HDA3800-E-350-124 HDA3840-A-250-124 HYDAC Pressure Transmitter 600 bar

Product Overview

The HDA series pressure transmitters are high-precision pressure measurement devices engineered by HYDAC for industrial hydraulic and process control applications, widely used for pressure monitoring and control in hydraulic systems, construction machinery, metallurgical equipment, and test benches. These transmitters feature thin-film DMS (strain gauge) technology on a stainless steel membrane, delivering high accuracy, excellent stability, superior temperature characteristics, and outstanding EMC performance.

This product range covers the following sub-series and models:

• HDA3800 Series: Thin-film DMS on stainless steel membrane, total error 0.3%, accuracy ≤±0.15% FS typical, measuring range 6–600 bar. HDA3800-E-350-124 (350 bar range) and HDA3800-E-600-124 (600 bar range). Specifically developed for steelworks (metallurgical industry) demanding measurement applications.

• HDA3840 Series: Variant of the HDA3800 series with pre-installed cables (6–20 meters available). HDA3840-A-250-124 (250 bar range) and HDA3840-A-350-124 (350 bar range). Suitable for mining and steelworks.

• HDA4745 Series: Core product of the HDA4700 family, featuring thin-film DMS on stainless steel membrane, total error 0.5%, accuracy ≤±0.25% FS typical (≤0.5% FS max). Measuring range 6–600 bar, temperature range -40°C to +125°C, vibration resistance 50g, IP67 protection.

• HDA4744 Series: High-precision electronic pressure transmitter of the HDA4700 series, accuracy ≤±0.25% FS typical. Based on PT100 temperature sensor with corresponding evaluation electronics, temperature measuring range -25°C to +100°C.

⚠️ Product Note: Within the HDA series product line, HDA3800 / HDA3840 are pressure transmitters; HDA4744 / HDA4745 can serve as both pressure sensors and temperature sensors (temperature transmitters) . HDA4744 utilizes PT100 temperature sensing elements.

⚠️ Model Code Decoding (using HDA3800-E-350-124 as example) :

• HDA = HYDAC Pressure Transmitter series

• 3800 = Product series code (3800/3840/4744/4745)

• A / E = Electrical connection/output configuration (A = cable output; E = connector)

• 350 = Measuring range (350 bar)

• 124 = Design/configuration code

Technical Specifications 

HDA3800 Series General Specifications (HDA3800-E-350-124 / HDA3800-E-600-124)

• Product Series: HYDAC HDA3800 series pressure transmitter

• Product Type: Pressure transmitter

• Brand: HYDAC

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

• Measuring Ranges: 16 – 600 bar (multiple ranges available)

• Overload Pressures: 32 – 1000 bar (range dependent)

• Burst Pressure: 200 – 2000 bar

• Total Error: 0.3%

• Accuracy (Typical) : ≤±0.15% FS

• Accuracy (Max) : ≤±0.3% FS

• Temperature Compensation (Zero) : ≤±0.005% FS/°C typ.; ≤±0.01% FS/°C max.

• Temperature Compensation (Span) : ≤±0.005% FS/°C typ.; ≤±0.01% FS/°C max.

• Non-linearity (DIN 16086) : ≤±0.2% FS max.

• Hysteresis: ≤±0.1% FS

• Output Signals: 4–20mA (2-wire); 0–20mA (3-wire); 0–10V

• Mechanical Connection: G1/4 A DIN 3852 / G1/2 A DIN 3852

• Installation Torque: 20 Nm (G1/4 A); 45 Nm (G1/2 A)

• Wetted Parts: Stainless steel (mech. connection); Viton seal (G1/4 A) / NBR O-ring (G1/2 A)

• Operating Temperature Range: -40°C to +100°C

• Rated Temperature Range: -25°C to +85°C

• EMC Characteristics: Excellent, ensuring signal stability in harsh EMI environments

• Long-term Stability: Excellent

• Weight: Approx. 0.3 kg

HDA3840-A-250-124 / HDA3840-A-350-124

• Product Series: HYDAC HDA3840 series pressure transmitter (HDA3800 modified series)

• Product Type: Pressure transmitter (with pre-installed cable)

• Brand: HYDAC

• Sensor Technology: Thin-film DMS on stainless steel membrane

• Measuring Range: 250 bar / 350 bar

• Accuracy: ≤±0.15% FS typical

• Output Signal: 4–20mA (2-wire)

• Mechanical Connection: G1/4 A DIN 3852

• Installation Torque: 15 – 20 Nm

• Cable Length: 6 – 20 meters available

• Operating Temperature: -40°C to +85°C

• Ingress Protection: IP55

• Applications: Mining, steelworks

HDA4745 Series (HDA4745-A-250-000 / HDA4745-B250-000)

• Product Series: HYDAC HDA4700 series pressure transmitter

• Product Type: Pressure transmitter / Temperature transmitter

• Brand: HYDAC

• Sensor Technology: Thin-film DMS on stainless steel membrane

• Measuring Range: 6 – 600 bar

• Accuracy (Typical) : ≤±0.25% FS

• Accuracy (Max) : ≤±0.5% FS

• Temperature Compensation: ≤±0.08% FS/10K typical

• Long-term Drift: ≤±0.2% FS/year

• Output Signal: 4–20mA (2-wire)

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

• Electrical Connection: DIN EN 175301-803 / 3p + PE

• Operating Temperature Range: -40°C to +125°C

• Normal Temperature Range: -25°C to +85°C

• Vibration Resistance: 50g

• Ingress Protection: IP67

• Weight: Approx. 0.145 kg

HDA4744 Series (HDA4744-A-060-000 / HDA4744-B-250-000)

