Marine approved stainless steel diaphragm pressure transmitter with 4-20mA current loop output for shipbuilding in ranges from 100mb to 600 bar gauge or absolute.
The DMP457 is a high-performance marine-approved pressure transmitter engineered for demanding operational environments encountered in shipbuilding, offshore platforms, and industrial fluid processing. Built around a piezoresistive stainless steel sensor element, the transmitter delivers accurate, reliable pressure measurements across nominal gauge and absolute ranges spanning from 0…100 mbar up to 0…600 bar with standard accuracy of 0.35% FSO and optional high-precision calibration of 0.25% FSO. The device converts pressure parameters into an industry-standard 2-wire 4…20 mA current loop output while operating across broad media temperatures from -40…125°C. Possessing comprehensive type approval certification from major marine classification societies including DNV, Lloyd’s Register (LR), American Bureau of Shipping (ABS), Bureau Veritas (BV), and China Classification Society (CCS), as well as optional ATEX and IECEx intrinsic safety approvals (DX19-DMP457 variant), the DMP457 provides robust mechanical stability, excellent thermal compensation, and superior ingress protection up to IP68 for severe maritime service.
Product Parameters
- Pressure Range: 100 mb up to 600 bar gauge or absolute plus vacuum ranges -1 to 0 bar gauge
- Accuracy: 0.35% full scale BSL NLHR with improved 0.25% for 0.4 bar and above
- Output Signal: 4-20mA current loop
- Electrical Connections: DIN plug, stainless steel field housing or cable gland with IP68 dust and moisture protection
- Pressure Connections: 1/4 or 1/2 inch thread size in BSP or NPT male with semi-flush diaphragm (EN837 only) and open port (1/2 BSP only) style
- Special Features: DNV, LR, ABS, BV, and CCS marine approvals, high accuracy and low range pressures
- Special Options: ATEX and IEC Ex intrinsic safety approval, all welded wetted parts
Product Description
The DMP457 pressure transmitter incorporates advanced piezoresistive stainless steel sensor technology configured with a high-purity 1.4435 (316L) metallic diaphragm. This sensing element delivers superior long-term stability, minimal hysteresis, and exceptional mechanical shock and vibration resistance required for continuous duty on marine vessels and offshore platforms. Operating with an IEC 61298-2 non-linearity, hysteresis, and repeatability accuracy of 0.35% FSO (or optional 0.25% FSO for high-precision monitoring), the transmitter provides stable signal output even under dynamic pressure fluctuations. Integrated thermal compensation electronics maintain narrow tolerance bands over ambient operating conditions, compensating for thermal offset and span shifts across -20…85°C.
Constructed to withstand harsh marine and chemical environments, the standard housing is crafted from corrosion-resistant 1.4404 (316L) stainless steel, with an optional CuNi10Fe1Mn copper-nickel alloy housing and process port available for seawater compatibility. For severe washdown or permanently submerged applications, an integrated stainless steel field housing or vented TPE-U cable assembly achieves IP67 and IP68 ingress protection ratings respectively. Media wetted seals utilize high-grade FKM elastomers, or can be specified with a completely welded construction (for pressures ≤ 40 bar) to eliminate elastomeric sealing elements when handling aggressive fluids or extreme thermal cycles.
Electrical integration is accommodated via a 2-wire 4…20 mA current loop configured for supply voltages from 10…32 VDC. Circuitry includes permanent short-circuit protection and reverse polarity protection to safeguard connected control automation systems. For hazardous location deployments, the DX19-DMP457 variant provides ATEX and IECEx intrinsic safety certifications (Ex ia IIB T4 Ga for gas Zone 0 and Ex ia IIIC T135°C Da for dust Zone 20) when powered through an approved safety barrier operating within 12…28 VDC supply limits. Furthermore, full compliance with international marine classification rules (DNV, LR, ABS, BV, CCS) ensures seamless regulatory approval across shipboard power plant, propulsion, and auxiliary systems.
