ELECTRICAL

POWER REQUIREMENT  _____24 VDC (+/- 0.2 VDC)

SUPPLY CURRENT _______________________275mA                                                                            

MECHANICAL

MAXIMUM INLET PRESSURE  ___________130 PSIG

RESPONSE TIME _________________________ <30 ms

SHOCK RATING __________________ 25 G’s of Force

END CONNECTIONS (PORT SIZE) ________3/4” NPT

Cv___________________________________________6

WETTED MATERIALS ________Buna-N, Anodized  Aluminum, Nickel Plated Aluminum, Stainless Steel

MIZAIR®

Installation and Maintenance

U.S.  Patent #7,517,199

(Additional Patents Pending)

DESCRIPTION

SPECIFICATIONS

The Proportion-Air, Inc. MizAir® is a revolutionary new device that is specifically designed to reduce air consumption of Air Operated Double Diaphragm (AODD) Pumps.  It’s unique air delivery management allows for the reduction of air consumption by up to 50% with minimal loss of fluid flow.  The only requirements from the user of the MizAir is a 24VDC power source and to ensure the MizAir is close coupled to the pump.

    The MizAir utilizes a microcontroller controlled air dispensing system.  The MizAir consists of a high-flow normally-open two-way valve and an electronic control unit.  The high-flow normally-open valve delivers precisely timed pulses of air to the pump at the beginning of each pump stroke.  The MizAir valve then closes before the pump finishes it’s stroke.  The air that has already entered the pump and has started the pump stroke is left to continue expanding and finish the stroke.  

PHYSICAL

MEDIA WORKING

TEMPERATURE  _________________32-122ºF (0-50ºC)

AMBIENT TEMPERATURE ________32-158ºF (0-70ºC)

WEIGHT_________________________ 2.7 lbs (1.13 Kg)

HOUSING RATING _________________NEMA4x/IP65

             This results in the pump ending it’s stroke with less air entering the pump for a given amount of fluid being pumped.  Since less air enters, there is less air to exhaust as well.  This helps the pump start it’s next cycle because there is less resistance to the return stroke.  Less exhaust also produces lower exhaust noise levels.

    The MizAir utilizes an internal pressure sensor to monitor the air being supplied to the pump.  The characteristics of this pressure signal allow the MizAir’s microcontroller to determine where the pump is in its stroke.  This information is used to time the pulses of air entering the pump.  The MizAir is an intelligent device and is able to continuously monitor the speed and operating parameters of the pump and make adjustments to the valve timing as needed

    The valve is designed and built by Proportion-Air, Inc. to meet the demanding requirements of diaphragm pump control.  The MizAir has a fast response time (<30ms), low power consumption (<275mA @ 24Vdc) and high cycle life (more than 25 million cycles).  The result is a lightweight, compact, anodized aluminum two-way valve which is mounted directly to our control circuit in a NEMA 4X  rated assembly which is ideally suited to the kinds of environments in which diaphragm pumps are often installed.

INSTALLATION

Mounting

1. Mount the MizAir as close as possible to the supply air port of the pump. A quality galvanized steel or stainless steel pipe nipple is recommended.  The longer the distance from the pump to the MizAir, the less savings are possible.  A 3/4” NPT pipe nipple 6” long would be typical.

2. The outlet/work port (labeled “O” on MizAir) is connected to the supply air port of the pump.

3. Connect supply air (up to 130 psig ) to the Inlet/Supply port (labeled “I” on the MizAir).  This line should be flexible and mounted so as to avoid strain on the MizAir.  This supply line must be sized to avoid starving the MizAir and pump.  For pumps with 3/4” NPT inlet ports, use 3/4” NPT pipe and pipe fittings and/or 1” hose sizes.

4. A gauge may be installed in either of the two 1/8” NPT gauge ports of the MizAir.   This will aid in observing the   MizAir operation and troubleshooting.  The gauge must have  a range equal to or larger than the maximum supply pressure to the MizAir.  A glycerin filled gauge is recommended.

