South-Tek Systems N2Blast FPS-15000 User manual

FPS-15000
FPS-20000
Fire Protection Systems
O&M Manual
Version 3
© 2020
The Leader in Nitrogen Generation Technology

O&M Manual v2
Page 3
Email: [e-mail]
TABLE OF CONTENTS
1. INTRODUCTION ..........................................................................................................................................5
1.1 ABOUT SOUTH-TEK SYSTEMS................................................................................................................................6
1.2EQUIPMENT SAFETY AND HANDLING INFORMATION ..................................................................................................7
1.3 ROOM VENTILATION RECOMMENDATION................................................................................................................8
1.4 LIMITS OF LIABILITY .............................................................................................................................................8
1.5 WARRANTY .......................................................................................................................................................9
1.6 SERVICE RETURN POLICY ......................................................................................................................................9
2. RECEIVING, UNPACKING, AND STORAGE INSTRUCTIONS.......................................................................... 10
2.1 RECEIVING EQUIPMENT......................................................................................................................................10
2.2 UNPACKING,MOVING,AND SECURING EQUIPMENT................................................................................................10
2.3 STORAGE INSTRUCTIONS ....................................................................................................................................10
3. SITE AND UTILITY REQUIREMENTS ........................................................................................................... 10
3.1 AIR SUPPLY......................................................................................................................................................10
3.2 ADDITIONAL PIPING AND HOSES ..........................................................................................................................11
3.3 ELECTRICAL SUPPLY...........................................................................................................................................11
3.4 SITE SPECIFICATIONS .........................................................................................................................................11
3.5 OUTDOOR PACKAGE UNITS (ONLY ON CERTAIN MODELS)**......................................................................................12
4. SYSTEM INSTALLATION............................................................................................................................. 13
5. SYSTEM DESCRIPTION .............................................................................................................................. 14
5.1 SPECIFICATIONS................................................................................................................................................14
5.2 STANDARD CONTROLS AND INSTRUMENTATION OVERVIEW.......................................................................................14
5.2.1 Power Switch/Power Light Indicators ..................................................................................................14
5.2.2 Hour Meter / Running Data .................................................................................................................15
5.2.3 Pressure Transducer Setup...................................................................................................................15
5.2.4 Sieve Bed Pressure Gauge ....................................................................................................................17
5.2.5 Tank Pressure Indicator .......................................................................................................................17
5.2.6 Inlet Air Pressure Regulator Gauge......................................................................................................17
5.3 FILTERS...........................................................................................................................................................18
5.4 PLC ...............................................................................................................................................................19
5.4.1 Alarm Settings......................................................................................................................................19
5.4.2 Calibration Procedures.........................................................................................................................20
6. PRINCIPLES OF OPERATION ...................................................................................................................... 22
7. GENERATOR OPERATION.......................................................................................................................... 23
7.1 START-UP.......................................................................................................................................................23
7.1.1 Initial Start-Up .....................................................................................................................................23
7.1.2 Normal Start-Up...................................................................................................................................24
7.2 SHUTDOWN.....................................................................................................................................................24
7.2.1 Emergency Shutdown ..........................................................................................................................24
7.2.2 Normal Shutdown ................................................................................................................................24
8. BLASTOFF™ - LEAK DETECTION SYSTEM (OPTIONAL)................................................................................25
9. MAINTENANCE......................................................................................................................................... 26
9.1 POWER ISSUES .................................................................................................................................................26

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9.2 INCOMING AIR FILTRATION.................................................................................................................................26
9.3 REBUILD PROCESS VALVE ....................................................................................................................................28
9.4NITROGEN GENERATOR .....................................................................................................................................28
10. TROUBLESHOOTING .................................................................................................................................29
APPENDIX A: CUSTOMER EQUIPMENT LAYOUT/CONNECTION DRAWING ...........................................................31
APPENDIX B: SPECIFICATIONS.............................................................................................................................. 33
APPENDIX C: WARRANTY.....................................................................................................................................34
APPENDIX D: APS INSTALLATION ......................................................................................................................... 35
35
APPENDIX E: QUICK-CHECK FIXED MOUNT CONNECTIONS ..................................................................................36

