The DMK 457 is a marine-approved pressure transmitter featuring a high-performance ceramic sensor designed specifically for demanding applications in shipbuilding and offshore constructions.
Offering nominal pressure ranges from 0…400 mbar up to 0…600 bar and a standard 2-wire 4…20 mA output signal, this transmitter serves as a robust alternative to piezoresistive stainless steel alternatives. With vital maritime type approvals, including Lloyd’s Register, DNV, American Bureau of Shipping, and China Classification Society, and an optional sea-water-resistant copper-nickel alloy pressure port, the series delivers an accuracy of 0.5% FSO according to IEC 61298-2 for reliable long-term deployment in harsh marine environments.
Product Parameters
- Pressure Ranges: 0…400 mbar up to 0…600 bar gauge or absolute, liquid level options up to 600 mH2O
- Accuracy: 0.5% FSO IEC 61298-2 standard
- Output Signal: 4-20mA current loop output
- Electrical Connections: ISO 4400 plugs, compact field housings, cable outlets, or fully submersible
- Pressure Connections: 1/2, 1/4 inch BSP or NPT male including 1/2 BSP male open port
- Media Compatibility: Stainless steel 316L or CuNiFe housing, Ceramic diaphragm and FKM or FFKM (<100bar) O ring seals
- Temperature Range: Medium temperatures from -40 to 125°C and electronics environments from -40 to 85°C.
- Special Features: DNV, Lloyd’s Register, ABS, and CCS marine approvals
- Special Options: CuNi10Fe1Mn housing up to 400 bar for use on sea-water, ATEX and IECEx IS approval
Product Description
The DMK 457 marine approved pressure transmitter has a ceramic sensing diaphragm which is compatible with sea water and salt spray when the copper nickel alloy option is specified for ranges up to 100 bar. When paired with this specialized alloy, the transmitter becomes entirely sea-water resistant, preventing galvanic corrosion and biofouling when deployed in raw marine fluid systems.
Electrical integrity is preserved through several enclosure options, such as the IP68-rated TPE-U cable version featuring an integrated air tube for atmospheric reference, or an IP65 ISO 4400 plug configuration.
The DMK457 marine approved pressure transmitter is LR (Lloyd´s Register), GL (Germanischer Lloyd), DNV (Det Norske Veritas), ABS (American Bureau of Shipping) and CCS (China Classification Society) approved for marine use and can be used above and below deck on seawater systems.
ATEX and IECEx approved for intrinsically safe use in hazardous environments up to zones 0 (gas) and 20 (dust) 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).
Product Features
The DMK 457 series is engineered for high reliability in harsh maritime and industrial environments. It combines specialized material options with robust sensing technology to ensure consistent performance over the long term.
Maritime Classification Compliance
The DMK 457 carries extensive type approvals from leading international classification societies, such as DNV, Lloyd’s Register, American Bureau of Shipping (ABS), and the China Classification Society (CCS). These certifications provide assurance that the transmitter meets strict global standards for safety and operational continuity on marine vessels and offshore platforms.
Ceramic Sensor Robustness
At the heart of the unit is a high-purity 96% Aluminum Oxide (Al2O3) ceramic diaphragm. This design provides significant advantages over traditional stainless steel sensors, offering high overpressure protection and exceptional resistance to mechanical erosion. It maintains stability even when exposed to demanding pressures, ensuring accurate, long-term measurement.
Sea-Water Resistant Materials
For deployment in raw marine environments, the transmitter can be equipped with a specialized CuNi10Fe1Mn copper-nickel alloy pressure port. This material is specifically formulated to resist biofouling and galvanic corrosion, preventing degradation in saline or brackish water conditions often found in offshore and shipping infrastructure.
Intrinsically Safe Configuration
The device offers an optional intrinsically safe (Ex ia) version, certified for use in hazardous areas including zones 0 and 20. This allows for safe operation in environments where explosive gases or dust concentrations may be present, maintaining compliance with safety protocols in critical industrial zones.
