N2GEN-FLEX Series Controls and Touchscreen Navigation – South-Tek Systems

This article applies to South-Tek Systems industrial N2GEN-FLEX series PSA nitrogen generators.

The N2GEN-FLEX series uses a touchscreen HMI to display operating data, view alarms, review maintenance timers, and access user settings. This article provides a general overview of the main screens and what each one is used for.

Home screen

When the touchscreen powers on, it opens to the Home screen. From this screen, the operator can select the display language and continue to the main operating screens.

Available languages: English, Spanish, and French
Select the preferred language, then press Continue

Status screen

The Status screen is the main operating screen for the generator. It displays key live system values and includes the control used to turn the system on and off.

Nitrogen pressure
Nitrogen purity
Flow rate

Depending on system configuration, additional values may also be shown, such as dew point, temperature, or cumulative flow.

Before starting the system, confirm that the E-Stop is released and that the touchscreen is active. After shutting the system down from the touchscreen, do not restart it until the programmed shutdown delay has cleared.

Maintenance screen

The Maintenance screen shows the main maintenance counters used to track system service intervals.

Total running hours
Time before next scheduled maintenance
Filter usage

These values are used to help track routine preventive maintenance. Maintenance and filter counters should only be reset after the required service has been completed.

Alarm Record screen

The Alarm Record screen shows the date and time of recorded alarm events and includes reset functions for alarm-related counters.

Maintenance-related alarms should only be reset after service has been performed. If an alarm condition is active or repeats, do not clear it without first identifying the cause.

Current or Historical Curve screen

This screen shows trend graphs for the system’s key operating values. Depending on software version, it may be labeled Current Curve or Historical Curve.

Purity trend
Flow rate trend
Pressure trend

This screen is useful for reviewing how the generator has been performing over time and for identifying changes in operating behavior.

Historical Data screen

The Historical Data screen displays stored operating records for pressure, purity, and flow rate.

The user can also set the data storage interval on this screen. This controls how frequently the system records operating data.

User Settings screen

The User Settings area contains system operating setpoints and timers. A user password is required to access this section.

User password: 2588

The User Settings screens may include values such as:

Shutdown delay
Low pressure alarm setting
Starting and stopping pressure
Starting and stopping flow rate
Purity alarm timing
Purity discharge rate
Maintenance and filter maintenance timers
Date and time settings

Some communication and serial port fields are not used for normal operation and should not be changed. Start/Stop mode settings should also not be changed unless specifically directed by South-Tek Systems.

Standby mode settings

The N2GEN-FLEX system can be set to enter standby mode based on either tank pressure or flow rate, depending on how the system has been configured.

Standby control should be based on one method only. It should not be set to operate from both pressure and flow rate at the same time unless specifically directed by South-Tek Systems.

N2 Process screen

The N2 Process screen provides a live visual of the generator process flow. It shows which valves are open and the current gas flow path through the system.

This screen can be useful when reviewing normal cycling behavior during system operation.

Test screens

The Test screens are intended for authorized personnel only. These screens are used for factory-level settings such as timing sequence adjustments, analyzer selection, and calibration values.

A factory password is required to access these screens. Do not modify Test screen values unless specifically directed by South-Tek Systems.

Calibration note

Some systems allow calibration adjustments for purity, pressure, and flow rate. These values are intended to correct differences between the touchscreen display and the connected digital transducers or instruments.

Calibration values should only be adjusted by authorized personnel. Improper changes may affect displayed readings and system operation.

Important operating reminder

The system is factory tuned to perform as specified. Do not adjust valves, regulators, analyzer settings, calibration values, or PLC settings without consulting South-Tek Systems.

Full manual

For full operating, installation, and maintenance guidance, download the complete O&M manual below.

Need additional support?

If you need help interpreting touchscreen values or reviewing system settings, contact South-Tek Systems Service.

Phone: (910) 415-1880
Email: support@southteksystems911.zendesk.com