![]() My apologies, I thought I posted this yesterday I will take the liberty of expanding on shogoth43’s post. I do think with a quality control valve, and the Fabco may well be such, that your vernier mod ought to keep you in the proverbial ballpark. I do not know how good the answer is, I hope it helps. ![]() The rotameters and various other flow meters are good for a reasonable level of manual control, for that matter, I am sure that with the given alarms it would not be difficult to incorporate them in an automated system. Ultimately, Mass flow controllers are the answer. This is why Tom Barr said, “Mass flow controllers are much better.” ![]() To be fair I have been seeking a ridiculous level of precision and consistency of delivery beyond that of any reasonable needs of a weed grower. Returning to a precise setting, it seems involves variables for which marking a spot on the knob does not account. I had tried using Ideal 52-1-12 Needle valve which is an excellent hobbyists control valve and a ridiculously expensive “laboratory grade” valve. My experience suggests not, since there is no feedback as to the actual volume of gas. There are some really cool (Uh-Oh old codger speak)and "relatively" cheap digital flow meters, I hear folks refer to them as "rotameters." Maybe I am a purist or some old gasbag, but I like the traditional "rotameter" that I can see across a room things are working.Ī good question, I wish I had a good answer. What I described as an 8 port "rotameter" is properly a mass flow controller. The lines tend to blur between the various types of flow meters and controllers. Will you need adapters? That sort of thing.Ī Left C kind of person is the sort that really ferrets out deals and understands the difference between junk and a real deal. Learn about the thing you are looking for and of course, what they cost new, out of the box. The internet is good, but the phone and email are your best friends. Once people know you are looking (and you will buy) “deals” tend to come to you. Look for places going out of business, upgrading equipment, folks retiring. Look around and you might find some real deals, just make sure they are designed for, or can be adapted to your task, CO2 in this case. Relative to bubble counters, rotameters are expensive. I wish to be clear, no hobbyist “needs” a rotameter and “reasonably priced” is a relative term. I have a number I have picked up over the years cheap and I now have a fancy-schmancy test bench variety that allows me to monitor, measure and record 8 operations at once. It is relative, once you are happy, that is your calibration.įlow meters went in my off-limits buckets a while back. They can be had fairly cheap, it really depends on how much calibration you require, contrary the opinion of the intelligentsia, I do not think there is much need. I like the fact I can see the process and sighting is easy. I love the fact that once you find a setting it is easy to get back to where you started, if like me you like to try things. Where they shine in this evil plant monster, ever-humble opinion is in replication. Rotameters give a reasonable idea of at least relative flow, particularly at lower flow rates still do not till us much about effective use. The large dual display allows you to simultaneously read air velocity or airflow, and air temperature (☏/☌).Bubble counters are really poor measures of CO2 flow, bad indicators of effective use and even worse devices for replication. The instrument will help you meet cooling and environmental requirements for safety and comfort. Browse >100,000 products at Digi-Sense™ Precalibrated Compact Vane Anemometer Lightweight and pocket-sized for convenient field use Airflow Measurement Digi-Sense™ Precalibrated CFM/ CMM Vane Thermoanemometer Get high precision with large backlit LCD and data storage - Reliable measurements, guaranteed! Precalibrated to NIST-traceable standards - Backlight sensor is automatically activated by low-light conditions - Max/Avg functions to easily manage airflow measurement Reliable measurements, guaranteed! Precalibrated to NIST-traceable standards User-selectable units of measure eliminate the need for conversion - User-selectable units of measure eliminate the need for conversion Digi-Sense™ Precalibrated Data Logging Anemometer Be more versatile-handheld or mountable Two memory locations, one CMM and one CFM, store commonly used vent area sizes to save you time Large dual-function 4-digit LCD with backlight for easy reading Auto power-off extends battery life Fits comfortably in your hand The Digi-Sense CFM/CMM vane thermoanemometer is designed for precision air velocity and airflow measurements in seven user-selectable units of measurement (ft/min, m/s, mph, km/h, knots, CFM.
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