EDS1791-N-400-000 EDS1791-P-016-000 EDS1791-P-100-000 HYDAC Pressure Switch 600 bar

Product Overview

The EDS1700 series electronic pressure switches are fixed high-pressure electronic pressure switches engineered by HYDAC for industrial hydraulic and pneumatic applications, combining a pressure sensor, pressure switch, and digital display in a single device. They are widely used for hydraulic system pressure monitoring, limit value alarming, accumulator charging control, and process automation.

The EDS1700 series utilizes a thin-film DMS (strain gauge) on a stainless steel membrane measuring cell, offering high accuracy, high reliability, and long service life. The product provides 4 relay switching outputs and 1 switchable analog output (4–20mA / 0–10V), with 4 switching points and switch-back points independently adjustable via the membrane keypad.

This product range covers the following models:

• EDS1791-N-400-000 (Material No. 906206): Range 0–400 bar

• EDS1791-P-016-000 (Material No. 906195): Range 0–16 bar

• EDS1791-P-100-000 (Material No. 906197): Range 0–100 bar

• EDS1791-P-250-000 (Material No. 906199): Range 0–250 bar

⚠️ Model Note: In the EDS1791 series, “N” and “P” denote different output configurations and model variants. Both EDS1791-N-xxx-000 and EDS1791-P-xxx-000 provide 4 relay switching outputs + 1 analog output (4–20mA / 0–10V), with the primary difference being the measuring range and specific configuration.

Our complete range of HYDAC EDS1700 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.

Technical Specifications 

EDS1700 Series General Specifications

• Product Series: HYDAC EDS1700 series electronic pressure switch

• Model Range: EDS1791-N-400-000, EDS1791-P-016-000, EDS1791-P-100-000, EDS1791-P-250-000

• Brand: HYDAC

• Product Type: Fixed high-pressure electronic pressure switch

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

• Type of Pressure: Relative (gauge)

• Pressure Units: BAR / PSI / MPA (switchable)

• Switching Outputs: 4 relay switching outputs

• Analog Output: 4–20mA / 0–10V (switchable)

• Electrical Connection: Terminal strip (14-pole terminal block)

• Mechanical Connection: G1/4 ISO 1179-1 / internal thread

• Accuracy: ≤±0.5% FS or ≤±1% FS (model dependent)

• Display: 4-digit LED digital display

• Operation: Membrane keypad programming

• Supply Voltage: 22–32 V DC

• Ingress Protection: IP67

• Operating Temperature Range: -25°C to +70°C

• Weight: Approx. 0.85 kg

Model Range Overview

• EDS1791-N-400-000 (906206): Range 0–400 bar, relative pressure, 4 relay outputs + analog

• EDS1791-P-016-000 (906195): Range 0–16 bar (232 psi), relative pressure, 4 relay outputs + analog

• EDS1791-P-100-000 (906197): Range 0–100 bar (1450 psi), relative pressure, 4 relay outputs + analog

• EDS1791-P-250-000 (906199): Range 0–250 bar, relative pressure, 4 relay outputs + analog

Key Technical Advantages

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

The EDS1700 series utilizes a thin-film DMS (strain gauge) on a stainless steel membrane measuring cell. Accuracy reaches ≤±0.5% FS or ≤±1% FS (model dependent), with excellent long-term stability and repeatability ≤±0.25% FS.

2. 4 Relay Outputs + Analog Output for Flexible System Integration

The EDS1700 series provides 4 relay switching outputs and 1 switchable analog output (4–20mA / 0–10V). The 4 switching points and switch-back points can be independently set via the membrane keypad. The analog output enables seamless integration with PLCs and other control systems.

3. 4-Digit LED Display with Membrane Keypad Programming

Equipped with a 4-digit LED digital display showing real-time pressure values. The membrane keypad enables easy configuration of switching points, switch-back points, hysteresis adjustment, and display unit switching (bar / psi / MPa)—simple and intuitive operation.

4. Rugged and Durable for High-Switching-Frequency Applications

The EDS1700 series features no mechanical contacts, withstanding millions of switching cycles. With IP67 ingress protection, it is particularly suitable for applications requiring high switching frequency and stable switching point accuracy.

5. Wide Range Coverage for Diverse Application Needs

The EDS1700 series offers complete range coverage from 16 bar to 600 bar. This batch covers multiple range options including 16 bar, 100 bar, 250 bar, and 400 bar—suitable for applications from low-pressure pneumatics to ultra-high-pressure hydraulics.

6. 100% Direct Interchangeability and Simulated Condition Testing

All models strictly adhere to HYDAC original mounting dimensions and interface standards (G1/4 ISO 1179-1, 14-pole terminal block 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

• Construction Machinery: Pressure monitoring for excavators, wheel loaders

• Process Technology: Pressure monitoring and alarming in industrial process control

• High-Switching-Frequency Applications: Demanding applications requiring millions of switching cycles

Expert Maintenance Tips

1. Verify Model and Range Compatibility Prior to Installation

The EDS1700 series offers multiple range options from 16 bar to 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 EDS1700 series features G1/4 ISO 1179-1 / internal thread pressure connections. Use a torque wrench during installation to the torque value specified in HYDAC technical manuals. 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

• EDS1700 series features 14-pole terminal block electrical connection

• Supply voltage is 22–32 V DC

• Provides 4 relay switching outputs and 1 analog output (4–20mA / 0–10V switchable)

• Verify supply voltage is within the allowable range and observe correct polarity prior to wiring

4. Programming and Parameter Setting

• Menu navigation via membrane keypad

• 4 switching points and switch-back points can be independently set without mutual interference

• Supports Hysteresis and Window function configuration

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

5. Mounting Position and Orientation

The EDS1700 series can be mounted in any orientation. For applications with severe vibration or shock, mechanical decoupling via a flexible pressure hose connection is recommended to protect the sensor from vibration damage.

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 EDS1700 series offers repeatability ≤±0.25% FS with excellent long-term stability. If abnormal signal drift or display anomalies are observed, arrange for servicing or replacement.