Sanitary pressure sensor with exposed diaphragm with no crevices for high temperatures up to 300 Degrees Celsius in ranges from 100mb up to 40 bar gauge or absolute.
The DMP 331P hygienic flush pressure transmitter has a selection of hygienic flush diaphragms for food & drink pressure or level measurement applications.
The DMP 331 P high temp hygienic pressure transmitter is ATEX/IECEx approved for intrinsic safety, and with the sanitary flush diaphragm it is suitable for pharmaceutical & biotechnology applications.
Product Parameters
- Pressure Ranges: 0.1 bar to 40 bar gauge, 400 mb to 40 bar absolute, along with vacuum ranges down to -1…0 bar.
- Accuracy: 0.35% full scale > 0.4 bar (0.5% <= 0.4 bar), optional improved accuracy 0.25% FS, IEC60770
- Output Signals: 4-20mA current loop, 3 wire 0-20mA current or 0-10V amplified voltage, optional ATEX/IECEx and SIL2
- Electrical Connections: DIN plug, IP67 cable gland, M12x1, field housing or Binder connector
- Pressure Connections: Triclover clamp, dairy, Varivent and BSP screw-in threads
- Media Compatibility: Stainless steel 1.4435 (316L) flush diaphragm with Ra < 0.15 µm, with optional Hastelloy C-276 or Tantalum diaphragms and FDA-approved filling fluids.
- Temperature Capability: Medium temperatures from -40…125 °C standard, CIP/SIP up to 150 °C for 60 minutes, high-temperature seals up to 260 °C, and integrated cooling element up to 300 °C.
- Special Options: Cooling element, food compatible oil fill, ATEX and IECEx approved for intrinsic safety (Zone 0/20 Ex ia), Hastelloy C276 or Tantalum wetted parts, SIL 2 functional safety rating, 3-A Sanitary approval, EHEDG Type EL Class 1 certified for hygienic equipment design
Product Description
The DMP331P pressure transmitter provides high-precision pressure measurement tailored specifically for sterile and hygienic process monitoring. Featuring a flush-welded stainless steel 1.4435 (316L) diaphragm, the sensor eliminates crevices, dead spaces, and recessed pockets where media or contaminants could gather. The diaphragm surface is ground to an exceptionally smooth finish of Ra < 0.15 µm, ensuring full compatibility with CIP and SIP cleaning routines up to 150 °C without requiring sensor removal. For aggressive or corrosive process fluids, alternative diaphragm construction materials including Hastelloy C-276 and Tantalum are available. Internal hydraulic filling fluids include standard silicone oil or optional FDA-compliant food-grade oil (21CFR178.3570) to prevent process contamination in food, beverage, and pharmaceutical applications.
The DMP331P is a precision industrial pressure transmitter engineered for demanding hygienic and process applications in the food, beverage, and pharmaceutical industries. Designed with a flush welded stainless steel 1.4435 (316L) diaphragm boasting a surface roughness of Ra < 0.15 µm, it prevents medium accumulation and enables efficient Clean-in-Place (CIP) and Sterilize-in-Place (SIP) thermal cycles up to 150 °C. The transmitter covers nominal pressure ranges from 0…100 mbar up to 0…40 bar in gauge and absolute pressure configurations, delivering standard accuracy of 0.35% FSO with an optional high-accuracy version of 0.25% FSO according to IEC 61298-2. It offers output signal choices including 2-wire 4…20 mA, 3-wire 0…10 V and 0-20 mA, with optional intrinsic safety approvals (Ex ia) for explosive environments, SIL 2 functional safety compliance according to IEC 61508/IEC 61511, and integrated cooling elements capable of handling media temperatures up to 300 °C.
High temperature media
The very high process media temperature tolerance is achieved by integrating a cooling element between the isolating flush membrane and the silicon strain gauge sensing element.
As long as the ambient temperature is significantly lower than the media temperature, the cooling element will dissipate high temperatures and reduce the temperature being conducted from the isolation diaphragm to a level that is within the operating temperature range of the pressure sensor electronics.
