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The SPR 1000 is a closed loop electronic pressure regulator with an integrated high performance volume booster （5000 Nl/min @ 6 bar power stage7, able to convert a variable analog or digital input signal （current, voltage, keypad, RS-232） into a proportiional pneumatic output and maintain with precision a required downstream pressure. Equipped with an 8 bit microcontroller, it can process signals and commands, carry out complex functions and easily interface with other control/monitor systems via serial RS-232, perfectly integrating in applications which had required more elaborate and expensive systems up till now. The compact and functional design, overall performances and reliability makes for an effortlrss integration in any advanced pneumatic system that requires an active component quuickly adaptable to any specific requirement. The input signal, which could be analog （0-5 V, 0-10 V, 4-20 mA） or digital （serial Rs-232, keypad/display）, is processed by the microcontroller and converted into a proportional pressure output （0-7 bar or optional 0-12 bar） by using PWM （Pulse Width Modulation） controlled high-speed solenoid valves for feed and exhaust functions. An integrated pressure sensor continuously monitors the output pressure of the SPR 1000 providing a feedback to the controller that compares this value to the desired setpoint, which is set by the input signal. Thus any variation of the output pressure can be quickly and precisely compensated in order to maintain the requested downstream pressure. This closed loop system has a reaction time of less than 5 ms. In addition, the SPR 1000 may supply an analog output in proportion to the downstrea pressure.

The SPR 100 ia available in two basic versions:

• SPR 100A Equipped with analog/digital input interface （0-5 V, 0-10 V, 4-20 mA*, RS-232） and status leds.

• SPR 100D equipped with analog/digital input interface （0-5 V, 0-10 V, 4-20 mA*, RS-232）, keypad/display user interface, status leds.

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