UNI-T UT366A with Pitot Tube vs Vane Anemometer for HVAC Testing Malaysia

Both a digital manometer with a Pitot tube and a vane anemometer can be used for HVAC airflow testing. However, they measure airflow differently and are suited to different test locations.

The UNI-T UT366A is primarily a digital manometer for gauge-pressure and differential-pressure measurement. When connected to an optional Pitot tube, it can also measure air velocity inside a duct.

A vane anemometer measures air velocity directly as airflow rotates its impeller. It is commonly used at grilles, diffusers and open air outlets.

Main Difference

The correct choice depends mainly on where the airflow needs to be measured.

Measurement requirement	UT366A with Pitot tube	Vane anemometer
Differential pressure	Suitable	Not normally available
AHU filter pressure drop	Suitable	Not suitable
Duct static pressure	Suitable	Not suitable
Air velocity inside a duct	Suitable	Possible with sufficient access
Air velocity at a grille	Less convenient	Suitable
Air velocity at an open outlet	Less convenient	Suitable
Measurement in a narrow access hole	Suitable	Usually difficult
Air-volume calculation	Requires duct area	Depends on model and outlet area

When to Choose the UT366A

Choose the UNI-T UT366A when pressure measurement is the main requirement.

Typical applications include:

AHU filter pressure-drop testing
Supply and return duct-pressure measurement
Positive and negative room-pressure checks
Fan inlet and outlet pressure measurement
Industrial ventilation inspection
Air-velocity measurement inside a duct with a Pitot tube

The UT366A measures up to ±15.00 kPa with an accuracy specification of ±0.5% full scale at 25°C. It supports multiple pressure units and provides independent P1 and P2 measurements.

This makes it a more versatile option when technicians need to check both air pressure and duct velocity using one instrument system.

When to Choose a Vane Anemometer

Choose a vane anemometer when the main task is taking quick air-velocity readings at accessible outlets.

Typical applications include:

Air-conditioning grilles
Supply-air diffusers
Exhaust outlets
Cooling fans
Open ventilation points
General environmental airflow checks

The rotating vane is placed directly in the airflow. This normally makes the instrument easier to use at an open outlet than a Pitot tube.

Some vane anemometers can also calculate air volume after the duct or outlet area is entered. The available functions depend on the individual model.

Measuring Inside a Duct

For measurements inside a closed duct, the UT366A with a Pitot tube offers an important advantage: only a relatively small access opening is required.

The compatible UNI-T Pitot tube measures approximately:

350 mm in length
8 mm in diameter
Manufactured from 304 stainless steel

The Pitot tube can be inserted through a test hole and moved across multiple points inside the duct.

A vane anemometer requires a larger opening because the complete vane head must enter the airflow. This may not be practical when the duct has limited access.

Measuring at a Grille or Diffuser

A vane anemometer is usually more convenient at an air-conditioning grille because its sensor can be placed directly in front of the outlet.

Using a Pitot tube at a grille is more difficult because:

Air direction may vary across the grille
The airflow may be turbulent
The pressure difference may be low
Correct alignment is harder to maintain
The grille changes the airflow pattern

For this application, a vane or suitable hot-wire anemometer is generally easier to position.

Differential Pressure Capability

This is the main advantage of the UT366A.

A conventional vane anemometer cannot normally measure:

Filter pressure drop
Room differential pressure
Static duct pressure
Positive or negative gauge pressure

The UT366A can handle these pressure-based HVAC checks even when air-velocity measurement is not required.

For facility teams maintaining AHUs, filters and ventilation systems, this can make the UT366A more useful than an airflow-only instrument.

Accuracy Depends on the Measurement Method

Neither method produces reliable results when used incorrectly.

For UT366A and Pitot tube testing, common issues include:

Pitot tube not facing the airflow
Pressure hoses connected incorrectly
Loose, blocked or damaged hoses
Testing too close to a bend or damper
Taking only one reading inside a large duct

For vane-anemometer testing, common issues include:

Vane not aligned with the airflow
Sensor not covering the outlet evenly
Uneven airflow across the grille
Holding the instrument too close to the grille
Using an incorrect outlet area for volume calculation

Multiple readings are usually required when airflow varies across the test area.

Which Instrument Should You Buy?

Choose the UNI-T UT366A with Pitot tube when you need:

Pressure and differential-pressure measurement
Filter pressure-drop inspection
Duct static-pressure testing
Air velocity inside enclosed ducts
Access through a small test opening

Choose a vane anemometer when you mainly need:

Quick air-velocity checks
Measurements at grilles and diffusers
Fan or open-outlet testing
Simple airflow inspections

Some HVAC contractors may need both instruments because they serve different measurement points.

HVAC Testing Support in Malaysia

The correct instrument depends on the air system, access point, expected velocity and whether pressure measurement is required.

For help choosing between the UNI-T UT366A, Pitot tube and an anemometer, contact MTM Precision with a photo of the measurement location and a short description of the intended application.

MTM Precision Sdn Bhd

Showroom & Service Centre:
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia

Tel: 03-8080 7172
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
Website: www.mtmpre.com.my