It is common practice to stand off a pressure sensor with a long piece of dead ended pipe to reduce the temperature at the sensor, but this can reduce the dynamic response of the pressure measurement and add unwanted volume to the system which can upset the performance of a test or a process.
By using a flush isolation diaphragm with a cooling element it is possible to measure high temp media pressures without introducing any extra volume to the system or damping the response of the pressure reading.
Hygienic fittings
Mechanically, the transmitter accommodates a broad spectrum of industry-standard hygienic process connections, including 3-A compliant Tri-Clamp fittings (3/4″, 1″, 1 1/2″, 2″), DIN 11851 Dairy Pipe couplings (DN25, DN40, DN50), Varivent adapters, and G1/2″ or G1″ flush-threaded ports. Thermal management options allow operation across extreme temperature spans; while standard versions operate continuously up to 125 °C, integrating an optional cooling element extends media temperature resistance up to 300 °C. Advanced seal options, such as FFKM elastomeric gaskets, provide reliable fluid containment for media temperatures up to 260 °C.
For sanitary food and biotech installations a food grade oil fill can be specified to protect the product being processed or stored in case the open diaphragm is accidentally damaged causing it to leak the fill fluid into the system.
Pressure ranges
The DMP331P high temperature pressure sensor can measure ranges from 100 millibar up to 40 bar with an accuracy of 0.175% full scale (0.25% for <0.4 bar) best straight line which includes non-linearity, hysteresis and repeatability errors.
Output signal
The pressure transmitter’s electronics provide a 4 to 20 milliamp current or 0-10 volt output signal. There is an ATEX approved version for intrinsic safety to allow use in a hazardous area with an appropriate IS zone barrier, and a SIL2 approved electronics version for applications requiring high electronic reliability.
Electrical connections
There are many electrical connections to choose from including an IP68 cable gland for external wash down cleaning of the sensor and the popular DIN43650A plug & socket with an IP65 protection rating.
Product Features
- Hygienic Flush Diaphragm: Smooth surface finish of Ra < 0.15 µm eliminates dead space, preventing media entrapment and bacterial accumulation.
- High Thermal Resistance: Withstands CIP/SIP thermal cycles up to 150 °C for 60 minutes and continuous media temperatures up to 300 °C with an optional cooling element.
- Certified Hygienic Design: Meets stringent sanitary criteria with official EHEDG EL Class I certificate and 3-A Sanitary Standard 74-07 compliance.
- Functional Safety & Explosion Protection: Optional SIL 2 qualification per IEC 61508/IEC 61511 and ATEX/IECEx Zone 0/20 (Ex ia) intrinsic safety ratings for hazardous areas.
- Versatile Modular Construction: Configurable with multiple wetted materials (316L, Hastelloy C-276, Tantalum) and filling fluids, including FDA-listed H1 food-grade oil.
Product Applications
Food and Beverage Processing
The DMP331P is extensively utilized for reliable pressure monitoring across various stages of food and beverage production. It is well-suited for dairy lines, where hygiene is paramount, as well as in brewhouses, beverage bottling systems, and sauce preparation vessels. Its robust design ensures consistent performance even in challenging sanitary environments.
Pharmaceutical & Biotechnology Manufacturing
In pharmaceutical and biotechnology facilities, this transmitter provides precise process pressure control critical for maintaining quality and safety standards. It is ideal for monitoring bioreactors, fermentation tanks, and various dosage systems. Furthermore, its compatibility with CIP/SIP sanitization loops ensures that the transmitter can withstand the rigorous cleaning cycles required in these sensitive production areas.
Chocolate strainer condition monitoring
Measure chocolate pressure on a process line up to 100 psi to switch a chocolate pump when the strainer is full and clogged with nuts.
- SKU ID: s1-dmp331p-24-31666
- Pressure Range: 0 to 100
- Units: psi
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4-20mA (2 wire)
- Accuracy: 0.35% 0.4bar range min, 0.5% below
- Electrical Connection: DIN43650A plug IP65
- Process Connection: Clamp 1″ DN25 (DIN 32676), 3A
- Process Connector Material: Stainless steel 316L
- Diaphragm Material: Stainless Steel 316L
- Media & Temperature: 125degC max
Chemical & Petrochemical Processing
Designed to handle demanding industrial tasks, the DMP331P effectively manages level and line pressure measurement in chemical and petrochemical applications. To ensure longevity and reliability, it supports the use of specialized, corrosion-resistant diaphragms like Hastelloy C-276 or Tantalum, allowing it to operate safely when measuring aggressive process media.