Durable Cabling Solutions
To ensure operational longevity in challenging conditions, flame-resistant and halogen-free TPE-U cable options are available. These cables are designed to withstand exposure to harsh substances such as oil, gasoline, and salt water, maintaining seal integrity and preventing degradation in complex machinery environments.
Oxygen Application Readiness
The transmitter is available in a version specifically cleaned and configured for use in oxygen systems. This option adheres to strict safety standards, ensuring compatibility for working pressures up to 25 bar, making it a suitable choice for specialized gas handling and containment applications.
Vibration and Shock Resilience
Designed for the rigorous demands of marine machinery, the DMK 457 achieves high vibration stability ratings of up to 4 g, tested in accordance with DNV class B profiles. This ensures consistent signal accuracy and physical integrity, even when installed near active engines, compressors, or heavy industrial equipment.
Product Applications
The DMK 457 pressure transmitter is engineered for exceptional versatility, providing reliable and precise measurement data across a wide spectrum of demanding maritime and industrial applications. Its robust design, coupled with specialized material compatibility, allows it to perform consistently in everything from critical shipboard fluid management to harsh offshore environments.
Ballast Tank & Draught Monitoring
The DMK 457 is highly effective for critical level measurement within ballast tanks and ship draught monitoring systems. Its ability to provide continuous, accurate pressure data ensures that operators can maintain optimal trim and stability for vessels and transport ships, even in fluctuating or adverse sea conditions.
Reverse Osmosis
Measure the pressure of seawater on a reverse osmosis desalination plant which is used to convert salt water to fresh water.
- SKU ID: s1-dmk457-0010
- Part No: 590-1003-1-5-G10-100-1-K-2-000
- Pressure Range: 100
- Units: bar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4 – 20 mA, 2-wire
- Accuracy: 0.5% FS
- Electrical Connection: DIN-43650 plug IP65 (for 4-6mm cable)
- Process Connection: G1/2 DIN3852
- Housing & Process Connection Material: CuNi10Fe1Mn Seawater Compatible
- Diaphragm Material: Ceramic Al2O3
- Media Exposed Seals: FKM
Marine Boiler & Heat Exchanger Systems
In marine engineering, maintaining precise pressure control is vital for boiler systems and heat-exchanger feedback loops. This transmitter delivers the stable signal output required to manage steam production and cooling efficiency, ensuring operational safety and energy optimization in complex heat-management circuits.
Compressor & Engine Management
The device is specifically designed to withstand the rigorous vibration and mechanical stress common in engine rooms. It excels at tracking pressure for industrial compressors and engine drive machinery, providing the reliable feedback necessary for predictive maintenance and efficient power plant management.
Shipboard Pneumatic Controls
Reliable pneumatic control systems are the backbone of many ship architectures. The DMK 457 provides the steady, constant pressure input signals essential for these automated systems, ensuring responsive and accurate control over critical onboard machinery and actuators.
Seawater fire sprinkler
Monitor seawater pressure in an onboard fire sprinkler system.
- SKU ID: s1-dmk457-0006
- Part No: 590-1002-1-5-G10-100-1-K-2-000
- Pressure Range: 10
- Units: bar
- Range Type: Gauge (0 to +P)
- Output Signal: 4 – 20 mA, 2-wire
- Accuracy: 0.5% FS
- Electrical Connection: DIN-43650 plug IP65 (for 4-6mm cable)
- Process Connection: G1/2 DIN3852
- Housing & Process Connection Material: CuNi10Fe1Mn Seawater Compatible
- Diaphragm Material: Ceramic Al2O3
- Media Exposed Seals: FKM
Oil Storage & Pipeline Instrumentation
Managing the distribution of fuel oil, heavy oil, and lube oil requires instrumentation that is both durable and precise. This transmitter offers a dependable solution for monitoring storage tanks and distribution pipelines, helping to ensure fluid system integrity and preventing leaks or operational downtime.
