Like Oil and Water, and Ethylbenzene?

Chemical Resistance Compatibility

Tips From the Service Bench

Technology TIP

When pumping liquids, you must be sure flow path wetted materials are compatible with intended media. If not researched and tested, issues may arise in the field that may impact product life and maintenance schedules.

While Chemical Compatibility Charts are a good place to start your research, there is typically a standard disclaimer at the bottom that limits their application and places the responsibility on you the buyer, such as:

Warning: The information in this chart is to be used as a guide, ONLY. Although believed to be accurate, actual decisions on material selection need to be thoroughly tested and evaluated by the customer for each specific application. It is the full responsibility of the customer to perform and evaluate the compatibility of materials for their specific requirements. The manufacturer takes no responsibility, etc., etc…


ARE WE COMPATIBLE?

Polymer components exposed to incompatible media can experience swelling or loss of physical properties. When severe, these effects can lead to degradation of pump performance, reduced pump life, leakage, and even pump failure. These issues are avoided with proper material selection. Many pump manufacturers provide a selection of flow path materials to meet most needs, and some provide additional material options for exceptional cases.

TESTING OUR RELATIONSHIP

So, how do you go about testing chemical compatibility? You can get test swatches of possible polymer materials. But, results using test swatches can be less than applicable since they may be much thinner or thicker than the actual parts used in pumps. KNF offers a better way to assist your compatibility decisions, with our Chemical Resistance Test Kit (p/n 173610). This kit contains our most popular head plates and elastomer valves materials. These are actual production parts in current use, so they offer the best test subjects possible. For each material, two parts are supplied – one for resistance testing, the other as a comparison reference. Simple instructions will guide you through the static soak test process.

Chemical Resistance Kit Materials

Kit materials: (1) PEEK (2) PPS (3) PVDF (4) PP (5) FFKM-A (6) FKM (7) EPDM (8) FFKM-B (9) FFKM-C

SUMMARY

In a typical fluidic system, component lifetime will be influenced by several variables beyond simple compatibility of the liquid media, including chemical concentration, liquid temperature, operating pressure, flow rate, and exposure to abrasive materials. A static soak test cannot, therefore, replace a long-term validation test with a pump running in a real system under system parameters. But, a static soak test is well suited as part of an initial screening to identify and eliminate materials which are clearly incompatible with expected liquids.

Contact KNF today for a Chemical Resistant Test Kit and get pumping with confidence!

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New Flow-Tight, Diaphragm Liquid Transfer Pump Prevents Uncontrolled Flow

New, FL 10 Diaphragm Liquid Transfer Pump Prevents Uncontrolled Flow

KNF’s newest liquid transfer pump, the FL 10, is leak-tight in both directions, preventing uncontrolled flow and back-flow of liquid media when not in use. The latest addition to KNF’s extensive line of diaphragm liquid transfer pumps, the FL 10 offers many advanced features, and provides a considerable advantages over similar competitive products.

Leak-tight Diaphragm Liquid Transfer Pump

Featuring a solenoid-drive, and leak-tight valve technology, the compact FL 10 liquid transfer pump displaces fluid at a flow rate of 0 – 100 mL/min. Additionally, a signal frequency modulation feature enables quick and easy flow rate adjustments, saving time and money. Finally, like all KNF diaphragm liquid handling pumps, the FL 10 is self-priming, dry-run safe, and maintenance-free – offering outstanding performance longevity and an extraordinarily long service life (10,000 hours or 1.8 billion strokes).

To learn more about the leak-tight FL 10 liquid transfer pump visit knfusa.com/FL10

College Students Use KNF Pumps to Fuel Racing Success

Wisconsin undergraduates have a need for speed.

Students from the Milwaukee School of Engineering (MSOE) have been getting in the competitive spirit in an effort to create and race the most energy-efficient cars.

Consisting of undergraduates ranging from freshmen through juniors, these students are part of their university’s Society of Automotive Engineers (SAE) branch. As the organization operates solely on outside funding, KNF has sponsored these adventurous and ambitious students in their racing endeavors through the donation of needed liquid diaphragm pumps.