Product Applications
The DMP 457 marine pressure transmitter has a silicon strain gauge sensing diaphragm protected with a stainless steel oil filled capsule which is compatible with marine applications such as diesel engines, compressors, pumps, boilers, hydraulic and pneumatic controls. ATEX/IECEx approved for intrisically safe use in hazardous environments the DMP 457 marine pressure transmitter is also available for ship systems which are handling flammable and volatile chemicals such as oil, gas, liquid petroleum gas (LPG) and liquid natural gas (LNG).
Marine Diesel Engine Pressure Monitoring
Ensure consistent performance and safety in marine propulsion by precisely tracking fuel injection pressures and monitoring diesel engine operation. The DMP457’s robust stainless steel construction handles the high vibrations and thermal fluctuations typical of engine rooms, providing reliable, continuous feedback for efficient combustion control.
Shipboard Hydraulic Drive Systems
Maintain operational integrity of critical deck machinery and hydraulic systems by monitoring fluid pressure in real-time. The transmitter’s vibration resistance and high-accuracy sensing ensure that hydraulic drive circuits, winches, and steering gear operate within safe parameters, preventing system failures during demanding maritime maneuvers.
Marine and Industrial Compressor Pressure Regulation
Optimize the efficiency and longevity of onboard air compressors through precise pressure regulation. By accurately monitoring discharge and intake pressures, the device helps manage cyclical loading, protecting compressor components from fatigue while maintaining stable output for pneumatic equipment and control air systems.
Boiler Pressure Monitoring and Steam Generation Control
Support safe and efficient steam generation by providing high-fidelity pressure readings for boiler systems. The transmitter’s stable output and thermal compensation allow for precise control of steam pressure, ensuring reliable operation of heating, propulsion, or auxiliary steam processes without drift or measurement errors.
Hydraulic and Pneumatic Control Circuits
Integrate reliable pressure feedback into the complex hydraulic and pneumatic networks found across offshore platforms and vessels. With options for intrinsic safety and rugged environmental protection, the DMP457 provides stable control signals even in volatile or moisture-rich environments, ensuring seamless automation.
Fuel, Oil, and Lubricant Supply Line Monitoring
Safeguard essential fluid distribution by continuously monitoring supply lines for fuel, lubrication oil, and hydraulic fluids. The transmitter’s chemical compatibility with FKM seals ensures long-term reliability even when exposed to diverse hydrocarbons, preventing leaks and enabling proactive maintenance by detecting pressure anomalies early.
Marine Pump Pressure Oversight
Enhance the reliability of marine pumping systems used for water cooling, fire-fighting, or fluid transfer. By monitoring pump outlet pressures, the device enables real-time oversight of flow conditions, allowing operators to detect pump wear, blockages, or cavitation early and maintain optimal system pressure for critical fluid distribution loops.
Shipboard Elevator and Hydraulic Lifting System Control
Ensure the safety and smooth operation of onboard lifting equipment, such as elevators and hydraulic cranes, by providing precise pressure feedback. The device’s resilience to shock and vibration ensures consistent signal stability during the rapid pressure changes inherent in hydraulic lifting cycles, contributing to dependable system performance.
Liquid Storage and Hydrostatic Level Measurement
Utilize the DMP457 for accurate hydrostatic level measurement in fuel tanks, and liquid storage containers. Its high-precision sensing capabilities allow for reliable level monitoring, providing the accurate data needed for fuel inventory control, even when subjected to changing tank conditions.
Tank Contents Gauging Pneumatic Pressure Signal to 4-20mA conversion
Install pressure transmitters on an existing tank gauging system that uses pneumatic pressure signals to monitor the level of ballast or liquid cargo, so that a 4 to 20 milli-amp signal can be fed into a vessel performance monitoring system.