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1. Introduction
South-Tek Systems welcomes you to the exciting world of Nitrogen Generation! We provide leading edge
technology in Pressure Swing Adsorption (PSA) type Nitrogen Generators that allow you to produce
Nitrogen at your own facility. Our technology allows you to reduce your N2 gas costs by as much as 90%
versus purchasing from a gas supplier. We develop PSA systems worldwide that are utilized in industrial, lab,
and military settings. We pride ourselves with our abilities to communicate and engineer Nitrogen Generation
systems to meet specific requirements of our customers!
Here at South-Tek Systems, we engineer simple, turnkey generators to provide cost-effective means of
producing your own nitrogen gas. Our technology is based on years of R&D on how to most effectively
utilize Carbon Molecular Sieve (CMS) to filter the nitrogen from the other gases in the air. We use the
highest quality CMS provided to the market which goes through extensive in house quality testing procedures.
Our design principles require clean dry compressed air being delivered into two pressure vessels packed with
CMS. We’ve engineered our systems to provide our customers with years of confidence and reliability in the
nitrogen generator with the proper maintenance and care.
Each Nitrogen Generator comes individually tuned, pre-tested and certified to meet the customer’s specified
nitrogen flow rate and purity using our Data Acquisition System (DAS). Our certification provides the
necessary criteria to replicate a successful field installation. Our systems are turn-key with detailed drawing,
manual, and phone/text support. We also have field service, commissioning, and other engineering services
available.
The N2-BLAST®provides an economical, precise means of generating high purity nitrogen. Since air is
comprised of ~79% N2we simply and cost-effectively separate the N2from the air. Nitrogen is an inert gas
(non-combustible) and widely used in thousands of industries along with Fire Protection Systems. The N2is
“generated” by means of our PSA technology.
* * * Read before installing and operating the N2-BLAST®* * *
All personnel (and their supervisors) installing, operating, and maintaining the N2-BLAST must read and fully
understand this manual prior to installing, operating or performing maintenance on the system.
The N2-BLAST produces Nitrogen (N2) at a low flow rate, which quickly dissipates into the air. N2gas is not
poisonous but the gas should not be directly inhaled, since in high concentrations, they can cause
asphyxiation. Ensure that the unit is installed within a well-ventilated room, one that is not sealed off from
normal living space air changes.
All personnel involved with installation, operations, and maintenance of the N2-BLAST must follow safe
working practices, OHSA, and local health/safety code regulations during the installation, operation, and
maintenance of the unit.
Electrical Requirements: Connect the N2-BLAST to an electrical supply following all local safety regulations.
Ensure the unit is supplied with 110V/60hz power rated at 20 amp service. The unit must be grounded.
Servicing the N2-BLAST. Before personnel attempt to service the unit, ensure the power switch has been
turned to the off position, then disconnect the unit’s external power cord from the building electrical power
supply. Always follow specific manuals from STS when servicing your system.

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1.1 About South-Tek Systems
South-Tek Systems, founded in 1997, is a Nitrogen Generator manufacturer, designing and producing
Nitrogen generating systems for worldwide distribution.
Why not generate Nitrogen at your own facility for a fraction of the cost versus endlessly paying for bulk
liquid or delivered gas cylinders? We manufacture a full line of Nitrogen generating equipment including:
The N2 GEN® Series with generators ranging from the compact 1 LPM table top lab generator on up
to the 50,000 SCFH unit
The BeerBlast™ Mixed Gas Dispense System for restaurants and bars seeking the perfect draft pour
The TireBlast™ Nitrogen Tire Filling System for automotive and tire shops seeking optimal tire
pressure maintenance and fuel economy
With purities ranging from 95% up to 99.999%, we provide Nitrogen Generators that are sure to suit your
needs. Plus we design and manufacture our patented Leak Detection system to work with compatible
generators for optimum safe operation.
For more information about our complete Nitrogen Generator capabilities, please visit
www.southteksystems.com.

