EDS346-3-400-000 EDS346-3-600-000 EDS348-5-016-000 HYDAC Pressure Switch 600 bar

Product Overview

The EDS300 series electronic pressure switches are compact electronic pressure switches engineered by HYDAC for industrial hydraulic and pneumatic applications, featuring integrated digital display and push-button programming. They are widely used for hydraulic system pressure monitoring, limit value alarming, accumulator charging control, and pump/compressor automation.

The EDS300 series utilizes a thin-film DMS (strain gauge) on a stainless steel membrane measuring cell, characterized by compact, robust construction and high accuracy. This range covers the EDS346 and EDS348 sub-series:

• EDS346 Series: Offers 1 switching output + 1 analog output (4–20mA). Models include EDS346-3-400-000 (400 bar range) and EDS346-3-600-000 (600 bar range)

• EDS348 Series: Offers 2 PNP switching outputs + 1 switchable analog output (4–20mA / 0–10V). Models include EDS348-5-016-000 (16 bar range) and EDS348-5-040-000 (40 bar range)

Our complete range of HYDAC EDS300 electronic pressure switches strictly adheres to OEM technical standards, achieving 100% direct interchangeability with original components. Every unit undergoes 100% simulated operating condition bench testing prior to shipment, ensuring performance parameters are fully consistent with genuine HYDAC products. Direct replacement significantly reduces equipment downtime and maintenance costs.

⚠️ Model Code Decoding:

• EDS = Electronic Pressure Switch

• 346 / 348 = Product series code (346 = 1 switch + 1 analog output; 348 = 2 switches + 1 analog output)

• 3 (EDS346 series) = 1 switching output + 1 analog output

• 5 (EDS348 series) = 2 PNP switching outputs + 1 switchable analog output (4–20mA / 0–10V)

• 400 / 600 / 016 / 040 = Measuring range (bar)

• 000 = Standard configuration

Technical Specifications 

EDS346-3-400-000

• Product Series: HYDAC EDS300 series electronic pressure switch

• Model Code: EDS346-3-400-000

• Brand: HYDAC

• Product Type: Compact electronic pressure switch (with digital display)

• Measuring Range: 0 – 400 bar

• Maximum Operating Pressure: 800 bar

• Output Configuration: 1 switching output + 1 analog output (4–20mA)

• Sensor Technology: Thin-film DMS (strain gauge) on stainless steel membrane

• Mechanical Connection: G1/4 A ISO 1179-2

• Electrical Connection: M12×1, 4-pin male connector

• Supply Voltage: 20 – 32 V DC

• Switching Output Load: Up to 1.2 A

• Accuracy: ≤±0.5% FS typical, ≤±1% FS max

• Display: 3-digit or 4-digit LED

• Ingress Protection: IP67

• Seal Material: FPM

• Installation Torque: Approx. 20 Nm

• Weight: Approx. 0.22 – 0.36 kg

EDS346-3-600-000

• Product Series: HYDAC EDS300 series electronic pressure switch

• Model Code: EDS346-3-600-000

• Brand: HYDAC

• Product Type: Compact electronic pressure switch (with digital display)

• Measuring Range: 0 – 600 bar

• Maximum Operating Pressure: 1000 bar

• Output Configuration: 1 switching output + 1 analog output

• Sensor Technology: Thin-film DMS (strain gauge) on stainless steel membrane

• Mechanical Connection: G1/4 A DIN 3852 (external thread)

• Electrical Connection: M12×1, 4-pin male connector

• Supply Voltage: 20 – 32 V DC

• Switching Output Load: Up to 1.2 A

• Accuracy: ≤±0.5% FS typical

• Display: 3-digit or 4-digit LED

• Ingress Protection: IP67

• Seal Material: FPM

• Installation Torque: Approx. 20 Nm

• Weight: Approx. 0.22 kg

EDS348-5-016-000

• Product Series: HYDAC EDS300 series electronic pressure switch

• Model Code: EDS348-5-016-000

• Brand: HYDAC

• Product Type: Compact electronic pressure switch (with digital display)

• Measuring Range: 0 – 16 bar (relative)

• Overload Pressure: 32 bar

• Burst Pressure: 200 bar

• Output Configuration: 2 PNP switching outputs + 1 switchable analog output (4–20mA / 0–10V)

• Sensor Technology: Thin-film DMS (strain gauge) on stainless steel membrane

• Mechanical Connection: G1/4 A DIN 3852 (external thread)

• Electrical Connection: M12×1, 5-pin male connector

• Supply Voltage: 10 – 30 V DC

• Switching Output Load: Up to 1.2 A per output

• Accuracy (Typical) : ≤±0.5% FS

• Accuracy (Max) : ≤±1% FS

• Repeatability: ≤±0.5% FS

• Temperature Drift: ≤±0.03% FS/°C

• Display: 3-digit LED, bar/MPa/psi switchable

• Operating Temperature: -25°C to +80°C

• Media Temperature: -25°C to +80°C

• Compensated Temperature: -10°C to +70°C

• Ingress Protection: IP67

• Wetted Parts: Stainless steel, FPM seals

• Installation Torque: 20 Nm

• Weight: Approx. 300g

EDS348-5-040-000

• Product Series: HYDAC EDS300 series electronic pressure switch

• Model Code: EDS348-5-040-000

• Brand: HYDAC

• Product Type: Compact electronic pressure switch (with digital display)