Product Specifying Guide
Select the nominal pressure range and mode
Determine the process operating pressure and select either a gauge (-1…0 bar up to 0…600 bar) or absolute (0.4…600 bar) pressure range. For low-pressure hydrostatic level or gas monitoring, ranges starting at 0…100 mbar are available. Ensure the maximum system peak pressures do not exceed the specified overpressure limits of the chosen range.
Choose the required accuracy class
Select the standard IEC 61298-2 accuracy rating of 0.35% FSO for general marine process control applications. If your application requires elevated measurement precision for critical test stands or fiscal monitoring, specify the optional 0.25% FSO accuracy class (available for nominal pressures ≥ 0.4 bar).
Select mechanical process connection and seal configuration
Match the process interface to your piping system using standard thread options such as G1/4″ DIN 3852, G1/2″ DIN 3852, 1/4″ NPT, or 1/2″ NPT. For viscous or contaminated media, select the flush G1/2″ DIN 3852 port (for pressures ≤ 40 bar). Choose FKM seals for general oil and water service, or specify a welded sensor port without O-rings for maximum chemical compatibility.
Determine electrical connection and housing material
Identify environmental conditions at the installation point to choose an appropriate electrical enclosure. Options include the standard ISO 4400 plug (IP65), cable gland (IP67), stainless steel field housing (IP67), or a vented TPE-U cable outlet (IP68) for immersion or high-humidity spaces. Select standard 316L stainless steel housing or CuNi10Fe1Mn for direct seawater exposure.
Confirm hazardous area and marine certification needs
Verify if the installation location requires explosion protection. If installed in Zone 0 or Zone 20 hazardous areas, specify the intrinsically safe DX19-DMP457 variant with ATEX/IECEx Ex ia approval. Finally, ensure the selected device configuration meets the specific marine society approval requirements (DNV, LR, ABS, BV, or CCS) applicable to the vessel classification.
Part Number Builder
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Part Number Configuration Examples
Examples of DMK 457 part numbers and associated product specification configuration descriptions.
600-V152-1-3-G10-300-1-000
- SKU ID: s1-dmp457-0002
- Part No: 600-V152-1-3-G10-300-1-000
- Pressure Range: -1 to 1.5
- Units: bar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4-20mA (2 wire)
- Accuracy: 0.35% FS
- Electrical Connection: DIN-43650 plug IP65 (for 4-6mm cable)
- Process Connection: G1/4 DIN3852
- Media Exposed Seals: FKM
600-1602-1-3-G10-300-1-000
- SKU ID: s1-dmp457-0001
- Part No: 600-1602-1-3-G10-300-1-000
- Pressure Range: 0 to 16
- Units: bar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4-20mA (2 wire)
- Accuracy: 0.35% FS
- Electrical Connection: DIN-43650 plug IP65 (for 4-6mm cable)
- Process Connection: G1/4 DIN3852
- Media Exposed Seals: FKM
601-D413-E-3-G01-100-1-000
- SKU ID: s1-dmp457-0006
- Part No: 601-D413-E-3-G01-100-1-000
- Pressure Range: 0.8 – 1.3 Bar Abs
- Output: 4 – 20mA / 2-wire
- Supply Voltage: 14 – 28V dc
- Electrical Connection: Male and female plug ISO 4400 (for cable 4.5-11mm)
- Male and female plug to ISO 4400
- Process Connection: G1/2″ DIN 3852
- Process Connection Material: Stainless Steel 1.4571 (316Ti)
- Seal Material: FKM
- Diaphragm Material: Stainless Steel 1.4435 (316L)
- Accuracy: 0.35% FS
- IP Rating: 65
- Combined Thermal Errors (TZS/TSS): 0.01% / FSO / °C
- Media Temperature: -25 to +125°C
- Operating Temperature: -20 to +60°C
- Special Options: None
- Approvals: Germanischer Lloyd (GL) and Det Norske Veritas (DNV)
- Approvals: ATEX (II 1 G Eex ia IIC T4)
601-B200-1-5-G00-300-1-000
- SKU ID: s1-dmp457-0007
- Part No: 601-B200-1-5-G00-300-1-000
- Pressure range: 800 to 1200 mbar abs
- Accuracy: 0.5% FS (std)
- Electrical Connection: DIN43650A plug IP65 (GL approved, for 10-14mm dia cable)
- Pressure Connection: G1/4 DIN3852
- Seals: FKM (standard)
601-D413-1-2-G10-100-1-000
- SKU ID: s1-dmp457-0004
- Part No: 601-D413-1-2-G10-100-1-000
- Pressure Range: 0.8 to 1.3
- Units: bar
- Range Type: Absolute (0 to +P)
- Output Signal: 4-20mA (2 wire)
- Accuracy: 0.25% FS
- Electrical Connection: DIN-43650 plug IP65 (for 4-6mm cable)
- Process Connection: G1/2 DIN3852
- Media Exposed Seals: FKM
Discontinued Part Number Replacements
List of older part numbers where a configuration option is no longer available, with the closest replacement part number and configuration description.