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1.2 Equipment Safety and Handling Information
The following section outlines the basic safety considerations regarding use of your Nitrogen Generator. For
additional safety information regarding other equipment used in conjunction with the nitrogen generator,
such as air compressors, dryers, boosters, etc., please refer to individual manufacturer recommendations and
technical guidelines.
Read carefully and act accordingly before installing, operating or repairing the unit.
The operator must employ safe working practices and rules when operating the nitrogen generator.
The owner is responsible for maintaining the unit in a safe operating condition.
Always use approved parts when performing maintenance and repairs. Make sure that replacement
parts meet or exceed the pressure requirements.
Only authorized, trained and competent individuals must perform installation, operation,
maintenance and repair.
Completely depressurize the generator, tanks, and lines prior to performing any mechanical work,
including changing the filters. The nitrogen must be vented to the outside or to a large, well-
ventilated room to avoid suffocation due to lack of oxygen.
Safety glasses should be worn if the cabinet door is open while the machine is operating.
WARNING
Pressurized gases are contained within the generator, the receiver, and product tanks. High-pressure
gases are dangerous and may cause injury or death if handled or used inappropriately.
Never allow high-pressure gas to exhaust from an unsecured hose. An unsecured hose may exhibit a
whipping action, which can cause serious injury. If a hose should burst during use, immediately
close all isolation valves.
Never disable or bypass any safety relief valves on the air receiver or product tanks.
Always make certain that the nitrogen generator is unplugged prior to performing any electrical
work.
NOTE
If any statement or specification within this booklet, especially with regard to safety, does not agree
with legislation or standard industry practices, the more demanding shall apply.

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All personnel involved with installation, operations, and maintenance of the PSA Nitrogen Generator must
follow safe working practices, OSHA, and local health/safety code regulations during the installation,
operation, and maintenance of the unit.
Warning:
This manual must be read in its entirety prior to installing and operating the generator to
prevent accidents and damage to the generator
Contact your supplier if you detect a problem that you cannot solve with this manual.
Only use the generator in accordance with its designed purpose.
Only service-engineers, that are qualified to work on electric and pneumatic equipment, are
allowed to do the installation, maintenance and repairs. Unqualified people are not allowed to
repair the equipment.
Do not tamper or experiment with the equipment or exceed the technical specifications
1.3 Room Ventilation Recommendation
The nitrogen generator will exhaust a slightly higher oxygen (O2) to nitrogen (N2) concentration than
normally found in air. Typically concentration will be between 20.9 to 40% O2 balance with N2. The
volume of gas exhausted to the room is approximately equal to bed’s pressurized volume at 50% of the
incoming air pressure to the generator every minute. For example, let’s assume the bed volume at
atmosphere is 10 cubic feet, and the incoming air pressure is equal to 100 PSIG, then the calculations are
as follows:
100 PSIG x 50% = 50 PSIG, then convert PSIG to PSIA,
50 PSIG +14.7 PSIG = 64.7 PSIA, then convert to ATM,
64.7 PSIA / 14.7 (PSIA/ATM) = 4.4 ATM, then calculate total volume stored,
4.4 ATM x 10 cubic feet/ATM = 44 cubic feet, then consider this once every minute,
44 cubic feet / 1 minutes = 44 standard cubic feet per minute vented from the unit.
1.4 Limits of Liability
Buyer's exclusive remedy for all claims shall be for damages, and seller's total liability for any and all losses
and damages arising out of any cause whatsoever including, without limitation, defects in or defective
performance of the system, (whether such claim be based in contract, negligence, strictly liability, other tort or
otherwise) shall in no event exceed the purchase price of the system in respect of which such cause arises or,
at seller's option, the repair or replacement of such; and in no event shall seller be liable for incidental,
consequential or punitive damages resulting from any such cause.
Seller shall not be liable for, and Buyer assumes all liability for, the suitability and the results of using
Nitrogen by itself or in any manufacturing or other industrial process or procedure, all personal injury and
property damages connected with the possession, operation, maintenance, other use or resale of the System.
Transportation charges for the return of the System shall not be paid unless authorized in advance by Seller.
NOTE