• Measuring Range: 0 – 40 bar

• Overload Pressure: 80 bar

• Burst Pressure: 200 bar

• Output Configuration: 2 PNP switching outputs + 1 switchable analog output

• Sensor Technology: Thin-film DMS (strain gauge) on stainless steel membrane

• Mechanical Connection: G1/4 A ISO 1179-2

• Electrical Connection: M12×1, 5-pin male connector

• Supply Voltage: 10 – 30 V DC

• Switching Output Load: Up to 1.2 A per output

• Accuracy: ≤±0.5% FS typical

• Display: 3-digit or 4-digit LED

• Operating Temperature: -25°C to +80°C

• Ingress Protection: IP67

• Installation Torque: 20 Nm

• Weight: Approx. 300g

Key Technical Advantages

1. Thin-Film DMS Technology for High Accuracy and Long-Term Stability

The EDS300 series utilizes a thin-film DMS (strain gauge) on a stainless steel membrane measuring cell. Compared to conventional piezoresistive sensors, thin-film DMS technology delivers higher accuracy, superior long-term stability, and better temperature characteristics. Typical accuracy reaches ≤±0.5% FS with repeatability ≤±0.5% FS.

2. Flexible Output Configurations for Diverse Control Requirements

The EDS346 series offers 1 switching output + 1 analog output (4–20mA); the EDS348 series offers 2 PNP switching outputs + 1 switchable analog output (4–20mA / 0–10V). Both configurations cover applications from simple switch alarming to closed-loop control. Each switching output handles loads up to 1.2 A.

3. Push-Button Programming with Extensive Parameter Adjustment

Menu-driven programming via tactile push buttons enables independent adjustment of switch point and reset hysteresis, switch delay setting, N/O or N/C output selection, and window function configuration. The EDS348 series also supports parameter locking to prevent unauthorized adjustments.

4. Wide Temperature Range with Excellent Temperature Characteristics

The EDS300 series supports a wide media and operating temperature range of -25°C to +80°C. The EDS348 series exhibits temperature drift ≤±0.03% FS/°C, with exceptional stability within the compensated temperature range of -10°C to +70°C.

5. Compact Robust Design for Harsh Industrial Environments

The EDS300 series features a compact, robust construction with IP67 ingress protection (when mated with corresponding connector). The EDS348 series has no mechanical contacts, withstanding hundreds of millions of switching cycles with excellent vibration resistance.

6. 100% Direct Interchangeability and Simulated Condition Testing

All models strictly adhere to HYDAC original mounting dimensions and interface standards (G1/4 A DIN 3852 / ISO 1179-2, M12×1 electrical connection), enabling direct drop-in replacement of original pressure switches without piping modification or system adjustment. Every unit undergoes 100% simulated operating condition bench testing prior to shipment, ensuring consistent, stable performance at rated pressure and temperature.

Application Areas

• Hydraulic System Pressure Monitoring: System pressure detection and limit value alarming for hydraulic power units and stations

• Accumulator Charging Control: Precise control and monitoring of accumulator charging functions

• Pump and Compressor Control: Automatic start/stop and pressure protection for pumps and compressors

• Hydraulic and Pneumatic Equipment: Pressure monitoring and indication for various hydraulic and pneumatic equipment

• Marine and Gearbox Monitoring: Pressure or limit value monitoring for marine gearboxes and diesel engines

• High-Switching-Frequency Applications: Applications requiring high switching frequency or constant switching accuracy

• EDS348 Series: Complex control systems requiring multiple switching outputs + analog output

Expert Maintenance Tips

1. Verify Model and Range Compatibility Prior to Installation

The EDS300 series offers multiple range options including 16, 40, 100, 250, 400, and 600 bar. Confirm that the range indicated in the model code covers the system operating pressure. For optimal accuracy and service life, it is recommended that maximum operating pressure not exceed 80% of the full scale.

2. Correct Installation Torque and Sealing

The EDS300 series features G1/4 A DIN 3852 or G1/4 A ISO 1179-2 male thread pressure connections. Use a torque wrench during installation—recommended torque is approx. 20 Nm. Use OEM-specification O-rings or bonded sealing washers—PTFE tape must not be used (it may block internal sensor passages). Ensure piping is clean prior to installation to prevent debris from damaging the sensor diaphragm.

3. Electrical Connection Precautions

• EDS346 Series: Features M12×1, 4-pin male connector

• EDS348 Series: Features M12×1, 5-pin male connector

• Supply voltage: EDS346 series 20–32 V DC; EDS348 series 10–30 V DC

• Observe correct polarity—reverse connection may damage the device

4. EDS348 Series Output Configuration Note

The “5” in EDS348 series models indicates 2 PNP switching outputs + 1 switchable analog output (4–20mA / 0–10V). The analog output can be switched between 4–20mA (2-wire) and 0–10V (3-wire). Verify controller input type matches the selected analog output prior to wiring.

5. Programming and Parameter Setting

• Menu navigation via tactile push buttons

• Switch point and reset hysteresis can be independently adjusted

• Switch delay is configurable

• Output function selectable between N/O (normally open) or N/C (normally closed) 

• Display units (bar/MPa/psi) can be freely switched via the menu

• EDS348 series supports parameter locking

6. Periodic Calibration and Functional Checks

Perform calibration checks every 12 months or according to system criticality to verify that the deviation between displayed value and actual pressure remains within specification. The EDS300 series offers excellent long-term stability. If abnormal signal drift or display anomalies are observed, arrange for servicing or replacement.