• Sealed design to guard against contamination and meet ISO 5 (Class 100) particle standards
• Motorized lifters raise, lower and level the work surface at the push of a button
• Improved ergonomics for all users, allows for changes in position throughout the workday
• Mounted controls for easy operation even while seated
• Safely supports heavy process equipment, up to 880 lbs.
• Standard and vibration-free units available
• Grade 304 stainless steel top and base
• Isolated shock bumper (vibration-isolated models) provides a convenient arm rest while minimizing table vibration
• Height-adjustable from 28" to 43"
• Lifting speed of 0.5" per second
• Optional locking casters available for portability
• For Perforated Models:
• Perforated Tops, feature 0.25"-diameter perforations
• Perforations open up 40% of the total surface for airflow
Adjustability means nothing if it's inconvenient or unfeasible.
True, many benches feature telescopic legs, but how likely is an operator to perform a manual adjustment if it means temporarily relocating heavy, expensive process equipment? How many helping hands are required? How long will it disrupt critical process operations? And how long will it be before someone else wants the bench just the way it was?
Adjustable cleanroom chairs help solve these problems, but in many cleanroom applications, a chair just isn't enough. Many test and assembly procedures require adjustment outside the range of most adjustable chairs, forcing an operator to hunch to meet the occasion. Other processes require that an operator stand or move from one position to another, so that chairs of any kind aren't much help. When frequent adjustment entails moving heavy equipment worth many thousands of dollars, the temptation is to let someone suffer—and risk a back injury, lost productivity, even lawsuits.
Note: Because the ErgoHeight Work Bench requires a steady benchtop for safe operation, it is not recommended for use with an over-head light fixture.
The ErgoHeight incorporates a high-torque, low RPM motor inside two lifters located on the right and left sides of the table. Each lifter can safely handle 440 pounds (199.6 kg) of net load, for a total net load of 880 pounds (399.2 kg). Lifting speed is 0.5"/second.
A control panel mounted on the front of the benchtop frame contains all necessary switches for up/down table motion and to level the work surface. This option is ideal for use with process equipment that requires height adjustment to suit individual operators, as well as for leveling the system or interfacing it with adjacent operations. Program up to four pre-set positions.
Standard ErgoHeight work stations are height-adjustable from 28" to 43" (711 mm to 1092 mm), floor to work surface. Vibration-free height range is 30.375" to 51.375" (772 mm to 1305 mm) floor-to-top.
All parts are designed for use in a cleanroom environment. The thermally protected lifters are completely sealed inside the legs to ensure particle retention and cleanroom compatibility. And because an ErgoHeight Work Station provides smooth, controlled height adjustment under virtually any load, it allows automatic height adjustment of vibration-sensitive equipment. Typically you can bring delicate test equipment, even liquids, to the optimal level without lengthy disruption, thereby making the most of expensive cleanroom time. For enhanced vibration isolation in microscope operations, select Terra's Vibration-Free ErgoHeight Station.
The ErgoHeight Cleanroom Work Station is available with a variety of bench tops to suit your particular application requirement.
This document provides a description of the electropolishing procedures performed by Terra Universal. It also specifies a series of criteria for evaluating the integrity and cleanliness of the electropolished surfaces. Because these electropolishing procedures are followed on all work performed by Terra Universal, the results may be understood as indicative of standard Terra Universal electropolishing, and the specified evaluation criteria may be used as acceptance standards for work performed by Terra Universal.
Electropolishing is a reverse plating procedure that entails the electrochemical removal of metal (including carbon, silica, iron, and other impurities) from a stainless steel surface.
Prior to electropolishing, parts are mechanically prepared to ensure optimal results. All welds are ground, deburred, and inspected to ensure that all seams are free of pockets or gaps. Finally, selected surfaces are mechanically buffed to a smooth finish.
Next, the part is fitted with electrodes, immersed in an electrolyte solution, and subjected to a direct electrical current. During this electrolytic process, the metallic surface of the the anodic part is removed ion by ion, yielding a nickel and chromium-rich surface free of microscopic “peaks” or “valleys” that could lead to metal fatigue or contamination. Optimal results depend on careful control over the current density, the precise chemical composition of the electrolytic solution, and the temperature and agitation of the bath, and the duration of current exposure.
