BD SENSORS DMP 333 High Pressure Transmitter

BD SENSORS DMP 333 High Pressure Industrial Pressure Transmitter

In high-pressure applications such as hydraulic systems, machine tools, injection molding machines, test benches, and mobile hydraulics, the long-term stability, impact resistance, and high overload capacity of pressure measurement are crucial. The DMP 333 industrial pressure transmitter launched by BD | SENSORS is designed to withstand high static and dynamic pressure loads. It uses stainless steel sensors and provides a nominal pressure range from 0... 100 bar to 0... 600 bar, with excellent resistance to pressure peaks. This article will provide a comprehensive and in-depth technical analysis of the transmitter from the aspects of product positioning, technical specifications, performance accuracy, environmental adaptability, explosion-proof certification, electrical connections, and selection points.

Product positioning and core advantages

DMP 333 is an industrial pressure transmitter specifically designed for high-pressure conditions, with a focus on responding to common rapid pressure changes, positive and negative pressure peaks, and long-term continuous loads in hydraulic systems. The transmitter adopts a modular concept, allowing the combination of different stainless steel sensors and electronic modules, and is equipped with multiple electrical and mechanical interface versions, forming a rich product line that almost meets the requirements of all hydraulic applications.

The core advantages include:

Excellent long-term stability, maintained even under high-speed dynamic pressure loads.

Not sensitive to peak pressure, with extremely high overpressure capability.

Optional intrinsically safe explosion-proof version (Ex ia), suitable for gas and dust environments.

Optional SIL 2 version, compliant with IEC 61508/IEC 61511 functional safety standards.

The highest accuracy can reach 0.1% FSO (full-scale output).

Nominal pressure and overload capacity

DMP 333 provides gauge or absolute pressure measurement, with the following nominal pressure range:

Nominal pressure [bar] 100 160 250 400 600

Overvoltage capability [bar] 210 600 1000 1000 1000

Blasting pressure ≥ [bar] 1000 1000 1250 1250 1800

Overpressure capability: refers to the maximum pressure that a transmitter can withstand without permanent drift or damage. For a range of 100 bar, the overpressure is 210 bar; The overpressure in the range of 250 bar and above reaches 1000 bar, far exceeding the nominal value.

Burst pressure: refers to the ultimate pressure value at which the transmitter housing or sensor physically ruptures. The burst pressure with a range of 600 bar can reach up to 1800 bar, demonstrating an extremely high safety margin.

This feature makes DMP 333 very suitable for transient impact pressure that may occur in hydraulic systems, such as hydraulic valve switching, end of cylinder stroke, and other scenarios.

Output signal and power supply

The transmitter provides multiple output signal options to adapt to different control system interfaces:

Standard (2-wire system):

4…20 mA

Supply voltage V_SS=8... 32 V DC (SIL version is 14... 28 V DC)

Intrinsic safety explosion-proof version (2-wire system):

4…20 mA

Supply voltage V_SS=10... 28 V DC (SIL version is 14... 28 V DC)

Optional 3-wire system:

0... 20 mA or 0... 10 V

Supply voltage V_SS=14... 30 V DC

Allowable load:

2-wire current output: maximum load resistance R_max=(V_SS - V_SS-min)/0.02 A

3-wire current output: maximum load of 240 Ω

3-wire voltage output: minimum load of 10 k Ω

Performance accuracy and impact quantity

Accuracy is defined according to the IEC 61298-2 standard, using the limit point adjustment method (including nonlinearity, hysteresis, and repeatability). Provide three levels of accuracy:

Accuracy level standard option 1 option 2

Maximum error ≤± 0.35% FSO ≤± 0.25% FSO ≤± 0.10% FSO

Impact Quantity:

Power supply impact: 0.05% FSO/10 V

Load impact: 0.05% FSO/k Ω

Long term stability:

Under reference conditions, ≤± 0.1% FSO/year

Response time:

2-wire system: ≤ 10 milliseconds

3-wire system: ≤ 3 milliseconds

Temperature characteristics and allowable range

Thermal effect (zero and range):

Tolerance zone: ≤± 0.75% FSO

Compensation range: 0... 70 ° C

Allowable temperature:

Medium temperature: -40... 125 ° C

Electronic components/ambient temperature: -40... 85 ° C

Storage temperature: -40... 100 ° C

The wide temperature range allows DMP 333 to be applied in various environments such as outdoor, cold storage, and high-temperature hydraulic oil.

Mechanical stability and materials

Mechanical stability (tested according to DIN EN 60068-2):

Vibration: 20 g RMS/10... 2000 Hz

Shock: 500 g/1 ms half sine wave

Material of liquid receiving components:

Pressure interface: Stainless steel 1.4404 (316L)

Diaphragm: Stainless steel 1.4435 (316L)

Sealing element: standard FKM (fluororubber); Optional EPDM (suitable for nominal pressure ≤ 160 bar); Other seals can be provided as needed

Shell material:

Standard: Stainless steel 1.4404 (316L)

Optional compact on-site shell: stainless steel 1.4301 (304)

Cable gland: M12x1.5, brass nickel plated (clamping range 2... 8 mm)

Electrical protection and electromagnetic compatibility

Short circuit protection: permanently effective

Reverse polarity protection: No damage, but the transmitter is not functioning at this time (i.e. it will not burn out, but it will not output the correct signal)

Electromagnetic compatibility: emission and immunity comply with EN 61326 standard

