Obsolete Industrial Automation Parts — Supplier

On Line Controls, Inc. supplies MicroAir ultra-low air pressure regulators and motorized potentiometers used in industrial control and plastic tubing extrusion applications. Available MicroAir models include MicroAir I, MicroAir II, and MicroAir IV, with single through four-channel configurations. OLC also sells DC and AC motorized potentiometers with various voltages, RPMs, resistance values, turn counts, and gang options.

Yes. OLC repairs or rebuilds motorized potentiometers built by On Line Controls, Inc. The service department also tries to repair older OEM ETI motorized potentiometers, including MC, MAC, and ME series units from the 1980s and 1990s. Repair feasibility depends on the condition of the unit and whether the required replacement parts are still available.

Most MicroAir pressure units less than 10 years old can usually be serviced, often in one day after receipt and testing. Older units may be sent in for evaluation. However, MicroAir units with serial numbers lower than 7000 are not repairable because the internal body has typically been worn out after roughly 20 years of use.

For MicroAir repairs, OLC provides the cost after the unit is received and tested. If the unit is outside the warranty period, a purchase order may be required before repair work proceeds. Units shipped with oil may incur an added cleanup charge, so customers should prepare and package equipment carefully before sending it in.

Yes. On Line Controls, Inc. sells directly worldwide and can ship products using UPS, DHL, or FedEx. The company serves customers across the United States and many international markets, including Canada, Mexico, Germany, France, China, Japan, South Korea, India, Switzerland, and other manufacturing regions where precision extrusion controls are required.

All MicroAir units are covered by a three-year manufacturer’s warranty on parts and labor. This warranty supports the product’s reputation for durability, low maintenance, and stable operation. OLC also includes unlimited phone support with purchase, helping customers troubleshoot installation, pressure control, maintenance, and operating questions throughout the product lifecycle.

Provide the model name, serial number, voltage, motor type, RPM, potentiometer resistance, turn count, channel count, pressure range, control signal, and application details when available. For MicroAir units, the serial number is especially important for repair eligibility. Clear photos and a description of the failure can also speed evaluation.

OLC products are used by medical tubing extrusion companies, catheter manufacturers, plastic tubing producers, automotive tubing manufacturers, and extrusion OEMs. MicroAir regulators are especially valuable where precise internal air support helps control tubing outside diameter. Motorized potentiometers support industrial adjustment applications requiring dependable remote control and stable performance.