TSI Alnor HM650 | Hydronic Manometer

The TSI Alnor HM650 is a highly accurate, handheld pressure-measuring instrument designed for balancing and troubleshooting hydronic heating and cooling systems. It is an essential tool for HVAC technicians and mechanical contractors, allowing for the precise measurement of differential pressure across pumps, valves, and balancing valves to ensure optimal system performance and energy efficiency.

Product Specifications

Feature	Specification Details
Product Name	TSI Alnor Hydronic Manometer
Model	HM650
Measurement Type	Differential Pressure
Pressure Range	0 to 300 psi (0 to 2068 kPa)
Accuracy	±1% of reading or ±0.03 psi (whichever is greater)
Display	Backlit LCD
Communication	USB port for data logging and reporting
Power	AA Alkaline or NiMH rechargeable batteries

Application Fields

This manometer is primarily used in commercial and industrial HVAC/R maintenance:

Hydronic System Balancing: Ensuring proper flow distribution throughout complex piping networks.
Pump Performance Monitoring: Measuring pressure drop across pumps to verify flow rates against the manufacturer’s performance curves.
Valve Diagnostics: Checking differential pressure across balancing valves to confirm they are set correctly.
Energy Auditing: Identifying inefficient system components that cause excessive pressure drops and waste energy.

Product Usage Instructions

Setup: Ensure the device is calibrated and the firmware is up-to-date. Connect the high and low-pressure hoses to the corresponding ports on the HM650.
Purging: Before connecting to the system, use the provided purge valves to bleed air out of the hoses. Air trapped in the lines can lead to significant measurement inaccuracies.
Connection: Attach the probes to the test ports on the hydronic system. Ensure the seals are tight and that there are no leaks.
Operation: Power on the unit and select the desired pressure units (psi, bar, or kPa). Monitor the display for stable readings. If required, use the hold or data-logging function to record readings for further analysis.
Maintenance: After use, flush the hoses with clean water if necessary and store the unit in its protective case. Periodically check the probe seals for wear.

TSI Alnor HM650 Hydronic Manometer

Frequently Asked Questions (Q&A)

Q: Can the HM650 be used to measure flow directly?

A: The HM650 measures differential pressure. However, by inputting the specific Cv (flow coefficient) of the balancing valve into the device’s software, it can calculate and display the volumetric flow rate.

Q: How often should the device be calibrated?

A: TSI recommends annual calibration to maintain the accuracy and reliability of the instrument.

Q: Is the HM650 compatible with all hydronic fluids?

A: The HM650 is designed for common water and glycol mixtures. Avoid using it with corrosive chemicals or fluids that could damage the internal sensors or hose materials.

Q: What should I do if the readings are fluctuating wildly?

A: Fluctuating readings are often caused by trapped air in the lines. Ensure you have properly bled the air from both the hoses and the test ports. Also, verify that the hose connections are fully seated.