I have a coltri mch6 compressor, serviced (by me) less than 6 months ago. Since then it had worked approx. 10 hours.
Some inside components were worn and replaced during service (crankshaft, stage 1 segments, stage valves, overpressure valve), it was completely disassembled and washed of old oil and contaminants. Of course, new oil and filters were installed (from manufacturer).
Few days ago I decided out of curiosity to measure the humidity of the air produced with this compressor. For this purpose I used a 4 liter steel tank, filled from this compressor, connected to a 1st stage and a hose without 2nd stage inserted in a plastic bag. Inside the bag is a humidity meter, this one: ST-321 - UNBRANDED - HYGROMETER, THERMO, DIGITAL | Farnell element14
The procedure was simple, blowing air inside the bag for approx 1 minute, at moderate pressure, then extracting hose (while still blowing) allowing as less as possible air from outside, then zip close the bag. The readings were taken after another 1-2 minutes.
First test was surprising, 20% humidity. From what I have read here about humidity in compressor air, I expected a lot less. My first thought was that the filter had saturated somehow after 10 working hours (out of ~50, as indicated by manufacturer) at approx. 15-20 celsius degree temperature, even if I do not live in a particulary humid area. The filter looks correctly installed, the sealing oring on the filter looks ok. I do not think that airflow is bypassing the filter.
After that, I made another test. I have another filter, brand new, sealed in its original plastic bag. I opened it and installed it, then another 4L tank was purged then filled to approx. 170 bar. Repeating the same test, I got around 15% humidity.
Now I am puzzled and I do not understand why the humidity is so high. Unfortunately I do not have another humidity meter to double check the readings.
I also weighted the filters, the old one has 120,28 grams, the new one (after the first fill) has 108,77 grams.
Any idea? Thanks in advance.
Some inside components were worn and replaced during service (crankshaft, stage 1 segments, stage valves, overpressure valve), it was completely disassembled and washed of old oil and contaminants. Of course, new oil and filters were installed (from manufacturer).
Few days ago I decided out of curiosity to measure the humidity of the air produced with this compressor. For this purpose I used a 4 liter steel tank, filled from this compressor, connected to a 1st stage and a hose without 2nd stage inserted in a plastic bag. Inside the bag is a humidity meter, this one: ST-321 - UNBRANDED - HYGROMETER, THERMO, DIGITAL | Farnell element14
The procedure was simple, blowing air inside the bag for approx 1 minute, at moderate pressure, then extracting hose (while still blowing) allowing as less as possible air from outside, then zip close the bag. The readings were taken after another 1-2 minutes.
First test was surprising, 20% humidity. From what I have read here about humidity in compressor air, I expected a lot less. My first thought was that the filter had saturated somehow after 10 working hours (out of ~50, as indicated by manufacturer) at approx. 15-20 celsius degree temperature, even if I do not live in a particulary humid area. The filter looks correctly installed, the sealing oring on the filter looks ok. I do not think that airflow is bypassing the filter.
After that, I made another test. I have another filter, brand new, sealed in its original plastic bag. I opened it and installed it, then another 4L tank was purged then filled to approx. 170 bar. Repeating the same test, I got around 15% humidity.
Now I am puzzled and I do not understand why the humidity is so high. Unfortunately I do not have another humidity meter to double check the readings.
I also weighted the filters, the old one has 120,28 grams, the new one (after the first fill) has 108,77 grams.
Any idea? Thanks in advance.