CN203249886U - Detection device for water activity of food - Google Patents
Detection device for water activity of food Download PDFInfo
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- CN203249886U CN203249886U CN 201320277776 CN201320277776U CN203249886U CN 203249886 U CN203249886 U CN 203249886U CN 201320277776 CN201320277776 CN 201320277776 CN 201320277776 U CN201320277776 U CN 201320277776U CN 203249886 U CN203249886 U CN 203249886U
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- water activity
- food
- air flue
- calibrating installation
- temperature
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Abstract
The utility model relates to a detection device for water activity of food, and belongs to the technical field of food detection apparatuses. A detection device for water activity of the food is characterized by including a circulating air flue (1), wherein the circulating air flue (1) is provided with an air blower (3) arranged in the passage direction of the circulating air flue (1) , and an air inlet (9) with the adjustable opening degree is formed in the rear side of the air blower (3); a humidifying device (2), a temperature and humidity sensor (4) and a measuring chamber (5) are further arranged in the circulating air flue (1), and a temperature measuring device (6) is arranged in the measuring chamber (5) and is used for measuring the temperature difference between air flow and the surface of the to-be-detected food. According to the detection device for the water activity provided by the utility model, the measurement is performed quickly, the water activity of the surface of the to-be-detected material, even the water activity of the local points with small sizes can be measured, and the to-be-detected material is not required to be broken, so that the device can be applied to nondestructive examination, and the device has excellent application prospects in the fields of processing, storage, quality and safety of food.
Description
Technical field
The utility model relates to a kind of food water activity calibrating installation, belongs to food calibrating Instrument technology field.
Background technology
Water activity is the important parameter of food, with the processing of food with store closely relatedly, can be used for equally safety and the resting period of expression food, thereby in food security important meaning be arranged.Present assay method is static gas-liquid balance method, by material being placed in the airtight container, reaches balance by the moisture evaporation, measures vapour pressure or the water loading of the air of moisture and asks for water activity.Its way of realization has multiple conductance, specific inductive capacity, density, the weight change etc. of comprising.But its essence is identical, all is steam partial pressure or airborne steam vapour amount after the mensuration balance.Because balance needs generally to want at least 30 minutes for a long time, thereby the mensuration process is bothersome, and can only measure the mean value of material, and the part in the material can't accurately be described, or less surface, even certain any water activity.
Summary of the invention
The utility model technical issues that need to address are: existing very activity calibrating installation, all be based on after the moisture evaporation reaches balance in the closed container, and the vapour pressure of mensuration moisture or the method that water loading of the air is asked for water activity design.Adopt this water activity calibrating installation, just can test after needing to wait for the moisture vapor balance, waste time and energy, and can't detect the water activity of material part.
The utility model aims to provide a kind of food water activity calibrating installation, solving the problems of the technologies described above, and takes following technical scheme:
A kind of food water activity calibrating installation comprises circulation air flue 1, and described circulation air flue 1 is provided with blower fan 3 along its channel direction, and described blower fan 3 rear sides are provided with the adjustable air inlet of aperture 9; Also be provided with damping device 2 in the described circulation air flue 1, Temperature Humidity Sensor 4, measuring chamber 5 is provided with thermopair 6 in the described measuring chamber 5, and described thermopair 6 is measured the temperature difference of air-flow and food surface to be examined and determine.
The utility model provides a kind of quick, Accurate Determining material surface, even different piece in the material, comprises the water activity measuring method of very little area point, and material does not need to carry out fragmentation.And provide a kind of realization above-mentioned surveying instrument.
At first portion of air is carried out humidification, then by regulating the aperture of air inlet, the air that mixes different proportion reaches the purpose of regulating different humidity, with soft air and Food Contact, can reach the constant temperature difference through dynamic damp and hot exchange soft air and food surface, measure this temperature difference, measure simultaneously the temperature and humidity of soft air.Air with different humidity is measured, and obtains the different temperature difference, and then to calculate the temperature difference be 0 o'clock relative air humidity, obtains the numerical value of water activity.
This determinator does not need to adopt reference material to demarcate when detecting, measuring accuracy reaches 0.01Aw.If temp measuring method adopts thermopair, can realize point measurement.Measuring process does not need broken material, does not destroy material result and character, thereby can be used as using at line method of Non-Destructive Testing.
Also comprise a pair of adjusting knob 7, described a pair of adjusting knob 7 is regulated respectively the aperture of described air inlet 9 and the rotating speed of described blower fan 3.
Also comprise display screen 8, described display screen 8 shows the numerical value of described water activity.
Described air inlet 9, blower fan 3, Temperature Humidity Sensor 4, measuring chamber 5, damping device 2 is in described circulation air flue 1 interior order setting.
Described circulation air flue 1 is rectangular.
Described temperature measuring equipment 6 is thermopairs.
The beneficial effects of the utility model are:
1) process of instrument water activity only needs 3-5 minute, and is fast, easy.
2) can measure material to be detected surface, even the water activity in the local facet plot point.
3) need not broken material to be detected thereby can be used as the application of Non-Destructive Testing.
4) measuring accuracy is up to 0.01Aw.
5) at the food processing storage, there is good application prospect in the Food Quality and Safety field.
Description of drawings
Fig. 1 is the structural representation of the utility model food water activity calibrating installation.
