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Dual Split-Second Sizer Support

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Select from any of the topics to the left or view the troubleshooting recommendations below to get started. From replacement parts to directions on how to receive factory repair, it’s all here!


Instruction Sheet
with Size Settings


Charts for your inflator:
Balloon Size Setting Charts

Size Setting Chart

The following settings should be used as guidelines for the Dual Split-Second Sizer. Please note that size settings will vary based on user preference, balloon color, manufacturer and from unit to unit. To adjust the size of balloon to your individual preference it is necessary to inflate test balloons.

Balloon Size Helium Nitrogen Air Compressor
1 Outlet 2 Outlets 1 Outlet 2 Outlets 1 Outlet 2 Outlets
5″  N/A  N/A  0.2 Sec 0.3 Sec 0.3 Sec 0.4 Sec
 N/A  N/A  70 PSI  70 PSI  70 PSI  70 PSI
 9″  0.5 Sec 0.6 Sec 1.4 Sec 1.6 Sec 1.7 Sec  2.5 Sec
 70 PSI  70 PSI  70 PSI  70 PSI  70 PSI  70 PSI
11″  0.9 Sec 1.0 Sec 2.5 Sec 2.9 Sec 3.0 Sec 4.6 Sec
 70 PSI  70 PSI  70 PSI  70 PSI  70 PSI  70 PSI
 16″  2.8 Sec  3.2 Sec 7.7 Sec 8.3 Sec  N/A  N/A
 70 PSI  70 PSI  70 PSI  70 PSI  N/A  N/A

PSI SETTINGS refer to the gauge located on adjustable regulator at the back of Dual Split-Second Sizer. This controls the speed of the inflation cycle.
SECONDS SETTINGS refers to the tenth of a second increment readouts on digital display(s) on Dual Split-Second Sizer.
Important: To ensure consistent balloon sizing when using helium or nitrogen, it is necessary to check the size of the balloons every 1/3 of a cylinder of gas. If necessary, increase the size of the balloon by either increasing the size setting or the inlet pressure.

60/40 Helium/Air Outlet Settings

The following settings should be used as guidelines for the using the optional 60/40 Helium/Air Outlet with the Dual Split-Second Sizer. The 60/40 Helium/Air Outlet is recommended for use with 16” or larger balloons

Setting with 60/40 Outlet:
1 Outlet
Setting with 60/40 Outlet:
2 Outlets
 11″ 1.4 1.7
11″ w/ Ultra Hi-Float® 1.4 1.7
16″ 4.2 4.5
24″ Inflated to 21″ 9.5 N/A
3ft Inflated to 30″ 23 N/A

Double Bubble Balloon Size Chart

 Inside Balloon: 11″ Outside Balloon: 16″
70 PSI
Left Outlet, Blue Hose,
Dual Sizer Setting: 1.1 Seconds
70 PSI
Right Outlet, Yellow Hose,
Dual Sizer Setting: 2.5 Seconds
General troubleshooting recommendations for your inflator:
Doesn't size both balloons to the same size

If the Dual Sizer doesn’t size accurately on both sides confirm the following:

Confirm your finger placement on the outlet when inflating balloons. Be sure your fingertips are no where near the opening of the outlet otherwise the balloons will not inflate to the same size. Refer to the image below to confirm your fingers are at the right placement.

WITH Extension Tips


WITHOUT Extension Tips


Digital Models

• You are inflating the same type of balloons, (metallic balloons, Jewel Tone balloons and Standard Color balloons all inflate differently). Mixing balloon color types will appear to create inconsistent sizing due to the varying shape of the balloons.

• The Dual Sizer is set to mode 3. The digital timer should look similar to the picture below.

• Examine the Extension Tips. If there are any cracks or dents, the Extension Tips will need to be replaced. See the Replacement Parts Tab to the left, for Replacement Extension Tips.

• Identify which side is not inflating correctly and try switching the outlets. If the problem switches to the other side, the outlets needs to be replaced. See the Replacement Parts Tab to the left, for Replacement Outlets.

If the problem persists, try preforming a 7-Point Tune-Up. See the How to Preform a 7-Point Tune-Up tab below.

Non-Digital Models
• Confirm you are using the same size outlets on both sides.

• When inflating 9″ and larger balloons, adjust the size setting every 1/3 of a cylinder. This assures that the size of balloons is consistent as the cylinder pressure decreases.

If the problem persists, Contact Conwin Support.

Not inflating to the same size from a full to empty cylinder

As the PSI in the cylinder drops, so will the PSI entering your inflator. The 2nd Stage Regulator (the pressure gauge and black knob on back of inflator) regulates the PSI entering your inflator.

We recommend to adjust the 2nd Stage Regulator every third of the cylinder.

To adjust the 2nd stage regulator, unlock the black knob by pulling up. Turn the knob clockwise to increase the pressure and increase the speed of inflation. Turn the knob counter clockwise to decrease the pressure and speed of the inflator. Press the knob down to lock in place. View the instruction sheet (above) for recommended PSI settings.

Push valve sticks or leaks

It is possible that Hi-Float is in the outlet and the outlet will need to be replaced. If the inflator has not been used with Hi-Float or was exposed to moisture, we recommend spraying silicone lubricant into the push valve. Silicone lubricant spray can be found at most major hardware stores. Note: DO NOT use oil based spray like WD-40. See the Replacement Parts tab on the left for a replacement outlet.

