EP1525467A1 - Measuring device comprising a grip element - Google Patents
Measuring device comprising a grip elementInfo
- Publication number
- EP1525467A1 EP1525467A1 EP03771057A EP03771057A EP1525467A1 EP 1525467 A1 EP1525467 A1 EP 1525467A1 EP 03771057 A EP03771057 A EP 03771057A EP 03771057 A EP03771057 A EP 03771057A EP 1525467 A1 EP1525467 A1 EP 1525467A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- base part
- measuring
- measuring device
- probe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000523 sample Substances 0.000 claims abstract description 76
- 239000003792 electrolyte Substances 0.000 claims abstract description 38
- 238000011156 evaluation Methods 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 238000007781 pre-processing Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 239000011521 glass Substances 0.000 description 23
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 15
- 238000005259 measurement Methods 0.000 description 13
- 239000007788 liquid Substances 0.000 description 10
- 239000005518 polymer electrolyte Substances 0.000 description 10
- 229920001971 elastomer Polymers 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 235000013372 meat Nutrition 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 239000000806 elastomer Substances 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007765 extrusion coating Methods 0.000 description 3
- 230000005669 field effect Effects 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000003670 easy-to-clean Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 210000001331 nose Anatomy 0.000 description 2
- 238000001139 pH measurement Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 235000013580 sausages Nutrition 0.000 description 2
- 238000003307 slaughter Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical class [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000005070 ripening Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/02—Food
- G01N33/12—Meat; Fish
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/283—Means for supporting or introducing electrochemical probes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/36—Glass electrodes
Definitions
- Measuring device with a handle
- the invention is applicable in the field of measurement technology, namely for the measurement of charge carrier concentrations and possibly temperatures in liquids or solids, in particular meat in the meat industry.
- the invention finds application in the measurement of a pH.
- the invention relates to a measuring device with a handle part, a pH measuring probe detachably rigidly connected to it, elongated along a first axis, with a first housing and with a reference electrode detachably rigidly connected to the handle part with a second housing, the first housing is filled with a first electrolyte and the second housing with a second electrolyte.
- the pH is the negative decimal logarithm of the H + ion concentration (proton concentration) in a liquid. This hydrogen ion concentration can be changed within wide limits by adding bases or acids to water. The measured value of the pH provides information about the strength of the acid or base.
- the pH value is recorded in the meat industry as a quality measure.
- the pH value is measured, for example, shortly before and some time after slaughter, and the quality of the meat and the possible area of application, e.g. B. sausage production or the like can be determined.
- the ripening process can also be monitored for dry sausages and ham, for example.
- the pH can also be measured potentiometrically.
- Various standard electrodes are known, the electrode voltage of which can be converted into a measured pH value in relation to a reference electrode under the influence of a measuring substance.
- a known electrode used in laboratory technology is, for example, the hydrogen electrode.
- the so-called glass electrode has largely proven itself due to its robustness.
- Such a glass electrode basically has a glass container, the glass outer wall of which is designed as a membrane and which contains a first electrolyte in its interior.
- this first electrolyte there is the so-called measuring or discharge electrode, the potential of which is measured in relation to a reference electrode.
- the reference electrode is embedded outside the glass container in a second electrolyte, which is connected to the glass membrane on the one hand and to the substance to be measured via a diaphragm on the other hand.
- the diaphragm must be selected so that on the one hand the measuring substance in this area can come into contact with the second electrolyte, and on the other hand that the second electrolyte does not completely escape through the diaphragm. If the second electrolyte is slightly liquid, care must be taken to ensure that it does not flow out through the diaphragm.
- the diaphragm can then be designed as a porous membrane. In the case of viscous or gel-like electrolytes, this problem is reduced and such electrodes can also be used in different measuring positions without the second electrolyte escaping.
- the diaphragm can then have larger openings or be designed as an opening.
- a measuring probe for measuring pH values which has a measuring electrode, a Reference electrode and a second electrolyte in the form of a gel.
- the second electrolyte is arranged in a container which has a diaphragm in the form of an opening at which the gel-shaped electrolyte can come into contact with a measuring substance on the outside.
- the measuring electrode is an ion-sensitive field effect transistor.
- the measuring probe can be used, for example, to measure the pH of rice grains in order to determine their age.
- a pH measuring probe is also known from German published patent application 19857953, in which the potential of the measuring electrode is processed by means of an ion-sensitive field effect transistor. There an electrolyte is connected to a measuring liquid by means of a diaphragm.
- a pH measuring device with a pistol grip for determining the quality of slaughter meat is known from the website, which has a penetration probe in the form of a pH measuring probe. This is mechanically protected by a tubular steel telescope.
- a pH meter for the meat industry is known with a pistol grip which carries a pH measuring probe and a reference electrode.
- the pH measuring probe is supported by a metal frame.
- a temperature measurement is also provided.
- the pH measuring probe and the reference electrode have different lengths, making it difficult to insert both into a body to be measured at the same time, especially if the body does not have a certain minimum thickness.