Wherein 1, the circulation air flue, 2, damping device, 3, blower fan, 4, Temperature Humidity Sensor, 5, measuring chamber, 6, thermopair, 7, adjusting knob, 8, display screen, 9, air inlet.
Embodiment
Below in conjunction with specific embodiment the utility model is further specified.
Referring to Fig. 1, a kind of food water activity calibrating installation comprises circulation air flue 1, and circulation air flue 1 is provided with the adjustable air inlet of aperture 9, blower fan 3, Temperature Humidity Sensor 4, measuring chamber 5, damping device 2 successively along its channel direction.Measuring chamber 5 interior placements material to be measured, and measure respectively the temperature on air-flow and material surface with thermopair 6, thus the temperature difference of obtaining.By repeatedly measuring, obtain the different above-mentioned temperature difference, the relative air humidity when calculating the temperature difference again and being zero obtains the numerical value of water activity.
Adjusting knob 7 can be regulated respectively the aperture of air inlet 9 and the rotating speed of blower fan 3, thereby regulates air compensation and wind speed flow, obtains the air draught of different humidity.After measuring for several times, show as calculated the numerical value of water activity at display screen 8.
This method is measured the numerical value that fast, accurately only needs can obtain measuring in 3-5 minute material moisture activity, in fields such as food processing and storage, Food Quality and Safeties good application prospect is arranged.
Claims (6)
1. food water activity calibrating installation is characterized in that:
Comprise circulation air flue (1), described circulation air flue (1) is provided with blower fan (3) along its channel direction, and described blower fan (3) rear side is provided with the adjustable air inlet of aperture (9);
Also be provided with damping device (2) in the described circulation air flue (1), Temperature Humidity Sensor (4), measuring chamber (5) is provided with temperature measuring equipment (6) in the described measuring chamber (5), and described temperature measuring equipment (6) is measured the temperature difference of air-flow and food surface to be examined and determine.
2. water activity calibrating installation as claimed in claim 1, it is characterized in that: also comprise a pair of adjusting knob (7), described a pair of adjusting knob (7) is regulated respectively the aperture of described air inlet (9) and the rotating speed of described blower fan (3).
3. water activity calibrating installation as claimed in claim 1 is characterized in that: also comprise display screen (8), the numerical value of the described water activity of described display screen (8) demonstration.
4. water activity calibrating installation as claimed in claim 1 is characterized in that: described air inlet (9), blower fan (3), Temperature Humidity Sensor (4), measuring chamber (5), damping device (2) order in described circulation air flue (1) arranges.
5. water activity calibrating installation as claimed in claim 4, it is characterized in that: described circulation air flue (1) is rectangular.
6. water activity calibrating installation as claimed in claim 1, it is characterized in that: described temperature measuring equipment (6) is thermopair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320277776 CN203249886U (en) | 2013-05-21 | 2013-05-21 | Detection device for water activity of food |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320277776 CN203249886U (en) | 2013-05-21 | 2013-05-21 | Detection device for water activity of food |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203249886U true CN203249886U (en) | 2013-10-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 201320277776 Expired - Fee Related CN203249886U (en) | 2013-05-21 | 2013-05-21 | Detection device for water activity of food |
Country Status (1)
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| CN (1) | CN203249886U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237330A (en) * | 2014-10-10 | 2014-12-24 | 中国航空工业集团公司北京长城航空测控技术研究所 | Macromolecule thin-film capacitor oil moisture transducer calibration device and method |
| CN104237330B (en) * | 2014-10-10 | 2017-01-04 | 中国航空工业集团公司北京长城航空测控技术研究所 | Calibration device and method for macromolecular film capacitor oil-liquid moisture sensor |
| CN107632117A (en) * | 2017-09-11 | 2018-01-26 | 深圳冠亚水分仪科技有限公司 | A kind of measurement sensor of quick detection water activity |
| WO2021187974A1 (en) * | 2020-03-16 | 2021-09-23 | Kaak Groep B.V. | Device and method for the contactless measurement of the moisture content of a food product |
| CN114428029A (en) * | 2022-01-14 | 2022-05-03 | 南京师范大学 | Method and device for measuring liquid moisture absorption capacity |
-
2013
- 2013-05-21 CN CN 201320277776 patent/CN203249886U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237330A (en) * | 2014-10-10 | 2014-12-24 | 中国航空工业集团公司北京长城航空测控技术研究所 | Macromolecule thin-film capacitor oil moisture transducer calibration device and method |
| CN104237330B (en) * | 2014-10-10 | 2017-01-04 | 中国航空工业集团公司北京长城航空测控技术研究所 | Calibration device and method for macromolecular film capacitor oil-liquid moisture sensor |
| CN107632117A (en) * | 2017-09-11 | 2018-01-26 | 深圳冠亚水分仪科技有限公司 | A kind of measurement sensor of quick detection water activity |
| WO2021187974A1 (en) * | 2020-03-16 | 2021-09-23 | Kaak Groep B.V. | Device and method for the contactless measurement of the moisture content of a food product |
| NL2025143A (en) * | 2020-03-16 | 2021-10-20 | Kaak Groep B V | Measuring device and method for a contactless analysis of a food product in a production line |
| CN114428029A (en) * | 2022-01-14 | 2022-05-03 | 南京师范大学 | Method and device for measuring liquid moisture absorption capacity |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131023 Termination date: 20150521 |
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| EXPY | Termination of patent right or utility model |