Frequently Asked Questions

Get informed with Frequently Asked Questions for a hassle-free experience.

It is recommended that your analyzer be checked for accuracy on an annual basis.  If your calibration is off or is reading incorrectly, then follow the steps below for recalibration.  To verify the accuracy of your analyzer, simply connect the sample line to a cannister of known test gas and ensure that the reading on your controller screen matches the test gas.  Quotes for test gas can be requested via or (910) 415-1880.

  1. Turn generator off.
  2. Close the ball valve connected to sample line at N2 storage tank.
  3. Disconnect sample line from outside of electrical cabinet.
  4. From the PLC (display) on the generator:

1.Press “Menu”

2.Enter Password (6557) and press the bottom right button (return key).

3.Select “sensor setup/calibration.”

4.Select “O2 PPM/% calibration”

For % Units:

1.Enter the contents of your known gas source in the field labeled “0-2% O2 Calibration Gas.”  This will be listed on the Test Gas cannister and is typically 1%.

2.Enter 20.9% in the field labeled “20-22% O2 Calibration Gas.”

For PPM units:

1.Enter the contents of your highest purity (lower PPM) known gas source in the field labeled “O2 PPM Low Calibration.”  This will be listed on the Test Gas cannister and is typically 10 PPM.

2.Enter the contents of your lowest purity (higher PPM) known gas source in the field labeled “800-1000 PPM Cal Gas.”  This will be listed on the Test Gas cannister and is typically 700 PPM.

3.Connect the provided regulator onto your higher purity (10 PPM) known gas source.

4.Connect the provided tubing over the sample line connector on the electrical cabinet.

5.Open the valve on the regulator and allow gas to flow to the analyzer for minimum of 5 minutes.

6.On the PLC there is a value displayed at the bottom of the calibration screen labeled “Current Raw”.

7.Take the “current raw” value and enter it in the top field (low side calibration)

8.Close the valve on the regulator.

9.Switch the regulator to your high side calibration gas.

10.Open the valve and allow gas to flow for 5 minutes.

11.On the PLC there is a value displayed at the bottom of the calibration screen labeled “Current Raw”.

12.Take the “current raw” value and plug in the 2nd field (high side calibration)

13.Close the valve on the regulator.

14.Disconnect the tubing from the sample port.

15.Reconnect your sample line to the sample port.

16.Open the valve on the storage tank feeding the sample line.

This should complete calibration on your analyzer.  If you have trouble or require assistance, please give us a call at 910-415-1880.

Fire Protection

N2-Blast                                                                                                                    Filter Kit

FPS-250, 250FF, 500, 750, 750FF, 900, 1650 FRP-007
FPS-1750, 3000, 6000 FRP-002
FPS-12000, 15000, 18000, 20000, 22500FRP-006
FPS-3250, 5000, 10000 (BLACK FILTER BOWLS) FRP-013
FPS-3250, 5000, 10000 (WHITE FILTER BOWLS)FRP-022

MIC Blast                                                                                       Filter Kit

FPS-20, 50FRP-007
FPS-125, 200, 400FRP-002
FPS-2000, 3000FRP-006


1KPH, 3KPH, 7KPH, 14KPHFRP-001
100, 200FRP-003
100, 200, 400 PLUSFRP-001
600, 800 PLUSFRP-005


35L, 30DFRP-015
70T FRP-017
70L, 90DFRP-016         

Tire Blast

NT-10, NT-20, NT-40FRP-009
NT-130, NT-250 FRP-008                                             

Transmissions Lines

TL-450, TL-1050, TL-1825 FRP-007
TL-1725, TL-2625 FRP-010                                           

Please reach out to the email or phone number below for quotes on any of the above, or if you do not see your particular N2 generator listed.


