Pressure
High-quality pressure sensor with mounted diaphragm seal
With flange connection, internal diaphragm
Model DSS26T
WIKA data sheet DS 95.10
Applications
■■ For aggressive, highly viscous, crystallising or hot media
■■ Machine building and plant construction
■■ Process industry
■■ For small flange process connections
Special features
■■ Open flange with internal, all welded diaphragm
■■ No sealings and clamping elements
■■ Robust, all welded design
■■ Compact design
Diaphragm seal system, model DSS26T
Description
Diaphragm seal systems are used to protect the pressure The DSS26T is ideally suited for demanding measuring tasks
measuring instrument from aggressive, adhesive, and achieves a very high accuracy. It offers the advantage
crystallising, corrosive, highly viscous, environmentally of being able to transmit the measuring signal directly and to
hazardous or toxic media. The diaphragm made of stainless combine it with a variety of electrical connections.
steel provides for the separation from the medium. The
pressure is transmitted to the measuring instrument via the Mounting of the diaphragm seal to the measuring instrument
system fill fluid which is inside the diaphragm seal system. is made via direct mounting as standard.
Due to its design – with open flange connection and internal The DSS26T is particularly well suited for aggressive, highly
diaphragm – the DSS26T is suitable for all currently used viscous, crystallising or hot media. The measuring system is
standard flanges and is mounted to small process connec- successfully used worldwide in chemical and petrochemical
tions for pressure measurement. industries with high measuring requirements.
WIKA data sheet DS 95.10 ∙ 07/2018 Page 1 of 5
Data sheets showing similar products:
High-quality pressure sensor with mounted diaphragm seal; for the chemical and petrochemical industries; model DSS27T;
see data sheet DS 95.13
Specifications
Model DSS26T
Design High-quality pressure sensor, flange-type diaphragm seal, internal diaphragm
Current output 4 ... 20 mA (2-wire)
Power supply DC 8 ... 35 V
Accuracy at reference ≤ ±0.5 % of span
conditions
Permissible load in Ω ≤ (power supply - 7.5 V) / 0.023 A
Current supply Max. 25 mA
Dissipation loss 828 mW
Reference conditions Temperature: 15 ... 25 °C (59 ... 77 °F)
(per IEC 61298-1) Atmospheric pressure: 860 ... 1,060 mbar (12.5 ... 15.4 psi)
Humidity: 45 ... 75 % r. h.
Power supply: DC 24 V
Mounting position: Calibrated in vertical mounting position with pressure connection facing downwards
Pressure limitation < 10 bar (150 psi): 3 times
≥ 10 bar (150 psi): 2 times
Permissible temperature range
Medium -10 ... +150 °C (14 ... 302 °F)
Ambient 10 ... 40 °C (50 ... 104 °F)
Storage 10 ... 60 °C (50 ... 140 °F)
Ingress protection IP65 per IEC/EN 60529
Material
wetted Diaphragm: Stainless steel 1.4435 (316L)
Upper body of diaphragm seal, stainless steel 1.4435 (316L)
non-wetted Case: Stainless steel 1.4571 (316Ti)
Zero adjustment ring: PBT/PET GF30
Angular connector: PBT/PET GF30
Level of cleanliness of wetted Oil and grease free per ASTM G93-03 level F and ISO 15001 (< 1,000 mg/m²)
parts
System fill fluid Silicone oil KN 2 for general applications
Permissible humidity ≤ 67 % r. h. at 40 °C (104 °F) (in accordance with 4K4H per EN 60721-3-4)
(per IEC 68-2-78)
Measuring ranges in bar (psi)
Gauge pressure
0 ... 6 (0 ... 100) 0 ... 10 (0 ... 160) 0 ... 16 (0 ... 250) 0 ... 25 (0 ... 300)
Vacuum and +/- measuring range
-1 ... +5 (-30 inHg ... +70) -1 ... +9 (-30 inHg ... +130) -1 ... +10 (-30 inHg ... +145)
WIKA data sheet DS 95.10 ∙ 07/2018 Page 2 of 5
Electrical connection
Angular connector DIN 175301-803 A
Electrical connection Ingress protection 1) Wire cross-section Cable ∅ Permissible temperature
with mating connector IP65 max. 1.5 mm² 6 ... 8 mm -30 ... +100 °C (-22 ... +212 °F)
1) Only applies when plugged in using a suitable mating connector that has the appropriate ingress protection.
Connection diagram
Angular connector DIN 175301-803 A, 2-wire
U+ 1
1
3 U- 2
2
Shield (option) 4
Installation example, model DSS26T
Pressure sensor
H
Direct mounting
d4
Diaphragm seal
k
Diaphragm
(welded to diaphragm seal) D
b
Legend:
H Installation height
f
D Outer diameter of diaphragm seal
d4 Sealing face diameter
k Pitch circle diameter 14216001.01
b Flange thickness
f Height of raised face
WIKA data sheet DS 95.10 ∙ 07/2018 Page 3 of 5
Dimensions in mm (in)
14216000.01
≈
Legend:
H Installation height
Mb Effective diameter of diaphragm
D Outer diameter of diaphragm seal
b Flange thickness
d₂ Bore diameter
f Height of raised face
k Pitch circle diameter
G₁ Thread
d₄ Sealing face diameter
x Number of bores
Type of process connection: Flange connection following EN 1092-1
Sealing face: Form B1
DN PN Dimensions in mm (in) x
H Mb D b f k d2 d4
25 10/40 158 (6.221) 52 (2.047) 115 (4.528) 22 (0.866) 2 (0.079) 85 (3.346) 14 (0.551) 68 (2.677) 4
Type of process connection: Flange connection following ASME B16.5
Sealing face: RF 125 ... 250 AA
DN Class Dimensions in mm (in) x
H Mb D b f k d2 d4
½" 150 158 (6.221) 32 (1.26) 90 (3.543) 22 (0.866) 2 (0.079) 60.3 (2.374) 16 (0.63) 34.9 (1.374) 4
300 40 (1.574) 95 (3.740) 66.7 (2.626)
1" 150 52 (2.047) 110 (4.330) 79.4 (3.126) 50.8 (2.0)
300 125 (4.921) 88.9 (3.5) 19 (0.748)
WIKA data sheet DS 95.10 ∙ 07/2018 Page 4 of 5
Certificates (option)
3.1 inspection certificate per EN 10204 (e.g. material proof
for wetted metallic parts, calibration certificate)
Approvals and certificates, see website
Ordering information
Scale range / Process connection (type of process connection, pipe standard, pipe dimension) / Material of wetted parts /
Certificates
© 05/2017 WIKA Alexander Wiegand SE & Co. KG, all rights reserved.
The specifications given in this document represent the state of engineering at the time of publishing.
We reserve the right to make modifications to the specifications and materials.
07/2018 EN
WIKA data sheet DS 95.10 ∙ 07/2018 Page 5 of 5
WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel. +49 9372 132-0
Fax +49 9372 132-406
info@wika.de
www.wika.de