- the known pH measuring devices have in common that they on the one hand between different measurements, especially if they are used in the food industry, have to be laboriously cleaned and that some of them are mechanically unstable, which makes it difficult to use them as a penetration probe for solids.
- the object of the invention is to create a measuring device of the type mentioned at the outset which, with high measuring accuracy, offers a stable construction which also allows piercing into a specimen and ensures easy cleaning.
- the object is achieved according to the invention in that the pH measuring probe and the reference electrode are rigidly connected to one another by means of a base part which, together with the pH measuring probe and the reference electrode, can be detachably rigidly connected to the handle part as a fixed assembly.
- the construction according to the invention on the one hand rigidly connects the pH measuring probe and the reference electrode to the handle part by means of the base part, so that the measuring device can be gripped on the grip part and inserted into a piece of meat, for example, in the manner of a puncture probe, on the other hand the pH measuring probe and the reference electrode is easily detachable from the handle part and is easy to clean or replace.
- the common attachment to a base part also ensures a parallel alignment of the pH measuring probe and the reference electrode, which is important for use as a penetration probe.
- the pH measuring probe and the reference electrode can be cleaned and refurbished or replaced together with the base part as a wearing part.
- the pH measuring probe and the reference electrode, together with the base part form an assembly which is also referred to below as the measuring module.
- An advantageous embodiment of the invention provides that the base part forms the bottom of the second housing and seals it tightly.
- the base part can have a seal into which the second housing can be inserted with a tight seal, so that the second electrolyte, which can be liquid or gel-like, cannot escape.
- the base part can either be firmly connected to the second housing by means of an adhesive bond or a weld or by means of an elastomer seal. The latter possibility has the advantage that the second housing can be detached from the base part for cleaning or refilling purposes.
- a further advantageous embodiment of the invention provides that the base part carries the electrical connection of the reference electrode. If the base part tightly seals the second housing, the electrical connection of the reference electrode, which must be carried out from the inside of the second housing to the outside, can advantageously be carried out tightly through the base part.
- the second housing can be made of glass, for example, or can only be added after the reference electrode has been assembled with the base part. In both cases, it would be complex and expensive to carry out the connection through the wall of the second housing.
- the base part can, for example, also consist of a plastic, into which the passage of the electrical connection can be injected or cast. The connection of the reference electrode is then easily accessible on the outside of the base part.
- a further advantageous embodiment of the invention provides that the base part forms the bottom of the first housing and seals it tightly.
- the base part can also have an elastomer seal into which the first housing, alone or closed in addition to the second housing can be pressed in with a tight seal.
- the first housing which can be made of glass, for example, can also be glued or welded to the base part.
- a further advantageous embodiment of the invention provides that the base part carries the electrical connection of the pH measuring probe.
- the electrical connection of the pH measuring probe would be complex and expensive, the implementation of this connection in the region of the base part, if it consists of a plastic, for example, is simple and inexpensive. The electrical connection of the pH measuring probe is then easily accessible on the outside of the base part.
- the invention can also be advantageously configured in that the first housing is detachably rigidly detachably connected to the base part.
- the first housing which surrounds the pH measuring probe, is sealed off on its own and on the one hand can be rigidly connected to the base part for measuring operation, and on the other hand can also be detached from it without losing its tightness. This makes handling the pH measuring probe for cleaning or replacement particularly easy.
- the manufacture of the measuring probe can also be simplified in this way, in particular if the base part tightly seals the second housing as a base, so that during the manufacturing process the second housing is first completed by means of the base part, filled with the second electrolyte and sealed and then the first Housing with the pH probe can be added.
- a silver wire 7, which is gold-plated in a rear region 7 ', is provided.
- the gold-plated area 7 'of the silver wire 7 is angled.
- the partially gold-plated silver wire 7 is placed with the gold-plated side outwards in a tool (not shown) and extrusion-coated with a plastic material, so that the receiving device 23 is formed.
- the receiving device 23 is then inserted into a further tool for producing seals 41, 42, 43.
- the receiving device 23 has grooves 40 on its outer surface. An elastomer is injected into these grooves 40 to form sealing noses 41.
- the receiving device 23 also has a central recess 26 from which the silver wire 7 protrudes. In the area of the recess 26 and at the upper end of the recess 26, an elastomer is also injected to form a rubber buffer 42 and an inner seal 43.
- the receiving device 23 also has at its end opposite the recess 26 a groove 44 running on the outer surface of the receiving device 23.
- a continuous transverse bore 45 is also provided in this area of the receiving device 23.
- the area 7 ′′ of the silver wire 7 protruding from the recess 26 is chlorinated.
- a glass tube 8 is provided to form the first housing for the pH measuring probe 2.
- a first electrolyte 16 in the form of an electrolyte liquid is filled into the glass tube 8.
- the glass tube 8 and the receiving device 23 are fixed against one another via the inner seal 43 and the rubber buffer 42 and the entire arrangement is sealed off from the outside.
- the silver wire 7 is pushed into the inner chamber 16 of the glass tube 8 with the electrolyte liquid contained therein.
- the silver wire 15 of the second electrode 15 and a stainless steel tube 50 for the temperature probe 50a are placed in another tool and suitably extrusion-coated with a plastic.
