The Series 523 is a revolutionary vacuum transducer using the combination of diverse materials and two different types of discharge. It provides a low-cost, wide-range cold cathode suitable for industrial coatings, analytical instruments, and general vacuum applications. The design of the Series 523 is the right fit for applications requiring limited accuracy. It covers a wide pressure range from Atmosphere to 10-7 Torr, without the use of a conventional heat loss (Pirani) sensor, for measurement from 10-2 Torr to Atmosphere.
The Series 523 uses the historic inverted magnetron approach for measuring pressure in the typical cold cathode range from 1 x 10-7 to 1 x 10-2 Torr. Utilizing a stainless steel anode and cathode with a magnet surrounding the measurement cell, this construction provides similar performance to other inverted magnetron cold cathodes on the market. Accuracy in this range is published at ±50% of Reading.
The Series 523 cold cathode does not use the typical Pirani sensor to measure pressure above the cold cathode region, but applies the theory of Paschen’s Law. In the region from 10-2 Torr to 10 Torr, an enchanced arc discharge is created using a similar anode and cathode approach, on a smaller scale, to measure pressure. Above 10 Torr, a traditional arc discharge provides the measurement. Though the accuracy in this range is not equal to a Pirani type reading, it is adequate to control the high vacuum cold cathode and an indication of the pressure in the medium vacuum range
The innovative 523 Granville-Phillips® Wide Range Cold Cathode Vacuum Pressure Transducer provides low-cost, wide-range vacuum/pressure measurement for a wide variety of applications.
One of the key differences between the Series 523 and historic cold cathode gauges is the material used for vacuum containment and electrical feedthroughs. The Series 523 utilizes a polymer base material for both the vacuum containment and electrical feedthroughs. With the use of a polymer, typical machining constraints of traditional stainless steel construction can be removed and the use of polymer molding techniques can be used to create unique geometries. The polymer has gone through a rigorous material selection protocol taking into consideration outgassing rates, mechanical and temperature properties, and electrical properties. Though the polymer material is not intended to replace the historic metal or glass enclosures, it is very suitable for the vacuum range and applications of the Series 523.
For vacuum users requiring limited accuracy and operating within the pressure range of Atmosphere to 10-7 Torr, the Series 523 is ideal for applications requiring simple, repeatable pressure measurement.