Phone: 978-562-5353
Fax: 978-562-8986
olc@onlinecontrols.com

MicroAir series of Ultra Low Pressure Air Regulators

and Controllers for Manufacturers of Extruded Tubing.

The MicroAir provides precise control of tubing outside diameter by regulating air pressure to a set point during the manufacture and extrusion of medical, catheter and automotive tubing. MicroAirs are used to regulate and control pressure for precise air sizing of extruded plastic tubing. Pressure is maintained for widely varying flow rates such as when a cut is made, etc. The "force balance regulator" provides instantaneous response to changes in flow rate and maintains a set pressure with flow rates from near zero up to the rated maximum. Both our low-tension spring models and our high speed linear solid-state model offer some of the highest flow rates in the industry.

• MicroAir I - manual model
• MicroAir II - Up/Down buttons and accepts contact closures
• MicroAir IV - High speed switching for bump and taper tubing
ULTRA LOW RANGES: 0-2" of water, 0-5" of water, 0-15" of water, 0-30" of water, 0-50" of water,

0 - 3 psi, and 0 - 5 psi.
Our 0 - 2" of water full scale unit can effectively regulate down to .2" of water (0.01 psi).
Lower ranges (0.25", 0-.5" and 1") are possible in our MicroAir I and II.
Maximum full range is 5 psi. (Note: 1 psi = 27.68" of water)

Each MicroAir includes a Dwyer Instruments, Inc., magnehelic pressure gauge accurate to 2% of full scale.
Meters available in inches of water, pounds per square inch (psi), mbar, kPa, etc.
A fluid filled chamber mounted below the pressure relief valve adds viscostatic damping to ensure stable, hysteresis free operation.
(Note: oil does not come in contact with the regulated air)
Repeatability is better than 1% of full scale. Full scale is the maximum air pressure output ordered.
Single channel MicroAir I, MicroAir II and MicroAir IV units are built in stainless steel enclosures 12" x 10" x 6".
Multi-channel units for multi-lumen tubing are available in all models (see below).

A 3-year Factory Warranty is offered on all units. Our highly-reliable MicroAirs have a life-expectancy of 10-20 years.
All units are manufactured in the United States of America at our Hudson, Massachusetts facility.

Download file: MicroAir Catalog Sheet
Download file: MA 2012 Specification Sheet
---
MicroAir I Ultra Low Pressure Air Regulator (MAI)

MicroAir I
Pressure Control: The set point may be adjusted manually on a MicroAir I. When connected to standard factory air supply, the MicroAir's regulator balances the output pressure against a low-tension spring and expels surplus air to the atmosphere. This "force balance regulator" provides nearly instantaneous response to changes in flow rate and maintains a set pressure with flow rates from near zero up to the rated maximum. Manual model controlled by a single 30 turn adjustment knob.
Air Input: The air inlet is connected to normal factory air which has been regulated down to approximately 45 psi.
     
---
MicroAir II Ultra Low Air Pressure Regulator and Controller (MAII)

MicroAir II
Pressure Regulation and Control: The MicroAir II accepts Air Up and Air Down contact closure inputs from a Diameter Gauge, or other controllers with up/down contact closures or logic outputs. Pressure is regulated by balancing against a low tension spring and by venting the surplus air. Two front panel buttons for manual control and the externally controlled inputs for auto control adjust the pressure set point by means of a small motor which adjusts the spring tension. Indicators show Up, Down, and Limit conditions. Zero to Full Scale in approximately 2 minutes.
Air Input: The air inlet is connected to normal factory air which has been regulated down to approximately 45 psi.
Power: 115/220 VAC power. 50/60 Hz
Options:
• Digital LED pressure readout with 0.1 inch of water resolution.
  
