37
Using an Electronic Pressure Switch for Purge Control
The best choice if using a pressure switch is to select an
electronic programmable type pressure switch which is
effectively a pressure transmitter and process controller
built into one device. While significantly more costly than
a standard pressure switch, an electronic programmable
pressure switch can be setup to provide a much more
customized operation. Typically, the dead band can be
reduced or eliminated so that an immediate reaction to
system pressure in system indicating air flow, can
be obtained.
Section 7:
Energy Management
Figure 7.6 Electronic pressure switch for purge control (LED Controller)
37
PRODRY PD0046 - PD0360 Instruction Manual
|
Walker Filtration
|
signal)
Using an electronic pressure switch for purge control
The best choice if using a pressure switch is to select an
electronic programmable type pressure switch which is
effectively a pressure transmitter and process controller
a standard pressure switch, an electronic programmable
pressure switch can be setup to provide a much more
customised operation. Typically, the dead band can be
reduced or eliminated so that an immediate reaction to
It is extremely important to understand that the purge may
only be shut during periods of low or no demand. This
feature, if used otherwise, can result in permanent damage
to the desiccant beds resulting in loss of drying capacity
and possibly mechanical failure. The cartridges must not be
allowed to become fully saturated at any time.
an overview of the devices
mentioned as they might be connected for use in controlling
d er between device manufacturers, so in all cases the
Se ct io n 7:
Energy Management
This setup is for example only. This configuration can be
amended, depending on application.
SY
ST
EM
PR
ES
SU
RE
(p
sig)
PURGE ON (switch deactivated)
PURGE ON (switch deactivated)
PURGE OFF (switch activated)
PURGE OFF
ON
OFF
105
100
95
90
85
85
80
ADJUST TO SUIT SYSTEM
(pressure switch deactivation point)
Fig 7.5 P ressu re switch setti ng
DC Power
Supply
-VDC (COM)
+VDC
+VDC
Output
CO
M
Electronic
Pressure Switch
Relay
N.C.*
Fig ure 7.6 Electr onic press ure switc h for p urge co ntro l (LED Cont)
Fig ure 7.7 Electr onic press ure switc h for p urge co ntro l (DMC Cont)
* Normally open, close to turn off purge
Pin 1
Pin 2
Signal Out to Switch (+24VDC
)
DMC
Controller
1
2
3
* Normally Closed, open to turn purge off
Signal Back
DC Power
Supply
-VDC (COM)
+VDC
+VDC
Output
CO
M
Electronic
Pressure Switch
Relay
N.O.*
Signal Back
LED Controller
Pin 1
(Puts out
+5 VDC
signal)
Pin 2
1
2
3
Figure 7.7 Electronic pressure switch for purge control (DMC Controller)
37
PRODRY PD0046 - PD0360 Instruction Manual
|
Walker Filtration
|
signal)
Using an electronic pressure switch for purge control
The best choice if using a pressure switch is to select an
electronic programmable type pressure switch which is
effectively a pressure transmitter and process controller
a standard pressure switch, an electronic programmable
pressure switch can be setup to provide a much more
customised operation. Typically, the dead band can be
reduced or eliminated so that an immediate reaction to
It is extremely important to understand that the purge may
only be shut during periods of low or no demand. This
feature, if used otherwise, can result in permanent damage
to the desiccant beds resulting in loss of drying capacity
and possibly mechanical failure. The cartridges must not be
allowed to become fully saturated at any time.
an overview of the devices
mentioned as they might be connected for use in controlling
d er between device manufacturers, so in all cases the
Se ct io n 7:
Energy Management
This setup is for example only. This configuration can be
amended, depending on application.
SY
ST
EM
PR
ES
SU
RE
(p
sig)
PURGE ON (switch deactivated)
PURGE ON (switch deactivated)
PURGE OFF (switch activated)
PURGE OFF
ON
OFF
105
100
95
90
85
85
80
ADJUST TO SUIT SYSTEM
(pressure switch deactivation point)
Fig 7.5 P ressu re switch setti ng
DC Power
Supply
-VDC (COM)
+VDC
+VDC
Output
CO
M
Electronic
Pressure Switch
Relay
N.C.*
Fig ure 7.6 Electr onic press ure switc h for p urge co ntro l (LED Cont)
Fig ure 7.7 Electr onic press ure switc h for p urge co ntro l (DMC Cont)
* Normally open, close to turn off purge
Pin 1
Pin 2
Signal Out to Switch (+24VDC
)
DMC
Controller
1
2
3
* Normally Closed, open to turn purge off
Signal Back
DC Power
Supply
-VDC (COM)
+VDC
+VDC
Output
CO
M
Electronic
Pressure Switch
Relay
N.O.*
Signal Back
LED Controller
Pin 1
(Puts out
+5 VDC
signal)
Pin 2
1
2
3
37
PRODRY PD0046 - PD0360 Instruction Manual
|
Walker Filtration
|
signal)
Using an electronic pressure switch for purge control
The best choice if using a pressure switch is to select an
electronic programmable type pressure switch which is
effectively a pressure transmitter and process controller
a standard pressure switch, an electronic programmable
pressure switch can be setup to provide a much more
customised operation. Typically, the dead band can be
reduced or eliminated so that an immediate reaction to
It is extremely important to understand that the purge may
only be shut during periods of low or no demand. This
feature, if used otherwise, can result in permanent damage
to the desiccant beds resulting in loss of drying capacity
and possibly mechanical failure. The cartridges must not be
allowed to become fully saturated at any time.
an overview of the devices
mentioned as they might be connected for use in controlling
d er between device manufacturers, so in all cases the
Se ct io n 7:
Energy Management
This setup is for example only. This configuration can be
amended, depending on application.
SY
ST
EM
PR
ES
SU
RE
(p
sig)
PURGE ON (switch deactivated)
PURGE ON (switch deactivated)
PURGE OFF (switch activated)
PURGE OFF
ON
OFF
105
100
95
90
85
85
80
ADJUST TO SUIT SYSTEM
(pressure switch deactivation point)
Fig 7.5 P ressu re switch setti ng
DC Power
Supply
-VDC (COM)
+VDC
+VDC
Output
CO
M
Electronic
Pressure Switch
Relay
N.C.*
Fig ure 7.6 Electr onic press ure switc h for p urge co ntro l (LED Cont)
Fig ure 7.7 Electr onic press ure switc h for p urge co ntro l (DMC Cont)
* Normally open, close to turn off purge
Pin 1
Pin 2
Signal Out to Switch (+24VDC
)
DMC
Controller
1
2
3
* Normally Closed, open to turn purge off
Signal Back
DC Power
Supply
-VDC (COM)
+VDC
+VDC
Output
CO
M
Electronic
Pressure Switch
Relay
N.O.*
Signal Back
LED Controller
Pin 1
(Puts out
+5 VDC
signal)
Pin 2
1
2
3
Figure 7.5: Typical installation
It is extremely important to understand that the purge may
only be shut off during periods of low or no demand. This
feature, if used otherwise, can result in permanent damage
to the desiccant beds resulting in loss of drying capacity
and possibly mechanical failure. The cartridges must not be
allowed to become fully saturated at any time.
Figures 7.6 and 7.7 offer an overview of the devices
mentioned as they might be connected for use in controlling
a dryer’s purge function. Please note that specific details
differ between device manufacturers, so in all cases the
manufacturer’s specifications should be adhered to.
This setup is for example only. This configuration
can be amended, depending on application.
