SDHmini-Ex: Fast, Repeatable Trace‑Moisture Measurement for Natural Gas and Process Gas
Accurate trace‑moisture data under challenging operating conditions, such as those found in process and natural gas applications, is reliant on a handheld that responds quickly and performs consistently.
The SDHmini‑Ex is built for that environment: rapid spot checks, stable readings, and straightforward data handling across natural gas and process‑gas applications.
Portable performance, aligned to field work
The SDHmini-Ex delivers ±2 °C (±3.6 °F) accuracy across a practical handheld range of −100 °C to +20 °C (−148 °F to +68 °F) dewpoint. That span covers routine checks at TEG dryer outlets and pipeline compliance work, while giving ample margin for troubleshooting dryer systems. View readouts directly in ppm(v), lb/MMSCF or °F/°C dewpoint, so results align with site practice and reporting requirements.
Desiccant dry‑down: speed to stable readings
Moisture measurements often see slow response or inaccurate readings when the sensor lines or fittings are subject to excess moisture or ingress. This over saturation of the sensor due to contact with ambient air can lead to a “sluggish” response and longer dry-down recovery time.
The integration of the desiccant dry‑down chamber in Shaw portable hygrometers, such as in the SDHmini range, isolates the sensor environment and drives the sensor toward dry conditions rapidly, helping the sensor recover quickly for rapid response to trace amounts of moisture within the sample gas with minimal purge or wait times.
AutoCal: fast verification
The unique feature of Shaw instruments is the AutoCal, or autocalibration feature. Whilst it’s true for compliance and best practice, regular calibration to a known international standard, such as NIST or NPL is essential, but for the majority of applications, it isn’t practical to recalibrate between every use for optimal performance or to safeguard process integrity.
AutoCal is a valuable asset for checking sensor performance at more frequent intervals. If an anomaly in the system is detected, knowing you can quickly perform AutoCal to rule out sensor damage can avoid or minimise a complete operational shutdown.
AutoCal streamlines frequent calibration checks with a controlled, repeatable procedure directly on the instrument. The result is a reliable confirmation of performance, which can be performed by any process engineer or user, providing less disruption—useful during planned maintenance windows and before critical QA activities such as custody‑transfer checks or outage work.
SDHmini-Ex
Portable Dewpoint Hygrometer
Built for hazardous locations and portable use
The SDHmini‑Ex features:
- UL, ATEX, and IECEx intrinsic‑safety certification so technicians and engineers can work in safety and with confidence.
- A long‑life rechargeable battery supporting 150+ hours between charges
- Data logging of 300,000 readings across multiple locations.
- USB and Bluetooth connectivity to simplify data offload to maintenance systems and compliance records.
PSS – Portable Sample System
for the SDHmini range
Sampling Procedure that protects data quality
The SDH-PSS features:
- Reliable sampling conditions supporting fast, accurate, and repeatable measurement.
- Reduced risk of contamination, ingress, and absorption through filtration, flow-control and pressure regulation.
- A compact, powder-coated stainless‑steel assembly makes commissioning, troubleshooting, and periodic QA work efficient without fixed infrastructure.
If you’d like a demonstration, we are showcasing the SDHmini-Ex at the Analyzer Tech Conference 2026, Galveston, Texas, April 13-17.
Not able to make it, but still need in-depth support?
Contact our applications team with your application details, and we will help devise a sampling approach that delivers stable, dependable readings.