Joe Pechstein and team pose for a photo at the Shell Eco-marathon flanked by their vehicles.

Overseen by project manager Joe Pechstein, a junior, the group participates in two annual events: the Shell Eco-marathon, which took place in April 2017, and the SAE Supermileage competition, which took place in June 2017. Continuing an almost ten-year tradition of entering these selective competitions, Pechstein supervises the building of two vehicles for the former competition and one vehicle for the latter.

The mechanical engineering major recognizes the challenges involved, stating that the race is “a test of the driver’s skill, the design’s endurance, and the design itself.” With all design and testing done by students, the competitions represent the future of motor engineering.

To get the highest fuel economy possible while still meeting lap times, these twenty-five students use KNF’s NF 1.25 RPDC for their fuel system. These compact and powerful KNF pumps are used for engine dynamometer testing which typically determines the torque or power characteristics of a machine under test. Though dynamometers can also be used for standard emissions testing cycles such as those defined by the United States Environmental Protection Agency. The vehicle itself is a three-wheeled device with optimal aerodynamic features. Convenient in its small and lightweight design, the KNF pumps allow for an appropriate pressure range and high enough fuel output to guarantee full speed ahead.

A photo of the course which is usually a motor racing track or a closed off city street.

How did these students fare in the competitions? At the Shell Eco-marathon, the gasoline vehicle came in 14th place out of 30 at 588 mpg, while the electric vehicle came in 9th place out of 17 at 120 mi/kwh. Having made their mark in the gasoline vehicle category, Pechstein admits that “we have been steadily improving our fuel economy over the past three years.” In the SuperMileage competition, they came in 8th place out of 16 at 442 mpg, and an impressive 3rd place in their design report. Of KNF’s contribution, Pechstein adds that “the pumps were ideal” in helping to reach the finish line.

The team at KNF offers our congratulations to MSOE’s Society of Automotive Engineers! We know they have a bright future ahead.

Liquid Waste Handling in Clinical Diagnostics and Lab Equipment

A new Application Note from KNF Neuberger, Inc. details effective methods for collecting, and evacuating liquid waste.

oem_application_noteWhen determining how to transfer liquid waste within an analyzer, design engineers must examine many factors. Though several methods will work, only one provides optimized system performance and lifetime.

Read more >>

 

KNF to Host Lab Pumps & Applications Symposium in Collaboration with Local ACS

Pumps are an important component in practically all chemistry laboratories. Yet for such a common device, selecting the correct pump for a particular application is often a challenge.

Join us for a Laboratory Pumps and Applications Symposium

Join us on Nov. 4th for a Laboratory Pumps & Applications Symposium

KNF Neuberger, in collaboration with the Trenton Section of the American Chemical Society, will be hosting a symposium on “Laboratory Pumps and Applications”. The presentation will focus on taking the mystery out of laboratory pumps, looking at the most common applications and the pumps that best support them. Discussion topics include:

  • What is the best pump type for my application?
  • What accessories are available to help me optimize the performance of the pump in my application?
  • What are the signs that my pump is in need of maintenance or repair?
  • And much more!


LOCATION

This exclusive, co-sponsored event will be held at KNF’s state-of-the-art, 50,000 square ft. manufacturing facility at Two Black Forest Road in Trenton, NJ.

SCHEDULE
5:30 pm – Mixer with drinks and appetizers, plant tours and product demos
6:30 pm – Dinner and presentation
7:30 pm – Coffee and dessert
Refreshments and dinner are complimentary. There will also be a drawing for door prizes.

PRESENTER
Roland Anderson is the Laboratory Products Manager and applications specialist at KNF Neuberger, Inc.

RSVP
Reservations are required, as seating is limited, so be sure to register now!

Flexibility is Key: The NFB Family of OEM Pumps Expands with Two New Low-Flow, Compact Models

NFB boxer-type liquid pumps

Full line of NFB boxer-type OEM liquid pumps

With the recent introduction of NFB 5 and NFB 25, this powerful, compact line of two-head-one-motor boxer pumps now boasts a wider flow rate range of 5 mL/min to 1.3 L/min per head.