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Any MODIFICATIONS made by the customer without the consent of South-Tek
Systems will void the product purity and output specifications.
1.5 Warranty
The Nitrogen Generator, excluding the air supply system, is warranted against defects in materials and
workmanship, under normal use and operation, as applicable in the warranty listed below. All compressors,
booster, dryers, and/or other 3rd party equipment are covered by their original equipment manufacturer's
warranty.
The South-Tek Systems’ Warranty includes the following:
Free repair or replacement of component parts where defects occur within the first twelve (12) months of
operation or twelve (12) months from the date of invoice, whichever comes first.
These warranties shall be null, void, inoperative, and not binding upon South-Tek Systems if a defect or
malfunction occurs in the product or any part thereof from any feed air malfunction, or improper filter
element maintenance, or repair, attempted repair, adjustment or servicing by anyone other than an authorized
representative of South-Tek Systems, or external causes. Said warranty shall extend and apply to the
Nitrogen Generator only while said system is owned and used exclusively by the original purchaser.
NOTE
THERE ARE NO EXPRESS WARRANTIES BY South-Tek Systems, OTHER THAN THOSE
SPECIFIED HERE. NO WARRANTY OF TITLE AS PROVIDED IN THE UNIFORM,
COMMERCIAL CODE SHALL BE IMPLIED OR OTHERWISE CREATED UNDER THE
UNIFORM COMMERCIAL CODE, INCLUDING BUT NOT LIMITED TO WARRANTY OF
MERCHANTABILITY AND WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.
1.6 Service Return Policy
If it is necessary to return a system for service, follow the procedure given below. This procedure must be
followed when returning a system for service.
If the system cannot be repaired at the site, then the owner must obtain a written Return Material
Authorization number, which references the model and serial number, from South-Tek Systems.
No items will be accepted for service or credit unless prior written authorization has been issued by
South-Tek Systems.
All items are to be returned with the original packaging material if possible. Make sure that all items
are packaged for safe return to South-Tek Systems. South-Tek Systems will not be responsible for
damages, which occur in transit. Any damage that occurs to the system because of failure to adhere
to this procedure will be the sole responsibility of the customer. Contact South-Tek Systems for a
return shipping address.
Shipping charges must be prepaid on all returns.

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2. Receiving, Unpacking, and Storage Instructions
2.1 Receiving Equipment
The Nitrogen Generator(s) and all components are securely packed to minimize possibilities of damages
during shipment. The contents of the crate(s) should be inspected upon delivery to assure that no damage has
taken place during transit. Save the carton and wrapping, as it may be necessary to return the generator in
event of shipping damage. If any components are found to be damaged, the carrier should be notified
immediately. The individual pieces should be checked against the packing list. If any discrepancy is found,
contact your local distributor or South-Tek Systems at [phone]. Please include the model number and
the serial number with all correspondence.
2.2 Unpacking, Moving, and Securing Equipment
The FPS-15000 and FPS-20000 are placed upright and securely bolted down inside of a wooden crate.
Removal of these style generators is easily accomplished by opening the wooden crate and unbolting the unit
from the crate. To lift the Nitrogen Generator out of the box, insert forks through the open slots on the bottom
of the generator.
Once the equipment is moved to its final destination, it is recommended to anchor the equipment to the
ground. Please follow any guidelines associated to your site in safely securing all equipment.
2.3 Storage Instructions
If the unit is not to be installed until a later date, a safe dry storage location is needed, preferably inside a
controlled environment. Desiccant packets need to be put into the cabinet to keep moisture out of the
electronics. Do not store around moving objects that could fall or damage the unit. If the unit is kept in
storage for a long extended time (over 1 month), then the Oxygen Fuel Cell/Analyzer should be removed,
tapped off, and stored in a controlled environment.
3. SITE AND UTILITY REQUIREMENTS
The following requirements must be met to enable the nitrogen generator to perform at its rated capacity.
Deviation from these requirements may result in poor performance, injury to persons or machinery, and
voiding of warranty.
3.1 Air Supply
Air supplied to the generator must be between 100 F / 38 C and 33F / 0.5 C, with a water dew point of
40F / 5C or below. Air at temperatures higher or lower than this may cause damage not covered by
warranty. Likewise, moisture content higher than that specified may damage the adsorbent material and void
the warranty. Air and nitrogen pressure vessels must be compatible with the generator. Use of a correctly
sized refrigerant dryer will ensure that the air supplied to the generator will meet the specified standards.