Cooling Systems & Offshore Fluid Handling
Capable of handling raw seawater cooling systems, desalination plants, and offshore drilling fluid loops, the DMK 457 is built to resist corrosion and degradation. Its robust ceramic sensing element and optional alloy ports ensure long-term performance in some of the most challenging chemical and saline environments.
Oxygen & Clean-Room Systems
For specialized applications, the transmitter can be configured to meet strict clean-room requirements for oxygen gas lines and containment infrastructure. This version adheres to rigorous safety standards, providing the precision and high-level safety measures required for handling hazardous gas supplies safely.
Offshore wind turbine installation
Monitor pressures on the external side of a offshore wind turbine and withstand submersion in seawater or exposure to salt air & sea spray.
- SKU ID: s1-dmk457-0003
- Part No: 591-1002-1-5-TS0-100-1-K-2-000
- Pressure Range: 10
- Units: bar
- Range Type: Absolute (0 to +P)
- Output Signal: 4 – 20 mA, 2-wire
- Accuracy: 0.5% FS
- Electrical Connection: TPE cable IP68 (permanent immersion)
- Cable Length: 25
- Cable Length Units: metres (m)
- Process Connection: G1/2 DIN3852
- Housing & Process Connection Material: CuNi10Fe1Mn Seawater Compatible
- Diaphragm Material: Ceramic Al2O3
- Media Exposed Seals: FKM
Product Specifying Guide
Step 1: Define pressure type and engineering range
Determine whether your application requires gauge pressure (referenced to atmosphere) or absolute pressure (referenced to a vacuum). Select your range within the standard boundaries of 0…400 mbar up to 0…600 bar, or choose level-specific calibrations denoted in meters of water column (mH2O).
Step 2: Choose the optimal process connection material
Assess the chemical composition of the fluid media being measured; for standard fresh water, hydraulic fluids, and mild oils, choose the standard 1.4404 stainless steel option. For ballast tanks, brackish water, or open ocean offshore constructions, select the CuNi10Fe1Mn copper-nickel alloy to achieve full sea-water resistance.
Step 3: Select the appropriate mechanical connection interface
Match the transmitter to the existing piping framework by choosing from a variety of thread profiles. Available options include G1/2″ DIN 3852, G1/2″ EN 837, 1/2″ NPT, G1/4″ threads, or an open-port G1/2″ design ideal for viscous or crystallizing media lines where clogging is a risk.
Step 4: Finalize electrical hookup and environmental protection
Select an electrical termination style based on your system design and target IP rating. Options include standard or GL-approved ISO 4400 plugs for IP65 protection, an integrated field housing for clean wire terminations, or a permanent immersion TPE-U cable arrangement providing IP68 sealing up to 4 bar of submersion pressure.
Part Number Builder
Generate or decode DMK 457 ordering code
Configuration Rules & Restrictions
When configuring your DMK 457 Marine Approved Pressure Transmitter, please note the following manufacturing design constraints. The configurator above will automatically filter out invalid combinations based on these rules:
Pressure Type & Measurement Range:
- Absolute Pressure: Only available for measurement ranges of 0.6 bar / 6 mH2O and above. It is not possible to select Absolute pressure for the 0.4 bar or -1…0 bar ranges.
Pressure Port Material:
- Copper-nickel-alloy (CuNiFe):
- Restricted to a maximum measurement range of 400 bar / 4000 mH2O.
- Cannot be combined with NPT mechanical connections (1/2″ NPT or 1/4″ NPT).
- Cannot be combined with the Universal Field Housing (880) electrical connection.
Mechanical Connections:
- G1/2″ DIN 3852 Open Port: This specialized port is only available for pressure ranges up to 40 bar / 400 mH2O.
- NPT Threads: Must be combined with the Stainless Steel pressure port material.
Seals:
- FFKM Seals: Only available for measurement ranges up to 100 bar / 1000 mH2O.
Submersible Versions:
- If selecting a Submersible electrical connection, the pressure port material is strictly determined by the housing:
- TT3 (Submersible SS 316L): Must use the Stainless Steel pressure port.
