THE INSIDE STORY OF THE QBT: Access hole allows adjustments in the field. Easy tuning of Zero & Span calibration potentiometers Available in a wide range of electrical control input and analog output • Precision pressure control 2nd loop input, QB2T valves only Auxiliary connector (S305 option) • Non-air consuming in steady IP65 enclosure allows it to withstand the elements and be washed down without harm state which reduces cost of manufacturing • Ships with required filtration • Unaffected by shock or vibration • Unaffected by supply pressure change DIMENSIONS QBT DIMENSIONS ARE FOR REFERENCE...

THE INSIDE STORY OF THE QBS: • Precision pressure control Available in a wide range of electrical control input and analog output Internal stainless steel pressure sensor, that utilizes dry technology instead of liquid fill, is used for increased reliability and media compataiblity QBS available in anodized aluminum or stainless steel manifold which enhances media compatibility • Two outlet ports which allows flexibility in mounting options. • Ships with required filtration Access hole allows adjustments in the field. Easy tuning of Zero & Span calibration potentiometers 2nd loop input, QB2S...

FUNCTIONAL DESCRIPTION The QB Series uses Proportion-Air’s patented The QB2 is similar to the QB1 but uses a double loop technology for closed loop control. The QB Series control scheme. In addition to the internal pressure trans- valves can be built in either a single loop or double ducer, the QB2 also receives a feedback signal from an loop control scheme. external sensing device. The external signal functions as The QBT Series is used to control pressure of inert the primary feedback signal which is compared against gases from full vacuum up to 300 psig (21 bar). the command signal input....

QB GENERAL SPECIFICATIONS & PERFORMANCE CHARACTERISTICS ELECTRICAL Supply Voltage Supply Current Command Signal Voltage Current Analog Monitor Output Voltage Current Command Signal Impedance Voltage Current Inlet Pressure (1) Pressure Range (2) Flow Rate(3) Cv Capacity Filtration Required Accuracy QBT QBS Hysteresis QBT QBS Repeatability QBT QBS Port Size (all) Critical Volume Wetted Parts QBT QBSA QBSS Full Vacuum 110% of full scale calibration Full Vacuum 1.2 SCFM (34 l/min)@ 100 psig (6.89 bar) 0.04 40 micron (actual) 20 micron Fluorocarbon, Brass, Nickle Plated Brass , Silicon, Aluminum Anodized...

PERFORMANCE CHARACTERISTICS RESPONSE TO STEP INPUT Command [Volts] Times for QB to fill/exhaust a closed chamber. Step command signal is superimposed over pressure trace. Time is determined by the difference between command signal and pressure achieved. FLOW CHARACTERISTICS INLET PRESSURE RATING Secondary Pressure psig (bar) This chart shows the linear characteristics of QB products when given a ramp signal from 0-10 volts. Characteristics would be similar for 4-20 mA units. QB1TFEE100 Primary Pressure = 100 psig (6.9 bar) For QB valve that is ordered with Maximum inlet maximum calibrated pressure...

ORDERING INFORMATION SERIES DIGITAL DISPLAY* 1 = Single Loop 2 = Double Loop D = Digital display BLANK = No display MANIFOLD MATERIAL** MONITOR SIGNAL QBT Series Manifold Option Blank = Brass manifold QBS Series Manifold Options A = 6061 Aluminum S = 303 Stainless T = Standard Sensor for pressure up to 300 psig (21 bar) S = Stainless Steel Sensor for higher pressure up to 500 psig (34 bar) MAXIMUM CALIBRATED RANGE Vacuum –500psig*** SPECIAL OPTIONS Blank = No option S133 = Vacuum through positive pressure calibration S305 = Aux. Receptacle for 2nd loop input (QB2 units only) S972 = Calibrate...

ACCESSORIES DIMENSIONS ARE FOR REFERENCE USE ONLY QBT-01 Bracket