EDS346-1-040-000 EDS346-1-100-000 EDS346-1-250-000 HYDAC Pressure Switch 600 bar

Product Overview

The EDS346 series electronic pressure switches are compact electronic pressure switches (pressure relays) 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 EDS346 series belongs to the EDS 300 product family, utilizing a thin-film DMS (strain gauge) on a stainless steel membrane measuring cell. These switches are characterized by compact, robust construction and high accuracy. They offer 1 PNP transistor switching output, with optional 4–20mA analog output available on certain variants.

This product range covers the following models: EDS346-1-040-000 (40 bar range), EDS346-1-100-000 (100 bar range), EDS346-1-250-000 (250 bar range), EDS346-1-400-000 (400 bar range), and EDS346-1-600-000 (600 bar range).

Our complete range of HYDAC EDS346 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 (using EDS346-1-250-000 as example) :

• EDS = Electronic Pressure Switch

• 346 = Product series code

• 1 = Number of switching outputs (1 = 1 PNP output; 2 = 2 PNP outputs; 3 = 2 PNP outputs + 1 analog output)

• 250 = Measuring range (250 bar)

• 000 = Design/configuration code

Technical Specifications

EDS346 Series General Specifications

• Product Series: HYDAC EDS 300 series electronic pressure switch

• Model Range: EDS346-1-040-000 through EDS346-1-600-000

• Brand: HYDAC

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

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

• Pressure Range: 16 – 600 bar (range options: 40 / 100 / 250 / 400 / 600 bar)

• Switching Output: 1 PNP transistor switching output

• Switching Load Capacity: Up to 1.2 A per output

• Output Function: Switch point or window function selectable; N/C or N/O selectable

• Switch Delay: 0.00 – 99.99 seconds adjustable

• Accuracy (Display) : ≤ ±1％FS

• Accuracy (Typical) : ≤ ±0.5％FS

• Display: 3-digit or 4-digit 7-segment LED, rotatable

• Display Units: bar / psi / MPa selectable

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

• Installation Torque: Approx. 25 Nm

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

• Supply Voltage: 9 – 35 V DC

• Ingress Protection: IP67 (when mated with corresponding connector)

• Media Temperature Range: -25°C to +80°C

• Ambient Temperature Range: -25°C to +80°C

• Weight: Approx. 0.36 kg

• Seal Material: FPM

• Programming: Menu-driven via tactile push buttons

• Compatible Hydraulic Fluids: Mineral oil, HFC fire-resistant fluids, etc.

Model Range Overview

• EDS346-1-040-000: Range 0–40 bar

• EDS346-1-100-000: Range 0–100 bar

• EDS346-1-250-000: Range 0–250 bar

• EDS346-1-400-000: Range 0–400 bar

• EDS346-1-600-000: Range 0–600 bar

Key Technical Advantages

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

The EDS346 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. Accuracy reaches ≤±0.5% FS typical, with long-term stability of 0.2% FS/year.

2. Compact Robust Design for Harsh Industrial Environments

The EDS346 series features a compact, robust constructionwith integrated measuring cell and electronics. With IP67 ingress protection (when mated with corresponding connector), it ensures reliable operation in dusty, humid, and high-vibration environments. Weight is only approx. 0.36 kg.

3. Flexible Output Configuration and Programming Features

The EDS346 series offers 1 PNP switching outputwith load capacity up to 1.2 A. Menu-driven programming via tactile push buttonsenables independent adjustment of switch point and reset hysteresis, switch delay setting (0.00–99.99 seconds) , N/O or N/C output selection, and window function configuration.

4. 4-Digit Rotatable LED Display with Multi-Unit Switching

Equipped with a 3-digit or 4-digit 7-segment LED display that is dual-axis rotatable for optimal readability in any mounting orientation. Display units can be freely switched between bar, psi, and MPa—no additional conversion required to read the desired pressure unit.

5. Wide Temperature Range and Excellent Temperature Characteristics

The EDS346 series supports a wide media and operating temperature range of -25°C to +80°C. Within the compensated temperature range of 0–70°C, temperature drift is below 0.2% FS, and across the full allowable operating temperature range, it remains below 0.5% FS.

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, 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, diesel engines

• Metallurgy and Construction Machinery: Pressure monitoring in harsh environments including steelworks, mining, and construction equipment

• High-Pressure Testing: Pressure limitation and safety protection for hydraulic test benches

Expert Maintenance Tips

1. Verify Model and Range Compatibility Prior to Installation

The EDS346 series offers five range options: 40, 100, 250, 400, and 600 bar. Confirm that the range indicated in the model code (e.g., EDS346-1-250-000 = 0–250 bar) 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 EDS346 series features G1/4 A DIN 3852 male thread pressure connection. Use a torque wrench during installation—recommended torque is approx. 25 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 electrical connection

• Supply voltage is 9–35 V DC—verify voltage is within the allowable range prior to wiring

• 1 PNP switching output is standard, with output load capacity up to 1.2 A

• Observe correct polarity during wiring—reverse connection may damage the device

4. Programming and Parameter Setting

• Menu navigation via tactile push buttons—simple and intuitive operation

• Switch point and reset hysteresis can be independently adjustedto suit various control requirements

• Switch delay (0.00–99.99 seconds) is configurable

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

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

5. Mounting Position and Vibration Protection

The EDS346 series can be mounted in any orientation. For critical applications with severe vibration or shock, mechanical decoupling is recommended—use a flexible pressure hose connection. For panel mounting, use the clamping bracket (ZBM300) ; the ZM14 adapter ensures the display panel faces the operator.

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 EDS346 series offers long-term stability of 0.2% FS/year. If abnormal signal drift or display anomalies are observed, arrange for servicing or replacement.

7. Temperature Effects and Compensation

The EDS346 series exhibits temperature drift below 0.2% FS within the 0–70°C range, and below 0.5% FS across the full operating temperature range. Under extreme temperature conditions, perform zero-point calibration during system commissioning to eliminate measurement deviations caused by installation location temperature variations.