- TS3 (Submersible CuNiFe): Must use the Copper-nickel-alloy pressure port.
Special Versions (Oxygen Application):
- Oxygen cleaned applications are restricted to pressure ranges up to 25 bar / 250 mH2O.
- Oxygen applications must use the standard FKM seal (FFKM seals are not permitted).
Custom Cable Lengths:
- Specifying a cable length in metres is only applicable when an electrical connection featuring a cable outlet is selected (TR3, TT3, or TS3).
- If left blank on a valid cable connection, the standard default length of 2 metres is assumed and if a custom length is specified it will be added as suffix to the final part number configuration.
Installation & Operation Guide
Step 1: Mounting position and orientation alignment
The pressure transmitter can be installed in any physical position or orientation without degrading calibration or structural performance. Ensure that the mechanical thread matches the process port completely to prevent cross-threading and avoid mechanical over-torquing during final seal compression.
Step 2: Electrical wiring and terminal connections
The instrument utilizes a standard 2-wire current loop system that shares supply power and signal output lines. Wire the positive supply side to the designated VS+ terminal and the negative loop return to the VS- terminal, making sure to utilize shielded cabling to shield against electromagnetic interference.
Step 3: Atmospheric reference protection
For configurations utilizing relative or gauge pressure scales, ensure the ventilation path remains completely unobstructed. If using a cable outlet type, do not crimp, bend sharply, or seal off the integrated air tube running through the center of the TPE-U cable jacket.
Step 4: Supply voltage validation
Before energizing the monitoring system, verify that the active loop voltage falls within safe operating parameters. Standard versions require a stable DC source between 8 … 32 VDC, whereas the intrinsically safe explosion-protected (Ex ia) models require a voltage between 10 … 28 VDC passed through an appropriate safety barrier.
Product Help
Open ocean seawater
Can this transmitter be used directly in open ocean seawater?
Yes, when specified with the copper-nickel alloy (CuNi10Fe1Mn) option for the pressure port and housing, the transmitter is completely sea-water resistant and specifically optimized for offshore constructions and ballast tank deployments.
Cable type use
What kind of cable should be used for connection?
Generally, shielded cable must be used across all variations, and the factory-supplied versions are built with heavy-duty TPE-U cabling that is flame-resistant, halogen-free, and resistant to sea water, salt, and fuel oils.
Oxygen lines
Can this device handle gaseous oxygen lines?
Yes, there is an optional specialized oxygen application version available for pressure ranges less than or equal to 25 bar.
Ballast tank external mounting options
I have a project which requires a pressure transducer for ballast tanks measuring 0…+0.5 bar, a minimum IP67 sealed cable 2 metres long, which will be mounted to outside of the tank. Also could you explain the difference between the temporary and permanent immersion cable, and the seawater compatible versions?
The version with TPE cable IP68 (temporary immersion) is fixed and not removable from the sensor. It is suitable for an environment which may get wet but is not intended for submersion for long periods, but it does have a higher waterproof rating than IP67.
The front part of the sensor can have a CuNi10Fe1Mn port for seawater compatibility. The back part of the sensor (external to the tank) is only available in stainless steel 316L for the temporary immersion IP68 version.
- SKU ID: s1-dmk457-0011
- Part No: 590-5000-1-5-TR3-100-1-K-2-000
- Pressure Range: 0 to +0.5 bar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4 – 20 mA, 2-wire
- Accuracy: 0.5% FS
- Electrical Connection: TPE cable IP68 stainless steel 316L housing (temporary immersion)
- Cable Length: 2
- Cable Length Units: metres (m)
- Housing Material: Stainless steel 316L
- Process Connection Material: CuNi10Fe1Mn Seawater Compatible (G threads
- only)
- Process Connection: G1/2 DIN3852
Diaphragm Material: Ceramic Al2O3 - Media Exposed Seals: FKM
If the area around the tank is likely to be flooded and exposed to seawater, there is a permanently submersible version, which can also be fully CuNi10Fe1Mn backend/frontend for seawater compatibility internally and externally to the tank.
