Infrared Non Contact Thermometer

infrared thermometer reading

Finally, after several previous failed attempts. I placed my order and it arrived in good working condition. It was not because I don’t had budget, but I was doubtful that it wouldn’t be useful enough.

infrared thermometer reading

It is a non contact IR (infrared) Thermometer. The device resembles a gun with a shortened barrel. Of course, they should not design it close to the real thing. To use, simply point it to material of interest. Press the trigger and keep it pressed to scan and release and get the final reading. It is the last reading that is registered, not the average of scanned readings. Expensive brands might have that function. It is wise to read the description carefully before placing order.

Before, I was using a dial-probe type. I need to deep it to mixture every time and wait a minute or so for the dial to travel and stabilize. It was taking a while and the probe should be wiped off clean after. It has contamination risk if the paper towel is not sterile. Oh! It is by nature a contaminant. Accidental shreds might go into food of concern.

I know it reads temperature by infrared. However, I never fully understand the mechanism.

It has red laser beam so the user can ensure he is pointing to the right surface. The sensor is underneath, deep down a wider hole.

It measures surface temperature value. It is not ideal to use on non homogeneous mixture. It cannot be used in lieu of of oven thermometers. It will give the temp value of metal and not the inside air.

In terms of GMP, non contact is one of the best measure. Measuring parameters with very minimal intervention, to point of operating a machine using a remote control.

I am using it for chocolate tempering and molding. I found it very convenient, quick and reliable. I should have bought it earlier. The time when I was starting to practice tempering. The number of mistakes I made and the long learning period could have been reduced significantly.

Informal Drying Lessons

Hardcore drying involves complex mathematical calculations. But, the following are just simple tips. Do not worry!

1) Surface area matters. The more surface area the faster the drying time will be. Some practices to increase surface area are slicing, chopping and pulverizing. That is if particle size reduction is allowed or is the normal product requirement.

2) Heat. Higher temperature drives moisture away faster. It is but normal to use the maximum heat possible that is not detrimental to product quality. E.g. If mango slices turns brown at 90C, then the machine operator should try lowering the temperature as to maintain the yellow color.

3) Layering. I mean how the commodity is arrange on trays. Crushed ginger when arranged on trays 10 mm thick will dry faster than 20 mm thick arrangement. A simple theory but we often put thicker layers to load more at time thinking work could be faster.

drying cracked corn4) Air flow. If the commodity being dried is in enclosed system or a system with a very minimal air exhaust, the result is a slow drying when the moist in air became saturated. There must be an efficient way to take-in dry air and expel out moist air. Note that you can dry any commodity by using moving air alone. The best scenario is clipping your wet socks on rotating fan.

5) Rest. Surface moisture could be removed easily with combination of heat and good airflow. However, the inner moisture is not. Especially true for grain commodities. A good trick here is turning off the drying machine after an hour or two. Allowing the inner moisture to travel to surface. Then continuing the drying process. This may not result in faster drying time but to a more cost effecting drying.

6) Heat source. They said far infrared heat is more effective than convection heating. This heat source acts on food commodity directly. When struck with  infrared wave, the molecules rotate causing rapid heat build up and driving away of moisture. The only major drawback is the high energy cost of powering up the infrared heat source. The common around is ceramic type.