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The performance of our PSA type Nitrogen Generators is based on minimum 100 psig / 6.9 bar g operating at
standard conditions. Operation at higher or lower pressure will result in a nitrogen production above or below
design. Operation at higher pressures than 150 PSIG may damage the media inside the pressure beds. Also, f
air supply is capable of greater than 150 PSIG be sure that the delivered flow rate is less than the safety relief
capacity. Consult South-Tek Systems for your safety relief capacity if your air pressure is greater than 150
PSIG. Air consumption for each Nitrogen Generator depends on nitrogen product purity and flow rate. Please
consult South-Tek Systems for details.
3.2 Additional Piping and Hoses
The air supply piping components must be capable of supplying the required amount of feed air at the
required pressure measured at the generator inlet connection. If the length of piping from the air receiver is
greater than 50 feet, an air supply line one size larger than the Nitrogen Generator inlet air nozzle size should
be used.
3.3 Electrical Supply
Power supply must be 110 V - 240 V / 50 - 60 Hz / 1 PH / 7A as labeled on the unit. Power consumption is
less than 100W. Each unit is supplied with a 110 VAC USA power cord; however, obey local code to finalize
your power connection to your site supply. If you are located outside the US and need to select a power cord
you will need a properly rated plug for your region with a ground.
3.4 Site Specifications
Select a non-hazardous area indoors for installation which remains above 33 F / 0.5C and below 100 F / 38
C. Adequate space should be provided around the generator for access and routine maintenance. Ensure that
there is enough space for the air receiver and product receiver skid next to the unit.
The exhaust piping from the nitrogen generator may be vented outside, but any additional piping used should
be the same size as the exhaust piping supplied with the generator or larger depending on the length of the
pipe. Exhaust piping should not have any restrictions or valves, and should be as short as possible.

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3.5 Outdoor Package Units (only on certain models)**
Our Outdoor Package allows for our Nitrogen Generators to be installed outdoors with limited protection from
the elements. It is highly recommended that a roof and or walls help shield from driving rains when possible.
The Typical Outdoor Package upgrades:
See your project quote and specifications for specifics
The N2 Generator’s electronics cabinet to a NEMA4 cabinet.
When equipped with a oxygen analyzer, the cabinet has a N2 Purge coming back from the N2
storage tank which allows it to maintain a very low dew point which keeps the cabinet dry within.
Always keep the cabinet closed tightly to protect the internal components. This helps the electronics
to stay within their operational range of -5°C to 40°C with a Relative Humidity of 10%-90% non-
condensing.
A Valve cabinet with NEMA4 style doors and limited openings protect the pneumatic valves which
control the air and N2 through the N2 Generator.
The specified valves can handle temperatures from -5°C to 50°C ambient temps with dry air passing
through them.

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4. SYSTEM INSTALLATION
This section provides a step-by-step procedure for easy installation of the Nitrogen Generator with optional air
supply system and tanks.
1. Follow the instructions for unloading/unpacking the Nitrogen Generator described in Section 2.2.
2. Position the nitrogen generator in an area as described in Section 3.4. Lift the nitrogen generator
carefully to avoid damaging piping or control system.
3. Review the supplied customer “Equipment Connections Drawing” (See Appendix A: Customer
Equipment Layout/Connection Drawing) for detailed layout instruction design for your specific
equipment. This may include a combination of an air compressor, dryer, air cooler, air receiver tank,
nitrogen generator, nitrogen storage tank, and nitrogen booster.
4. Carefully lift the equipment(s) and position them in a manner that is most suitable to the customer site
conditions. Use lifting and strapping devices that are rated to move the equipment. It is recommended
that the nitrogen storage tank should be located as close to the nitrogen generator as possible.
NOTE:
Carefully attach lifting devices and any rigging to limit heavy impacts and jolting motions which
may damage the piping and valves within the system.
5. Install the air compressor and refrigerant dryer (if supplied) in accordance with the manufacturer’s
instructions. Attach air supply connections to the Nitrogen Generator. Install suitable piping or hoses
from the compressor to the dryer, from the dryer to the air receiver, and from the air receiver to the
Nitrogen Generator. The connections may be "hard plumbed" by the user, if desired.
NOTE:
Use of piping sizes smaller than the recommended size will significantly decrease system
performance.
WARNING
Use only materials with compatible pressure rating on components on the product pipe lines.
6. Install relief valve on the air receiver and nitrogen receiver if not provided by South-Tek Systems.
7. Check all fittings for leaks using a leak detecting solution.
8. A qualified electrician should install all electrical connections and the electrical power supply. Plug the
nitrogen generator into an approved outlet of the correct voltage and frequency. Connect the optional
compressor(s) and dryer to an appropriate power supply (according to the requirements stated on the
motor nameplate).