CHP plant boiler steam header
Measure the pressure of CHP plant steam header at 220°C.
- SKU ID: s1-dmp331p-0009
- Part No: 500-1502-1-3-100-Z00-1-7-1-200
- Pressure Range: 15
- Units: bar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4-20mA (2 wire)
- Accuracy: 0.35%
- Electrical Connection: DIN43650A plug IP65
- Process Connection: G1/2 Flush DIN3852, 1bar range min
- Process Connector Material: Stainless steel 316L
- Diaphragm Material: Stainless Steel 316L
- Media & Temperature: 260degC max, FFKM seal
Dosing & Filling Systems
The transmitter excels in rapid pressure detection applications, such as those found in hygienic dosing pumps, high-speed liquid packaging, and advanced filling machinery. Its fast response time and stable output make it a dependable component for ensuring precision in high-throughput production lines where speed and accuracy are essential.
Ice-cream level
Measure the level of ice-cream in a stainless steel vat.
- SKU ID: s1-dmp331p-0002
- Part No: 500-2000-3-5-850-M73-1-0-2-000
- Pressure Range: 0 to 2
- Units: mH2O
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 0-10V (3 wire)
- Electrical Connection: Field housing IP67
- Process Connection: Dairy pipe DN25
- Process Connector Material: Stainless steel 316L
- Diaphragm Material: Stainless Steel 316L
- Media & Temperature: Food grade, 125degC max
Vacuum Process Technology
For applications involving vacuum process technology, the DMP331P offers accurate monitoring of negative gauge pressure and absolute pressure. It is perfectly suited for use in complex evacuation processes and vacuum pans, providing the precise measurements needed to control and optimize vacuum-based industrial operations.
Liquid Asphalt pressure
Measure the pressure in liquid Asphalt plumbing systems.
- SKU ID: s1-dmp331p-0008
- Pressure Range: 150
- Units: psi
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 0-10V (3 wire)
- Accuracy: 0.35% 0.4bar range min, 0.5% below
- Electrical Connection: M12 x 1 connector (4 pin)
- Process Connection: G3/4 Flush DIN3852
- Process Connector Material: Stainless steel 316L
- Diaphragm Material: Stainless Steel 316L
- Media & Temperature: 200degC (Vac 150degC) max, FKM seal
High-Temperature Process Lines
Equipped with an optional integrated cooling element, the transmitter is capable of sensing pressure in high-temperature environments. This makes it an excellent choice for steam lines, hot oil loops, and high-temperature heat exchangers, as the cooling fins effectively protect the electronics from heat damage while maintaining measurement accuracy.
Product Specifying Guide
Step 1: Define pressure type and nominal range
Select whether the system requires gauge pressure (referenced to atmosphere), absolute pressure (referenced to total vacuum), or negative gauge/vacuum measurement. Choose a nominal full-scale range between 0…100 mbar and 0…40 bar, ensuring process operational pressures and expected pressure spikes fall within the sensor overpressure limits.
Step 2: Choose measurement accuracy level
Evaluate process control tolerances to select between the standard measurement accuracy of 0.35% FSO and the optional high-accuracy version of 0.25% FSO according to IEC 61298-2. Note that for low nominal pressure ranges below 0.4 bar, standard accuracy is rated at 0.50% FSO.
Step 3: Select the process connection and seal material
Determine the mechanical process connection compatible with existing pipework or vessel ports, such as Tri-Clamp (3/4″, 1″, 1 1/2″, 2″), Dairy Pipe (DN25, DN40, DN50), Varivent, or flush thread G1/2″ / G1″. For threaded connections, select FKM elastomeric seals for temperatures up to 200 °C or FFKM seals for temperatures up to 260 °C. Clamp, dairy pipe, and Varivent process connections do not require internal transmitter seals.
