About Neptune Controls

Neptune Controls has been in business providing industry with high quality Honeywell recycled and surplus parts since 2002. With over 15 years experience with the Honeywell TDC system, our management is committed to reducing our customers costs to maintain the best control system ever produced.

Mission Statement

To provide our customers with the highest quality and lowest cost Honeywell TDC parts to reduce the cost to maintain their system.

Core Values

From our first day in operation, we believe we are building a respected and valued parts provider in the process industry. Our core values form the basis used when making decisions in our dealings with ourselves, our suppliers, and our customers.


In all of our business dealings, clear, accurate and timely communication is our goal.


Ethical conduct transcends our size and the growth rate of our company. Maintaining this, we preserve what is special about our company.


Exceeding the expectation of our customers turns our customers into advocates for our business.


Respecting people of all nationalities and cultures, we treat others as we hope to be treated ourselves.


By maintaining the highest level of honesty, principles and ethical conduct, the trust of our customers is our reward.

Quality Policy

All surplus parts have been removed from fully operational systems and well maintained inventories. No modifications have been made to the boards. We do not sell refurbished or repaired boards.


A one-year warranty is included on all parts.


Neptune Controls has the best prices for surplus Honeywell TDC 2000 & TDC 3000 parts in the world. We guarantee our prices to be the lowest. We will match any written competitive price for items in stock and provide you with an additional 5% discount.

We Also Purchase

Send us your list of Honeywell TDC 2000 & TDC 3000 parts with part numbers or model numbers.