ion-Air's unique closed loop control technology for supe-
rior control of pressurized gases and fluids.

The MM delivers pressure control which is linear and pro-
portional to either a DC current or DC voltage command
signal.

The MM is designed to have "Universal Mounting" capa-
bilities which include DIN rail, panel mount, or manifold
mounting for use on a sub-base for multiple unit applica-
tions. Sub-base configurations are available from 2-12
units (consult factory for more units). The sub-base offers
a common supply and exhaust port with individually con-
trolled outlet ports to minimize plumbing connections and
maximize installation/maintenance efficiency.

The MM1 uses two solenoid valves to control system pres-
sure. One valve functions as an inlet control, the other as
an exhaust control. A strain gauge pressure transducer
measures the system pressure and provides a feedback
signal to the electronic controls. This feedback signal is
compared against the command signal. Any difference
between the two signals causes one of the valves to open
allowing pressure in or out of the system. Closed loop
proportional control of pressure is maintained in this man-
ner.

The MM2 is similar to the MM1 but uses a double loop
control scheme. In addition to the internal pressure trans-
ducer, the MM2 also receives a feedback signal (0-10Vdc
standard) from an external sensing device. The external
signal functions as the primary feedback and is compared
to the command signal. This comparison is summed with
the internal pressure transducer signal. A difference be-
tween the two comparisons causes one of the two solenoid
valves to open, allowing pressure in or out of the system.

Since the secondary feedback is an electrical signal, many
types of sensors may be used as feedback such as pressure,
force, position, flow, etc.

A 0-10Vdc analog output is also standard on both the
MM1 and MM2 and can be used for data acquisition or
taken to a panel meter for display.

MM1/MM2 INSTALLATION & MAINTENANCE INSTRUCTIONS

DESCRIPTION / IDENTIFICATION

PANEL MOUNT
MANIFOLD MOUNT
DIN RAIL 2/8
INMM1-2
04/02/07 DC
SPECIFICATIONS
MIN
TYP
MAX
TERM
Supply Voltage
15
-
24
Vdc
Supply Current
35
-
250
mA max
Command Signal Impedance Voltage
Current
-
-
4700
100
-
-
Ohms
Ohms
2nd Loop Signal Impedance
-
4700
-
Ohms
Monitor Signal
0
-
10
Vdc @ 10mA
PHYSICAL

Operating Temperature
32 (0)
-
158 (70)
°F (°C)
Weight per unit (sub-base not included)
-
0.7 (0.3)
-
Lb (Kg)
MECHANICAL

Pressure Ranges
29.9 in. Hg (vac)
(3)

760 mm Hg (vac)
-
-
300*
(1)

20.68
Psig
Bar
Cv Capacity
-
0.04
-

Min Closed End Volume
-
1 (17)
-
in³ (cm³)
Filtration Recommended
40
-
-
micron
Hysteresis
0
+0.15
0.4
% F.S. (Adjustable)
(2)

Repeatability
-
+0.02
-
% F.S.
(2)

Accuracy / Linearity
-
+0.2
-
% F.S.
(2)

Temperature Effect
-
+1
-
% F.S.
(2)

Wetted Parts
Elastomers..Fluorocarbon
Manifold.Brass
Valves.Nickel plated brass
P. Transducer ....Silicon, Aluminum, RTV
(1) Pressure ranges are customer specified, others available.
(2) The hysteresis of the MM series is adjustable. See step 9 of the Calibration Procedure. Adjusting the hysteresis also af-
fects repeatability, accuracy and linearity.
(3) MM units for vacuum only service are designed to provide pressure control of a vacuum level that is linearly proportional
to an analog electronic command. Vacuum only service units always provide a higher level of vacuum for a higher analog
command. A typical example is 4-20mA = 0-20in Hg vacuum, where 4mA gives 0in Hg and 20mA gives 20in Hg vacuum.
Vacuum through positive pressure units must have positive pressure equal to or greater than vacuum level.
ELECTRICAL
Command Signal Voltage
Current
0
4
-
-
10
20
Vdc
mA differential
Before you get started, please read these warnings:

Examine the product. Ensure that you received what you ordered.
Read this guide first before you start and save it for later use.
You must have a good understanding of what the adjustments are on this product before using them.
All compressed air and power should be shut off before installing, removing or performing maintenance on this product.
Installation and use of this product should be under the supervision and control of properly qualified personnel in order to
avoid the risk of injury or death. 3/8
INMM1-2
04/02/07 DC
CONNECTION PROCEDURE
Pneumatic Connections