Step 4: Specify diaphragm material and internal filling fluid
Select stainless steel 1.4435 (316L) as the standard diaphragm material, or opt for Hastelloy C-276 or Tantalum if measuring aggressive or highly corrosive media. Choose FDA-compliant H1 food-grade oil (21CFR178.3570) for sanitary food, beverage, or pharmaceutical installations, or standard silicone oil for general industrial processes.
Step 5: Assess operating temperature and cooling options
Verify maximum process temperatures during normal operation and cleaning cycles. If media temperatures continuously exceed 125 °C or reach up to 300 °C, specify an optional integrated cooling element to thermally isolate the transmitter electronics from process heat.
Step 6: Select output signal and safety approvals
Choose the required electrical output signal: 2-wire 4…20 mA current loop, 3-wire 0-20 mA or 0…10 V voltage output. For hazardous locations requiring explosion protection, specify the intrinsically safe Ex ia version (DX19-DMP 331P). For safety-critical loops, specify the factory SIL 2 configuration compliant with IEC 61508/IEC 61511.
Step 7: Select electrical connection and ingress enclosure
Choose the electrical connector matching field wiring requirements, such as ISO 4400 plug (IP65), M12x1 4-pin metal connector (IP67), Binder 723 5-pin plug (IP67), IP67/IP68 cable outlets with vented cables, or a stainless steel compact field housing.
Part Number Builder
Generate or decode DMP 331P ordering code & request quote
Installation & Operation Guide
Step 1: Inspect and prepare the mounting point
Before mounting, verify that system pipework or vessel ports are completely depressurized, de-energized, and free of debris. Keep protective caps over the flush diaphragm until immediately before installation to avoid scratching or damaging the delicate sensor surface. Inspect wetted materials and gaskets to ensure fluid compatibility with the process media.
Step 2: Mount the transmitter mechanically
For hygienic and 3-A sanitary compliance, install the transmitter in a self-draining orientation (permissible installation position 273°…87°) with welding sockets mounted flush inside vessel walls. For EHEDG applications, ensure flush mounting or maintain an upstand ratio of L/D < 1 when installing in T-pieces. Hand-tighten threaded fittings or position clamp collars carefully before applying specified tightening torques using an open-end wrench on the designated spanner flats; never apply torque to the transmitter housing itself.
Step 3: Establish electrical connections
Wire the device according to the corresponding pin configuration diagram for 2-wire current or 3-wire voltage systems. For 2-wire 4…20 mA current loops, connect positive supply to VS+ and negative supply to VS-. Ensure cable diameters fit within the specified clamping range of the cable gland (e.g., Ø 4…6 mm for ISO 4400 or Ø 2…8 mm for field housing) to guarantee IP ingress protection, and verify proper cable grounding.
Step 4: Verify intrinsically safe and functional safety installations
When operating intrinsically safe variants (DX19-DMP 331P) in Zone 0 or Zone 20 environments, ensure power is supplied via certified intrinsically safe barriers matching safety parameters (Ui = 28 V, Ii = 93 mA, Pi = 660 mW). For SIL 2 safety instrumented loops, review the accompanying safety data sheet and verify total loop fault metrics prior to commissioning.
Step 5: Perform zero-point check and initial commissioning
Apply supply voltage and allow electronics to stabilize. Check the zero-point signal under unpressurized atmospheric conditions. For adjustable variants, fine-tuning of offset and span within datasheet limits can be performed using compatible programming interfaces. Verify that gauge reference vents in cable or connector housings remain clear of dirt, water, or obstruction.
Step 6: Execute CIP/SIP maintenance and cleaning
Clean the transmitter housing externally with a damp cloth and mild cleaning agent when necessary. The flush diaphragm is designed for Clean-in-Place (CIP) liquids up to 150 °C without dismantling the unit from process lines. Never use sharp tools, pointed objects, or compressed air directly against the diaphragm surface to remove deposits.
Product Help
Diaphragm surface roughness and hygienic cleaning
What is the surface roughness of the DMP331P flush diaphragm, and can it be cleaned in place?
