DMK457 Marine Approved Pressure Transmitter

Marine approved pressure transmitter with 4-20mA current loop output for shipbuilding with optional CuNiFe housing for sea-water compatibility in ranges from -1 to 600 bar gauge or absolute.

Product Parameters

Pressure Ranges: 0.4 up to 600 bar gauge or absolute
Accuracy: 0.25% full scale BSL NLHR
Output Signal: 4-20mA current
Electrical Connections: DIN plug, field housing and cable glands with IP68 environmental protection
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 NBR O ring seals
Special Features: DNV & GL 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.

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 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 Applications

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

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

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 Help

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

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