Air Velocity Transmitters

Air Velocity Transmitters
Air Velocity Transmitters measure air velocity or volumetric flow in imperial or metric units. There are models for 3% or 5% accuracy.
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  1. SERIES AVU AIR VELOCITY TRANSMITTER
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    Air Velocity Transmitter ideal for a wide range of HVAC measurement an ...
    Starting at $249.00
  2. SERIES AVUL AIR VELOCITY TRANSMITTER
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    Air Velocity Transmitter accurate and available for a variety of nee ...
    Starting at $193.00
  3. SERIES AVLV AIR VELOCITY TRANSMITTER
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    Air Velocity Transmitter quickly and accurately measures air velocity ...
    Starting at $277.00
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Questions

Question
We have recently replaced a Dwyer air velocity transmitter (PFS1300204) with a Dwyer Series 641. The new sensor works fine for only a few days and then starts reading almost no flow. These devices are used in an Air Scrubber application (exhaust stack). Is this the right application for the Series 641? I suspect that moisture might be the issue, but I cannot confirm.
Answer
I do not think you are using the 641 series air velocity transmitter in an appropriate application. Any moisture or particulates in the exhaust could be causing damage to the hot wire sensor, leading to the failure. The difference in the sensors is probably why you got longer life out of the PFS series, which unfortunately, is no longer available. The PFS series used a glass filled polyester sensor, which is a little more robust and can with stand the elements a little better. In your specific application, you might take a look at our 641B series which uses a heated mass flow sensor which can be used in dirty air environments.
Question
Is there a minimum duct size that this sensor can be used in?
Answer
The sensing element is about ¾” from the tip of the stem so the duct size would need to accommodate the entire sensing element. If being used in a smaller duct, you will want to verify that the flow range is within the operating range, 1000, 2000, 3000, or 4000 FPM.
Question
Can you use a display with the Modbus or BACnet options?
Answer
Yes, either the integral LCD Display, A-AVUL-LCD, or the remote display tool, A-435-A, can be used with Modbus or BACnet configurations.
Question
Is there a minimum duct size that this sensor can be used in?
Answer
The sensing element is about ¾” from the tip of the stem so the duct size would need to accommodate the entire sensing element. If being used in a smaller duct, you will want to verify that the flow range is within the operating range, 1000, 2000, 3000, or 4000 FPM.
Question
Can the AVPT output volumetric flow readings
Answer
No, the AVPT is configured to output air velocity readings in FPM or M/S only. Consider looking at the AVUL for a unit able to output volumetric air flow.