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PS480
MDP Hydraulics
The stainless steel digital pressure gauge is a high-precision and highly reliable pressure measurement instrument specially designed for industrial testing, calibration and process monitoring. It features a fully stainless steel housing and a highly stable pressure sensor. Through advanced microprocessors, it performs signal processing and temperature compensation, displaying the pressure value in clear digital form in real time. This product perfectly replaces the traditional mechanical pointer pressure gauge, completely solving the problems of visual disparity, vibration sensitivity, zero drift and reading estimation error of pointer gauges. It is particularly suitable for laboratory calibration, on-site pressure testing, equipment matching, as well as harsh industrial environments such as corrosive and vibrating conditions.
The core of the instrument is a high-precision pressure sensor (usually a diaphragm silicon, monocrystalline silicon or ceramic piezoresistive type). When the pressure of the measured medium (gas or liquid) acts on the sensor's sensitive diaphragm, the diaphragm undergoes a micro deformation, causing a change in the resistance value of its internal Wheatstone bridge, thereby outputting a weak electrical signal proportional to the pressure. This signal is amplified, filtered and digitized by the built-in high-performance amplifier circuit and ASIC dedicated chip in the instrument. The microprocessor (MCU) performs nonlinear correction, automatic compensation for zero drift and temperature drift of the digital signal, and finally displays the precise pressure value intuitively through a high-brightness LED or a large-sized LCD display. Some models also support converting the processed pressure value into standard analog signals (such as 4-20mA) or digital signals (such as RS485 Modbus) for output, facilitating remote monitoring and system integration.
• Outstanding accuracy and stability: Utilizing imported or high-performance pressure sensing cores, the basic error can reach various levels such as ±0.05% F.S., ±0.1% F.S., and ±0.25% F.S. An internal intelligent temperature compensation algorithm is incorporated, effectively suppressing temperature drift and achieving typical long-term stability of ±0.2% F.S. per year, ensuring the long-term reliability of measurement data.
• All-stainless steel sturdy structure: The case, connectors, and core liquid-contacting components are all made of 304 or 316L stainless steel, featuring excellent corrosion resistance, wear resistance, and impact resistance. The protection level is usually IP65/IP67, capable of withstanding harsh industrial environments such as oil, dust, and moisture.
Wide operating temperature range: The temperature range of the medium it can handle is typically -20℃ to +80℃, and for some high-temperature models, it can reach up to 150℃; the environmental temperature range it can tolerate is generally -20℃ to +60℃.
Excellent vibration resistance: The electronic components are soldered by surface mount technology and assembled as a whole. It is specially designed for strong-vibration environments such as pumps, compressors, and construction machinery, ensuring stable readings without any jitter.
Multiple power supply options: Supports built-in lithium battery (with a battery life of 1-3 years or even longer), 24VDC or 220VAC power supply, meeting different power supply conditions at the site.
Rich display and functions: The large-screen LCD has backlighting, capable of displaying pressure values, percentage bar graphs, units (such as MPa, psi, bar, etc., with multiple options available), peak records, and real-time curves, etc.
One-click reset and calibration: It supports on-site manual reset, and some high-end models can perform remote or local intelligent calibration through software, making maintenance very convenient.
Flexible output and communication: In addition to local display, it can provide 4-20mA two-wire current signal, 1-5V/0-10V voltage signal, as well as RS485 (Modbus RTU protocol) digital communication interface, making it easy to connect to PLC, DCS, SCADA or data acquisition systems.
Measurement principle: Strain gauge type (diffused silicon / monocrystalline silicon / ceramic)
Range: Gauge Pressure: -0.1 MPa to 0 MPa to 260 MPa (optional)
Absolute Pressure: 0 kPa to 10 kPa to 60 MPa
Vacuum/Composite: -100 kPa to 0 MPa to 2.5 MPa
Accuracy grades: 0.05 class, 0.1 class, 0.2 class, 0.5 class, 1.0 class (optional)
Display screen: 4-bit/5-bit/6-bit LCD or LED, with backlight.
Overload capacity : typically 150% to 300% of the full scale (depending on the range)
Long-term stability : ≤ ±0.2% F.S. / year (typical value)
Working power supply: 3.6V lithium battery, 3 AA batteries, 24VDC (10-30VDC), 220VAC (optional)
Medium temperature: 20℃ to +80℃ (standard), -40℃ to +150℃ (high-temperature type available upon request)
Environmental temperature: -20℃ to +60℃ (standard), -30℃ to +70℃ (wide temperature range)
Output signal: 4-20mA (two-wire system), 0-5V/0-10V/1-5V, RS485 (Modbus)
Pressure connection interface: M20×1.5 (standard), G1/2, 1/4 NPT, G1/4, etc. (customizable as needed)
Shell material: 304/316L stainless steel
Protection class： IP65, IP67 (dust and waterproof)
Explosion-proof certification: Ex ia II CT6 (Intrinsically safe explosion-proof, optional)
Pressure verification and measurement: As a high-precision standard instrument, it is used for laboratory or field calibration of pressure transmitters, pressure switches, mechanical pressure gauges, etc.