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5. SYSTEM DESCRIPTION
5.1 Specifications
The table below is a general specification for standard nitrogen generators. Refer to specification project documents
for specific details of the unit.
Table 1: Specification Table
General Specifications (see Unit Detail Drawing for Specific Design Data)
Nitrogen Purity
95-99.999% (purity is set at factory)
Installation
Floor standing, Skid Mount
Display
3.5” Full Touchscreen
N₂Operating Pressure
60-100 PSIG (contact STS for options outside this range)
Cabinet Port Connections
NPT Female
Electrical
110-240V / 50-60Hz / 1Phase; < 2 Op Amps
Ambient Temperature
40° to 104°F (4° to 40°C)
Noise Level (dbA)
< 90 dbA
Sieve Bed Design Pressure
150 PSIG
Storage Tank Design Pressure
140 PSIG
5.2 Standard Controls and Instrumentation Overview
Each of our three types of generators, (Tank Mount, Cabinet, and Skid Mounts) all comes standard with
certain controls and instrumentations. This section describes the function of the major controls and
instrumentations associated with our standard nitrogen generators. Do not attempt to alter any controls or
instrumentations; any changes without the consent from South-Tek Systems will void the performance
specifications unique to your system.
Controls for supporting equipment, such as the compressor and dryer, are not included in this section.
Please consult the original manufacturer’s instructions for further information.
5.2.1 Power Switch/Power Light Indicators
The power switch is built into the Unitronics Touchscreen located in the upper left corner. It is the main
switch that controls powering on the nitrogen generator. The “Green Indicator” is lit when the unit is “ON”,
and the “Red Indicator” indicates “OFF”.
Touching the indicator for 2 seconds will manually change the states from ON/OFF position. A manual stop
will stop the PSA cycling. Nitrogen production will stop; airflow flow from optional air receiver does not
need to be stopped as the Nitrogen Generator will internally stop the delivery of airflow.
The PSA System Status can be viewed in the lower left corner. The “Green Run” indicates system operation,
the “Red Stop” indicates a manual stop, and the “Amber Standby” indicates the system in standby mode. The
“Standby Mode” is automatically programmed to enter the standby state once Nitrogen Storage Pressure is

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achieved. In standby, the unit will pause the PSA cycling until it is ready to re-enter the operating state. See
below for an illustration of the power switch and system status indication.
Start / Stop
Button
Nitrogen Tank
pressure
N2PSA System
Status
Show O2&
N2Graphs
Button
Goto Auxilliary
Menus Button
O2
Concentration
"Green"
indicates valve
is OPEN
"Black"
indicates valve
is CLOSED Escape back
to Main screen
Key
Figure 1: Power Switch/System Status
5.2.2 Hour Meter / Running Data
From the “Main Screen”, the user can access the “Run Hour” and graphic displays of the O2% content and
N2 Storage tank pressure. To do so, touch the icon labelled “Graph” (see Figure 1). The bottom left
shows the total run hours. The graph shows the current running O2 %. To see the N2 Tank pressure, click
on the green PSI button to switch the graph (See Figure 2).
Exit back to
main screen
button
Press here to
Display PSI graph
PSA Generator
Runtime Hours
Press here to
Display O2graph
Oxygen % Graph N2Tank Pressure Graph
Figure 2: Graph Menu
Data is collected continuously at a sampling rate of 1 sample every 5 seconds. Once the screen reaches 5000
data points, data is scrolled off the screen 1 data point at a time, as new data is plotted in a FIFO arrangement.
5.2.3 Pressure Transducer Setup

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The PLC is equipped with a pressure transducer to display the current pressure of the Nitrogen in the Storage
Tank. It’s tied into the PLC with a 4-20 mA signal and programmed to allow manual input of cut in / cut out
pressures.
** The cut in / cut out settings are factory set and should not be adjusted without contacting South-
Tek Systems. Adjusting these settings may alter the results of the N2 purity as well as the N2 flow
capabilities.
To see what the factory setpoints are, the user can hit the “Menu” button from the main screen, then “Pressure
Transducer Setup” (Figure 3). A password prompt screen will appear. Touch the blue box and a numerical
keypad will pop up. Enter in the password provided by South-Tek Systems and hit enter. (See Figure 4)
Exit back to
main screen
button
Goto
Calibrations
Menu
Goto Pressure
Setup Menu
Goto Timing
Menu Goto Alarms
Menu
Goto
Maintenance
Menu
Figure 3: Menu Screen
Function Key Assignments Ret. to
Main Menu
Password Screen
Press here to bring
up the password
entry keypad.
Press here to
return to the
main menu
Function Key Assignments Ret. to
Main Menu
Keypad Screen
Enter password
by pressing
keys on keypad
Press here to
return to the
main menu
Press return
key after
entering
password
Keys pressed
will show up
here
Figure 4: Password and Numeric Keypad
With the correct password, the pressure transducer screen will pop up, Figure 5.
Return to
Main Screen
Button
Press here to
change Cut-in
pressure
"Green"
indicates valve
is OPEN
Press here to
change Cut-out
pressure
Press here to
change
debounce time
Figure 5: Pressure Transducer Screen