- SKU ID: s1-dmk457-0012
- Part No: 590-5000-1-5-TS3-100-1-K-2-000
- Pressure Range: 0 to +0.5 bar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4 – 20 mA, 2-wire
- Accuracy: 0.5% FS
- Electrical Connection: TPE cable IP68 seawater compatible housing (permanent immersion)
- Cable Length: 2
- Cable Length Units: metres (m)
- Housing Material: CuNi10Fe1Mn Seawater Compatible
- Process Connection Material: CuNi10Fe1Mn Seawater Compatible (G threads
- only)
- Process Connection: G1/2 DIN3852
Diaphragm Material: Ceramic Al2O3 - Media Exposed Seals: FKM
FKM seal in seawater
Are the fluoroelastomer FKM seals resistant to seawater?
Yes the option for FKM seals used in the construction of the DMK457 are compatible with seawater.
TS0 vs TT0 cable gland options
What is the difference between the TR0 and TS0 submersible options?
TR0 is a IP68 rated cable gland but it is not intended for deep permanent submersible applications, but more for cleaning & flood protection.
The TS0 is a more robust IP68 cable gland suitable for continuous submersible applications to a depth of 250 metres.
Vibration
Can the DMK457 withstand vibration?
Yes the DMK457 is designed to withstand 4g level of vibration as part of the marine approval according to GL: curve 2, according to DNV: Class B and basis: IEC 60068-2-6.
Fire, bilge & ballast suction and pressure
I’m looking for a 4-20 mA sea water suction & pressure transducer for measuring -1 to 4 bar on fire, bilge and ballast pumps on a sea vessel?
The BD Sensor DMK 457 can be specified for seawater compatibility if configured with the optional CuNi10Fe1Mn housing & process connector. It is also possible to scale the DMK 457 as a compound range with 4mA output at -1 bar and 20mA output at +4 bar.
- SKU ID: s1-dmk457-0007
- Pressure Range: -1 to 4
- Units: bar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4 – 20 mA, 2-wire
- Accuracy: 0.5% FS
- Electrical Connection: DIN-43650 plug IP65 (for 4-6mm cable)
- Process Connection: G1/2 DIN3852
- Housing & Process Connection Material: CuNi10Fe1Mn Seawater Compatible (400 bar max. range, G threads
- only)
- Diaphragm Material: Ceramic Al2O3
- Media Exposed Seals: FKM
Seawater cooling system on exhaust gas cleaning system
We have a exhaust gas cleaning system, and require a pressure transmitter for the cooling system which has seawater going through it. The range is 0-10 bar, output 4-20mA, and we will need the pressure transmitter to be DNV certified.
The DMK457 is seawater compatible if specified with the Copper Nickel alloy pressure port. As standard the DMK457 is DNV marine approved for use on ship systems.
- SKU ID: s1-dmk457-0005
- Part No: 590-1002-1-5-G00-100-1-K-2-000
- Pressure Range: 0 – 10 Bar G
- Output: 4 – 20mA / 2-wire Supply Voltage: 12 – 36V dc
- Electrical Connection: GL Male and female plug to ISO 4400
- Process Connection: G1/2″ male DIN 3852
- Process Connection Material: Copper-Nickel alloy (CuNi10Fe1Mn)
- Seal Material: FKM
- Diaphragm Material: Aluminium Oxide
- Accuracy (NL&H): <±0.25% / Span (BFSL)
- IP Rating: 65
- Combined Thermal Errors (TZS & TSS): < ±0.02% / FSO / °C
- Media Temperature: -25 to +135°C
- Operating Temperature: -25 to +80°C
- Special Options: None
- Approvals: Germanischer Lloyd (GL) & Det Norske Veritas (DNV)
IP68 cable coating
What kind of cable coating is on the IP68 version of the DMK458?
The cable used is TPE coated.
Difference between TTO and TRO IP68 cable gland
The DMK457 marine approved pressure transmitter has two types of IP68 rated cable gland TRO and TTO? what is the difference between these two types?
