ParrNotes Newsletter Vol.3 No.2


A Quarterly Newsletter of Parr Instrument Company | June Edition 2016 | Vol. 3 No. 2


Features and Benefits
Service Tips
Controller Section
Application Awareness
Parr Team Member Focus
Upcoming Events

Features and Benefits

Turbine Type Impeller
Turbine Type Impeller

Liquid Agitation

Parr’s stirred batch reactors rely on effective agitation in order to achieve successful results. Parr offers various impeller designs to accommodate different stirring requirements. Viscosity is one of the factors that is considered when selecting an agitator. Another important aspect in agitator selection is the power required to rotate the impeller. Our new Liquid Agitation Tech Note describes one typical procedure used to estimate these power requirements and offers actual performance data for a large Parr reactor using a variety of agitators and two different drive assemblies.

Download Tech Note 231: Liquid Agitation to read more about agitation impeller selection and the power requirements to drive them.

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Service Tips

Service Fixtures for Parr Reactor Heads and Cylinders

Service Fixtures 2897HC for 5000's, 2583HC for 4560's, 2589HC for 5110's, and 2584HC for 4520/4530's
Service Fixtures from left to right:
2897HC for 5000’s, 2583HC for 4560’s, 2589HC for 5110’s, and 2584HC for 4520/4530’s

Parr Instrument Company has service fixtures available for our reactor heads and cylinders. These fixtures allow the service technician or end user to safely grasp the head or cylinder in a bench mounted vise to aid in assembling or disassembling reactor components. Each fixture is designed to hold the cylinder and head making it so only one fixture is needed per series size. In addition, rotating the fixture to an upright position allows convenient access to the underside of the head.

Head shown in Fixture
Head in Service Fixture
Head shown rotated in Fixture
Head Rotated in Fixture

These devices come in a variety of size ranges (for bench mounted vise) to accommodate reactors as small as the MRS 5000 all the way up to our 2 liter 4520/30 Series. Larger diameter reactors like the 4550, 4555 and 4580 Series will require their own table mounted fixture as the jaws of a standard vise will not open far enough to hold the device.

Table Mounted Fixture for 4555 Series
Table Mounted Fixture for 4555 Series
Table Mounted Fixture for 4550 & 4580 Series
Table Mounted Fixture for 4550 & 4580 Series

Part numbers for the service fixtures and our other service tools may be found in our new Tech Note 307: Parr Service Clamps, Fixtures, and Tools.

For pricing and further information on any of our service tools, please contact one of our skilled Sales Representatives and we will be happy to help.

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Controller Section

MTM vs SpecView

4848B Reactor Controller with six panel meters
4848B Reactor Controller with six panel meters
including the MTM Motor Output

The Motor Torque Module (MTM) has been offered since the inception of the 4848 Controller as an optional accompanying meter to the Motor Control Module (MCM). The MCM makes use of the fact that the Delta meters which power the 4848 Controller can handle a PID control loop, and allow full closed loop control based on the desired set point. The MCM’s main benefit is that the user can put in a single set point, and the controller will maintain it, adjusting motor power automatically if the mixing load changes.

The stereotypical example is a polymerization, where the viscosity increases significantly over the course of the reaction. The MCM will sense if the RPM drops, and increase power to the motor to maintain the desired stirring speed.

With this setup, there is value in watching the motor output over time. The MCM’s output will change as the mixing load changes, and although it cannot be translated into a measure of torque or viscosity, this curve does give an indication of whether the viscosity is increasing or decreasing.

The MTM was originally designed to solve a software problem. When the 4848 was first released, the free ParrCom software that accompanied it was capable of logging data, but it would only log the process value of the meter. So, in the MCM’s case, it would log the RPM, but it would not log the output percent. This meant there was no way to produce a chart showing the motor output percent, even with an MCM. The solution at the time was the MTM, which attaches to the output of the MCM, and displays the output percent in real time. The MTM’s process value was the MCM’s output percent, allowing it to now be logged by the ParrCom software.

Once SpecView software was available for the 4848, the MTM became less critical. This premium software is capable of logging any of the variables in the Delta meter, so it can log the MCM’s output percent directly. With SpecView, the MTM is not needed to log the motor output percent. SpecView also has the additional benefit of adding excellent data logging to the 4848 Controller for motor output and other meters.

Today, the MTM has value mostly for operators that are located near the 4848, but not near a PC. In this case the MTM meter provides a physical display on the 4848 face showing the output percent, so the operator can see when an expected motor output change has occurred and the reaction is complete.

Please contact us for further information on Parr controllers.

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Application Awareness

Stirred Reactors, Pressure Vessels, and Reactor Systems

Common applications for Parr’s pressure equipment include:

  • Pharmaceuticals
  • Polymers
  • Petroleum and Petrochemicals
  • Food and Agricultural Products
  • Catalyst Development and Testing
  • Hydrometallurgy
  • Universities and Research Institutes
  • Flavors and Fragrances
  • Life Sciences
  • Specialty and Commodity Chemicals
  • Nano-Technology

Download our recently revised Tech Note 200: Industries and Applications for Stirred Reactors, Pressure Vessels, and Reactor Systems to learn more about reactor applications.

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Parr Team Member Focus

Diane Wiederholt
Diane Wiederholt

Diane Wiederholt, Export Documentation

Diane is originally from Dubuque, Iowa which is about an hour and a half north of our facilities in Moline, Illinois. Diane spent a number of years living and going to school in Hawaii. While in Hawaii she received her Bachelor of Science degree from Hawaii Pacific University in Honolulu and Associates and Liberal Arts degrees from Windward Community College in Kaneohe, Hawaii.

As Parr’s Export Documentation specialist, all of our international orders pass through Diane prior to shipping for various documentation purposes, logistics arrangements, and/or resolution of international shipping problems. She also handles accounting issues for our international customers as they arise.

Diane has worked at Parr for over 20 years and says the people are what she enjoys most about her job. “There’s a good group here and I enjoy seeing everyone on a daily basis. In addition, I’ve had an opportunity to meet a lot of people from around the world and regard many of them as friends. Finally, I’ve developed close relationships with many freight forwarders over the years.”

Other aspects that Diane appreciates about working for Parr include the size of the company and the benefits provided. She stated that “Parr Instrument Company is just small enough that I’ve had the opportunity to meet most of the people working here. When we have social events we get to meet many of the spouses and kids. That’s not easy to do at a larger company. The benefits are terrific and as a result, I get to actually think about retiring in a few years!”

Parr Instrument Company, our dealers, and international customers have all benefited from having Diane as part of our team and thank her for helping to keep our international shipments moving.

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Upcoming Events

Parr's Andrei Yermalayeu (pictured on the left) with a visitor at ACS Spring 2016 in San Diego
Parr’s Andrei Yermalayeu (pictured on the left) with a visitor at ACS Spring 2016 in San Diego

24th International Symposium on Chemical Reaction Engineering
(ISCRE 24)
June 12 – 15, 2016
Minneapolis, Minnesota

16th International Congress on Catalysis (ICC 16)
July 3 – 8, 2016
Beijing, China
Booth #11
Look for our representatives from Beijing East Sunland S&T Co., Ltd., Parr GmbH, and Parr U.S.A.

252nd American Chemical Society National Meeting and Exposition
August 21 – 25, 2016
Philadelphia, Pennsylvania
Booth #1101

IndiaChem 2016
September 1 – 3, 2016
Mumbai, India
Look for our representatives from Orbit Technologies Pvt. Ltd. and Parr U.S.A.

View our complete 2016 Trade Show schedule.

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