• Product Series: HYDAC HDA4700 series high-precision electronic pressure transmitter

• Product Type: Pressure transmitter / Temperature transmitter (PT100-based)

• Brand: HYDAC

• Sensor Technology: Thin-film DMS on stainless steel membrane

• Measuring Range: 6 – 600 bar

• Accuracy (Typical) : ≤±0.25% FS

• Accuracy (Max) : ≤±0.5% FS

• Temperature Compensation: ≤±0.08% FS/10K typical

• Temperature Measuring Range (PT100) : -25°C to +100°C

• Output Signal: 4–20mA (2-wire)

• Mechanical Connection: G1/4 A DIN 3852

• Installation Torque: Approx. 20 Nm

• Wetted Parts: Stainless steel, FKM seals

• Normal Temperature Range: -25°C to +85°C

• Overload Pressures: 20 – 900 bar

• Weight: Approx. 0.145 kg

Key Technical Advantages

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

The HDA3800, HDA3840, HDA4744, and HDA4745 series all utilize thin-film DMS (strain gauge) technology on stainless steel membranes. The sensor cell is robust and (precision-engineered). Calibrated to DIN 16086 standards, the HDA3800 series achieves accuracy ≤±0.15% FS typical, while the HDA4700 series achieves ≤±0.25% FS typical. Long-term stability is excellent with annual drift ≤±0.2% FS.

2. Exceptional Temperature Characteristics – Minimal Temperature Error

The HDA3800 series excels in temperature compensation, with zero-point and span temperature drift both ≤±0.005% FS/°C typical and ≤±0.01% FS/°C max. The HDA4700 series offers temperature compensation ≤±0.08% FS/10K typical. This ensures excellent measurement accuracy across the -40°C to +125°C wide temperature range.

3. Outstanding EMC Performance for Harsh Industrial Environments

The HDA series features excellent electromagnetic compatibility (EMC) . In metallurgical, mining, and construction machinery environments with strong electromagnetic interference, these transmitters maintain stable signal output. The HDA3800 series is specifically developed for steelworks demanding measurement applications, maintaining signal stability under high-frequency, high-intensity EMI.

4. Robust Construction and High Ingress Protection

The HDA4700 series features a highly robust sensor cell with vibration resistance up to 50g and IP67 ingress protection. The HDA3800 series also features a highly robust sensor cell suitable for harsh environments including mining and steelworks.

5. Flexible Mounting and Electrical Connection Options

The HDA series offers G1/4 A DIN 3852 and G1/2 A DIN 3852 mechanical connection options. Electrical connections include DIN EN 175301-803 connectors and pre-installed cables. The HDA3840 series comes with pre-installed cables in lengths from 6 to 20 meters, greatly facilitating remote installation applications.

6. 100% Direct Interchangeability and Simulated Condition Testing

All models strictly adhere to HYDAC original mounting dimensions and interface standards (G1/4 A / G1/2 A), enabling direct drop-in replacement of original transmitters 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

• Metallurgical Industry: Pressure monitoring and control for steelworks and rolling mill hydraulic systems

• Mining Machinery: Pressure measurement for underground LHDs and mining truck hydraulic systems

• Construction Machinery: Pressure monitoring for excavators, wheel loaders, cranes

• Industrial Hydraulic Systems: System pressure monitoring for hydraulic power units and stations

• Test Benches: High-precision pressure measurement for laboratory and test bench applications

• Process Control: Pressure monitoring for chemical, petroleum, thermal, and water supply industries

• HDA4744/HDA4745: Applications requiring simultaneous temperature and pressure measurement

Expert Maintenance Tips

1. Verify Model and System Compatibility Prior to Installation

The HDA series offers multiple ranges (6–600 bar), output signals (4–20mA / 0–20mA / 0–10V), and electrical connection types (connector/cable). Confirm that the selected model’s range covers system operating pressure and that the output signal matches the controller.

2. Correct Installation Torque

HDA3800 series features G1/4 A DIN 3852 or G1/2 A DIN 3852 connections with recommended torque 20 Nm (G1/4 A) or 45 Nm (G1/2 A) . HDA3840 series recommended torque 15–20 Nm. HDA4744/HDA4745 series torque approx. 20 Nm.

3. Installation Position and Piping Requirements

• Install the transmitter where the measured medium flow is stable; avoid installation within 3 pipe diameters of the hydraulic pump outlet to prevent pressure pulsation from affecting measurement accuracy

• Ensure piping is clean prior to installation to prevent debris from damaging the sensor diaphragm

• Use appropriate sealing materials (Viton or NBR O-rings) at mechanical connections

4. Electrical Connection Precautions

• HDA3800/HDA3840 series supply voltage: 10–30 VDC

• Output signal: 4–20mA (2-wire) — observe correct polarity

• HDA3840 series features pre-installed cables—verify cable length meets installation requirements prior to wiring

5. Temperature Effects and Compensation

The HDA series offers excellent temperature compensation performance across wide temperature ranges. However, under extreme temperature conditions, perform zero and span calibration during system commissioning to eliminate measurement deviations caused by installation location temperature variations.

6. Periodic Calibration and Inspection

Perform calibration checks every 12 months or according to system criticality to verify that output signal vs. pressure correspondence remains within accuracy specification. If abnormal signal drift or sluggish response is observed, arrange for servicing or replacement.

7. Ingress Protection and Environmental Protection

HDA4700 series offers IP67 ingress protection; HDA3840 series offers IP55. After installation, ensure electrical connections remain properly sealed to prevent moisture and contaminant ingress. In high-dust, high-humidity environments such as mining and steelworks, consider additional protective covers.