Primary Regulator leaks

Conduct a leak-check test to confirm the exact location of the leak. See the “How to perform a leak-check test” tab below for instructions.

If the Primary Regulator leaks at the cylinder connection, close the cylinder valve, bleed the pressure out of the regulator, and firmly tighten the cylinder connection. Repeat the leak test.

If the Primary Regulator continues to leak, remove the regulator from the cylinder and try it on another cylinder. Repeat the leak-check test. If the regulator does not leak on the new cylinder, we recommend returning the original helium cylinder to the supplier for credit. (In some cases, the cylinder valve will have bad threads that cause the inflator to leak.) If it is not the cylinder valve, replace the O-ring for the cylinder connection.

If the Primary Regulator leaks somewhere other than the cylinder connection, return the regulator for service.

Pressure gauge concerns

If the pressure gauge goes up and down every time a balloon is inflated, this is an indication that the cylinder valve is not fully open. Make sure that the valve is open completely to correct the problem.

If the pressure reading on the gauge is inaccurate, it is more than likely that the inflator has been dropped or bumped during transit. The gauge cannot be re-calibrated and must be replaced. See the Replacement Parts tab on the left for a replacement outlet.

Foil balloon inflation is too slow

If the Auto-Fill Foil Outlet seems to operate slowly, hold the top of the foil up while inflating. If the internal valve on the foil balloon is folded over, the flow will be restricted and inflation will be very slow.

Please note that Conwin’s Auto-Fill Foil Outlets are designed to inflate foil balloons at a slower flow rate than latex balloons to insure that the foil valve is not damaged during the inflation process.

How to perform a 7-Point Tune-Up

To keep the outlets lubricated and ready for use, we recommend you preform a 7-Point Tune-Up on your Dual Sizer at least once a year.

Step 1. Set your inflator to 9.0 seconds at 90 PSI. Tap the foot pedal or press the inflation button 3 times to cycle the unit. This will blow out any foreign particles that may have entered the system.

Step 2. Remove the filling outlets and gas supply line from the unit.

Step 3. Spray silicone lubricant into gas supply port (located in the back of the unit) and into the latex inflating port(s) on the top of the unit. IMPORTANT: Only use spray silicone lubricant. Do NOT lubricate the unit with an oil-based lubricant. Spray silicone lubricant is available at your local hardware or automotive store.

Step 4. Tilt the inflator to the right and hold for a few seconds. Then, tilt the inflator to the left and hold for a few seconds. This will allow the silicone lubricant to fully enter the unit.

Step 5. Attach the gas supply line and pressure the unit. Do not attach filling outlets.

Step 6. Set your unit to 0.3 seconds at 80 PSI. Cover the inflating ports on the top of the unit with a rag and tap the foot pedal or press the inflation button 10 times to fully lubricate the unit.

Step 7. Before using your inflator, it is important to blow out all excess lubricant. Place a clean paper towel over the outlets and tap the foot pedal or press the inflation button to cycle the unit. If the paper towel shows any lubricant, it is necessary to continue cycling the unit. When the towel shows no signs of lubricant, replace filling outlets. Now your inflator is ready for use!

How to perform a leak-check test

Use a spray bottle filled with soapy water and spray around the area where you suspect the leak is located. If large bubbles appear in one area, then you may have a leak. Be sure to thoroughly clean your inflator immediately after testing to avoid water damage.

When using an air compressor

Most air compressors are factory set to automatically cycle on at 90 PSI and automatically cycle off at 120 PSI. Conwin’s automatic sizers must have a steady supply of air or gas to produce equal sized balloons. For accurate sizing, it is essential to work within the limits of the cubic-foot-per-minute capacity of the air compressor.

Air Compressor Required Specifications:
• Primary Moisture Filter
• 20-Gallon Storage Tank
• Cycle Pressure: 90 PSI on – 120 PSI off
• Compressed Air Availability: 6.5 cubic feet/minute at 90 PSI

Important Guidelines When Using an Air Compressor:
• Compressor must build up tank pressure before inflating balloons.
• The output setting on the air compressor should not exceed 80 PSI. If the compressor is set higher than 80 PSI, the automatic sizer will outperform the compressor’s storage tank capacity.
• After each job, blow down the compressor to remove water collected in the tank during compression. The Dual Split-Second Sizer will require factory rework and re-calibration if moisture enters its system.
• Power surges will affect the accuracy of the Dual Split-Second Sizer – line voltage must be steady.

Air Compressor Hook-Up Instructions
1. Verify the air compressor has a primary dirt and moisture filter prior to attaching the hose. See Conwin’s Air Compressor Hook-Up Hose. Attach the quick disconnect socket to the air compressor. Plug-in the air line into the socket on the compressor and into the back of the inflator.

2. The colored beads inside Conwin’s Air Compressor Hook-Up Hose’s filter will change from blue to red if moisture is present in the line. If this occurs, the filter needs to be changed. Click here for replacement filters.

Can’t find the answer you are looking for?

This video shows you how to properly use the Dual Split Second Inflator.