DE102010013238A1 - Device for measuring thickness of fat layers and soot layers of withdrawal system of e.g. deep-fat fryer, has thin rigid film whose section is mounted on measuring probe, placed on measuring layer and covered over measuring head - Google Patents

Abstract

The device has a measuring probe (1) operated by a magnetic or an eddy current method, where measuring head (7) of the probe is moved against spring force (5) in a probe housing (3) and arranged on a measuring layer. A section (10) of a thin rigid film is mounted on the probe, placed on the measuring layer and covered over the measuring head. The section of the thin rigid film is made of thermoplastic plastic that is selected from group of polypropylene, polyethylene, polyethylene terephthalate, polyamides and un plasticized PVC and detachably on the measuring head by an adhesive layer.

Description

TECHNICAL AREA

The invention relates to a device for measuring the thickness of fat layers, soot layers and mixed layers of these components on metal surfaces.

Such layers or deposits occur in exhaust systems of fryers and chimney flues, with increasing layer thickness increases the risk of fire. Experience has shown that deposits of a layer thickness above about 1.5 mm must be removed, otherwise there is a risk of fire.

STATE OF THE ART

So far, the layer thickness of such combustible layers is determined by means of a comb-like hand-held device, which is scraper-like scratched out through the layer and should allow the reading of the layer thickness of appropriately calibrated comb teeth. However, this method leads to inaccurate results and depends on the manual skill of the operator. In particular, this method is not feasible for hardened, crust-like deposits.

TASK

The invention has for its object to provide a device for measuring the thickness of fat layers, soot layers and these components mixed layers on metal surfaces, with which the layer thickness can be measured accurately, with little time and largely independent of the skill of the operator.

PRESENTATION OF THE INVENTION

This object is achieved according to claim 1 according to the invention by a device for measuring the thickness of fat layers, soot layers and these components mixed layers on metal surfaces by means of a magnetic or eddy current method measuring probe whose particular to be measured against the layer to be measured measuring head against spring force is slidably mounted in a probe housing, wherein on the probe a measuring head covering, over this area projecting and for abutment with the layer to be measured particular section of a thin rigid film od. Like. Solder is attached.

The device according to the invention allows a precise and rapid measurement of the layer thickness without scratching operations. The accuracy of the measuring process carried out with the device according to the invention can be increased even more if the layer thickness is measured at different measuring points and an average value is calculated. In this way, you can safely detect a threat of fire and make a timely cleaning of the trigger. By regular thickness measurements with the device according to the invention but also the necessary cleaning intervals can be determined more accurately than with the previous Abkratzmethode, whereby unnecessary cleaning costs can be avoided.

The film section used must be of sufficient surface area so that it is not pressed into the soft layer during the measurement process by the measuring head due to excessive surface pressure, which would falsify the measurement result. The thickness of the film section can be taken into account during the measuring process with a balance.

For the releasable attachment of the film section on the measuring head are in a further embodiment of the device according to the invention several options available. Thus, the film portion according to claim 2 on the measuring head can be releasably secured by an adhesive layer.

In a preferred embodiment of the device specified in claim 3, the film section is formed by the bottom wall of a cup-shaped cap, which is releasably secured by means of its peripheral wall in the friction fit on the probe housing.

However, the releasable attachment of the film section can also be carried out according to claim 4 by a mounted on the probe housing film holder having a receiving slot for releasably securing a peripheral region of the film section.

Instead of using a thin, rigid film, a thin glass plate or a thin rigid board may also be used. However, the film section according to claim 5 preferably consists of a thermoplastic selected from the group of polypropylene, polyethylene, polyethylene terephthalate, polyamides and plasticizer-free polyvinyl chloride.

The thickness of the film portion should be in accordance with claim 6 between about 0.075 and about 0.5 mm. For the inventive use film sections are well suited, which are cut from a biaxially stretched film, as specified in claim 7.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be explained in more detail with reference to three embodiments of the device schematically and magnified showing drawings. It shows:

1 in a longitudinal section of a first embodiment of a measuring probe with a releasably attached to the measuring head by means of an adhesive layer film section,

2 in a further longitudinal sectional view of a second embodiment of a measuring probe with a pushed onto the probe housing cup-shaped cap whose bottom wall forms the film section, and

3 in a side view of a third embodiment of a measuring probe attached thereto foil holder, to which a film portion is releasably attached.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the 1 illustrated measuring probe 1 of the first embodiment is via a supply cable 2 connected to the actual measuring unit, not shown. The measuring probe 1 has a closed probe housing 3 which is to be guided by hand during the measuring process. Inside the case 3 is one in two opposite housing slots 4 against the force of a spring 5 slidably guided board 6 , which is equipped with electronic components (not shown) of the measuring electronics.