• Industrial process testing: Hydraulic and pneumatic system testing, pipeline pressure testing, pump and compressor performance testing, valve testing, etc.
• Equipment support: Pressure monitoring for various equipment such as construction machinery (excavators, cranes), generator sets, air compressors, refrigeration equipment, and variable-frequency constant-pressure water supply systems.
Petrochemical industry: Monitoring of wellhead pressure, injection pressure, and process flow pressure, capable of withstanding corrosive media.
Electricity Metallurgy: Monitoring of pressure in boilers, steam pipelines, and hydraulic systems.
Food and pharmaceutical: Utilizing food-grade stainless steel, it meets hygiene standards and is used for monitoring the pressure of the tank and the pipeline.
To ensure the best performance, please follow the steps below for selection:
1. Determine the type and range of pressure:
Pressure type: Gauge pressure, Absolute pressure, Vacuum or Composite pressure.
Range: When selecting the range, the normal working pressure should be between 1/3 and 2/3 of the range. Avoid using it continuously at the full range or near the lower limit. For example, if the test pressure is approximately 10 MPa, you can choose a range of 0-16 MPa or 0-25 MPa.
2. Clearly define accuracy and functional requirements:
Accuracy: Choose based on testing requirements. Laboratory calibration is recommended at 0.05 class or 0.1 class; industrial monitoring can select 0.2 class or 0.5 class.
Output and Communication: Is 4-20mA signal remote transmission required? Is RS485 connection for network access necessary?
Special features: Do you need peak hold, data recording, unit switching, or backlight?
3. Confirmation of medium and environmental conditions:
Medium compatibility: Ensure that the measured gas or liquid is non-corrosive to 316L stainless steel. For highly corrosive media, it is necessary to confirm or select special diaphragm materials (such as Hastelloy alloy).
Environmental temperature and vibration: Select products that are suitable for the extreme temperatures of the site and have the required vibration resistance level.
Explosion-proof requirements: In areas prone to fire and explosion, it is necessary to select models that have corresponding explosion-proof certifications.
4. Interface selection and power supply:
Process interface: Match the thread specifications of the on-site pipelines or equipment.
Power supply method: Choose battery power supply or external power supply based on the convenience of the on-site power source.
• Correct installation: The instrument should be installed vertically (unless otherwise permitted by the product instructions). Use a wrench to tighten the hexagonal part of the pressure interface. Do not rotate the case directly to avoid damaging the internal structure. Ensure that the medium being measured is clean and free of solid particles.
• Power On and Zero Reset: After powering on, without applying any pressure, press the "Zero Reset" button to eliminate the zero-point deviation.
Overload protection: It is strictly prohibited to apply loads exceeding the specified overload pressure. Even a short-term overload can cause permanent damage to the sensor.
• Daily Maintenance:
Regularly check whether the display is clear and whether the battery is fully charged (with low battery alert).
Keep the sensor diaphragm and interface clean to prevent dirt from clogging or corroding them.
When used in harsh conditions, it is recommended to perform precision calibration at regular intervals (such as every six months or annually) to ensure measurement accuracy.
• Safety Warning: Before disassembling the instrument, make sure that the system pressure has been completely released to a safe level.
| PS480- | 6 | R | D | B | M20 | M | - | Instructions |
| PS480- | PS480 Digital Pressure Relay | |||||||
| 6 | Dial diameter 60mm | |||||||
| 8 | Dial diameter 80mm | |||||||
| R | Radial type | |||||||
| A | Axial type | |||||||
| D | Output mode: Single relay(5 cores) | |||||||
| S | Output mode: Dual relay(8 cores) | |||||||
| R | Output mode:RS485 communication(4-cores)(Only 60 watch heads are available for selection) | |||||||
| - | See range table | |||||||
| M20 | Process connection: M20*1.5 thread(installation thread default) | |||||||
| G14 | Process connection: G1/4 thread | |||||||
| G12 | Process connection: G1/2 thread | |||||||
| R14 | Process connection: R1/4 thread | |||||||
| R38 | Process connection: R3/8 thread | |||||||
| N14 | Process connection: NPT1/4 thread | |||||||
| N12 | Process connection: NPT1/2 thread | |||||||
| M14 | Process connection: M14*1.5 thread | |||||||
| M | Male thread | |||||||
| K | Internal thread | |||||||
| - | Measurement accuracy: 0.5% (factory default) | |||||||
| 02 | Measurement accuracy:0.25% |
A1: Compared to the traditional mechanical gauge, this digital pressure gauge has significant improvements in several aspects:
• Accuracy and reliability: The digital gauge uses electronic sensors for measurement, achieving higher accuracy (up to ±0.1% F.S.). It has no mechanical transmission components, so there is no wear, no delay, and excellent long-term stability. It is not affected by the zero-point drift problem of the pointer gauge.