The flush diaphragm features a surface roughness of Ra < 0.15 µm, while the weld seam is finished to Ra < 0.8 µm. This ultra-smooth surface finish prevents media accumulation and bacteria adhesion, enabling full Clean-in-Place (CIP) and Sterilize-in-Place (SIP) cleaning with liquids up to 150 °C for 60 minutes without dismantling the transmitter from the process line.
High temperature process handling with cooling elements
How does the DMP331P handle continuous process temperatures above 125 °C?
While the standard transmitter operates continuously up to 125 °C, an optional cooling element can be integrated into the process connection assembly. This cooling fin structure thermally decouples the transmitter electronics from process heat, permitting continuous operation with media temperatures reaching up to 300 °C.
Functional safety and SIL certification
Is the DMP331P suitable for safety-instrumented systems requiring SIL compliance?
Yes, the transmitter is available in a factory SIL 2 configuration certified according to IEC 61508 and IEC 61511. In low demand safety functions, it delivers an undetected dangerous failure rate (DU) of 85 FIT, achieving SIL 2 capability with Hardware Fault Tolerance HFT=0, or SIL 3 capability in redundant HFT=1 architectures.
Hazardous area zone classification and intrinsic safety
What explosion protection ratings are available for hazardous plant environments?
The intrinsically safe variant (DX19-DMP 331P) is certified under ATEX and IECEx for Zone 0 (II 1G Ex ia IIC T4 Ga) and Zone 20 (II 1D Ex ia IIIC T135 °C Da). This permits safe installation in gas or dust hazardous atmospheres when powered through suitable intrinsically safe isolation barriers.
Filling fluid options for food and pharmaceutical processes
What internal filling fluids are available to ensure process safety in food applications?
In addition to standard silicone oil, the transmitter can be specified with an optional food-grade filling fluid compliant with FDA regulation 21CFR178.3570 (NSF H1 registered). This ensures full safety and product integrity in the event of accidental diaphragm rupture within food, beverage, or pharmaceutical manufacturing systems.
Maintaining room temperature acuracy at 180ºC
Is it possible to maintain the stated accuracy of 0.35% FS at +180C?
The accuracy stated below is for room temperature, there is also an additional error to consider when measuring over a dynamic range of temperatures, however if the high temperature temperature is stable it should be possible to achieve close to the room temperature performance by allowing for the changes in zero and span output settings at 180 degC.
The ambient temperature can also play a part in the accuracy since that will affect the temperature gradient along the cooling element, and therefore the temperature of the sensing element. If ambient temperature is fairly stable, then the accuracy of 0.35% should still be achievable at 180degC.
Voltage output response time
What is the response of the voltage output on this sensor?
The response time for the 3 wire 0-10Vdc output is < 3msec.
Ranges below 60 bar no longer available for DMK331P
In the past we have purchased the DMK331P 505-1002-1-5-100-Z00-1-1-1-150, but we are now told that this part number is no longer available. Is there an alternative part number that is equivalent to this specification?
The DMK331P which used to have ranges as low as 0 to 1 bar has been replaced by the DMP331P for pressure ranges below 60 bar. The equivalent part number is as follows:
- SKU ID: s1-dmp331p-0010
- Part No: 500-1002-1-3-100-Z00-1-1-1-200
- Pressure Range: 10 bar g
- Output Signal: 4-20mA (2 wire)
- Accuracy: 0.35% FS IEC60770
- Electrical Connection: DIN43650A plug IP65
- Media Operating Temp Range: -40 to +200°C
- Ambient Temperature Range: -40 to +85°C
- Pressure Connection: G1/2 Flush DIN3852
- Diaphragm Material: Stainless Steel 316L
- Media Compatibility: SS316L and FKM seal
Accuracy over temperature
How accurate is this sensor over temperature?
The compensated temperature range is 0 to 50 degC for the sensing element and the tolerance over that range is < +/- 1.5% FS.
Highest allowed temperature
What is the highest temperature that this sensor can be used on?