On the board 6 is a measuring head 7 fixed in a housing opening 8th guided, from the probe housing 3 outwardly projecting and at its outer end with a plate 9 is firmly connected, on which a film section 10 by means of an adhesive layer 11 is releasably attached.

The thickness of the film should be chosen so that it does not bend during the measuring process, but rests flat on the layer to be measured of grease and / or soot. Instead of a foil section 10 Also, a thin glass plate or thin rigid cardboard section can be releasably attached to the plate 9 be glued on.

To explain the second embodiment will now be more 2 Referenced. The measuring probe shown there 1 corresponds to the in 1 shown measuring probe including their with the reference numbers 1 - 8th designated elements.

The film section to be placed on the layer to be measured in a planar manner is hereby penetrated by the bottom wall 12 a cup-shaped thermoformed foil cap 13 formed, which with its inner surface 14 the end face of the measuring head 7 is applied. The foil cap 13 is by means of its peripheral wall 15 in friction fit on the probe housing 3 releasably secured, but with axial displacements of the film body on the outer wall of the probe housing 3 possible are.

Also at the third in 3 illustrated embodiment, the probe corresponds 1 in their internal structure, the measuring probes of the two embodiments described above. On the outer peripheral surface of the probe housing 3 is a foil holder 16 attached, which can be attached for example by gluing. The foil holder 16 owns a measuring probe 1 enclosing mounting ring 17 and a laterally projecting mounting arm 18 in which there is a receiving slot 19 located.

The receiving slot 19 serves the releasable attachment of an edge region of the film section 10 , For this purpose, the attachment, as in 3 is shown by means of a transverse into the receiving slot 19 engaging clamping screw 20 respectively.

LIST OF REFERENCE NUMBERS

1

probe

2

power cable

3

probe housing

4

cabinet slots

5

feather

6

circuit board

7

probe

8th

housing opening

9

plate

10

film section

11

adhesive layer

12

bottom wall

13

foil cap

14

palm

15

peripheral

16

foil holder

17

fixing ring

18

Mounting Arm

19

receiving slot

20

clamping screw

Claims (7)

Device for measuring the thickness of layers of soot, layers of soot and layers mixed therewith on metal surfaces by means of a magnetic or eddy-current measuring probe ( 1 ), whose to plant to the layer to be measured certain measuring head ( 7 ) against spring force ( 5 ) in a probe housing ( 3 ) is displaceable, wherein at the measuring probe ( 1 ) a measuring head ( 7 ), over this area protruding and to the plant to the measured layer certain section ( 10 ) od a thin rigid film. The like. Is releasably secured. Apparatus according to claim 1, characterized in that the film section ( 10 ) on the measuring head ( 7 ) through an adhesive layer ( 11 ) is releasably attached. Apparatus according to claim 1, characterized in that the film section through the bottom wall ( 12 ) a cup-shaped foil cap ( 13 ) is formed, which by means of its peripheral wall ( 13 ) in friction fit on the probe housing ( 3 ) is releasably attached. Apparatus according to claim 1, characterized in that on the probe housing ( 3 ) a film holder ( 16 ) having a receiving slot ( 19 ) for the releasable attachment of an edge region of the film section ( 10 ) owns. Device according to one of claims 1 to 4, characterized in that the film section ( 10 ) consists of a thermoplastic material selected from the group consisting of polypropylene, polyethylene, polyethylene terephthalate, polyamides and plasticizer-free polyvinyl chloride. Device according to one of claims 1 to 5, characterized in that the thickness of the film section ( 10 ) is between about 0.075 and about 0.5 mm. Device according to claims 5 and 6, characterized in that the foil section ( 10 ) is cut from a biaxially stretched film.

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