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Absolute Pressure Transducer AD 1000
Precise absolute pressure measurement for process lines, test benches and laboratories with the Halstrup-Walcher AD 1000.
An absolute pressure transducer measures pressure against a perfect vacuum rather than the surrounding atmosphere, so the reading holds steady through weather and altitude changes. The Halstrup-Walcher AD 1000 covers ranges from 0 to 50 kPa up to 90 to 110 kPa, ±1% FS accuracy, with 4 to 20 mA or 0 to 10 V output and an optional display.
1 Product · Absolute Pressure Transducer
Selection guide
Absolute Pressure Transducer AD 1000 Guide
How an absolute pressure transducer works
The AD 1000 seals one side of its sensing diaphragm against a near-perfect vacuum reference. Process pressure on the other side deflects the diaphragm by an amount proportional to the absolute pressure, independent of the surrounding atmosphere. That matters in closed systems, vacuum chambers and gas density calculations, where a gauge sensor referenced to a changing atmosphere would drift.
How to choose an absolute pressure transducer
- Range: the AD 1000 is available in 0 to 50 kPa, 0 to 100 kPa, 80 to 120 kPa and 90 to 110 kPa spans; pick the one that puts your working pressure mid-range.
- Accuracy: ±1% FS, with a temperature coefficient of 0.04%/K, so the reading stays accurate as ambient temperature shifts.
- Output: 0 to 10 V, 10 to 20 mA or 4 to 20 mA, to match your PLC or data logger input.
- Display: order with or without a local digital readout.
- Environment: IP54 protection and an operating range of 10 to 60 °C.
- Power supply: 24 V DC, 24 V AC, 115 V AC or 230 V AC, so it fits most panel supplies.
For pressure referenced to the atmosphere instead of a vacuum, see barometric pressure transducers.
FAQ
Common questions
What's the difference between absolute and gauge pressure?
Gauge pressure is measured against the surrounding atmosphere, so it shifts with weather and altitude. Absolute pressure is measured against a perfect vacuum, so it stays fixed regardless of atmospheric conditions. Use absolute measurement in closed systems, vacuum processes and gas density calculations where a changing atmospheric reference would distort the reading.
What accuracy does the AD 1000 absolute pressure transducer offer?
The AD 1000 is accurate to ±1% of full scale, with a temperature coefficient of 0.04% per kelvin, so the reading barely shifts as ambient temperature changes. It's available with or without a local display, and IP54 protection suits typical plant and lab environments.
Which output signal does the AD 1000 support?
It offers three standard outputs: 0 to 10 V for data loggers and panel meters, and 10 to 20 mA or 4 to 20 mA current loops for PLCs and DCS inputs. Choose the one that matches your existing wiring and input card, and confirm the loop resistance against the transducer's rating.
Can an absolute pressure transducer be used in a vacuum chamber?
Yes, that's one of its main uses. Because the AD 1000 references a sealed vacuum rather than the surrounding atmosphere, it gives a true reading of chamber pressure without needing a separate barometric correction, which suits vacuum processes and test benches.
What power supply does the AD 1000 need?
It accepts 24 V DC, 24 V AC, 115 V AC or 230 V AC, so it fits most existing panel supplies without an extra transformer. Confirm your supply voltage and tolerance when ordering, since the device is factory-configured to one supply type.
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