In the standard configuration the maximum media temperature is 125°C/257°F and the maximum ambient environment temperature for the electronics is 85°C/185°F. The cooling element option will increase the maximum media temperature as follows:
- 150°C/302°F – Vacuum ranges and pressure ranges up to 1 bar absolute
- 200°C/392°F – Fitted with FKM seals
- 250°C/482°F – Food grade oil fill with FFKM seals
- 300°C/572°F – Silicone oil fill with FFKM seals
Silicon heat transfer fluid
Will this DMP 331P pressure transducer work at 250C with a silicon heat transfer fluid at and below pressures of 5 bar?
Yes you can use the DMP 331P on viscous media up to 260°C if supplied with the integrated cooler which dissipates the heat away before it reaches the electronic part of the sensor.
- SKU ID: s1-dmp331p-0007
- Part No: 500-5001-1-2-100-Z00-1-7-1-200
- Pressure Range: 5
- Units: bar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4-20mA (2 wire)
- Accuracy: 0.35% 0.4bar range min, 0.5% below
- Electrical Connection: DIN43650A plug IP65
- Process Connection: G1/2 Flush DIN3852, 1bar range min
- Process Connector Material: Stainless steel 316L
- Diaphragm Material: Stainless Steel 316L
- Media & Temperature: 260degC (Vac 150degC) max, FFKM seal
Dairy chiller tank
We need to measure volume of contents of a chiller in a Dairy, a widely used technique is to measure hydrostatic pressure and convert the reading to a volume measurement. The pressure will be in the range of 100 mbar. As our commodity is classed as food grade, the sensor should be food grade rated and the measurement range should be in order of mbars.
We would suggest a DMP 331p with a food grade oil filled diaphragm seal, and a 1 inch clamp style process connection to meet the Dairy hygienic requirements, and a IP68 cable gland to protect the inside of the sensor when cleaning the outside of the chiller tank.
- SKU ID: s1-dmp331p-0006
- Part No: 500-1000-1-5-TR0-C61-0-2-000
- Pressure Range: 100
- Units: mbar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4-20mA (2 wire)
- Accuracy: 0.35% 0.4bar range & above, 0.5% below
- Electrical Connection: IP68 (temp immersion) seal with 2m of cable
- Process Connection: Clamp 1″ DN25 (DIN 32676), 3A
- Process Connector Material: Stainless steel 316L
- Diaphragm Material: Stainless Steel 316L
- Media & Temperature: Food grade, 125degC max
Heated process oil tank level 50ft high
We need a liquid level sensor for installing externally to a tank to measure the quantity of heated process oil in a vertical storage tank 50 feet high.
The DMP311P with an integrated cooling element will allow you to measure the level of process oil up to temperatures of 200 degC if using an FKM seal on the process fitting.
- SKU ID: s1-dmp331p-0004
- Pressure Range: 0 to 50
- Units: ftH2O
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4-20mA (2 wire)
- Electrical Connection: IP67 seal with 2m of cable
- Process Connection: G1/2 Flush DIN3852, P>=1bar only
- Process Connector Material: Stainless steel 316L
- Diaphragm Material: Stainless Steel 316L
- Media & Temperature: 200degC, Vac < 150degC, FKM seal
Compensated & media temperature range
For the option where the media temperature is rated to 200°C, does this refer to the compensated temperature range?
There is a cooling element between the media and sensor so the compensated temperature range is much lower. 200°C refers to the media temperature upper limit. The cooling element works by dissipating heat into the surrounding ambient temperature air.
The compensated temperature range is -20 to +85°C, with the integrated cooling element, the pressure sensing element should not see higher than 85°C.
3/4″ Tri-Clamp & 121°C Autoclave
I would like a autoclave pressure sensor which would resistant to 121°C degrees for 30 minutes and working in a 0-3 bar range. The pressure sensor should have a 3/4″ TC connection.
As standard the DMP 331 P can be used on media temperatures up to 125 degrees Celsius, and a 3/4 inch TriClamp (TC) connection is also possible as specified below.