• Reading and Functionality: The large screen displays digital numbers, with no loss of clarity, and remains legible even in poor lighting or in vibrating environments. It features intelligent functions such as peak retention, unit switching, and data output, which are impossible for mechanical watches to achieve.
• Environmental adaptability: The entire structure is made of stainless steel, with a high level of protection (such as IP65/IP67). It has excellent resistance to vibration and impact, and is particularly suitable for use in harsh conditions such as test benches and mobile devices.
A2: Choosing the correct range is crucial for accuracy and the lifespan of the instrument. It is recommended to follow the "1/3 - 2/3" principle, meaning that the pressure values you typically test should fall within 1/3 to 2/3 of the selected range. For example, if you mainly test 10 MPa of pressure, choosing a range of 0-16 MPa or 0-25 MPa would be an ideal choice. Do not keep the pressure at full scale or close to zero for an extended period, as this will reduce the measurement resolution and the lifespan of the sensor.
A3: The accuracy grade indicates the maximum allowable error as a percentage of the full scale (F.S.). For example, for a 10 MPa range meter with a 0.5 grade, the maximum error is ±0.05 MPa.
• 0.1 grade: Used for high-precision laboratory calibration and as a standard meter.
• 0.2/0.5 level: Suitable for most industrial site tests, equipment performance verification and process monitoring. It is the most cost-effective option.
• Level 1.0: Suitable for general pressure indication.
A4: This depends on your usage environment and the measured medium:
• 304 stainless steel: General-purpose type, with good corrosion resistance, suitable for most non-strongly corrosive industrial environments such as air, water, and oils.
• 316L stainless steel: It has superior corrosion resistance, especially capable of resisting corrosion from chlorides, acids, and bases. Situations where 316L must be chosen include: when the measurement medium is seawater, chemical fluids, acid-base solutions, or when it is applied in high-corrosive environments such as coastal areas, chemical industries, and paper mills.
A5: These two signals are used for different system integration requirements:
• 4-20mA analog output: An industrial standard signal with strong anti-interference ability and long transmission distance. It is used for the analog input modules of PLCs, recorders, and controllers to monitor in real time.
• RS485 digital output (Modbus RTU): Suitable for networked and digital systems. One bus can connect multiple instruments, easily integrating with SCADA, industrial control computers or data acquisition systems, enabling remote configuration and data reading.
• How to choose: If you only need to transmit the pressure signal to a single controller, select 4-20mA. If you need networking, centralized management, or multi-parameter reading, select RS485. Many high-end models support both outputs simultaneously.
A6: Yes, to ensure the long-term accuracy and traceability of the measurement data, regular calibration is necessary. The calibration cycle depends on the usage frequency, environmental conditions, and precision requirements. Generally, it is recommended:
• For critical tests and quality control instruments: every 6 months to 1 year.
• Routine industrial monitoring: Every 1 to 2 years.
For instruments used in harsh environments (such as high temperatures, vibrations, and corrosion), the calibration cycle should be shortened. They can be sent to a qualified metrology institution for calibration or calibrated on-site by professionals.
A7:
• Correct installation: It should be installed vertically. Use a wrench to tighten the hexagonal part of the interface. Do not rotate the case.
• Pressure application: Slowly open the valve to avoid damaging the sensor with pressure shock. Do not exceed the maximum overload pressure.
• Compatibility of medium: Ensure that the measured medium is compatible with the liquid-contacting parts of the instrument (typically the 316L diaphragm). For dirty, high-temperature or high-viscosity media, an additional isolation diaphragm can be considered.
• Safety first: Before disassembling or maintaining, make sure that the system pressure has been completely released.
A8: Please follow these steps to troubleshoot:
1. Check the power supply: Check the battery model for battery level; check the external power supply model for voltage stability.
2. Check the pressure source: Confirm if the system pressure is stable.
3. Release pressure and reset: Release the pressure and perform the "zero point reset" operation.
4. Check the wiring: For models with output, check if the signal lines are securely connected and without short circuits.
5. Sensor failure: If all the above steps are normal, it might be that the sensor is damaged due to overload, contamination or corrosion. Contact the supplier for maintenance.
A9: Yes, but it must be a dedicated model with corresponding explosion-proof certification. Ordinary digital pressure gauges are not explosion-proof. For environments prone to flammability and explosion such as oil, chemical, and coal mines, it is necessary to purchase instruments with intrinsically safe explosion-proof (Ex ia IIC T6) or flameproof (Ex d) certifications, and install and connect them strictly in accordance with explosion-proof specifications.
A10: You can obtain them in the following ways:
1. Visit the official website: Download the datasheet on the product page.
2. Contact sales: Request a technical information package from the sales representative that includes detailed technical parameters, size diagrams and wiring diagrams.
3. Technical support: If you need a 3D model (in STEP format) for design, or an official calibration certificate for factory installation, please directly contact the technical support department and provide the specific product model.
