
Technical Datasheet
D-Series
Flanged Seals with Flush Diaphragm
Models: S-Ch
L
TDS-SP-A: FEB 2014
Remote connection with:
smart and analog
pressure and differential
pressure transmitters
Dm
d1
K
D
Direct connection with:
40
d
smart and analog pressure and
differential pressure transmitters
DIN 2512 Form N standard contact face
(DN50 PN40)
Acc. PN-EN-1092-1:2010 Typ B1
(DN80 PN40, DN100 PN40)
Length of cover:
54 mm for capillary £ 3 m
84 mm for capillary > 3 m
Capillary from 1 to 3 m
(special versions up to 6 m)
4 × Æ9
34.5
34.5
Version
DN50 PN40/
2’’ANSI 150
DN80 PN40
3’’ ANSI 150
DN100 PN40
4’’ ANSI 150
Dimensions
Diaphragm
diameter
Dm
59
59
89
75
89
89
Contact face
diameter
d1
102
92
138
127
162
158
Diameter of
bolt circle
K
125
120,5
160
152,5
190
190,5
External
diameter
D
165
150
200
190
235
230
Thickness
d
22
20
24
24
24
24
Diameter
of holes
L
18
20
18
20
22
20
Number
of holes
4
4
8
4
8
8
Models: S-P
D-Series
www.delta-controls.com

Application
The diaphragm seal is a pressure transmitting, diaphragm-type device. The pressure signal is sent to the cooperating
pressure measuring device (pressure transmitter, pressure gauge) through manometric liquid filling the space between the
separating diaphragm of the seal and the pressure measuring device. The diaphragm seal task is to isolate the pressure
measuring device from damaging impacts caused by either medium or installation:
s Low or high temperature, increased viscosity, and impurities
s Vibrations of the installation (remote diaphragm seal)
Measuring Ranges
Recommended minimum measuring range (bar),
depending on the type of the set: pressure measuring device - diaphragm seal
Pressure
measuring device
Smart
transmitters∗
DPCE-28
*The ranges given in the table for the smart transmitters should be taken as set ranges
Additional absolute zero error resulting from ambient temperature fluctuations,
depending on the type of the set: pressure transmitter - diaphragm seal
Diaphragm seal type
DN50 / 2’’ DN80/ 3’’ DN100 / 4’’
direct 0.5 mbar 0.4 mbar 0.4 mbar
remote (2 m capillary) 3 mbar 1 mbar 1 mbar
Diaphragm
seal type
direct 0.25 0.1 0.1
remote (2 m) 1 0.25 0.25
direct 0.1 0.1 0.1
remote (2 m) 1 0.25 0.25
Absolute zero error per 10°C for the diaphragm seal
DN50 / 2’’ DN80 / 3’’ DN100 / 4’’
Diaphragm seal version
An additional zero error, resulting from
temperature fluctuations in a medium,
depends on the temperature gradient in
the oil-based diaphragm sealing
system. The error value is, in any case,
significantly smaller than the error value
shown in the table.
Temperature range of measured medium
Remote diaphragm seal Direct diaphragm seal
Manometric liquid Underpressure measurements Overpressure measurements
high-temperature (DC) -10...150°C -10...315°C -30...150°C
low-temperature (AK) not recommended for measurement
of pressures < 0.5 bar ABS
Note: When operating with an ambient temperature of < -15°C, heating of capillaries filled with DC fluid is recommended.
Maximum pressure for PN40 – 40 bar
Maximum pressure for ANSI 150 – 150 psi
Material of diaphragm and flange 316Lss
Important:
- contact face in diaphragram seal DN50 have a milled slot for a gasket (acc. to DIN 2512 FormN). Version without any
slot available on request. (acc. to DIN 2526 FormE)
- standard outlet capillary from flange:
direct mounted diaphragm seal - axial
remote mounted diaphragm seal - radial
-60...200°C
Special versions
- Other standard ANSI or DIN
- Filled with edible oil (medium temp. -10...150°C)
- Direct diaphragm seal for medium temp. over 150°C
- Others
Recommendations
The essential metrological problem with diaphragm seal operational use is the absolute thermal zero error, which results
from the thermal expansion of the manometer liquid. The expansion effect must be compensated for by the separating
diaphragm’s flexibility.
To minimise this effect, it is advisable to:
s Use capillaries which are as short as possible - in this way, the volume of manometer liquid will be reduced
s Use seals with greater diameters in order to maximise the flexibility of the separating diaphragm
s Place the capillaries in places in which the temperature fluctuations will be minimal
Models: S-P
D-Series
www.delta-controls.com