1. Apply a small amount of anaero-
bic sealant to the male threads of
the in-line filter supplied with the
MM. Units with S938 option are
not shipped with in-line filter.
2. Connect supply pressure to the I
port (figure 2) not to exceed rated
supply pressure. (See table 1) Be
sure to look at the stamping be-
cause the supply I and the
exhaust E ports are reversed
in high pressure units. For units
with S938 option, the supply I
and the exhaust E ports are re-
vered. The supply pressure must
be connected to E port.
3. Connect the outlet O port
(figure 2) to the device being con-
trolled.
4. Proceed with electrical connec-
tion.
MAX calibrated pressure of:
Max inlet pressure is:
-1 up to 1 psig (-0.07 to 0.07 bar)
Consult factory
Vacuum up to 30 psig (Vacuum to 2.07 bar) 35 psig (2.41 bar)
31 up to 100 psig (2.14 to 6.89 bar)
110 psig (7.58 bar)
101 up to 175 psig (6.96 to 12.07 bar)
190 psig (13.10 bar)
176 up to 300 psig (12.13 to 20.68 bar)
330 psig (22.75 bar)
TABLE 1
RATED PRESSURE FOR MM VALVES
DIN Rail Mount

Mounting

The DIN rail MM servo valve comes assembled to a DIN rail
with a universal foot to allow all modules to be snapped onto
all available DIN footprints:
Panel Mount

Mounting

The panel mount MM servo valve can be assembled to a
panel by inserting two 8-32 socket head cap screws into the
manifold and torque each screw into the panel (figure 3).
Figure 1
Pneumatic Connections
1. Apply a small amount of anaero-
bic sealant to the male threads of
the in-line filter supplied with the
MM. Units with S938 option are
not shipped with in-line filter.
2. Connect supply pressure to the I
port (figure 4) not to exceed rated
supply pressure. (See table 1) Be
sure to look at the stamping be-
cause the inlet I and the ex-
haust E ports are reversed in
high pressure units. For units
with S938 option, the supply I
and the exhaust E ports are re-
vered.
3. Connect the outlet O port
(figure 4) to the device being con-
trolled.
4. Proceed with electrical connec-
tion.
Figure 2
DIN Rail Mount

Figure 4

Panel Mount

Figure 3
4/8
INMM1-2
04/02/07 DC
MM Manifold Mounting:

Installation:
1. Install the three O-rings in the O-ring grooves of
the sub-base manifold. (figure 5, ref E)
2. Align the MM servo control valve over the three
O-rings. Orientation of the MM unit should be the
same for all MMs on the manifold and can be de-
termined by the I and E marks on the MM
brass manifold and the aluminum sub-base mani-
fold (figure 5, ref item H). Be sure to look at the
stamping because the inlet I and the exhaust
E ports are reversed in high pressure units.
3. Insert the two cap screws that hold the servo valve
to the sub-base manifold. Torque each screw to 8
in-lbs and then torque each cap screw to 13-15 in-
lbs (figure 5, ref item D).
4. To install the sub-base manifold to a panel use
1/4-20 socket head mounting screws (figure 5, ref
item A).

Removal:
1. Disconnect supply air and the electrical connector
from the MM servo valve to be removed.
2. Remove the cap screws that mount the MM servo
valve to the sub-base manifold (figure 5, ref item
D).
3. The MM servo valve may now be lifted free of the
sub-base manifold. Be careful to retain the three
O-rings in their grooves on the sub-base manifold
(figure 5, ref item E).
Pneumatic Connections
1. Connect supply pressure to the I port (figure 5, ref item
H) not to exceed rated supply pressure. (See table 1) Be
sure to look at the stamping because the inlet I and
the exhaust E ports are reversed in high pressure
units.
2. Connect the O port (figure 5, ref item B) to the device
being controlled.
3. Proceed with electrical connection.
Figure 5

Vacuum Only & Vacuum Through Positive Pressure Units

Pneumatic Connections

1. Apply a small amount of anaerobic sealant to the
male threads of the in-line filter supplied with the
MM.
2. Connect vacuum supply to the E port (figure 6).
3. Connect supply pressure to the I port (figure 6)
not to exceed rated supply pressure (See table 1).
Supply pressure is necessary on vacuum to posi-
tive pressure MM units and when a MM air pilots
a volume booster.
4. Connect the outlet O port (figure 6) to the de-
vice being controlled.
5. Proceed with electrical connection.
Vacuum Supply
To Application
Atmospheric or Slightly Positive
Pressure
Figure 6
5/8
INMM1-2
04/02/07 DC
Electrical connections
1. Ensure all power is off before making any elec-
trical connections.
2. Figure 7 shows the location of the MM electri-
cal connector and Table 2 identifies e