenoid valve which
opens the fill valve, allowing the Verometer to be re-
filled. Once the Verometer is filled, the N-300G control-
ler closes the fill valve.
The N-300G controller allows the NJEX 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 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 injec-
tion rate (mg/m3), pump displacement (cc/stroke), and
the odorant density (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-select-
ed percentage of the flow input.
The flow input signal is read by the N-300G controller
eight times per pump stroke. These readings are aver-
aged and the time duration until the next stroke is then
calculated by the controller. The maximum time be-
tween strokes is 99.99 minutes (when gas is flowing),
regardless of the time calculated by the controller.
CAUTION:
Excessive tubing lengths should be avoided. Instal-
lation 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 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 1.281.362.6500.
System Accessories
• Odorant Injection Probe, includes a 316 stainless
steel probe, and isolation valve for location at the
pipeline. When ordering, please specify pipeline
connection required, 1/2" to 3/4".
• Odorant Injection Probe with Sightglass, includes
a 316 stainless steel probe, visual odorant sight
indicator, and an isolation valve for location at the
pipeline. When ordering, please specify pipeline
connection required, 1/2" to 3/4".
• 1/4" stainless steel discharge tubing In-line Check
Valve. For placement in the odorant discharged
tubing line immediately preceding the probe assem-
bly, (P/N A3-0024).
• 1/4" 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-
0182).
• 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 C4-0018, 15 gallon scrub-
ber.
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.
Summary of Contents for NJEX 6300G
Page 1: ...NJEX 6300G 7300G N A T U R A L G A S O D O R I Z A T I O N S Y S T E M...
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Page 3: ...NJEX 6300G 7300G Instruction Operating Manual Version 08 2021...
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