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5.2.4 Sieve Bed Pressure Gauge
Each unit is equipped with two sieve bed towers. At the top of each tower, there’s a pressure gauge to
monitor the pressure changes in the beds throughout the cycle. These are used to help indicate if there’s any
problem with the air going to each bed.
5.2.5 Tank Pressure Indicator
The PLC comes standard with a pressure indicator to display the current pressure inside the Nitrogen Storage
Tank. Looking at the above Figure 1, the tank pressure can be view on the left side on the main screen.
5.2.6 Inlet Air Pressure Regulator Gauge
All tank and cabinet model units will come standard with the air pressure regulators inside the units. Most
skid model systems will come standard with the air pressure regulators inside the cabinet as well. Some of the
larger units will have the regulator install outside the cabinet. The regulator, Figure 6, will have a 2” back
mount 0-160 psi gauge.
Figure 6: Filters/Air Regulator Set
The regulator will come factory set between 100-150 psi based on the customer predetermined design criteria.
It is set with 150 psi on the front side (pressure coming into the regulator). Based on customer site conditions,
it may be necessary to adjust the regulator to set the pressure to the correct setting. To do so, use the provided
2” pressure gauge on the regulator to set the incoming air pressure based on the site conditions. Depending on
the type of regulator you have, you’ll either loosen a turn knob or a nut slightly to allow you to adjust the
pressure. To increase the pressure, rotate the knob clockwise; to decrease the pressure, rotate the knob
counter clockwise.
**Note –pressure should be set as close to the top of each bed swings as possible. To do this, slowly
adjust the pressure and monitor the air in gauge pressure until the bed swings. Right before the bed
swings, note the air in pressure and use that as your incoming air pressure setting. At the instance of
the swing, the pressure will overshoot up to 15%. This pressure should be ignored and not used as your
incoming air pressure setting. Also note that the output pressure of the compressor limits the
maximum pressure available to the nitrogen generator.

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5.3 Filters
All units come equipped with a standard filter set that includes a Particulate, Coalescing, and Absorbing filter
(Figure 6). Clean filter elements are vital for good system performance. The filters remove particulates as
well as liquid, water, and oil. The pre-filter (Particulate) removes particles down to 5 microns in size. It
should be changed every 12 months.
The coalescing filter removes particles down to 0.01 microns in size. The life of the coalescing filter is
dependent on how well the pre-filter performs its job; it will last for 12 months when the pre-filter is regularly
maintained.
The activated carbon tower and/or activated carbon filter element removes oil vapor down to about 0.003
ppm. The life of the activated carbon tower and/or activated carbon filter element is dependent on the oil
content in the feed air. An activated carbon tower will typically last for 12 months when the upstream filters
are regularly maintained.
See Figure 7, for illustration of how to remove typical filter bowl and replacing the filter element.
Figure 7: Filter Element Removal
**WARNING**
Do not try to remove filter bowls unless both the Air Supply gauge and the Process Pressure gauge
clearly read zero psig. Turn off the power and supply air. Relieve the system pressure by opening the
wedge valve after the regulator.
1. Disconnect the tubes from the bottom of the bowls (if tied into condensate drain system).
2. To remove the bowls, push the bowl latch down and rotate the bowl while pulling down.
3. Inspect the bowls. If the drain system is working properly, the bowls should be empty.
4. Replace any filter element that looks damaged or excessively dirty.
NOTE
A plugged drain system will cause water and oil to carry over into the adsorber, which will cause
permanent damage to the adsorbent. Such damage is not covered by the Manufacturer's Warranty.
Use of filters other than those specified by South-Tek Systems could result in damages not covered by
the warranty.
5. Wash the bowls in soapy water and rinse thoroughly.
6. Remove activated carbon tower and replace with new activated carbon.

