CN2067832U - Quality measurer for frying oil - Google Patents
Quality measurer for frying oil Download PDFInfo
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- CN2067832U CN2067832U CN 89203606 CN89203606U CN2067832U CN 2067832 U CN2067832 U CN 2067832U CN 89203606 CN89203606 CN 89203606 CN 89203606 U CN89203606 U CN 89203606U CN 2067832 U CN2067832 U CN 2067832U
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- frying oil
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Abstract
The utility model discloses quality measurer for frying oil used for measuring the quality of frying oil, which is characterized in that the utility model adopts an especial plane sensor and a temperature compensation corrective action to simplify the prior test work for the frying oil. The utility model is of one man operation, which can rapidly test the quality of the food frying oil at any time. The utility model is a helpful tool for food hygiene examination.
Description
The utility model is a kind of a kind of instrument that is used to test frying oil quality quality, belongs to the application of electronic technology aspect the grease test.
As everyone knows, be used for the frying process of the edible oil of fried food at high temperature, its quality can change, and after its qualitative change is arrived to a certain degree, can produce the material harmful to the person, at this moment, if the edible food that exploded is hundred evils and none profit to the person undoubtedly.Therefore, the qualitative change situation of test frying oil after using is of great practical value.All act on physical chemistry method in past people and test, but its test speed is slow, operation is limited by working environment, and tests the expense costliness one time.Other sees, publish in " JAOCS " magazine the 63rd volume, on 1986 the 8th phases, be entitled as in " Changes in Physical and Chemical Properties of Shortenings Used for Commercial Deep-Fat Frying " article, putting down in writing a kind of " oil quality detector (FOS) " can carry out quality inspection to frying oil automatically, but details such as the principle of work of this instrument and method for production are not all revealed.In addition, do not see have a kind of this functional tester to come out as yet on the market at home.
The purpose of this utility model is to provide a kind of can test the electric test device of frying oil quality quality fast.
The utility model tester, be according to frying oil under different situations, its dielectric coefficient and electric capacity, the principle that conductivity is different design.
Accompanying drawing 1 is the theory diagram of this testing tool.
Below the utility model branch is further described.
One, high-frequency signal source and isolating transformer
Two, alternating current bridge
Accompanying drawing 3 is the circuit diagram of this part.This electric bridge is the metering circuit part in this tester.It forms two arms respectively by two fixed condenser C10, C11 through shielding; Two arms are made up of sensors A and adjustable condenser C in addition.Capacitor C 0 value in parallel with C is that 1.45PF～1.55PF is the comparatively crucial part in the test circuit.When not putting into the sample Shan in the sensors A and under the state that K switch disconnects, to make meter pointer be zero by regulating C.Make meter pointer deflect into maximum scale by logical C0 again, if at this moment put into one-level sample oil in big sensor A, the test indicator can be got back to the zero graduation place, and promptly capacitor C 0 is equivalent to the one-level sample oil capacitance that it had in sensor.Therefore when the quality of oil changed, meter pointer again can be with zero maximum scale deflection, and this deflection is the electric capacity that is equivalent to one-level oil, and conductivity so be enhanced about more than once the sensitivity of this instrument.
Three, measuring-signal amplifier section
Accompanying drawing 4 is the circuit diagram of this part.It is made up of T5, T6 and T7, and T5, T6 play amplification, and afterbody T7 is an output stage., after amplifying, T5, T6 two-stage export through the measuring-signal behind the electric bridge by the emitter-follower that R25, T7 form; Promote display circuit at last.On the emitter-base bandgap grading of T6, added adjustable resistance to constitute Current Negative Three-Point Capacitance.Its effect is when by logical K switch, during C0 in parallel, by regulating this negative feedback, make meter pointer always keep on the maximum scale, so just guaranteed the precision of testing.
Four, detection and display circuit
Accompanying drawing 5 is the circuit diagram of this part.It is made up of the direct current table of diode rectifier circuit D1, D2 and capacitor C20 and 100 μ A.Last shows signal becomes the simulating signal that can represent the frying oil quality after rectification, after the demonstration of pointer reometer.