  1. Systems are warrantied against any defects in workmanship and materials for 12 months (or 1000 hours) from the date of shipment unless an extended warranty was purchased.
  2. The purchaser has the liability to ensure that the system is fully inspected upon delivery and shall contact the appropriate shipping company to make any claims on damaged goods due to transit within that shipping company’s policies.
  3. If the system is received with defects that are not due to shipping, a claim should be submitted
    to South-Tek Systems within 1 week of receiving the shipment. South-Tek Systems can deny all
    other claims at their discretion.  
  4. Any work performed by an unauthorized person/company or usage of non-factory parts
    may void all warranties to the product.
  5. Any item not manufactured by South-Tek i.e., external compressors, may carry its own warranty from its manufacturer and will be warrantied by that manufacturer.
  6. All parts that need to be returned should be announced. Any item(s) that is returned to South-Tek Systems without an RMA number (return authorization number) may be denied and returned to the sender.
  7. Contact the factory for RMA #’s, prior to return shipment. South-Tek Systems is not liable for damages caused by normal wear and tear, water, fire, erosion, corrosion, explosion, misuse, oil/gas vapors or unauthorized modifications. South-Tek Systems is also not liable for any losses (including CO2), damages, or cost of delays, including incidental or consequential damages. There are no warranties or guarantees, expressed or implied, including the warranties of merchantability or fitness for a particular purpose or use, other than those warranties expressed herein.
  1. Power down the unit and confirm that the pressure reading on the gauge above the filters reads 0 PSI.
  2. Disconnect the drain lines from the filter bowls by pushing the orange rings towards the filter bowl, while pulling down on the poly lines.
  3. Unscrew the filter bowls by hand by rotating the outer metal casing clockwise.
  4. Pull down on the plastic filter bowls to remove them from the upper filter housing taking care to remove the O-rings.  The O-rings can be discarded.
  5. The black filter element on the left can be removed from the upper filter housing by rotating clockwise and discarded.
  6. The white filter element on the right can be removed from the plastic filter bowl by gently prying up on the black upper filter assembly with the O-ring removed.   Once removed from the filter bowl, rotate the lower piece of the filter assembly a quarter turn counter clockwise.  The white element can be discarded and replaced and then reassembled.
  7. Fill the plastic filter bowl about half way with warm soapy water and shake with your hand covering the top opening.  Repeat for both bowls.  This will ensure that the float drain is clean and operational.
  8. Remove and replace the O-rings on the lip of the plastic filter bowl.
  9. Install the outer metal casing back onto the plastic filter bowl, taking care to line up the protrusion on the bottom with the opening in the metal casing.
  10. Reinstall the filter housing and casing back into the upper filter assembly.  Only tighten hand tight and do not use a wrench.
  11. Reinstall the poly drain lines by pushing up into the bowl until the push to connect fitting locks the line into place.
  12. The compressor intake filter can be replaced by pushing down on the black filter bowl located on the top of the compressor and rotating counter clockwise.  Take care that the filter housing may be hot.
  13. Turn on the unit and test for any leaks with a a spray bottle and soapy water.
  14. Reset the filter alarm by holding the Down (-) key on the controller for 10-15 seconds.

APS devices should be installed at the end of each zone, as far from the generator as reasonably possible.  You will want to ensure that they are accessible to adjust the purge rate and take purity samples when needed.

It is important that the APS ball valve be closed anytime water is introduced to the zone to prevent the purge from getting clogged.

See attached Field Tuning Guide to correctly set the purge amount.

A full list of O&M manuals, GA drawings, and electrical schematics can be found at for most of our current line of products.  Simply hover your mouse over the respective market you are searching for and look for your model.  All documentation will be found under the “documents” column. If you need documentation on legacy products or additional support, please Contact Us.



Operating Manual Rev4.pdf

General Arrangement Drawing

Spec Sheet


Operating Manual Rev8.pdf

General Arrangement Drawing

Spec Sheet

FPS-1650, FPS-3250, FPS-5000

Operating Manual Rev3.pdf

General Arrangement

Spec Sheet

FPS-10000, FPS-16500, FPS-22500

Operating Manual Rev2.pdf


  1. Pressurize the system while isolating it by closing the valves from your N2 storage tank to your end process as well as any sample lines going back to the cabinet analyzer (if present).
  2. The system should build pressure until the unit reaches standby.  Cut in/out pressures can be found here: What Are My Cut In/Out Pressures?
  3. Once the unit reaches standby, monitor the tank pressure, this should remain static and not drop. 
  4. If tank pressure is dropping or the system struggles to reach stand by, spray any fittings or filter bowls with soapy water looking for bubbles.  Take care to avoid any electrical components inside the cabinet while leak testing.
  5. If a leak is detected on a fitting, tighten NPT fittings, or reseal push to connect fittings by pushing the poly line towards the fitting to see if leak is sealed.  For NPT fittings, additional pipe tape may be required.  For push to connect fittings, simply cutting the end of the poly line by a few centimeters and reinstalling may resolve the issue.
  6. If the leak is unable to be repaired or additional support is needed, please contact us.


XX-040PPH – 60/85

XX-01KPH – 70/75

XX-03KPH – 70/75

XX-07KPH – 70/75

XX-14KPH – 70/75



FPS-00500 – 55/65

FPS-00650 – 55/65

FPS-00900 – 55/65

FPS-01250 – 55/65

FPS-01250-P-A – 60/70

FPS-03250-P-A – 60/100

FPS-05000-P-A – 60/100

FPS-10000-P-A – 60/100

FPS-16500-P-A – 60/100

FPS-22500-P-A – 60/100


Our industrial units are factory set based on customer needs, and therefore vary from system to system.  To find your specific cut in/cut out specifications, please call or email us @ (910) 415-1880, 

  1. Hold or press the green power button on the display until it turns red.
  2. Navigate to the Menu on the PLC.
  • Go to the maintenance menu.
  • Go to valve controls.
  • From here you can manually actuate the bypass valve or any valve in the cabinet. Leave the bypass active or in the on position to bypass the generator.


The following models utilize auto-bypass: FPS-1650, FPS-3250, FPS-5000, FPS-10000, FPS-16500, and FPS-22500

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If you wish to know the full numbers and more information, you can download the pdf below.