IOM-764P / PD
3
particles over 20 microns. Desiccant dried air
is absolutely required for outdoor installations
ex posed to freezing temperatures.
14. For 764PD the system must be designed such that
the “HIGH” pressure is always at a higher value
than the “LOW” pressure is at the same time. If
the expected HIGH and LOW pressures reverse
with respect to each other, the unit will become
inoperative, and the output will increase towards
full IAS pressure of 18–20 psig (1.24–1.38 Barg).
Countersink hole
for #10-32
fl
at heat
machine screw.
Figure 6
Panel Mounted Assembly View
INSTALLED ASSEMBLY
(Bottom View)
PANEL CUTOUT
(Front View)
9. It is recommended that a 764PD be bracket or
panel mounted. A 764PD can be pipe nipple
mounted from 1/4" NPT connection.
10. Clean the piping and tubing of all foreign materials
including chips, burrs, dirt, etc., prior to use.
Use care in applying thread sealant or TFE tape
to prevent excess material from entering the
con nect ing pipe or tubing.
11. Controllers may be oriented in any position in doors.
Outdoors, recommended locations are with the
main lon gi tu di nal axis in a horizontal position,
or with the pneumatic sensor head directed
down wards. Exhibit care to assure rainwater is
pre vent ed from entering the unused exhaust port
(Port A or Port B).
12. Connect piping/tubing per Tables 1 and 2.
13. 764P/PD’s can operate with a lubricated, non-
dried air supply. However, good practice and other
system com po nents (airsets, relays, etc.) dictate
use of the highest quality air supply avail able.
If air can not be practically dried and bears oil,
coalescing filters should be utilized to remove
as much oil and water as possible, as well as
Panel Mounted
. Not factory provided. Requires
field provision of a panel opening and support
bracket per the below dimensions:
* Common applications
Uncommon applications
Adjusting Screw
Panel
#10-32
fl
at head
machine screw and nut
#10-32 machine
screws
TABLE 1
Controller
764P
Action
IAS to Port
Direct
Reverse
A
Supply
Exhaust
B
Exhaust
Supply
Process
Pressures
Above Atm.
Pressure
Increase in
pressure Increases
output signal
Increase in
pressure Decreases
output signal
764PD
Increase in
differential pressure
Increases output
signal
Increase in
differential pressure
Decreases output
signal
Controller
764P
Action
IAS to Port
Direct
Reverse
B
Supply
Exhaust
A
Exhaust
Supply
Vacuum
Process
Below Atm.
Pressure
Increase in
vacuum
Increases output
signal
Increase in
vacuum
Decreases output
signal
NOTE: 764PD cannot be utilized in vacuum service.
TABLE 2
Controller
Pressure Reducing Applications
Controller
Pressure
Adjustment
Actions
IAS to
Port
Control
Valve
Controller
B *
ATO-FC
(REVERSE)
Reverse-
Increase in pressure
decreases output
signal.
Valve "fails closed".
CW = - Pres
CCW = + Pres
A
ATC-FO
(DIRECT)
Direct-
Increase in pressure
increases output signal.
Valve "fails open".
CW = + Pres
CCW = - Pres
Back Pressure/Relief Applications
Actions
B *
ATC-FO
(DIRECT)
Reverse-
Increase in pressure
decreases output
signal.
Valve "fails open".
CW = - Pres
CCW = + Pres
A
ATO-FC
(REVERSE)
Direct-
Increase in pressure
increases output signal.
Valve "fails closed".
CW = + Pres
CCW = - Pres