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7. Reconnect the drain tubes. Make sure the bowl latches are securely locked in place. Be careful to avoid
cutting O-rings
8. Slowly open the air inlet valve to pressurize the bowls. Examine for leaks and tighten if needed.
The Unitronics Touchscreen has a built in alarm screen that automatically flashes when a filter change is
required (see Figure 8). The screens cannot be cleared until it has been acknowledge by the operator by
hitting the “OK” button.
B
B
Filter Change Required !!!
C
C
Filter Change Required !!!
Figure 8: Filter Change Required Screen
5.4 PLC
Each of our three types of generators, (Tank Mount, Cabinet, and Skid Mounts) all come standard with a
Unitronics Programmable Logic Controller (PLC). The program is proprietary to South-Tek and is uniquely
programmed to meet the needs of individual customer engineered to ordered generators.
The PLC is used for the control sequence of the valves and controls the Nitrogen Generator’s functionality.
All programs are proprietary and shall be locked from the factory. Any changes require factory assistance and
must be done by STS. Unauthorized changes to the program can void all warranties and might cause damage
to the system or cause it to malfunction.
5.4.1 Alarm Settings
Press “Alarm Params” to move to the alarm parameters menu shown in Figure 9. Setting the oxygen percent
value (or ppm value if NTRON 7100 is being used), sets the oxygen output relay to ON until the O2percent
(or ppm value if NTRON 7100 is being used) falls below the value shown on the screen.
Exit back to
main screen
button
Enter O2%
Maximum
Enable /
Disable Alarm
Output
Enter O2PPM
Maximum
Press here to goto
Filter Change
Schedule Menu
Figure 9: Alarm Setting Screen

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Once the value drops below this number, the output relay (Output relay #5) will turn OFF.
5.4.2 Calibration Procedures
From the home screen, press the menu button, then the sensor calibration button, which will take you to the
first image seen in Figure 10. Hit the next button and then the 2 Point Calibration Menu and then select
which device you would like to calibrate. O2 PPM, Max O2, and PSI sensors are the three devices you can
calibrate. Calibration may be required for several reasons. One reason could be moving the unit from a lower
geographical elevation to a region with a higher geographical elevation (different part of the country, or
world). The oxygen sensor has an expected life time of > 900,000 oxygen % hours and should also be
verified for accuracy at least once per year.
Figure 10: Calibration Screen
To calibrate the O2 PPM to read the Neutronic 7100 Analyzer installed inside the unit, you’ll need to obtain
two readings, preferably with at least a 100 ppm spread. Click into the “O2 PPM 2-Pt Calib Screen” and get a
reading of the PPM level on the 7100 analyzer once it’s stable. Write that value down and immediately look
on the “O2 PPM Sensor Calibration Screen” and write down the “Raw Value” seen in the gray box (Figure
10). Now do the same thing once the PPM level has changed at least 100 PPM and stable. Once those values
are recorded, enter them into the corresponding boxes on the “O2 PPM Sensor Calibration Screen”.

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If your N2 Generator model is <99.5% N2 content, you’ll have to calibrate by selection the “Max O2 % 2-Pt
Calib” option. You’ll need at least one certified known gas in the 1% O2 Range. Apply that known gas to the
O2 analyzer port found on the outside of most units on the right hand side (refer to your specific customer
drawing illustration for the exact location). Regulate the Calibrated gas pressure to a minimum of 5 psi and
no great than 60 psi. Enter the value of that known gas as the “Low Limit Cal Source 2”. Leave the gas
applied to the port until the Raw Value has stabilized. Then enter that value into the “Low Limit Raw Value
2”. Repeat this process again for a higher known certified gas, preferably somewhere around the 8% O2
range. If a second certified gas is not available, the use of compressed air will work. Just apply 20.9%
(atmospheric compressed air) as the “High Limit Cal Source 1” and wait until the Raw Value settles and then
enter that value into the “High Limit Raw Value 1”.
Calibrating the Pressure Transducer (reading the N2 Storage Tank) is very similar to calibrating the O2 PPM.
Find the pressure transducer inside the cabinet (for most units they are located in the upper left corner where
the N2 Out Port is located). You’ll need to pull two values again, one low and one high and enter in the
corresponding Raw Value.
**NOTE: This process should not be done frequently. If you find that calibration is needed frequently,
it’s a good indication that it’s time to change out the sensors.