  For closed-loop control select a voltage or current output. Output option boards include an independant pressure sensor.
• Voltage pressure output - Can be 1-6 VDC (with 1 volt = 0 psi out; 6 volt = full scale psi out); 0-5 VDC or 0-10 VDC
• Current output - 4-20 ma output, 500 ohm max load (4 ma out = 0 psi out; 20 ma out = full scale psi out)
• Remote control unit with 100 foot cable.(See picture below)
• Modbus
---

MicroAir IV
MicroAir IV Ultra Low Pressure Air Controller for Manufacturers of Bump and Tapered tubing.(MAIV)
Application: The MicroAir IV is specifically designed for the manufacturers of bump tubing where the pressure must be switched quickly or varied in a controlled way. The MicroAir IV accepts a logic input to select one of two set points, and a zero to 10 VDC analog input to provide any pressure from near zero to full scale instantaneously.
Operation: The MicroAir IV is connected to normal factory air within the range of 50 to 120 psi. It then regulates to the pressure set by a 0 to 10 volt input, or to one of the two manually set pressures by expelling surplus air. A precision voice-coil linear motor (no spring) with viscostatic dampling ensures optimum speed and stability.
Operational Modes: In Dual-state mode a logic signal selects which of two pressure set points is active. The Hi and Lo set points are adjusted with front panel buttons. In Linear mode a zero to 10 volt input controls pressure and the adjustable set points are ignored. A manual pressure setting can be set by turning the left side potentiometer only.
Performance: The MicroAir IV responds to a step of 50% of full scale in less than 0.1 second (typically 20 msec) and maintains an accurate pressure at flow rates between zero and a maximum SCFH depending on the full scale range.
Power: 115/220VAC. 50/60 Hz

Options:
• Digital LED pressure readout with 0.1 inch of water resolution.
  
  For closed-loop control select a voltage or current output. Output option boards include an independant pressure sensor.
• Voltage pressure output - Can be 1-6 VDC; 0-5 VDC; or 0-10 VDC
• Current output - 4-20 ma
• Modbus



• Contact Closure - to add the benefit of UP/Down contact closure inputs to emulate a MicroAir II.
  Making the MicroAir IV an all-in-one-unit.

---
MultiAir - Multiple Channel MicroAir Units
For Multilumen applications the MicroAir units are offered with up to four channels in a single stainless steel enclosure with one air inlet.
Air Input: The air inlet is connected to normal factory air which has been regulated down to the 50 - 60 psi range.
Models available:
• Dual MicroAir I "DMAI" (16" x 10" x 6")
• Dual MicroAir II "DMAII" (16" x 10" x 6")
• Dual MicroAir IV "DMAIV" (15" x 10" x 6")



• MultiAir 3-channel MicroAir I "MU3MAI" (20" x 10" x 6")
• MultiAir 3-channel MicroAir II "MU3MAII" ("23 x 12" x 6")
• MultiAir 3-channel MicroAir IV "MU3MAIV" (22" x 10" x 6")
• MultiAir 4-channel MicroAir IV "MU4MAIV" (28" x 10" x 6")

SALES
Our MicroAir units are:
• SOLD factory direct from our Hudson Massachusetts plant
  Email: olc@onlinecontrols.com or call 978-562-5353
• 
  and with your new extrusion line from (OEM) manufacturers such as:


• American Kuhne americankuhne.com


• Davis-Standard Corporation davis-standard.com


• RDN Manufacturing Company rdnmfg.com


• in China our representative is
  Global Trade Management www.e-gtm.com.cn
On Line Controls prides itself on being dedicated to applying our knowledge and resources to understand, support and meet our customer needs. Our products are delivered throughout the United States and internationally.

    For pdf download click: (MAS) MultiAir Sheet or MicroAir Description and Mounting
---
Our newest innovations include:

Remote control unit for MicroAir II. A small (8"x5"x2") box with standard 100 foot cable, with up/down control buttons and digital display. Remote connects to 4-20 ma output option in MicroAir II.
Newer Features can now be added to older MicroAir units include digital display, remote push buttons, let us know what you need. Range change kits are available for the MicroAir I and MicroAir II. The MicroAir IV can be range changed if need at our factory only.
MODBUS is in testing. Please let us know you are interested in it and a engineer will contact you.