Decarbonisation Technology November 2026 issue

Figure 4 Vaisala DMT143 dew point transmitter

measurements with the support of Vaisala engineers. Vaisala’s team of global experts provide technical support in humidity metrology. Their continued guidance helped the team evaluate moisture measurement in hydrogen at varying pressures and low dew point levels. This was especially important because moisture measurement in hydrogen at pressures substantially different from atmospheric conditions is not fully understood across the scientific community or industry. Vaisala’s technical expertise helped JTEC make informed decisions about how to approach pressure compensation and measurement confidence in those conditions. Measurement confidence for field deployment As JTEC prepares its first production system for deployment in a field pilot, Vaisala measurement technology gives the company confidence that it can monitor moisture closely enough to protect critical reactor components. For example, JTEC must tightly control moisture content in the hydrogen gas as it returns to the reactors, making measurement accuracy, repeatability, and robustness central to field readiness. The need for the highest level of certainty in moisture measurements is crucial for operating a reactor system of this scale in a field pilot. The investment in the reactor system is significant, so it is vital to ensure complete confidence in the moisture content being returned to the reactors. The Vaisala sensors help JTEC: • Confirm moisture removal performance across the gas management system.

to specification before returning to the metal hydride reactors. JTEC used a Vaisala DMP370 Ex-rated sensor in this location (see Figure 3 ). Beyond the stability and accuracy of the DMP370, working with Vaisala to explore a transition to sensors rated for hazardous environment operation helped JTEC prepare for future customer requirements in demanding end-use environments. The third measurement point is in JTEC’s maintenance manifold, which adjusts gas pressures in different parts of the system during start-up, shutdown, and maintenance operations. A Vaisala DMT143 dew point transmitter (see Figure 4 ) was used to confirm that moisture was not moved from the wet side of the system into dry sections that supply hydrogen to critical components. Implementation was straightforward. The sensors were installed as part of the larger system assembly and integrated with JTEC’s control system. For a dynamic batch process where pressure, temperature, and flow can vary significantly through a cycle, measurement performance, data accessibility, and technical support were especially important. Vaisala’s auto-calibration feature significantly improves confidence in the data received, which has proven to be very beneficial. At the same time, pressure compensation routines have been successfully integrated into dew point Figure 3 Vaisala DMP370 intrinsically safe dew point instrument (with DMP374 for pressurised processes)