This widened range offers further flexibility to the already gymnast-like abilities of this versatile line of products, such as:

 

  • The boxer configuration offers the flexibility of two possible operating modes.
    1) In parallel mode, the alternating pump head operation results in smooth, even flow.
    2) In individual mode, two liquids can be transferred simultaneously.
  • An adjustable-speed brushless DC motor adds flexibility, allowing simple flow rate regulation, which helps to reduce lengthy testing, while improving time to market.
  • Further instrument integration flexibility is assured by the small size, two-for-one design…
  • …and the ability of these pumps to operate in any orientation.
  • The two-for-one design and long product life also create cost savings potential.
  • Need more flexibility? Contact a KNF engineer to discuss your specific design needs.

OK, after reading about all of that flexibility, it’s probably time for a nice cool-down stretch! Then, click here to learn more about the flexible, expanded line of KNF NFB boxer pumps.

A widened range of boxer pumps offers further flexibility to the already gymnast-like abilities of this versatile product line.

A widened range of boxer pumps offers further flexibility to the already gymnast-like abilities of this versatile product line.

Enhanced Line of Liquid Laboratory Pumps

It’s day two here at #pittcon15 in New Orleans. If you are here at the conference and have not yet had a chance to stop by KNF booth #2211, please plan to do so. One of our features at this year’s show is the recently enhanced line of SIMDOS 10 liquid laboratory pumps.

KNF's SIMDOS 10 liquid laboratory pump

SIMDOS 10 pumps are ideal for metering and dosing applications in a number of professional and academic fields, including: chemistry, pharmaceutical, food research, and polymers, to name a few. SIMDOS 10 pumps offer lab personnel the ability to transfer liquids (up to 500 centistokes*) at flow rates of 1-100 mL/min, with dose volumes from 1 mL to 999 mL.

“While the SIMDOS 10 and SIMDOS 02 pumps can move liquids quickly and accurately, their real strengths are configuration and control options which can be matched to a user’s automation requirements and/or chemical profile” said Dan McDougall, Senior Manager of Laboratory Products at KNF. Indeed the SIMDOS pumps are designed to allow for convenient control of lab metering/dosing tasks which may be repetitive and redundant.

For example, new to this latest version of the SIMDOS 10 is a Cycle Metering Mode. “Say you’re performing an automated fill of vials on a conveyor belt…”, explains MacDougall. “You can program the SIMDOS to dispense a discrete volume into each vial with set pause durations in-between.” This new feature allows the user to set the number of cycles, the pause duration, and the dosing volume.

In addition to the added convenience of the Cycle Metering Mode, there are a few new control type options now available for the  SIMDOS 10. First, the SIMDOS 10 is now available in an RCP-version, which includes a RS 232 interface, enabling ASCII character control of virtually all pump functions, plus the ability to use programmable lab control software such as LABVIEW, or KNF’s free PC control software (available for download at knfusa.com). Next, an RC-version is available, which includes an RC cable for external control options such as a foot switch, or analog PC control. Finally, the standard S-version of the SIMDOS relies on the manual on-board interface with back-lit display for intuitive, push-button operation.

For a demonstration of the SIMDOS 10 and 02 lab liquid pumps, click the video below courtesy of Jean Delteil, KNF Liquid Pumps Product Manager; or stop by PITTCON booth #2211 for a live demo.

* Please visit knfusa.com/SIMDOS10 for detailed performance specifications.

KNF Demo to Debut at SLAS 2015

In just a few short days, some of us here at KNF will be leaving for our nation’s capital to attend the 4th annual SLAS Conference and Exhibition, being held from February 8th-10th. We are particularly excited about this year’s SLAS event as we will be unveiling a brand new demonstration at the KNF Neuberger booth (# 1511).

The new KNF demonstration effectively showcases a number of real-world pump applications, including: direct liquid transfer, vacuum aspiration, and pneumatics via 3 unique KNF pumps. When initiated, the demo cycles continuously through three separate stages. Light-up placards provide clarity for the viewer by explicitly stating which of the following processes is being performed in the demo:

KNF Pump Applications Demo

The KNF demo cycles through Vacuum Aspiration, Onboard Pneumatics, & Direct Liquid Transfer.

