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*New and improved version is the Uniweld NV1 Nitrogen Flow Indicator* Uniweld UNF3 Nitrogen Flow Indicator provides extremely low pressure precision gas flow control for nitrogen purging applications during the brazing of copper tubing in Air Conditioning and Refrigeration systems. The nitrogen must be flowing to displace the oxygen inside the tubing during the brazing process, preventing internal oxidation and the resulting scale. Scale build up inside the tubing can cause blockage in the TXV and within the Air Conditioning and Refrigeration system resulting in premature failure. The UNF3 Nitrogen Flow Indicator uses a float ball to visually confirm the nitrogen is flowing and allows the technician to first flush the copper lines at 25-35 CFH and then reduce the flow to 3-4 CFH during the brazing process thus conserving and saving nitrogen. If the ball does not rise in the tube there is no flow of nitrogen only static pressure and oxygen is not being displaced. The UNF3 maximum inlet pressure is 50 PSI and must be connected to a Nitrogen Regulator with 1/4 inch male flare outlet connection (Uniweld Part No. RHP400, RHP500, RHP800 - Sold Separately) to control the nitrogen gas pressure.
From the Manufacturer
Uniweld UNF3 Nitrogen Flow Indicator provides extremely low pressure precision gas flow control for nitrogen purging applications during the brazing of copper tubing in Air Conditioning and Refrigeration systems. The nitrogen must be flowing to displace the oxygen inside the tubing during the brazing process, preventing internal oxidation and the resulting scale. Scale build up inside the tubing can cause blockage in the TXV and within the Air Conditioning and Refrigeration system resulting in premature failure. The UNF3 Nitrogen Flow Indicator uses a float ball to visually confirm the nitrogen is flowing and allows the technician to first flush the copper lines at 25-35 CFH and then reduce the flow to 3-4 CFH during the brazing process thus conserving and saving nitrogen. If the ball does not rise in the tube there is no flow of nitrogen only static pressure and oxygen is not being displaced. The UNF3 maximum inlet pressure is 50 PSI and must be connected to a Nitrogen Regulator with 1/4 inch male flare outlet connection (Uniweld Part No. RHP400, RHP500, RHP750 – Sold Separately) to control the nitrogen gas pressure.
Ken
Reviewed in Canada on January 20, 2025
This product is great, it is very easy to calibrate the amount of nitrogyn u are using.
Saul Diaz
Reviewed in the United States on February 1, 2024
Estoy muy agradado por este producto tal como lo pedí me llego , y a buen tiempo de entrega .
Avid Reader
Reviewed in the United States on August 11, 2023
I tested the flow of this meter and based on the flow rate, the time elapsed, and the amount of N2 in the tank, I found instead of 15 lpm flowing as the float ball indicated, it was actually about 6.5 lpm. I talked with a representative at Uniweld about this issue. They deflected my concern and basically said, for brazing, you just need a little N2 flow, it is irrelevant how accurate the meter is. I would not buy this meter with it being so far out of reality. Waste of my money. I'll be looking for a meter that is accurate, not misleading. I also calculated the actual flow when the meter was reading 30 lpm ... 10.3 lpm. When meter was reading 35 lpm, actual flow was 12.2 lpm.
Jane Doe
Reviewed in the United States on July 8, 2023
Regulates amount of nitrogen flow when vacuum down a/c units for leaks
Oscar De Luna
Reviewed in Mexico on August 24, 2022
Llego rápido en buen estado lo uso para ajustar el flujo de nitrógeno en soldadura
MC
Reviewed in Canada on September 10, 2020
Essential for controlling nitrogen flow while brazing ac lineset.Very pleased.
Osters p.
Reviewed in Canada on July 5, 2020
It works fine
Christopher Allan
Reviewed in Canada on March 18, 2019
So far use as intended. Works fine.
CRS
Reviewed in the United States on August 6, 2017
Works as described, with the price of gasses rising and the necessity ,for brazing with nitrogen as a page not going away anytime soon, this unit keeps you in line not wasting gas, and with its indicator ball floating on a stream of gas while in use, theres no more guessing if its actually purging your lines.
Keith Adelbai
Reviewed in the United States on July 22, 2016
Does what It supposed to do!First timers, when you get a Nitrogen Tank, please don't forget this paired to a Nitro Regulator of your choice. It'll save you a lot of nitrogen for longer lasting stock management.THIS TOOL IS A MUST!!!
ToolmanJohn
Reviewed in the United States on February 27, 2015
It works, but I wish the CFM range was actually smaller. At a low flow rate of 2-3 CFM (recommended for brazing line sets while flowing nitrogen) the indicator ball floats barely above the bottom of the scale. It actually won't rise above the lowest part of the brass body, although you can look down into the clear tube and see it float at very low output.This is basically a flow valve, not a pressure regulator.
Ralph H.
Reviewed in the United States on January 26, 2015
Well made and works perfect. Price was reasonable. I will buy another one to have as a back up.
Johnny Tejada
Reviewed in the United States on February 10, 2014
Very handy tool works well I like the kit I would recommend this item.the delivery was fast and its good quality.
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