Cohiba Stevie Posted July 19, 2012 Share Posted July 19, 2012 So i have a hygroset digital hygro in my humidor and im trying to calibrate it at the minute... Ive got a boveda humidipak calibration kit which is easily the most recommended way of calibrating a hygro on the net. The thing is, im supposed to adjust the hygro one point up or down for every percentage over or under 75% rh. Well my hygro is currently reading 81% in the calibration kit so this means i will have to adjust the hygro by minus 6 points. The maximum the hygro will allow to adjust is plus or minus 10 points... What happens in 6 months time if my hygro needs re adjusted further? So if the switch is already at -6 that means i only have 4 % to play with? Surely i have got this wrong? Am i supposed to move the switch back to the neutral position after calibration? Thanks for any help folks. Link to comment Share on other sites More sharing options...
CanuckSARTech Posted July 19, 2012 Share Posted July 19, 2012 Yes, generally before any calibration, it's best to reset any digital units by adjusting back to a zero on the dial, and/or removing the battery for a minute or two. Then, you'd start the 24-hour recalibration cycle again. It may all depend on the individual digital hygrometer's manufacturer's instructions, but that's generally the route. Link to comment Share on other sites More sharing options...
Colt45 Posted July 19, 2012 Share Posted July 19, 2012 My simplistic view is I'd (and in practice do) just remember (or mark on piece of tape etc) how far the hygro is off. Here's one of my favorite calibration discussions on the net: Link Link to comment Share on other sites More sharing options...
PigFish Posted July 20, 2012 Share Posted July 20, 2012 Your meter is either measuring potential (voltage) or current off the sensor. FIRST.... Put in a new battery! Test again! The adjustment is just a means to vary the voltage or the current through the sensor to calibrate the logic for the display. Depending on the circuitry of the hygrometer, your calibration my vary as the potential from the battery does over time. Lets say that you adjust the flow on a faucet to deliver a certain amount of water per minute. If you go out and adjust the pressure regulator outside then the flow rate inside on the faucet will also change. The adjustment for calibration is the faucet and the battery is the regulator. Start with a new battery and adjust from there or just make a card as Ross suggests to remind you what to add or subtract to the display and assume that the variance is linear. Sensors suffer from pollution. These sensors don't last forever. Furthermore they are not linear in reality. Just because you got it to read right at 75 RH does not mean that it will read correctly at 65 RH. JFYI. High quality commercial sensors can cost hundreds of dollars! These battery powered economy desk units are commonly off 6 or more percent. If you can adjust out the 6% and your cigars smoke well... What more can you ask for??? Good luck! -Piggy Link to comment Share on other sites More sharing options...
al321 Posted July 20, 2012 Share Posted July 20, 2012 I just had the same problem and, after reading the instructions, realized I wasn't pushing the reset button after calibrating. It's the little recessed button. Also, you don't move the switch back to neutral after calibrating. Link to comment Share on other sites More sharing options...
GernBlansten Posted July 20, 2012 Share Posted July 20, 2012 My simplistic view is I'd (and in practice do) just remember (or mark on piece of tape etc) how far the hygro is off. Here's one of my favorite calibration discussions on the net: Link That's a solid read! Those Oregon Scientific sensors are really cool! Thanks! Link to comment Share on other sites More sharing options...
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