Accompanying drawing 6 is the floor map of this tester display dial.In this dial plate, according to prior try the arrangement the electric capacity that presented of frying oil under different temperatures, electrical conductance is drawn out temperature correction scale on the dial plate.When needle deflection is in mark " red line ", show that frying oil can also use, as exceed outside " green line ", show that then frying oil can not use, and should deal with.
Five, spiral fashion so electric capacity conductivity sensor
Accompanying drawing 7 is the planimetric map of this part.This sensor is a plane formula, and shape such as plate are thinner.The copper sheet bar becomes the bifilar helix formula to be satisfied with on the substrate disk, and with basic main frame integrator.When test, it is placed in the measured oil.
Accompanying drawing 8 is a complete circuit diagram of the present utility model.
Accompanying drawing 9 is external form of the present utility model (table body) synoptic diagram.(1) is the balancing knob among the figure, and (2) are biased witch, and (3) are the sensor jack, and (4) are power switch, and (5) are the decay adjusting knob, and (6) are the machine zero knob, and (7) are dial plate.
The utility model tester, through prototyping testing, every performance index all reach designing requirement.And good operating stability, practical reliable.
Claims (6)
1, a kind of frying oil quality tester, it is characterized in that producing the sinusoidal ac signal of 5 megahertzes by high-frequency oscillating circuits, isolate through T2, after T3 amplifies, be added on the former limit of isolating transformer B, be added on the alternating current bridge from the limit output signal of paying of B, the while sensor goes out oily signal and also is added on the alternating current bridge, their actings in conjunction produce detection signal and amplify through amplifying circuit, are added on the display circuit at last.
2, tester according to claim 1 is characterized in that a brachium pontis in the alternating current bridge circuit is adjustable condenser C and carries out in parallelly with capacitor C 0 and K switch series circuit, and C0 is taken as to appoint between 1.45PF～1.55PF and gets.
3, tester according to claim 1, the no-load voltage ratio that it is characterized in that isolating transformer B is 1:1.5.
4, tester according to claim 1 is characterized in that sensor is to constitute the bifilar helix formula by the copper sheet bar, is satisfied with also to form with it on the substrate disk plane formula sensor of one.
5, tester according to claim 1 is characterized in that in the amplifying circuit, is added with adjustable resistance on the emitter-base bandgap grading of T6, and value is 1K * 2.
6, tester according to claim 1 is characterized in that in the fan-shaped dial plate, and drawing has the temperature correction scale, and mark " red " and " green " two lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89203606 CN2067832U (en) | 1989-04-01 | 1989-04-01 | Quality measurer for frying oil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89203606 CN2067832U (en) | 1989-04-01 | 1989-04-01 | Quality measurer for frying oil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2067832U true CN2067832U (en) | 1990-12-19 |
Family
ID=4861126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89203606 Withdrawn CN2067832U (en) | 1989-04-01 | 1989-04-01 | Quality measurer for frying oil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2067832U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852783A (en) * | 2010-05-21 | 2010-10-06 | 重庆市计量质量检测研究院 | Method for detecting hogwash oil by combination of headspace solid-phase microextraction and gas chromatography mass spectrometry |
| CN102507379A (en) * | 2011-11-16 | 2012-06-20 | 张峰 | Detection method for checking whether edible oil contains illegal cooking oil |
| CN102519953A (en) * | 2011-12-09 | 2012-06-27 | 黄耀江 | Method for rapidly identifying inferior edible oil |
-
1989
- 1989-04-01 CN CN 89203606 patent/CN2067832U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852783A (en) * | 2010-05-21 | 2010-10-06 | 重庆市计量质量检测研究院 | Method for detecting hogwash oil by combination of headspace solid-phase microextraction and gas chromatography mass spectrometry |
| CN102507379A (en) * | 2011-11-16 | 2012-06-20 | 张峰 | Detection method for checking whether edible oil contains illegal cooking oil |
| CN102519953A (en) * | 2011-12-09 | 2012-06-27 | 黄耀江 | Method for rapidly identifying inferior edible oil |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |