Keller Company Differential Pressure Sensor Series 33X

High-precision differential pressure sensor with RS485 digital output - capable of liquid/liquid differential pressure measurement!

The differential pressure sensor 33X achieves an extremely high accuracy of 0.05% full scale (FS) in the temperature range of 10 to 40°C through a mathematical correction method. In addition to a digital RS485 interface, analog current or voltage outputs are also available. 【Features】 • Piezo-resistive differential pressure sensor capable of measuring liquid/liquid differential pressure • Accuracy of ±0.05 %FS in the temperature range of 10 to 40°C • Standard dual outputs of digital RS485 and analog output (Analog output options include 4–20 mA, 0–5 V, 0–10 V, and 0.1–2.5 V) • Analog output range can be changed via digital RS485 • Line pressure: up to 60MPa • Excellent long-term stability • Correction technology using a mathematical model to provide accurate pressure values

basic information

Pressure range: 0 to 30 kPa to 0 to 3 MPa Accuracy: ± 0.05 %FS Overall accuracy: ± 0.1 %FS @ -10 to 80 °C Line pressure: 20 MPa / 60 MPa Output: RS485, 4 to 20 mA, 0 to 5 V, 0 to 10 V, 0.1 to 2.5 V

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Applications/Examples of results

• Filter monitoring • Flow measurement • Leak test • For laboratory use • Industrial applications

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Keller Company High-Precision Differential Pressure Sensor PD-33X

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Differential Pressure Measurement in Industrial Applications - A Detailed Look at the World of Differential Pressure Measurement
- Company news
How do differential pressure sensors work, and how do they differ from other sensor types? Gauge pressure and absolute pressure sensors have defined reference points for measuring pressure differences (for absolute pressure: absolute vacuum; for gauge pressure: atmospheric pressure). In contrast, differential pressure sensors measure the difference between two pressures without defining a reference point. Differential pressure sensors can be constructed in various designs, one feature of KELLER Pressure's products is that there are types that can use liquid at both ports (e.g., model PD-33X). They can measure differential pressure with high resolution. There are also sensors that use two absolute pressure measurement cells to measure two pressures and calculate the differential pressure through electronic circuits (model PD-39X). This structure is particularly suitable for high-pressure applications. Typical applications of differential pressure sensors: 1. Flow measurement There are several methods for measuring flow, but one common method is differential pressure measurement through an orifice plate. 2. Level measurement of liquefied gas tanks Liquefaction reduces volume, allowing for transportation and storage. Why is differential pressure measurement suitable for this level measurement? For more details, please visit the URL below!

Jun 27, 2025

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KELLER Pressure Japan 日本支社

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Our company is the Japanese branch of KELLER Pressure (Switzerland). Since its establishment, KELLER Pressure has developed and produced all its products at its factory in Winterthur, Switzerland, and is a leading manufacturer of pressure transducers and pressure transmitters, certified with ISO 9001. As a core business, we manufacture and sell over 1.3 million pressure measurement cells annually, offering products with pressure ranges from 5 mbar (500 Pa) to 2000 bar (200 MPa). With the extensive experience gained from all our products, our solutions can cater to a variety of applications. We are highly regarded as a manufacturer of high-precision pressure sensors and also accommodate OEM and custom products. We have received positive feedback from many customers. Contact: sales.jp@keller-pressure.com

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