All units come with a 4 ½” magnehelic meter for pressure readout—optional digital display must be ordered at the time of purchase.   A range must be specified on your purchase order when ordering a MicroAir I, MicroAir II and MicroAir IV single channel model.  On all Dual, 3-channel and 4-channel MultiAir units a range must be specified for each channel.

MicroAir ranges available are: 

• 0 – 3 inches of water
• 0 – 5 inches of water   
• 0 – 10 inches of water
• 0 – 15 inches of water
• 0 – 30 inches of water
• 0 – 50 inches of water
• 0 – 80 inches of water
• 0 – 3 psi *
• 0 – 5 psi * or 0 – 150” of water (Maximum range)
• Other ranges available upon request.  We can also do lower ranges such as: 0-1″ of water and 0-2″ of water.

Available also in:

• millibar (0-8 mbar, 0-40 mbar, 0-75 mbar, 0-150 mbar, 0-200 mbar, 0 – 300 mbar maximum)
• Killipascal (0-1.25 kPa, 0 – 3 kPa, 0-8 kPa, 0-20 kPa, 0 – 35 kPa max)
• Ounces per square inch (0-80 oz per sq in)
• Millimeters of water column (0-125 mm w.c.)
• Centimeters of water column (0-350 cm w.c.)

*If ordering unit with a digital display option, please note the display reads in “inches of water”, kpa or mbar.

How to help you choose a range:

• Your target operating internal air pressure should be in the middle of the range/meter. Note operating a unit below 10% of full scale will lose some precision.
• One psi = 27.68” of water
• There are too many variables on a tubing line including what type of plastic, material, line speed, etc. for us to pick a range for you. High ranges like 0-3 psi and 0-5 psi are used most often making automotive tubing while the lower ranges of  0-15” of water and 0-30” of water are the most popular for medical tubing.  The newer micro-tubes can use ranges as low as 0-5″ of water, and 0-3″ of water.
• All MicroAir I and MicroAir II units can be easily range changed free within 30 days of purchase or with a kit purchased from OLC.                     
• The MicroAir IV unit can be ranged change if needed at our factory for a fee.

*Digital Display are accurate to +/-.1% of full scale below 60” of water (.01” of water) and +/-.3% of full scale above 3 psi (.03 psi). One decimal place (00.1) on units with a maximum range above 10” of water. Two decimal places (0.01) are available below 10” of water range.

“Let the tube talk to you. Less is best” – Bob Bessemer of Novatec

All MicroAir units do not ever need to be calibrated as the unit is factory set before shipping.