601-D290-1-3-TR1-F00-1-000 (3m)
- SKU ID: s1-dmp457-0003
- Part No: 601-D290-1-3-TR3-F00-1-000 (3m)
- Pressure Range: 0.8 to 1.8
- Units: bar
- Range Type: Absolute (0 to +P)
- Output Signal: 4-20mA (2 wire)
- Accuracy: 0.35% FS
- Electrical Connection: TPE-U cable IP68 (temporary immersion)
- Cable Length: 3
- Cable Length Units: Metres (m)
- Process Connection: G1/2 DIN3852 flush (40 bar max)
- Media Exposed Seals: FKM
601-D290-1-3-TR1-F00-1-000
- SKU ID: s1-dmp457-0005
- Part No: 601-D290-1-3-TR3-F00-1-000(5m)
- Pressure Range: 0.8 to 1.8 Bar Abs
- Output: 4 – 20mA / 2-wire
- Supply Voltage: 8 – 32 V dc
- Electrical Connection: 5m Vented TPE Cable
- Process Connection: G1/2″ male DIN 3852 with flush sensor
- Process Connection Material: Stainless Steel 1.4571 (316Ti)
- Seal Material: FKM
- Diaphragm Material: Stainless Steel 1.4435 (316L)
- Accuracy: 0.35% FS
- IP Rating: 68
- Combined Thermal Errors (TZS/TSS): 0.007% / FSO / °C
- Media Temperature: -25 to +125°C
- Operating Temperature: -25 to +80°C
- Special Options: None
- Approvals: Germanischer Lloyd (GL) and Det Norske Veritas (DNV)
Installation & Operation Guide
Safety pre-checks and mechanical mounting
Before installation, verify that the process media is chemically compatible with wetted materials (1.4404 / 1.4435 stainless steel and FKM seals) and that line pressure remains within datasheet limits. Mount the transmitter into the process connection without applying force directly to the housing; always use an appropriate spanner on the spanner flats. Apply recommended tightening torques based on connection size (e.g., approx. 5 Nm for G1/4″ DIN 3852, 10 Nm for G1/2″ DIN 3852, 30 Nm for 1/4″ NPT, or 70 Nm for 1/2″ NPT) and use proper sealing rings for parallel threads without adding hemp or Teflon tape on DIN 3852 ports.
Electrical wiring and cable connection
Ensure power supply circuits are isolated before connecting wiring. Connect the 2-wire cable according to the pin assignment diagram: for ISO 4400 plugs, connect Pin 1 to Supply+ (VS+) and Pin 2 to Supply- (VS-); for field housing or cable outlets, connect the white wire (WH) to VS+ and the brown wire (BN) to VS-. Always utilize a shielded, twisted multicore cable for power and signal transmission, ensuring the shield is properly grounded at the control cabinet side.