The TRO version is designed for temporary submersion to protect from flooding or wash down and has been test to 4 bar over 24 hours.
The TT0 version is designed for permanent submersion and is suitable to install in depths down to at least 250 mH2O ~ 25 bar.
Dredger suction monitoring
We are looking for a pressure sensor for dredger suction monitoring. It will be mounted on a 50mm branch pipe off the main dredge suction pipe. The sensor will be subject to vibration and there will be sand and gravel in the dredge pipe?
The DMK 457 has the option to measure suction pressure with a 0 to minus 1 bar gauge, and a open pressure port design to prevent clogging whilst protecting the diaphragm from direct abrasion due perpendicular flow.
- SKU ID: s1-dmk457-0001
- Part No: 590-Z102-1-5-G10-100-1-1-2-000
- Pressure Datum: Gauge, in bar
- Pressure Range: 0 to -1 bar
- Output: 4 – 20mA / 2-wire
- Accuracy: <±0.25% / FS (BFSL)
- Electrical Connection: Large Plug & Socket (ISO 4400) for cable dia 4-6mm
- Process Connection: G 1/2″ male DIN 3852 open pressure port
- Seal Material: FKM
- Process Connection Material: Stainless Steel 1.4404 (316L)
- Diaphragm Material: Ceramic Al2O3, 96%
- Special Options: Standard
- Supply Voltage: 8 – 32 V dc
- Process Connection Material: Stainless Steel 1.4404 (316L)
- Diaphragm Material: Aluminium Oxide 96% (Ceramic Al2O3)
- IP Rating: 65
- Media Temperature: -40 to +125°C
- Operating Temperature: -40 to +85°C
- Approvals: Germanischer Lloyd (GL) & Det Norske Veritas (DNV)
Mooring connection depth
We have a mooring connection that is underwater all the time. We want to know the position of this mooring connection within the range it moves vertically from the sea bed to the surface where it connects. The depth we will be working in is 50 metres and the idea is to install this sensor somewhere on the mooring connection to measure this. The sensor body will be located inside the mooring connection in a dry environment, just the sensing part will be exposed to seawater all the time. What would be a suitable spec for us to use?
The DMK 457 can be manufactured so that the whole construction is compatible with seawater, so it will be protected from seawater on the inside and the outside of the mooring connection, which maybe useful if there is a risk of seawater leaks or flooding.
- SKU ID: s1-dmk457-0002
- Part No: 592-5001-1-5-TS0-H00-1-K-2-000
- Pressure Range: 0 to 50
- Units: mH2O
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4 – 20 mA, 2-wire
- Accuracy: 0.5% FS
- Electrical Connection: TPE cable IP68 (permanent immersion)
- Cable Length: 2
- Cable Length Units: metres (m)
- Process Connection: G1/2 DIN3852 open port (40 bar max)
- Housing & Process Connection Material: CuNi10Fe1Mn Seawater Compatible (400 bar max. range, G threads only)
- Diaphragm Material: Ceramic Al2O3
- Media Exposed Seals: FKM
Sea water pressure 0-4 bar
I am looking to specify a sensor with a 0-4bar pressure range, which is DNV or Lloyd approved, that is suitable for use on sea water.
The DMK457 is DNV/GL approved, and is compatible with seawater if CuNi10Fe1Mn is selected as the process connection material.
- SKU ID: s1-dmk457-0004
- Part No: 590-4001-1-5-G10-100-1-K-2-000
- Pressure Range: 0 to 4
- Units: bar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4 – 20 mA, 2-wire
- Accuracy: 0.5% FS
- Electrical Connection: DIN-43650 plug IP65 (for 4-6mm cable)
- Process Connection: G1/2 DIN3852
- Housing & Process Connection Material: CuNi10Fe1Mn Seawater
- Compatible (400 bar max. range, G threads only)
- Diaphragm Material: Ceramic Al2O3
- Media Exposed Seals: FKM
Related Documents
Specification data sheet
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