This product was originally published on December 7, 2021, and updated on July 18, 2025.
In pharmaceutical and biotech facilities—as well as in HVAC systems for cleanrooms, isolation labs, and critical-care environments—maintaining precise and stable differential pressure is essential to prevent cross-contamination, ensure air containment, and meet strict regulatory standards. But monitoring ultra-low pressure differentials can be complex and error-prone with conventional sensors.
Ashcroft, a trusted name in pressure instrumentation, addresses this challenge with its GXLdp Differential Indicating Pressure Transducer. Designed specifically for mission-critical, highly pure environments, this pressure sensor ensures reliable, accurate and maintainable performance where it matters most.
In this article, you’ll learn what makes the GXLdp stand out with its precision technology, in-place calibration feature, versatile mounting options and the ability to deliver dependable performance right out of the box.
The Ashcroft GXLdp differential pressure transducer is engineered to meet the precision and reliability demands of ultra-clean environments. Below are the key features that set it apart—each designed to solve critical challenges in pressure monitoring, calibration and installation.
Si-Glas™ MEMS Sensor Technology
At the heart of the GXLdp is Ashcroft’s Si-Glas™ MEMS sensor. Unlike traditional piezoresistive sensors, this capacitive MEMS sensor is made from a bonded silicon and glass structure that’s inherently stable. Its ultra-thin diaphragm responds to minute pressure changes with exceptional measurement sensitivity, repeatability and long-term reliability, making it ideal for detecting extremely low differential pressures found in control rooms and critical environments.
This technology minimizes drift, improves long-term accuracy and withstands harsh installation conditions such as shock, vibration, or overpressure—common pain points for other sensor types. The result: lower maintenance, greater reliability, and total confidence in your pressure data. Watch video to learn more.
TruAccuracy™ Out-of-the-Box Precision
TruAccuracy™ means the Ashcroft® GXLdp is factory-calibrated to meet its specified ±0.25% or ±0.5% terminal point accuracy—no additional field calibration is required. This eliminates guesswork around sensor performance and removes the need to apply root-sum-square (RSS) calculations to estimate true accuracy.
Whether you're installing the GXLdp in a sterile lab, isolation room or bio-safety cabinet, you can trust that it will deliver immediate and accurate readings from the moment it's powered on.
SpoolCal® Actuator for Safe, In-Place Calibration
In critical environments, taking pressure sensors offline for recalibration can jeopardize containment or require costly shutdowns. Ashcroft’s SpoolCal® actuator feature solves this by allowing users to isolate and validate the GXLdp while it remains installed and connected.
With a simple turn of a dial, users can engage the internal calibration spool, eliminating the need to disconnect the device, breach process lines or perform calibrations in a separate location. Here's how it works:
- Turn the SpoolCal® actuator 90 degrees counterclockwise to enter the monitor mode and perform a validation while the unit remains exposed to process pressure.
- Turn it 90 degrees clockwise to enter calibration mode, while the unit is isolated from process pressure.
Multiple Outputs and Flexible Mounting Options
The GXLdp is designed to support a wide range of output signals including 4–20 mA, 0–5 V, 0–10 V, 1–5 V, and 1–6 V, allowing seamless integration with modern building automation systems and PLCs.
Additionally, it offers three mounting configurations—wall, panel, and DIN rail—to suit diverse application needs. This adaptability makes it easy to retrofit existing systems or specify for new construction without compromising performance or accessibility.
Product specifications for the Ashcroft® GXLdp Pressure Transducer
Where you can find the GXLdp Differential Pressure Transducer
Thanks to its high accuracy, ultra-low pressure range, and cleanroom-ready design, the GXLdp is trusted across a variety of precision-critical environments, including:
Cleanrooms and Isolation Labs
Used in pharmaceutical compounding labs, biotech production suites, and hospital isolation rooms where maintaining positive or negative pressure prevents contamination and ensures occupant safety.
HVAC Systems for Critical Environments
Ideal for high-performance HVAC systems in healthcare, semiconductor fabs, and food processing plants, where it helps control pressurization, airflow balance, and energy efficiency.
Fume Hoods and Biological Safety Cabinets
Monitors pressure differentials across barriers to protect researchers and maintain sterile conditions during sensitive testing or manufacturing processes.
Filter Monitoring
Used to track pressure drop across HEPA and ULPA filters in clean air applications, helping ensure proper airflow and timely filter replacement in compliance with cleanroom standards.
Pharmaceutical Manufacturing
Ensures validated control of pressurized zones in GMP environments, supporting strict regulatory requirements for airborne contamination control and batch integrity.
Biotech and Life Science Facilities
Supports precise differential monitoring in fermentation chambers, sterile production zones, and research labs, where even small pressure fluctuations can affect outcomes.
Product recommendations for this pressure transducer
If you need a high-accuracy (±0.25% of full span) pressure transducer that can measure down to 0.1 in. H₂O and provide an easy-to-read digital display, the GXLdp is a great option. It offers excellent over-pressure protection of 15 psi Proof Pressure for all ranges, and two programmable switch outputs are available- NPN or PNP.
However, if a large number of units are required to fit into a small footprint, the GXLdp may be too large in size. In this case, the Ashcroft® DXLdp Pressure Transducer is the better choice.
Ready to learn more?
With detailed information about the Ashcroft® GXLdp Pressure Transducer, you can now determine whether this low-pressure differential sensor is the best choice for your specific application. It is backed by a three-year product warranty, so you know you can depend on its reliability.
For more additional pressure measurement insights, check out the following articles.
- Choosing a Pressure Transducer for Critical Environments
- Calibrating a Low-Pressure Transducer for Critical Environments
- How Accurate Are Your HVAC System’s Pressure Instruments?
- How Much Do Pressure Transducers Cost? (6 Factors Impacting Price)
Or contact us directly to speak to one of our industry experts and get all your pressure sensor questions answered. In the meantime, download our guide to learn more about accuracy statements. 