5. If a pressure reducing regulator is used in the supply air line to the MizAir, the regulator will need to be mounted as far upstream from the MizAir as allowable by the installation.  Pressure reducing regulators do not respond well to the rapid cyclical changes in air flow.  Pressure lead/lag and harmonics can cause the MizAir to see erroneous air pressure signals, preventing the MizAir from operating properly.  Twenty feet or more upstream is a typical range.

6. Other restrictions in the air supply should also be minimized.  Maximum reductions will be achieved by MizAir when unrestricted air flow is supplied.  Small piping, filters or partially open ball valves can all restrict the flow enough to prevent MizAir from providing the critical, high-volume, initial thrust to start the diaphragm pump’s stroke.

Electrical Connections Required

1. The MIZAIR requires 24 VDC power at 275mA to operate.

2. Locate the six pin G-Series Hirschmann Connector shown in Figure 1.  A field wireable mating connector (H615) is included with each MIZAIR.  The color code refers to Proportion-Air pre-assembled cables (QBT-C-x).

3. Connect 24 VDC positive to pin #6 and DC Common to pin #1 (refer to Figure 2).

Electrical Connections Optional

1. Pin #2 (blue) may be used for monitoring or data collection purposes (refer to figures 3 & 4).  During typical operation, time “t” will vary between 200mS and 800mS of duration.  The time at 24VDC represents the time the MizAir is flowing air to the pump.  Since air is added once per stroke, this signal represents one pump stroke and can be used as a pump stroke counter.

2. Pin #4 (white) may be used to monitor the pressure between the MizAir and the pump (refer to figure 5).  This is the same pressure as is displayed on the gauge shown on the dimension drawing (last page).  This signal is analog 0 to 4.1VDC = 0 to 150PSIG.  This signal is the output of an operational amplifier.  Load resistance should be greater than 1500 Ohms.

3. Pin #4 (white) may be used to cause the MizAir to shut the air supply off to the pump (refer to figure 6).  Applying 24VDC to pin 4 will shut off air to the pump.  Allowing pin 2 to float (no connection) allows the MizAir to work normally.

Figure 1

6 Pin Hirschmann Connector

FIGURE 6

MizAir

Pin 4 (white)

User Switch

24VDC

Pin #1 (green) DC Common

10K

FIGURE 4

FIGURE 5

FIGURES 3-6

(Stroke counter pulse output)

(Stroke counter connection)

            (Pressure signal monitor connection)

(Switch to force the MizAir valve into a closed position )

DIP SWITCH SETTINGS

1. The DIP switches are used to select the code for the microcontroller appropriate to the pump model, size and equipment being used.

2. The DIP switches are located beneath the rubber oval access cap.  To access the DIP switches remove the rubber access cap.

3. The closest switch to the internal wiring connector is #1 and the furthest is #4. 

4. Once selected, no further DIP switch changes should be required unless the MizAir is moved to a different size or model of pump.

5. Select the pump model, size and equipment below to obtain the correct DIP switch setting.

6. If your pump model and/or size is not shown on the chart, please contact the factory.  Your pump may not be compatible.

7. The MizAir  code is generally robust enough to allow you to set the DIP switch to a pump size and diaphragm close to what you have.  Savings may not be optimized, but overall pump compatibility may be determined.                            DO NOT ADJUST THE TWO LOWER CALIBRATION POTS WITH YELLOW TBRQWZ SEAL ON THEM, THESE ARE FACTORY SET ONLY.

8. Replace oval when finished and rubber cap.

DIP SWITCH

 1   2   3   4

 1   2   3   4

 1   2   3   4

 1   2   3   4

= Raised Position

= Lowered Position

All switches raised, ideal for 3” pump setups.

 

Wilden valve series P, PV, and PX. All diaphragm types.

Also used for IR-ARO 3” EXP series pumps.

