Digital Differential Pressure Sensor

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TALGIL COMPUTING & CONTROL LTD.
P.O.B. 775 Kiryat Motzkin 26119
Tel : 972-4-8775948 Fax : 972-4-8775949
E-mail : [email protected]
Digital Differential Pressure Sensor
The digital differential pressure sensor DP measures the pressure difference between two
points and when the difference exceeds a predefined set-point it reacts by closing a dry
contact output. The unit is meant to be used with backwashing systems of automatic filters, it
is highly accurate and low power consuming.
The red LED – blinks
during normal operation
and blinks fast when the
battery is low
The green LEDis ON when the
contact is closed
JP4- LEDS
active/ not active
JP5- for laboratory
use- DON’T
TOUCH !
JP1- for laboratory
use- DON’T
TOUCH !
Manual test
switch
S1 – 4 dip
witches
for set point
setting
12 volt DC or
24 volt AC
Red command tube to
the high pressure point
Black command tube
to low pressure point
Dry contact output
with no polarity for
signaling external
controller
Starting Up
The electronic board contains 4 dip-switches (S1) which serve for starting up the system and
selecting the reaction set-point. When all the 4 switches are in OFF position (pointing down)
the unit is not active. When there is at least one switch ON (pointing up) the unit is active. The
active state is indicated by the blinking of the red LED, a short blink each 5 seconds.
TALGIL COMPUTING & CONTROL LTD.
P.O.B. 775 Kiryat Motzkin 26119
Tel : 972-4-8775948 Fax : 972-4-8775949
E-mail : [email protected]
Reaction set-point setting
The state of the 4 dip-switches S1 defines the pressure difference at which the unit will react
by closing its dry contact output, this point is known as the reaction set-point. As long as the
pressure difference stays above the defined set point the contact remains closed. The
following table shows the connection between the position of S1 and the pressure difference
associated with each setting,
Position No.
S1 (1-ON ; 0-OFF)
Reaction pressure difference
1 2 3 4
Atm.
psi
00
0 0 0 0
01
1 0 0 0
0.1
2
02
0 1 0 0
0.3
4
03
1 1 0 0
0.4
6
04
0 0 1 0
0.5
8
05
1 0 1 0
0.7
10
06
0 1 1 0
0.8
12
07
1 1 1 0
1.0
14
08
0 0 0 1
1.1
16
09
1 0 0 1
1.2
18
10
0 1 0 1
1.4
20
11
1 1 0 1
1.5
22
12
0 0 1 1
1.6
24
13
1 0 1 1
1.8
26
14
0 1 1 1
1.9
28
15
1 1 1 1
2.0
30
The unit is not active
The red LED indications
The LED behavior
The LED is OFF
A short blink every 5 seconds
3 fast blinks every 5 seconds
Indicated state
The unit is not active
Normal operation & battery level above 9.5 v
Operating with low battery, less than 9 v
TALGIL COMPUTING & CONTROL LTD.
P.O.B. 775 Kiryat Motzkin 26119
Tel : 972-4-8775948 Fax : 972-4-8775949
E-mail : [email protected]
Testing the dry contact operation
The electronic board contains a “test switch” that when pushed will cause the dry contact to
be closed for 5 seconds. As usually, the closing of the contact will be indicated by lighting the
green LED.
Remarks
It is necessary to use a filter between the high pressure point and the RED command
tube to eliminate blocking the command tube by the unfiltered water.
For energy saving purposes the pressure difference is checked every 15 seconds.
Then 16 samples are taken continuously, the average of these samples is considered
as the current pressure difference reading.
For energy saving purposes the position of JP4 can be changed so that the middle pin
will be connected to the upper pin (instead of to the lower pin). As a result of this, the
LED indications will be stopped.
The user is not permitted to touch any of the jumpers except for JP4 ! Any change in
the position of the jumpers may disturb the operation of the unit. The correct jumpers
setting is as shown in the picture above.
When the battery voltage drops bellow 6.5 volts the dry contact is opened regardless of
the pressure difference and the unit turns itself OFF.
CONNECTION DIAGRAMM FILTRON 8 DC AND DP ELECTRONIC
FILTRON 8 DC
FP1801
CONNECTION BOARD (FILTRON 8 DC)
LCD & keyboard
plug
BUZZER
Sets LCD
type
DP Electronic DP0002
F 3.6
DC
FILTRON 8 DC
OUTPUTS 1 - 8
OUT 4
OUT 6
OUT 8
OUT 2
+ O C + O C + O C + O C
+ G G
BATT.
+ O C + O C + O C + O C
OUT 1
OUT 3
OUT 5
OUT 7
INPUTS 1 - 8
IN 2
I C
I C
IN 1
IN 4
I C
IN 6
I C
I C
IN 3
I C
IN 5
IN 8
I C
I C
IN 7
Input 1 : differential pressurstat
C
O
+
+
_
Battery
12V
SOLENOID
NO
NC
Black
Red
Red
Black
White
White
FOR INPUTS
I - Input
C - Common of inputs
Input 2 : pressurstat
Input 3 : water meter
DP ELECTRONIC
CARD
White
White
Green
Green
Red
Red
Black
Black
Non polarity power
connection
CONNECTION DIAGRAMM FILTRON 246 AC AND DP ELECTRONIC
FILTRON 246 - 2 AC
FP2120
FILTRON 246 - 4AC
FP2140
FILTRON 246 - 6 AC
FP2160
CONNECTION BOARD (FILTRON 246 AC)
O
N
1 23 45 67 8
24 VAC
c
FUSE 2A
OUT 1
c
OUT 2
c
OUT 3
c
OUT 4
c
OUT 5
c
OUT 6
+-
In G
DIP SWITCH
COUNTER
NOT USED
White
SOLENOID 24V AC
Green
Red
Black
DP Electronic DP0002
TRANSFORMER
220V / 24V AC
Black
Red
DP ELECTRONIC
CARD
Green
White
CONNECTION DIAGRAMM FILTRON 246 DC AND DP ELECTRONIC
FILTRON 246 - 2 DC
FP1140
FILTRON 246 - 4DC
FP1140
FILTRON 246 - DAC
FP1160
CONNECTION BOARD (FILTRON 246 DC)
ON
1 23 45 6 7 8
+
-
BATT
+ O C
+ O C
OUT 1
OUT 2
+ O C + O
OUT 3
OUT 4
C
+ O
OUT 5
C
+
O
OUT 6
+ -
C
In G
DIP
SWITCH
COUNTER
NOT USED
SOLENOID
12V DC LATCH
Normally
Closed
Normally
Open
c
Red
Black
White
o
Black
Red
Green
+
White
White
Black
Red
DP Electronic
DP0002
Red
Black
BATTERY 12V
DP ELECTRONIC
CARD
Non polarity power
connection
Green
White
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