Pressure Monitoring in Heating and Cooling Systems

Frequently Asked Questions

How does integrated temperature and pressure sensing within a single probe enhance hydronic loop thermal analysis?

Hydronic energy distribution requires precise insight into both mechanical fluid pressure and thermal conditions. The PM-HCS sensor combines a 316L stainless steel piezoresistive pressure die alongside an onboard thermal sensor inside a single process head. This dual-sensing architecture transmits synchronized pressure and temperature readings to the Ellenex Software Platform, allowing engineers to calculate real-time fluid density changes, track thermal transfer efficiency across heat exchangers, and spot thermal expansion risks without tapping multiple pipe ports.   

What thread specifications are available for mounting the transducer onto hydronic headers and balance valves?

The PM-HCS transmitter uses standard process thread configurations, including 1/4 inch NPT/G or 1/2 inch NPT/G male process fittings. Installers thread the 316L stainless steel sensor head directly into existing pressure test cocks, strainer taps, or pump suction/discharge ports. The media-isolated stainless face handles water-glycol mixtures, scale inhibitors, and mild chemical treatments standard in commercial HVAC loops.  

How does automated differential pressure monitoring across filter baskets protect circulating pumps?

Particulate buildup inside inline strainers restricts fluid flow, forcing circulating pumps to work harder and risking severe impeller cavitation. By measuring pressure drops across the strainer inlet and outlet ports, the PM-HCS continuously tracks flow resistance. When differential pressure exceeds normal operating bands, the Ellenex Software Platform triggers an automated maintenance alert, allowing technicians to clear the basket before pump flow drops low enough to trip boiler or chiller safety interlocks.  

How does the Ellenex Software Platform alert building managers during low loop pressure or thermal spikes?

The Ellenex Software Platform features a configurable alerting engine. Facility engineers establish high and low operational bounds for system static pressure and fluid temperature. If a pipe leak causes hydronic loop pressure to drop below minimum fill thresholds—or if cooling loop return temperatures exceed safe limits—the platform immediately sends multi-channel alerts via SMS, email, or mobile app push notifications to on-duty technicians.  

Why are sub-GHz LPWAN wireless networks ideal for subterranean boiler rooms and concrete plant basements?

Subterranean mechanical rooms and central chiller basements are often shielded by dense reinforced concrete, metal ductwork, and heavy machinery that block standard Wi-Fi or high-frequency cellular signals. The LoRaWAN variant (-L) uses sub-GHz Chirp Spread Spectrum radio waves to penetrate physical obstacles and reach central gateways. For sites lacking private gateways, the Cellular LPWAN variant (-N) utilizes NB-IoT with a +20 dB link budget improvement designed specifically to penetrate subterranean utility vaults.   

How does continuous hydronic pressure telemetry support energy conservation in VFD-controlled pumping systems?

Variable Frequency Drive (VFD) circulating pumps frequently run at higher speeds than necessary due to inaccurate or uncalibrated remote differential pressure sensors, wasting valuable electricity. Installing PM-HCS transmitters at critical loop junctions provides continuous, high-accuracy pressure telemetry. By routing this telemetry into building automation platforms via Open APIs, VFDs can dynamically adjust pump RPM to match actual heating/cooling loads, generating substantial electrical power savings.   

How does the sensor maintain up to 10 years of continuous operation without connection to building electrical mains?

The PM-HCS unit is powered by an internal replaceable 3.6V Lithium primary battery (LiSOCl2) designed for stable operation across temperature extremes (-30°C to +55°C). Guided by low-power firmware, the transmitter remains in a deep sleep state between measurement intervals. At scheduled intervals, the unit wakes up, energizes the pressure and temperature sensors, transmits encrypted LPWAN telemetry, and immediately returns to sleep. This efficient power cycle supports up to 10 years of autonomous operation without drawing power from building electrical circuits.