User Manual SERVOPRO Plasma Trace N
2
Analyzer
5.0 DESCRIPTION
13
The resulting light is directed to a special photodiode, where an electrical current is generated.
This current is proportional to the nitrogen level in the argon stream.
By regulating the power of the plasma and having close control of plasma position with the
focusing electrodes; we can optimize the sensitivity for a particular spectral ray.
5.5 Electronics
The current from the photodiode is directed to a low bias current switched integrator, followed by
a precision floating-point programmable gain amplifier, and ending with an analog to digital
converter. This data is read by the microprocessor circuit, where a digital signal processing
algorithm is executed to determine the equivalent parts per million value.
The microprocessor board converts this value back into an analog one; then an optional
4-20 mA isolator transmits it to a remote PLC, computer or recorder.
The microprocessor board also manages operator interventions and validates data input from the
keypad. The data is displayed on a LCD of 4 lines x 40 characters. Also, the microprocessor
board controls flow with a P.I.D. algorithm.
The microprocessor board uses a multitasking kernel to control the operation of the analyzer.
On option, the analyzer may be equipped with digital output, for remote range indication. Also, a
serial port may be installed with the appropriate protocol for remote data transmission.
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