Product Overview
The SX-PDDB series remote seal differential pressure transmitter uses a diaphragm seal assembly to prevent process media from directly entering the pressure sensor of the differential pressure transmitter; pressure is transmitted via fill fluid (such as silicone oil) through capillary tubing. The SX-PDDB series is used to measure level, density, pressure, and flow of liquids, gases, or steam, converting the measurement to a 4–20 mA DC HART signal output. It also supports HART, Profibus PA, and RS-485-Modbus communication protocols. The zero-based measuring is 0–1 kPa to 2 MPa (0–0.145 to 290 psi). Remote seal flange rated pressures are: 1.6/4 MPa, 6.4 MPa, 10 MPa, 150 psi, 300 psi, or 600 psi.
Typical Measurements
- Differential pressure
- Level
- Density
Main Features
- Wide Measuring Range —— 0–1 kPa to 0–2 MPa with continuous turndown adjustment
- Remote Seal Protection —— Diaphragm seal assembly isolates process media from the sensor for reliable measurement in harsh applications
- Multiple Fill Fluids —— Silicone oil | High-temperature silicone oil | Ultra-high-temperature silicone oil | Food-grade fluid | Ultra-low-temperature fluid
- Flexible Flange Options —— Flush or insertion type; DN50 / DN80 / DN100 / 2" / 3" / 4" flanges compliant with DIN 2501 and ANSI B16.5
- Flexible Capillary Configurations ——1–12 m capillary length with 304 or 316 stainless steel material; optional PVC protection sheath
- Multiple Communication Protocols —— 4–20 mA HART | RS-485 Modbus | Profibus PA
- Hazardous Area Certification —— Intrinsic Safety ATEX | Flameproof ATEX (optional)
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Rugged Industrial Housing —— Epoxy-coated aluminum alloy or 316 stainless steel housing; IP67 protection with 360° rotation capability
Product Application
Industries Served
| Oil & Gas | Power Generation | Food & Beverage |
| Petrochemical & Chemical | Water & Wastewater | Pharmaceutical |
| Metal Smelting | Pulp & Paper | Marine & Offshore |
Technical Data
| Measurement | |
| Measured Parameters | Differential pressure |
| Measuring Range | 0–1 kPa to 0–2 MPa (0–0.145 to 290 psi) |
| Span Adjustment | Continuous adjustment from −100% URL to +100% URL |
| Response Time | Sensor + seal time constant 0.2–6 s; adjustable damping 0.1–60 s |
| Remote Seal System | |
| Remote Seal Design | Diaphragm seal assembly isolates process media from sensor |
| Remote Seal Type | Flush type or insertion type |
| Flange Sizes | DN50 / DN80 / DN100 / 2" / 3" / 4" |
| Flange Standards | DIN 2501 / ANSI B16.5 |
| Capillary Length | 1–12 m |
| Capillary Material | 304 stainless steel / 316 stainless steel (optional PVC sheath) |
| Fill Fluids | Silicone oil / High-temperature silicone oil / Ultra-high-temperature silicone oil / Food-grade fluid / Ultra-low-temperature fluid |
|
Power & Output |
|
| Supply Voltage | 9–36 V DC (13.5 V DC minimum with LCD/OLED display) |
| Analog Output | 4–20 mA, 2-wire, loop-powered; linear or square-root selectable |
| Digital Communication | HART / RS-485 Modbus / Profibus PA |
| Cable Entry | M20×1.5 or ½ NPT female thread |
| Wire Cross-Section | 0.5–2.5 mm² |
| Environmental Conditions | |
| Ambient Temperature | Maximum +85°C (depends on fill fluid) |
| Process Temperature | −30 to +400°C |
| Ingress Protection | IP67 (IEC 60529) |
| Shock Resistance | 50 g / 11 ms (IEC 60068-2-27) |
| Vibration Resistance | 2 g up to 500 Hz (IEC 60068-2-6) |
| Process Connection & Materials | |
| Pressure Connection | ¼" NPT female & 7/16" UNF female (transmitter body); ANSI B16.5 / DIN 2501 remote seal flange |
| Remote Seal Rated Pressure | ANSI B16.5: 150 psi–600 psi; DIN 2501: PN1.6 MPa–PN10 MPa |
| Diaphragm Materials | 316L stainless steel / Hastelloy C / Tantalum |
| Process Flange Material | 304 stainless steel |
| Housing Material | Epoxy-coated aluminum alloy / 316 stainless steel |
Certifications & Compliance
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