Hydac HYDAC HDA 4000 (HDA 4300, 4400, 4700)
HYDAC gauge pressure transducers of the HDA family, with 4...20 mA or 0...10 V output, for hydraulics and pneumatics.
The HDA family of HYDAC ELECTRONIC GMBH groups gauge pressure transducers with a 4...20 mA (2-wire) or 0...10 V (3-wire) output. The code begins with the series: HDA 4300 has a thick-film ceramic measuring cell, for low pressure ranges (from -1...1 bar to 40 bar), HDA 4400 has a thin-film cell on a stainless steel diaphragm, for ranges from -1...1 bar up to 2000 bar, and HDA 4700 is the version with a typical accuracy of 0.25 %. A code such as HDA 4345-A-0040-000-F1 is read as follows: series 43, mechanical connection 4 (G1/4 A), electrical connection 5 (EN 175301-803 connector), signal A (4...20 mA), range 0040 (40 bar), seal F (FKM).
We prepare the quotation from the full code on the label of the existing transducer, including the suffix (for example F1) and, where present, the HYDAC material number (for example 014T005631). If the label is missing, please send us the pressure range, the output signal, the mechanical and electrical connection and the seal material. The lead time is normally 24–72 h when the item is available locally or at the supplier, and 1–4 weeks on order; we confirm the variant in the manufacturer's documentation before quoting.
Models and codes
| Code | Note |
|---|---|
| HDA 4345-A-0001-000-F1 | HDA 4300 series, range -1...1 bar, 4...20 mA, G1/4 A, EN 175301-803 connector. |
| HDA 4345-A-0040-000-F1 | HDA 4300 series, range 0040 (40 bar) according to the manufacturer's code key, FKM seal; the code requested in enquiries. |
| HDA 4445-A-100-000 | HDA 4400 series, 0...100 bar, 4...20 mA, G1/4 A, EN 175301-803 connector. |
| HDA 4445-A-400-000 | HDA 4400 series, 0...400 bar, 4...20 mA. |
| HDA 4445-B-400-000 | HDA 4400 series, 0...400 bar, 0...10 V output (letter B in the code). |
| HDA 4745-A-400-000 | HDA 4700 series, 0...400 bar, typical accuracy 0.25 %. |
Key specifications
| HDA 4300: measuring ranges | -1...1; -1...5; -1...9; 1; 2.5; 4; 6; 10; 16; 25; 40 bar |
|---|---|
| HDA 4400: measuring ranges | -1...1 up to 2000 bar |
| Output signal | 4...20 mA (2 fire) / 0...10 V (3 fire) |
| Accuracy HDA 4300 / 4400 | ≤ ±0.5 typical; ≤ ±1.0 max % FS |
| Accuracy HDA 4700 (product presentation) | 0.25 typical; 0.50 max % |
| Supply voltage | 8...30 (2 fire); 12...30 (3 fire) V DC |
| Operating temperature | -40...+85 / -25...+85 °C |
| Protection class | IP 65 (Binder 714 M18); IP 67 (M12x1, EN 175301-803) |
| Mechanical connection | G1/4 A ISO 1179-2; G1/2 B DIN EN 837 |
HDA 4300, HDA 4400 and HDA 4700 appear as current products in the manufacturer's documentation, and the HDA 4300 and HDA 4400 brochures carry edition 03.24, with no announcement of withdrawal.
Frequently asked questions
How do I identify exactly the HYDAC transducer to be replaced?
Read the full code from the label (for example HDA 4345-A-0040-000-F1) and the material number, if shown. The digits in the code indicate the series, the mechanical and electrical connection, the signal, the range and the seal, according to the code key in the manufacturer's brochure.
Are HDA 4345 and HDA 4445 the same series?
No. According to the manufacturer, HDA 4300 has a ceramic cell for low pressures, while HDA 4400 has a thin-film cell on a stainless steel diaphragm, for wider ranges. We confirm the correct series from the code before quoting.
What data should I send for a quotation?
The full code from the label or, if it is missing, the pressure range, the output signal (4...20 mA or 0...10 V), the mechanical and electrical connection, and the seal material (FKM or EPDM).
Other Hydac series
The correspondence between a full code (for example HDA 4345-A-0040-000-F1) and the HYDAC material number is established on the full code from the transducer label, on which the quotation is also based. The manufacturer organises the family into separate series HDA 4300, 4400 and 4700.
Updated: 2026-11-12