my bhogart gauges are trash, all marked with sharpie lines now. I went on a quest for fittings and ended up at napa auto, saw they carry many pressure gauges, you may want to give them a shot
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get guages with a stainless socket and tube, you dont want mild steel or brass.https://www.bestvaluevacs.com/glycerin-filled-compound-gauge-w-1-4-npt-base.html?gclid=EAIaIQobChMIyLquqoKY3wIVioZ-Ch033A-jEAQYCCABEgKf9_D_BwE
get the non glyceryn filled model, you can freeze the glycern with dryice accidently.
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Corlee valve company also will have good quality guages for a good price, too.
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Direct Material
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Those are some good prices. Low quality, though, which is the problem with the nhogart ones, too.
Corlee carries everything from swage on down to fit your budget. Hoses, valves, guages and more. He caters to this industry.
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IMO you are vaporizing VOCâs and water at the low pressure. If this is true with your set up, you will see a deeper vacuum the colder your material / column is regardless of the amount of material in it.
Terpenes will vaporize easily at low pressures as will water content in the material. To get these values look up vapor pressure charts (pressure vs. temp) of the constituents in concern namely water and terpenes. The more material in your column the more are present. Once the pump vaporizes (âboilsâ) them all off you will see the gauge go deeper. Although, this is not a recommendation unless you are trying to remove VOCâs (terpenes) from the material.
A method to determine if this is whatâs happening and what may be pulling off is to put a low temp cold trap between your column and your vacuum pump while evacuating the column. The VOCâs youâre vaporizing (if present) will re-condense in the trap (assuming the trap has adequate surface area, heat transfer, and temperature for the vacuum level) before they enter your pump.
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