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The Series A4 digital differential pressure controller is a patent pending microprocessor based pressure controller for positive, negative, and differential pressure as well as velocity and flow. The Series A4 differential pressure controller includes (2) 8A SPDT relays, and an optional digitally scalable 4-20 mA output. The programmable control allows full configuration of variables such as setpoints, dead band, engineering units, flow coefficients, and more. The programming is done from a user-friendly menu on the OLED display or with an Opti Link™ programming key. The OLED also displays the exact setpoints or other user defined variables during normal operation. Furthermore, the menu structure can be customized by moving variables to different menu levels to accommodate user preferences. Compared to other mechanical products, the Series A4 digital differential pressure controller has a significantly reduced depth, an improved look, and better performance. Techinical Specification Maximum Pressure: Ranges -00 to -05 = 2 PSI (13.8 kPa) Ranges -06 to -14 = 10 PSI (68.9 kPa)Media Compatibility: Air and compatible non-combustible, non-corrosive gassesAccuracy: 1.0%, 0.5% or 0.25%Temperature Ranges: Compensated and Operating: -10° to 140°F (-23° to 60°C)Thermal Effect: +/- 0.02% FS/°FOutput Signal: 4-20 mA (option)Loop Resistance: 750 Ω Max (for internally sourced power); 1800 Ω Max (for externally sourced power of 36 VDCPower Supply: Universal 24-240 VAC or VDCHousing Material: Glass Filled NylonEnclosure Rating: Designed to meet NEMA 4X (IP 65) face; with optional cover the entire product is weatherproofRelays: (2) SPDT 8 Amps @ 250 VAC, 5A @30 VDCElectrical Connections: screw terminalsResponse Time: Display: 4 Digit, red LED, ½” (12.7 mm) digits; OLED programming displayProcess Connections: Push on connection for 3/16” (5 mm) tubingAgency Approvals: ETL, CE
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