The role of sensors in stable HVAC systems: Heavy duty pressure transducers
The right sensors help create more stable HVAC systems
By Ketan Mehta, Honeywell Sensing and Control,
Whether it’s a high-rise office tower or a manufacturing floor, Heating, Ventilation and Air Conditioning (HVAC) systems are designed for building occupants’ comfort.
When systems operate at optimum levels, they’re energy efficient and go unnoticed. When they’re not, efficiency drops and
Each component system (heating, ventilation and air conditioning) comprising the overall HVAC system uses pressure
sensors: board-mount pressure sensors in air-handling systems,
high pressure air flow sensors in Variable Air-Flow Volume
Systems (VAV), and heavy-duty pressure transducers in the
compressors, coolers, furnaces, and boilers. It’s important to
look more closely at each of these sensors and their role within
HVAC systems as each have different differs functions from one
The Honeywell PX2 Series is designed to monitor performance and efficiency
in a wide range of potential industrial applications including HVAC/R equipment and air compressors.
When specifying sensors, consider quality, accuracy, consistency, ease of installation and replacement, and interoperability.
High-performing sensors help reduce the design costs, development, and testing cycle time. They’ll also require less frequent
calibration and replacement.
A sensor’s quality is indicated by the Total Error Band (TEB)
– one number that quantifies all possible errors, from the offset,
to the full-scale span, and pressure and thermal factors. The
lower the TEB, the more accurate the sensor and the less testing
and calibration it needs. If sensors are also made to Six Sigma
and ISO9001 standards, they will provide the highest level of
product quality, performance, and consistency.
Each type of sensor performs distinct functions in an HVAC
system. This article will look at heavy duty pressure transducers used in the heating and cooling source units.
Heavy duty pressure transducers
Higher pressure applications within HVAC systems – rooftop
cooling towers, boilers, pumps and chillers – require pressure
transducers that are durable, CE compliant, designed for IP69K
sealing protection, and able to withstand wide temperature
ranges and contact with harsh media (e.g., refrigerants, driving rains, hydraulic fluids, and compressed air up to 1000 psi).
With stainless steel housing and ports, these transducers can
minimize moisture infiltration and shorts at the sensor location,
and in turn, downtime and replacement costs.
Heavy duty pressure transducers provide two measurements:
1. The amount of pressurized air being delivered to the
2. The presence of air pressure leaks
These measurements come from continuously monitoring the
pressure of the compressor outlet, chiller outlet, evaporator coil
outlet and the cooling tower supply, ultimately providing data
to regulate the flow of heating/cooling media during partial load