The QL3 allows high volumes of air to move quickly and precisely at pressures up to 150 psig using proportional solenoid valves with a unique analog PID circuit. Ideal for use with flow meters, it provides high resolution and smooth pressure control at high and low flow rates and avoids the “steps” prevalent in most feed and bleed I/P’s. The output pressure is proportional to the electrical input or command signal. The QL3 improves and builds on the proven Proportion-Air QB3 series’ high performance using a current driven variable orifice solenoid valve and the analog PID circuit. The PID circuit integrates error out quickly resulting in superior resolution. This combination of the “stepless” solenoid valve with a high speed analog PID on a high flow volume booster is what allows large volumes of air to be moved with precision at a very high flow rate. The QL3 is also easily serviced. The volume booster is designed so there are no stamped gaskets or special molded diaphragms or seal parts. All of the parts related to normal maintenance are standard o-rings. Complete repair kits are available, but in case emergency repair is needed parts should be available from any fluid power distributor or even most neighborhood hardware stores. • UPPLY VOLTAGE....................….15-24 VDC • SUPPLY CURRENT...................….250mA max. • COMMAND SIGNAL • VOLTAGE..................…..0-10 VDC • CURRENT..............…….4-20mA differential • COMMAND SIGNAL IMPEDANCE • VOLTAGE..................…..4.7 K? • CURRENT..................….100 ? • ANALOG MONITOR SIGNAL • VOLTAGE...............…….0-10 VDC @ 10mA max • CURRENT……………….4-20mA Sinking or Sourcing • MECHANICAL • PRESSURE RANGES¹...............0 to 5 psig through 0-150 psig • OUTPUT PRESSURE¹................0-100% of range • FLOW RATE • FORWARD & EXHAUST .............25 SCFM max @ 120 psig inlet & • 100 psig outlet • (708L/min @ 8.27 BAR inlet & 6.89 • Bar outlet) • MIN. CLOSED END VOLUME.…..5 in³ • FILTRATION RECOMMENDED…40 micron actual • LINEARITY………………...........…<±0.3% F.S. BFSL ² • HYSTERESIS……………………….0.05% F.S. • ACCURACY ..............................……<±0.4% F.S. ² • RESOLUTION………………………0.05% F.S. • WETTED PARTS‡ .................Elastomers - Buna N (3) • Manifold - Aluminum Nickel Plated • Valves - 430FR SS, 360 Brass o Seal material: Viton & Buna-N • P.Transducer - Utem 1000, Aluminum, • PHYSICAL • OPERATING TEMPERATURE....32-158ºF [0-70ºC] • DIMENSIONS…………………….2in.X2 in.X4.4 IN • (51mmX51mmX111mm) • WEIGHT.................................…....1.06 lb [0.50 Kg] • PROTECTION RATING...........…NEMA 4 / IP65 • HOUSING...............................……Aluminum (Anodized) • VOLUME BOOSTER.....................Electroless Nickel Plate • ¹ Pressure ranges are customer specified. Custom pressure ranges are avail- • able. Any range 5 to 150. • ² Dependent on response adjustments. Valve can be field adjusted for best • response for the actual application • ³ Other elastomers are available. Consult factory.