Switch 1 lowered, all others raised, ideal for 2” rubber pumps.

 

Valve series P, PV, and PX. All soft, flexible rubber diaphragms.

Switch 2 lowered, all others raised, ideal for Wilden 2” pumps.

 

Valve series P, PV, and PX. All Teflon and similar stiff diaphragm materials.

Switch 1 and 2 lowered, switch 3 and 4 raised, ideal for the Wilden 2” stainless pump with Santoprene.

1. Remove the oval rubber access cap.

2. Apply 24VDC electrical power to the MizAir.  If 24VDC is already present, momentarily break the power connection.

3. Inside the MizAir are many LED’s.  Observe the yellow one.  The sequence is long flashes separated by three quick flashes.

4. Example; On power up if  the yellow LED flashes:                                                                                                           LONG-LONG-quick-quick-quick-LONG-quick-quick-quick-LONG-LONG-LONG-quick-quick-quick                    This sequence would indicate software code version 2.1.3

5. The yellow LED is also useful as a trouble shooting tool.  This LED is regularly asked by the software to blink once about every 2 seconds.  If the yellow LED is not flashing every 2 seconds this would indicate there is a problem.

Determining the Software Version

Operation

1. As long as the MizAir has 24 VDC power and the pump is running the MizAir is operating.

2. The MizAir adjusts its operation as supply air pressure, pump head, pump speed, and other parameters change.

3. If the pump stalls, or output flow is stopped, the MizAir will supply full pressure to the pump until the pump re-starts.  The MizAir will then resume operation.

4. Observing a pressure gauge installed in the MizAir gauge port will allow observation of the rhythmic cyclical output from the MizAir.  This steady regular pattern of pressure displayed by the gauge is useful in determining that the MizAir is operating properly.

5. The MizAir is a normally open valve.  Removing 24 VDC power from the MizAir will cause the MizAir to open fully.  This allows the pump to operate without the air savings as if the MizAir was not present.

Icing

A diaphragm pump extracts work from the compressed air supplied to it.  This, and the subsequent expansion when the air is exhausted, causes the air to exit the pump at a lower than ambient temperature.  Often this is below the freezing point of water and causes ice formation.  This is a normal consequence of AODD pumps.

 

1. The exhaust air of a diaphragm pump will be much colder when using the MizAir.  You are obtaining the same amount of work with less air, so the air exits colder.

2. Temperatures of –40°F are not uncommon inside the internal exhaust passages of a diaphragm pump using the MizAir

3. These low temperatures cause two potential problems. First, is that the cold causes the moisture in the airstream to condense and ice forms in the exhaust passages and muffler system.  Drying the air is often ineffective as the dew point required is so low.

Second, is the change in dimensions of the moving components of the valve internal to the pump (due to thermal contraction).  Internal valves with tight tolerances, such as lapped spool valves, are susceptible to stalling ,galling and abrasion. This isn’t really “icing” but rather a pump design which is not compatible with the cold temperatures produced by the MizAir.

4. If the pump being used has icing issues without the MizAir, it will be worse with the MizAir.

5. Our experience shows that using a high tolerance internal valve design (i.e. with sealing rings taking up the tolerances) is most likely to be compatible with the MizAir.  Using oversized exhaust mufflers (better heat sink) or piping the exhaust away usually resolves icing.

 

Stalling

The MizAir reduces energy consumption by leaving the diaphragm pump with less air at the end of the stroke.  Consequently, there is less air available to shift the main valve inside the pump.  Pump designs which do not have durable “anti-stall” internal valves which prevent the valve from stopping in a center off position  or on the “off” stroke side generally  are not compatible with the MizAir.  Pumps which have a mechanical reset button on the main valve are most likely to display this problem.

24VDC

Supply Air

(3/4” NPT)

Transferred Product

Product

DIMENSIONS

DIMENSIONS ARE FOR REFERENCE USE ONLY

Inches (mm)

ORDERING INFORMAITON

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