Vented cable outlet and ambient pressure reference
For transmitter versions equipped with an IP68 cable outlet, ensure the integrated capillary ventilation tube inside the TPE-U cable remains unblocked and clean. The atmospheric capillary tube must vent into a clean, dry junction box or non-condensing environment to maintain accurate gauge pressure measurement and prevent moisture ingress into the sensor electronics. Avoid severe bending or crushing of the cable assembly.
Commissioning and operational checks
Apply supply voltage (10…32 VDC for standard units or 12…28 VDC for Ex variants) and inspect for electrical or process fluid leaks. Confirm that zero-point current output reads 4 mA at ambient atmospheric pressure. Verify that output signal loops respond linearly to pressure changes without signal dropouts, spikes, or electromagnetic noise interference.
Maintenance, recalibration, and cleaning
Periodically inspect mechanical joints and electrical cable entries for wear, mechanical damage, or dust accumulation exceeding 5 mm. If zero point or span calibration shifts over extended service lifetimes, perform recalibration using calibrated reference pressure standards. When cleaning flush diaphragms, never use pointed mechanical tools or compressed air, as sharp contact will cause irreparable diaphragm deformation.
Product Help
Primary sensor technology of the DMP457
What primary sensor technology is used in the DMP457 pressure transmitter?
The DMP457 pressure transmitter utilizes a piezoresistive stainless steel sensor element equipped with a stainless steel 1.4435 (316L) diaphragm. This technology offers high measurement accuracy, superior long-term stability, and excellent resistance to mechanical shock and vibration in demanding marine environments.
Marine classification society approvals
Which marine classification societies have type-approved the DMP457 pressure transmitter?
The DMP457 pressure transmitter holds standard type-approval certificates from major international marine classification bodies including Det Norske Veritas (DNV), Lloyd’s Register (LR), American Bureau of Shipping (ABS), Bureau Veritas (BV), and China Classification Society (CCS). These approvals qualify the device for installation on ships, offshore structures, and marine power systems.
Intrinsic safety ratings for hazardous areas
Is the DMP457 pressure transmitter suitable for installation in explosive or hazardous environments?
Yes, the intrinsically safe variant (DX19-DMP457) is ATEX and IECEx certified for use in Zone 0 gas areas and Zone 20 dust areas. It carries explosion protection ratings of Ex ia IIB T4 Ga and Ex ia IIIC T135°C Da when powered via an approved intrinsically safe power supply barrier with maximum input parameters Ui = 28 V, Ii = 93 mA, and Pi = 660 mW.
Flush diaphragm option for dirty media
Can the DMP457 pressure transmitter be configured for viscous, pasty, or contaminated process media?
Yes, for viscous or contaminated media, the DMP457 can be specified with an optional flush G1/2″ DIN 3852 process connection for pressure ranges up to 40 bar. The flush diaphragm design prevents media accumulation and dead-space clogging, allowing easy access for maintenance and cleaning.
IP68 cable coating
What kind of cable coating is on the IP68 version of the DMP458?
The cable used is TPE coated.
Crease on isolation diaphragm
We have pressure tested a DMP457 pressure sensor with a flush diaphragm to 40 bar on water. After the test we noticed a small crease on the Stainless steel diaphragm. Is this something which can happen in normal use and will the crease have any effect on the performance of the sensor?
If it’s a shallow crease, for example less than the visible surface convolutions it should be ok, but you might notice a very slight offset. The DMP457 has an isolation diaphragm which is back-filled with oil so a reduction in volume will put slight pressure on the sensing element inside.
It’s not normal to see surface damage unless there has been cavitation, overpressure or physical damage during installation. It’s very easy to damage the isolation diaphragm with a point load, for example a screw driver or pencil will very easily dent the surface since it is only a few thou thick. In normal use when air or liquid pressure is applied, the load is distributed evenly across the diaphragm surface.
Related Documents
Specification data sheet
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