Explosion proof version (only applicable to 4... 20 mA/2-wire system)

DMP 333 can provide Ex ia certification for intrinsic safety, suitable for gas and dust environments:

Certification: IBExU 10 ATEX 1068 X/IECEx IBE 12.0027X

Gas explosion-proof mark: II 1G Ex ia IIC T4 Ga (applicable to Zone 0)

Dust explosion-proof mark: II 1D Ex ia IIIC T135 ° C Da (applicable to Zone 20)

Maximum value of security technology:

U_i = 28 V DC

I_i = 93 mA

P_i = 660 mW

C_i = 0 nF

L_i = 0 μH

The internal capacitance of the power supply connection to the shell is ≤ 27 nF

Explosion proof environment temperature limit:

Zone 0: -20... 60 ° C (atmospheric pressure 0.8... 1.1 bar)

Connection cables used in Zone 1 and above: -40/-20... 70 ° C (depending on cable type)

Cable parameters (provided by the factory):

Capacitor: signal line/shield line or signal line/signal line: 160 pF/m

Inductance: signal line/shielding line or signal line/signal line: 1 μ H/m

SIL 2 Functional Safety Version

For applications that require functional safety certification, DMP 333 can provide SIL 2 versions that comply with IEC 61508/IEC 61511. This version has specific requirements for the power supply voltage range (14... 28 V DC) and some combination limitations (such as not being able to be selected simultaneously with an accuracy of 0.1%). The SIL version is applicable for pressure monitoring in Safety Instrumented Systems (SIS).

Other important specifications

Current consumption: maximum 25 mA for signal output current type; maximum 7 mA for voltage type

Weight: Approximately 140 grams

Installation position: arbitrary (but calibration is performed in a vertical position with the pressure interface facing downwards)

Working life: 100 million load cycles (applicable to hydraulic pulse conditions)

CE Compliance: EMC Directive 2014/30/EU; Pressure Equipment Directive 2014/68/EU (Module A, only applicable to equipment with maximum overpressure>200 bar)

ATEX Directive: 2014/34/EU

Electrical connections and mechanical dimensions

DMP 333 provides multiple electrical connection methods to adapt to different installation environments:

Universal on-site shell (stainless steel 1.4404) with M20x1.5 cable gland (order code 880)

Other options available on demand: such as Bayonet MIL-C-26482 (10-6) connector (which will add 5 mm in length)

Cable output: Standard 2 m PVC cable (without air duct), allowed temperature -5... 70 ° C; other types and lengths can be provided as needed, including cables with air ducts (suitable for nominal pressure ≤ 160 bar range)

Mechanical dimensions (see dimension diagram in the manual for details): The transmitter is compact and suitable for installation on hydraulic blocks or pipelines with limited space. The pressure interface is made of stainless steel material and supports metric threads and other customized threads.

Typical application areas

According to the data manual, the preferred application areas for DMP 333 include:

Factory and Mechanical Engineering: Hydraulic Station Pressure Monitoring, Lubrication System.

Machine tool: hydraulic clamping, feed system pressure control.

Hydraulic press: measurement of master cylinder pressure and return pressure.

Injection molding machine: monitoring of injection pressure and mold locking pressure.

Handling equipment: lifting platform, forklift hydraulic system.

High altitude work platform: hydraulic pressure of boom.

Test bench: Performance testing of high-pressure hydraulic components.

Mobile hydraulic: hydraulic circuits for construction machinery and agricultural machinery.

Selection precautions

When choosing DMP 333, the following parameters need to be considered comprehensively:

Pressure range: 100/160/250/400/600 bar, gauge pressure or absolute pressure.

Accuracy requirements: 0.35% FSO (standard), 0.25% FSO (option 1), 0.1% FSO (option 2). Note that 0.1% accuracy cannot be combined with SIL versions.

Output signal: 2-wire system 4... 20 mA (standard), intrinsic safety 4... 20 mA, 3-wire system 0... 20 mA or 0... 10 V.

Explosion proof requirement: Is Ex ia certification (Zone 0/20) required.

Functional safety: Is SIL 2 certification required.

Electrical connections: cables (length, material, with or without ventilation pipes), M12 × 1.5 connectors, MIL connectors, on-site enclosures, etc.

Seal material: standard FKM; EPDM can be selected for low temperature or specific media (limited to ≤ 160 bar).

Medium temperature range: Confirm if it is within -40... 125 ° C.

Mechanical interface: Pressure interface thread specifications (metric, imperial, etc.).

Installation and usage suggestions

The installation direction of the transmitter during factory calibration is vertical (with the pressure interface facing downwards). If other directions are used in practical use, there may be slight zero offset due to the weight of the diaphragm or the hydrostatic pressure of the oil. This offset can be adjusted on-site through software or accepted (usually much smaller than the accuracy).

For situations with rapid pressure changes, it is recommended to use the 3-wire version (response time ≤ 3 ms) to more accurately capture pressure peaks.

When used in explosive environments, it is necessary to follow the safety installation requirements of ATEX and IECEx, ensure that the power supply is limited to the maximum safe value, and use appropriate intrinsically safe cables.

It should be avoided to install the transmitter in areas with severe vibration or impact exceeding the specification value, and vibration reduction measures should be added if necessary.

After long-term use, it is recommended to conduct regular calibration (such as once a year) to confirm that the accuracy is still within the allowable range. The long-term stability of the transmitter is 0.1% FSO/year, which can usually meet the overhaul cycle of most industrial equipment.