The Waters 616 fluid delivery system is now out of production but parts are still readily available from 3rd party sources. The 616 never gained the popularity of the 600 pump but in fact is much better optimized for low flow rates then the 600. Although the specifications from the user manual do not mention the pressure ripple specification, the flow rate is listed at 5ml/min max and the maximum pressure at 5000 PSI. . The controller is nearly identical to the 600 controller but has a another small board and a different set of firmware installed inside. The 616 offers a SILK option that should reduce pressure fluctuations at low flow rates.

Properly rebuilding a 616 system is very capital and labour intense. We can offer these pumps with just a 90 day warranty and a significantly reduced price but you may want to consider a fully rebuilt system with a 2 year warranty. After competent rebuilding these systems are in fact quite reliable and we have successfully completed two year warranties without event.

During the rebuilding process, the following are carried out:

-The Sapphire plungers are replaced
-Plunder seals are replaced
-plunger wash seals are replaced
-The check valves are rebuilt
-Sparge diffusers are replaced
-Teflon sparge tubing is replaced
-Solvent intake filters are replaced
-Teflon solvent tubing is replaced
-New sparge supply line is installed
-Sparge fitting for gas regulator is supplied to customer
-Pump cable is replaced
-Fan Filter media is replaced
-Rubber feet are replaced


At one point all of our prices were posted online. Since the subprime fiasco of 2007 we have had an increasingly difficult time keeping our online prices up to date with the number of currencies that we normally quote in. Worse yet (for us) the prices of many instruments are in a state of flux. At this time(June 2010) we are in a buyer's market, this is an excellent time to buy used instrumentation, with prices approximately 10-15% lower then in 2007. Unfortunately we have had to switch from an online pricing setup to a quote-on-request one.

If you would like a quote on one of our HPLC pumps please let us know if you would like our standard two year warranty or our optional 90 day warranty. Please note that only the parts needed to return functionality to the pump are replaced with the 90 day warranty, while parts are proactively replaced with are standard two year warranty.

If you have any questions at all please don't hesitate to contact us. Our sales people will never "follow up" with you afterwards and if you contact us by email we will never add you to our spam list. We do not and will not, ever have one.

If you could please send an email to info@2h2inc.com we should be able to provide a quote to you within a few hours or please visit our contact page for our telephone number and mailing address

In addition you might want to visit our page for more HPLC related items.