- SKU ID: s1-dmp331p-0003
- Part No: 500-3001-1-3-100-C69-1-0-1-000
- Pressure Range: 3
- Units: bar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4-20mA (2 wire)
- Electrical Connection: DIN43650A plug IP65
- Process Connection: TriClamp 3/4″
- Process Connector Material: Stainless steel 316L
- Diaphragm Material: Stainless Steel 316L
- Media & Temperature: 125degC max
NPT threads with flush diaphragms
Do you offer any other threading options such as NPT for the DMP331P flush diaphragm pressure transmitter?
No the DMP331P is not available with a tapered NPT thread. Flush diaphragms and tapered threads such as the NPT type do not go together very well because the diaphragm is very sensitive to mechanical stresses during installation. An NPT thread seal is created by the tightening together of the male and female thread which causes a lot of localised stress. Parallel threads such as G1/4 do not provide the seal directly, but instead compress an O ring which sits around the outside of the male thread between two flat or grooved surfaces. A parallel thread requires significantly less torque than tapered threads to make a seal.
Also, it is often required by the installer to ensure that the flush diaphragm is not protruding from or recessing into the surface of the vessel wall. It is very easy to determine the precise depth of flush diaphragm when it is fitted with a parallel thread, but the depth a tapered thread device once installed is not so precise and can vary between devices and re-fitments of the same device.
-0.6 to +0.6 bar pressure range
Can the DMP331P pressure transmitter with flush pressure port be provided with a compound pressure range of -0.6barg to +0.6barg?
Yes it can, but it will be a custom scaling of the output and it should only be used with media that will always be below a temperature of +70 degrees Celsius.
180°C steam pressure
We are looking for units with ½” BSP connection for use on Steam at 180°C @ 12Bar with a range of between 0-20 BarG & an output of 4-20mA.
The DMP331P fitted with the cooling element and standard FKM seals will be suitable for temperatures up to 200°C.
- SKU ID: s1-dmp331p-0005
- Part No: 500-2002-1-3-100-Z00-1-1-1-200
- Pressure Range: 0 to 20
- Units: bar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4-20mA (2 wire)
- Accuracy: 0.35% 0.4bar range & above, 0.5% below
- Electrical Connection: DIN43650A plug IP65
- Process Connection: G1/2 Flush DIN3852, 1bar & above
- Process Connector Material: Stainless steel 316L
- Diaphragm Material: Stainless Steel 316L
- Media & Temperature: 200degC, Vac < 150degC, FKM seal
Using oil filled sensors in food processing
Why do some pressure measurement devices need to have a food grade oil filling?
The majority of pressure sensing devices which include an oil filled capsule have a thin isolation diaphragm containing a silicone oil filling. The silicon oil provides the pressure transfer medium between the process media and sensing element.
If the isolation diaphragm fails for whatever reason, the oil may leak into the process contaminating the product being processed. In food processing, any substance that might contaminate the process, must be harmless if consumed.
Standard silicone oil is not food compatible, and therefore some manufacturers will offer an alternative oil fill such as peanut oil, vegetable oil or a food grade silicone oil to make their products suitable for the food and drink industry.
Withstand 400°F to measure 130 psi steam pressure
We are plant based food processing company and we need a pressure transducer to measure 0-130PSI steam which can tolerate temperatures up to 400 degF, would the DMP 331 P be able to do this?
A DMP 331 P fitted with the 300°C cooling element will allow you use the sensor on steam at 400°F, and since the application is on food we would recommend a food grade oil fill behind the isolation diaphragm as a precaution to protect the process from contamination.
- SKU ID: s1-dmp331p-0001
- Part No: 500-1002-1-3-100-Z00-1-2-200
- Pressure Range: 0 to 10
- Units: bar
- Range Type: Positive Gauge (atm to +P)
- Output Signal: 4-20mA (2 wire)
- Electrical Connection: DIN43650A plug IP65
- Process Connection: G1/2 Flush DIN3852, P>=1bar only
- Process Connector Material: Stainless steel 316L
- Diaphragm Material: Stainless Steel 316L
- Media & Temperature: Food grade, 200degC max, Vac<150degC, FKM seal
Related Documents
Specification data sheet
Request Product Price
Please select the options you require for the DMP331P Hygienic Flush Pressure Transmitter in your application and request a quote.