1) Vacuum Aspiration– The first process (pictured right) shows fluid being aspirated by the suction created from a powerful vacuum pump. You may notice the system’s ability to generate vacuum-over-liquid easily and quickly – this is due to the selection of a pump with a high gas flow rate, and the ability to handle moist gas with slugs of liquid.

2) Onboard Pneumatics– The next stage demonstrates high pneumatic performance in a compact, quiet and energy-efficient manner. The system employs a micro gas pump to pressurize a pneumatic cylinder which, in turn, raises a tube – a similar function to needle aspiration which is performed for various medical applications.

3) Direct Liquid Transfer– The 3rd process demonstrates direct liquid transfer, using a diaphragm liquid pump. Here, direct transfer of liquid media is made possible using a specially-designed, two-headed pump with high self-priming ability, and smooth flow – ideal for demanding, real-world applications, such as direct handling of liquid waste.

While each stage of the demo illustrates a unique application, it’s important to note the commonalities amongst the stages: First, each pump/stage includes chemically-resistant materials, which allow for the transfer of aggressive media. Each pump also utilizes a brushless DC (BLDC) motor. The BLDC motor (available for most KNF pumps) enables more precise speed control, lowers audible noise and vibration, and promotes a longer lifetime of operation. Also, a new KNF Digital Control provides enhanced programmable features over previous analog controllers while promoting consistent performance and reliability. Tested to over 1.6 million on/off cycles and 100,000+ hours in pump life tests, the KNF Digital Controller offers superior performance in demanding applications.


If you’re going to be at SLAS next week please stop by the KNF Neuberger booth (#1511) to check out our new demo, and to learn more about KNF’s range of gas and liquid OEM pumps.

Selecting the Proper Pressure Control Valve

KNF FDV Valves with PVDF materials

KNF FDV Valves with PVDF materials

Before deciding on the appropriate diaphragm pressure control valve for your application, it is important to first understand some of the basic uses of these devices. Gaining a better understanding of how a pressure control valve works, and determining how one can best suit your specific application, will simplify the selection process.

What Does a Pressure Control Valve Do?

When used in tandem with a pump, a pressure control valve provides more accurate control over the pressure supplied by the pump. Generally, pressure control valves can be used in the following 2 ways, depending on the application:

1) Pressure Control

A pressure control valve can be used to maintain constant back pressure for exact flow rates under free flow conditions, with positive pressure on the inlet side or with varying back pressure, or with the operation under vacuum, etc.

2) Bypass Valve

A pressure control valve can serve as a safety device for protection of a system’s pump, motor, tubing and connections, vessels and other accessories. Installed as a bypass valve, it prevents excessive pressure build up in the system caused by dirt, misuse or other problems.

Read more…

Making the Right Choice for Drop-on-Demand Inkjet Printing

KNF has supplied the drop-on-demand inkjet printing market with optimized liquid and gas/vacuum pumps since its infancy. Overtime, the market has developed, and we’ve accumulated an in-depth knowledge of these printing systems by working directly with designers to develop pumps best suited for several critical functions. We’re proud to have contributed to the market’s successful evolution, which now includes commercial printers and decorators, 3D printers, bio-material dispensing, single-pass printing, ceramics, and printed electronics.

Typical functions that our pumps perform in drop-on-demand inkjet applications include:

  • Bulk ink supply/replenish
  • Ink degassing
  • System vacuum
  • Cleaning station
  • Ink recirculation
  • Print head temperature control
  • Liquid laminate delivery
  • Media pre-treatment
  • Anti-siphon at head

Whether your application calls for tolerance to special inks, high temperature pump heads, special electrical or mounting connections, or other unique requirements, count on KNF engineers to build a pump to fit your specific inkjet printer needs. We’re here to help you cut costs, and to integrate our pumps into your printer control systems.

View the complete Application Note for more information, including a list of KNF pumps for drop-on-demand inkjet printing