Selecting an Electro-Pneumatic Air Regulator
Introduction to
Electro-Pneumatic Air Regulators
Electro-Pneumatic Air Regulator Types
Input Control Signal
Output Pressure Range
Accuracy
Flow Rate
Maximum Supply Pressure
Supply Pressure Sensitivity
Supply Air
Exhaust Capacity
Air Consumption
Vibration
Zero & Span Recalibration
Introduction to
Electro-Pneumatic Air Regulators
Electro-Pneumatic Air Pressure Regulators convert an electrical input signal, such as a 0-10 VDC signal, to a proportional pressure output. The pneumatic output is both linear and proportional to the analog input command signal. The variable pneumatic output pressure is used to control valve actuators & positioners, HVAC systems, clutches & brakes, paper handling, textile processes, and many other industrial applications where precise pneumatic pressure control may be required.
Electro-Pneumatic Air Regulator Types
T3110 Electro-Pneumatic Air Regulators provide a precision pressure output, which is proportional to the user’s electrical command signal. The single closed loop controller has a pressure sensor in the manifold block, which will provide accuracy to +/- 0.50% full scale. The reliable twin solenoid valve system requires no air consumption (conserves air - no constant bleed) at steady state output pressure. The compact card design can be mounted directly to a panel or DIN rail mounted with no sensitivity to vibration, shock or mounting position.
T3210 Electro-Pneumatic Air Regulators provide a precision pressure output, which is proportional to the user’s electrical command signal. The single closed loop controller has a pressure sensor in the manifold block, which will provide accuracy to +/- 0.50% full scale. The reliable twin solenoid valve system requires no air consumption (conserves air - no constant bleed) at steady state output pressure. The CE approved design features a weatherproof housing and can be pipe mounted inline or conveniently on top of a booster relay for higher flows. The model 3210 is not sensitive to mounting orientation.
T3211 Electro-Pneumatic Air Regulators provide a precision pressure output, which is proportional to the user’s electrical command signal. A built-in air volume booster provides flows equivalent to standard industrial electronic regulators or I/P transducers. The internal pressure sensor provides closed loop accuracy to +/- 0.50% full scale. The reliable twin solenoid valve system conserves air with no constant bleed at steady state output pressure. The CE approved design features a weatherproof housing and can be panel or pipe mounted. The model 3211 is not sensitive to mounting orientation.
T3510P Digital Electro-Pneumatic Air Regulators provide high accuracy digital control of air pressure. The 3510 with local keypad programming features advanced microprocessor Proportional - Integral - Derivative (PID) control, a 4 digit display indicating output pressure, and a voltage or current analog command signal. The single closed loop controller has a pressure sensor in the manifold block, which will provide accuracy to +/- 0.50% full scale. When this unit is used with an external volume booster, a programmable external feedback option permits 0-10 VDC loop feedback from a remote sensor. The reliable twin solenoid valve system requires only minimal air consumption at steady state output pressure. The CE approved design features a weatherproof housing and can be pipe mounted inline or conveniently on top of a booster relay for higher flows. The model 3510 is not sensitive to mounting orientation.
T3511P Digital Electro-Pneumatic Air Regulators provide high accuracy digital control of air pressure. A built-in air volume booster provides flows equivalent to standard industrial electronic regulators or I/P transducers. The 3511 with local keypad programming features advanced microprocessor Proportional - Integral - Derivative (PID) control, a 4 digit display indicating output pressure, and a voltage or current analog command signal. The single closed loop controller has a pressure sensor in the manifold block, which will provide accuracy to +/- 0.50% full scale. A programmable external feedback option permits 0-10 VDC loop feedback from a remote sensor. The reliable twin solenoid valve system requires only minimal air consumption at steady state output pressure. The CE approved design features a weatherproof housing and can be panel or pipe mounted. The model 3511 is not sensitive to mounting orientation.
Input Control Signal
We offer electro-pneumatic air pressure regulators that accept either a voltage or current input control signal. 0-10 VDC and 4-20 mA signals are the most common. The input control signal is field selectable on many
electro-pneuamtic regulators.
Output Pressure Range
Many standard output pressure ranges from 0-1 PSI up to 0-300 PSI are available to meet your specific application.
Accuracy
Accuracy is a measure of the overall performance of the servo regulator and includes the following:
Linearity is the error defined by the maximum deviation of a regulator output from a best fit straight line during any one calibration cycle.
Hysteresis is the error defined by the maximum measured separation between the upscale and the downscale indications of the measured pressure during a full range traverse from 0 to the maximum pressure.
Repeatability is the error defined by the ability of the regulator to reproduce an identical signal when the same pressure is applied to it consecutively, under the same conditions and in the same direction.
Flow Rate
The maximum air flow measured in standard cubic feet per minute (SCFM) that a regulator will output for a given pressure and input signal. Flow rate is a good indication of the speed and response time of a pneumatic actuator or system.
Maximum Supply Pressure
Typically indicates the maximum allowable inlet air pressure to the regulator for safe and reliable performance.
Supply Pressure Sensitivity
The amount of output pressure change for a given change in supply pressure. Usually given as a percent of full scale span per 1 PSI change in supply.
Supply Air
The inlet air supply should be oil free, clean, dry, and filtered. For the best performance and longest life, instrument quality air should be provided to most
electro-pneumatic air regulators.
Exhaust Capacity
The exhaust capacity of a regulator is the ability to relieve downstream pressure back through the outlet port and vent of the regulator body.
Air Consumption
The amount of air used even when the regulator has zero flow out is called air consumption.
Vibration
Whenever possible, the user should try to install the regulator in an area that minimizes vibration.
Zero & Span Recalibration
Many servo regulators have an onboard zero and span adjustment for recalibration. The span adjustment typically is not used for setting the maximum range of the regulator, but for recalibration (adjustment typically limited to +/- 10%).
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