Unlike mechanically finished stainless steel, electropolished surfaces feature no fine directional lines and hence offer less friction and surface drag. The chromium-rich surface offers excellent light reflection, yielding a bright, smooth and uniform polish.
Terra Universal electropolishing is carefully controlled in each of the following areas to ensure the finest results possible.
Precleaning and Postcleaning: For optimal results, it is important that all surfaces be uniformly exposed to the electrolyte solution, but also that provisions be made to remove all traces of the solution following electropolishing. Failure to remove the solution can result in subsequent outgassing unacceptable in a clean room environment.
Stainless steel parts intended for electropolishing are designed with these requirements in mind. All welds are carefully inspected to ensure continuous seams, free of pits or gaps where the solution could collect, and all hollow members are drilled to permit effective flushing of the solution after electropolishing.
Because the electropolishing process removes only a very thin surface layer (typically between 0.001" and 0.0001"), selected surfaces are mechanically buffed, using progressively finer grits to produce the smoothest possible finish.
Following electropolishing, all traces of the electrolyte solution are thoroughly removed from the part, and any hollow cavities are flushed to eliminate the chance of subsequent outgassing. Surfaces are then dried and buffed with a soft, non-particulating cloth.
Process Controls: The more rigorously the electropolishing process variables are controlled, the higher the quality that can be expected in the finished product.
Some of these variables are relatively easy to quantify and monitor, although some variation must be exercised in response to a given sample in order to produce the optimal results.
Electrolyte Bath: The chemistry of the bath must be constantly monitored, with special attention to the specific gravity (an indicator of water content), the acid concentration, and the metals content.
Current: A supply of clean, ripple-free DC power must be available to drive the process, as well as appropriately sized cables and connectors to the anodes and cathodes. Current density (amperes/square foot) must be carefully monitored and regulated.
For other variables, effective control depends on significant experience. Attention to these considerations, combined with close adherence to the procedures mentioned above, results in a truly superior electropolished finish.
Electrode Positioning: Electrode placement is critical to the success of the electropolishing process. Although electrode clamping of objects with a uniform geometrical shape is generally a straightforward task, irregularly shaped objects, which often contain inaccessible cavities or areas exposed to low current densities, present special challenges. Only an experienced technician, equipped with versatile electrode fittings, can ensure optimal results in these situations.
Visual Inspection: The first and most obvious test of the effectiveness of the electropolishing is a close visual inspection. In a closely controlled process performed on high-quality material that is adequately prepared for electropolishing, the surface will appear uniformly brilliant, with no detectable pits, streaks, erosion, "frosting", or other anomalies.
Unlike mechanical buffing, which distorts the surface of the metal and may conceal the material’s true characteristics, electropolishing reveals the imperfections in the structure of the stainless steel. Electropolishing will accentuate any welding flaws, and a nonuniform appearance indicates a high volume of inclusions or a large-grained grade of stainless steel.
Micrographs: A better test of the integrity of the surface is provided by photomicrographs of the surface. Although a highly buffed (such as a No. 8 mil finish) sample and an electropolished sample may appear equally brilliant to the unaided eye, the differences between the two are apparent when they are viewed under very high magnifications. The sample micrographs below, taken at 1,000X, dramatically illustrate the smooth, featureless surface that results from electropolishing.
This photomicrograph represents the surface of 304 stainless steel with a No. 2B mill finish before Electropolishing. Note that the etched boundaries between the grains are only partially sealed, resulting in a network of sub-surface crevices. Contaminants that lodge in these crevices are protected from contact with cleaning agents leading to subsequent migration of trapped contaminants onto the cleaned surface.
This photomicrograph represents the same No. 2B surface after Electropolishing. Note that the surface is now completely featureless on a microscopic level and has the desired noncontaminating, non-particulating and non-sticking properties.
This photomicrograph represents a 304 stainless steel surface with a mechanically polished No. 4 mill finish before Electropolishing. Note the deep grooves, cavities, torn metal and other microscopic imperfections that entrap and retain contaminants.
This photomicrograph represents the same No. 4 finish after Electropolishing. The surface may still show some of the abrasiveproduced topography to the naked eye, but will now be microscopically featureless with the desired non-contaminating, non particulating and non-sticking properties.