An Easy Way to Performance Test Mass Flow Controllers
In their most elemental form, mass flow controllers are closed loop systems, consisting of a sensor, conditioning electronics and proportional control valve. Flow changes measured by the sensor are interpreted and compared by the electronics to a desired control valve position. Any deviation in the measured flow from the desired flow will result in a movement of the control valve to its desired position.
Many things can and will effect a mass flow controller's performance.
The most efficient way to uncover these fundamental problems when the performance of a mass flow controller becomes unreliable, is to test it in series with a mass flow meter downstream of the mass flow controller. A battery powered Alicat mass flow meter with its own integral display will work best in this application.
Once the mass flow meter is securely connected to the downstream side of the mass flow controller and using a clean surrogate gas like nitrogen, program the mass flow controller through a multiple number of flow set point conditions. Compare the anticipated flow conditions to those actually measured by the mass flow meter. Any deviation is a good indication that the mass flow controller will need to be serviced.
Alicat Scientific offers battery powered mass flow meters in a full range of flow sizes. Each includes a stored library of dozens of pure gases and gas blends, a high contrast backlit LCD display and the features needed to help you properly understand the performance of your mass flow controllers. Contact us for full technical details.
How Accurate Are My Vacuum Gauges?
We know that vacuum processes can and do drift over time. When that happens, our scrap rates increase and the bottom line shrinks.
As vacuum gauges age or become contaminated, measurement inaccuracy creeps into the process envelope, until we're no longer operating within the tolerances of the process. The result is scrap, not salable product.
The obvious point is to know when to service or replace vacuum gauges that are no longer dependable.
The solution is to have a Certified Master Gauge whose sole purpose is to have its reading compared to that of the 'working' gauge installed in the process equipment.
Thyracont offers many models of self-contained vacuum measurement instruments that are proving their worth in hundreds of unique applications around the world. These instruments feature bright LCD displays, are easy to use and delivered in rugged foam-lined carry cases with everything needed to be Certified Master Gauges.
Certified Master Gauges are available in the following instruments:
VD81 - Handheld Vacuum Meter / Data Logger - Range:1200 Torr to 1 Torr
VD85 - Handheld Vacuum Meter / Data Logger - Range: 900 Torr to 0.5 MilliTorr
VSR Transducer - Range: 900 Torr to 0.5 MilliTorr
VSM Transducer - Range: 760 Torr to 5 x 10-9 Torr
All Thyracont Instruments carry a Two Year Warranty and are CE Marked.