I Work With Hygrometers Frequently In My Role As

You will not use much at a time, but hygrometers should be calibrated two times per year so it will be a worthwhile supply to have on hand. In essence, you are “teaching” the instrument to “recognize” a set humidity the next time it is exposed to it. You can go online and find hundreds of articles explaining the reasons for this and suggesting optimum readings for your particular climate.37%; LITHIUM CHLORIDE 11.80%; POTASSIUM CARBONATE 43. You want a damp sludge, not soup. Consumer quality hygrometers and/or relative humidity gauges are inexpensive and infamous for inaccurate readings.Detailed calibration procedures:With most professional instruments, it is recommended that they be calibrated at both a low point and a higher reference point.With most digital hygrometers, they must be calibrated with the power or display turned off. At the ideal temperature of 77 degrees Fahrenheit, this solution will produce an RH of 32. Then I commence with the manufacturer’s calibration procedures. So, to calibrate our instruments, we need to be able to place the device in our own custom “humidity chamber”. It takes that long for the solution to stabilize.51%; MAGNESIUM CHLORIDE 32. This allows both solutions to stabilize at the same time and to begin producing the RH you need. It is, for this reason, that the two lower calibration points, both readily apparent on the instrument’s display, have been established by manufacturers. Merely obtain a couple plastic jars, such as oysters or similar foods come in, and drill holes in the lids so they provide a snug fit for the sensor on your instrument. Put a few tablespoons in the yogurt container and add distilled water to form a slurry. Morton canning salt from a grocery store is such a salt and it is inexpensive.30% and at 86 degrees Fahrenheit it will produce 32. So, once the solution has set for 12 hours and the reading has obviously stabilized, I turn the unit off. Typically this involves pushing in, with a paperclip or a similar object, a recessed button and other controls in a set order. If not, put your hygrometer in one jar lid and a piece of tape or a seal of some type over the other one so the RH will stabilize. It is, also, used as a de-icer. The humidity created, with ordinary salt (Sodium Chloride) and water, is 75. I cut the tops off, so they are about two inches high, and cut a recessed area so the hygrometer can rest with the sensor over the solution without it being in direct contact with the wet solution.Simplified scientific explanation:A saturated solution at a stable temperature and pressure has a fixed composition and a fixed vapor pressure.29% at an ideal temperature of 77 degrees Fahrenheit. (Do not buy a magnesium + chloride supplement at a health food store – wrong product. Typically, with a mechanical unit, it is only the 75% reading that is tested.00.30%; POTASSIUM ACETATE 22.09%. Complete the second calibration and you are done for six months!Note: If you wish to test the overall accuracy of your instrument, other salts can produce many different RH levels.) Mix the Magnesium Chloride Hexahydrate with distilled water, the same way as was described above, and follow all the same procedures. With the Ziploc bag, you can see the hygrometer reading and the controls so it is a simple matter to punch a tiny hole in the bag with the paper clip and calibrate the instrument without interfering with the relative humidity that has been created. One problem with this is, if the instrument is set to read too high, and it shows a reading.