- the base part 12 is formed. After the extrusion coating, the silver wire 15 and the stainless steel tube 50 protrude from the base part 12.
- the silver wire 15 is then chlorinated with its end 15 ′ protruding from the base part 12.
- the stainless steel tube 50 is additionally advantageously covered on its outer surface with a plastic 51.
- a common thermal paste is filled into a tip of the stainless steel tube 50 to form the temperature probe 50a.
- a two-core NTC wire 52 (negative temperature coefficient) is then inserted into the interior of the stainless steel tube 50.
- the two ends of the NTC wire 52 protrude from the tube 50 on the side of the base part 12.
- a contact plate 53 is produced by extrusion coating.
- the base part 12 advantageously has a recess 54 into which the contact plate 53 is firmly inserted or snapped into place.
- Contact plate 53 has two contact pins 55 passing through the contact plate 53, which are soldered in an area facing the stainless steel tube 50 to the NTC wire ends 52 protruding therefrom.
- the silver wire 15 of the second electrode 15 is at its end protruding from the base part 12 in a specially in the receiving device 56 provided for the base part 12, for example an eyelet.
- the silver wire 15 is thus firmly fixed there.
- the silver wire 15 forms a contact area 19 there.
- the protruding end of the silver wire 15 is cut off again.
- the second housing 3 of the measuring module 1 is produced in a suitably designed tool by extrusion coating.
- the base part 12 serving as the base of the second housing 3 is then pushed into the interior of the second housing 3 with the temperature probe 50a and the reference electrode 15.
- the outwardly open end of the second housing 3 is then welded to the corresponding areas of the base part 12, for example by means of ultrasound, and thus closed.
- here is a double one
- Welded seam 57, 58 is provided, which is intended to prevent later flow out of the second electrolyte 14 in the form of a polymer protyl liquid.
- a corresponding welding process for producing the two weld seams 57, 58 is illustrated using three steps.
- connection options such as a snap-in connection, a thread or the like - would of course also be conceivable, although ultrasonic welding paired with a double weld seam 57, 58 (see (8a) - (8c)) is a particularly preferred method.
- the base part 12 has an opening 17, through which the pH measuring probe 2 can be inserted and into which the receiving device 23 can be inserted in a form-fitting manner.
- the pH measuring probe 2 is pushed through this opening 17 until it protrudes from the opening 5 at the other end of the second housing 3.
- the rubber noses 41 arranged in the outer grooves 40 of the receiving device 23 ensure sealing and fi fix the pH measuring probe 2 or the receiving device 23 in the recess 17 of the base part 12 provided for this purpose.
- Receiving device 23 and the base part 12 formed groove 60.
- an O-ring 61 is first inserted for sealing.
- a fixing screw 62 is screwed into a thread provided in the base plate 12 or on the pick-up device 23.
- another locking means for example a locking means, instead of an adjusting screw 62.
- Figure 2 filled the polymer protolyte solution, for example in the form of a gel in the outer chamber 14.
- FIG. 3 shows a second example of a measuring module 1.
- the measuring module 1 in FIG. 3 is characterized by a simpler, more compact design.
- the sealing device is designed to be less complex. Only a snap-in device is provided here.
- the housing 3 according to FIG. 3 also has no protective webs 20 for protecting the measuring tip 4.
- the measuring tip 4 is tapered towards the front end 6 and is therefore suitable for piercing into a solid material to be measured, for example meat.
- the measuring module 1 is advantageously composed of stability,
- FIG. 4 shows, using partial images (1) - (4), a second method for producing a measuring module 1 corresponding to FIG. 3.
- the method for producing the measuring module 1 essentially corresponds to the method described using FIG. 2. For this reason, only a few process steps were selected as examples in FIG. 4:
- the method steps (1) - (4) according to FIG. 4 differ from steps (1) - (5) according to FIG. 2 essentially in that the receiving device 23 in FIG. 4 is designed to be much simpler. In particular, the sealing lugs 41, the rubber buffer 42 and the inner seal 43 are missing here. Only a simple O-ring 46 is provided in the groove 40 here. For this, the Au device 23 is designed to be elastic. When the glass tube 8 is inserted into the recess 26, there are therefore frictional forces by means of which the glass tube 8 and the recess 26 are fixed against one another. Alternatively, the glass tube 8 and the receiving device 8 can be glued together.
- step (6) and (7) the production of the temperature probe 50a (steps (6) and (7)) is dispensed with here.
- the method makes it possible to produce a measuring module 1 in a much simpler manner, in which, despite further automation of the manufacturing process, the previous problem of the risk of breakage of the first housing 8 could be minimized during manufacture.
- FIG. 5 shows a measuring module 1 a, which has an internal pH measuring probe 2 a and a reference electrode 15 a lying outside the pH measuring probe 2 a.
- the reference electrode 15a is embedded in a second electrolyte 14a in the form of a polymer electrolyte, which is in the form of a gel.
- the pH measuring probe 2a has a diaphragm which is formed on the glass wall of the first housing 8a in the form of a glass tube.
- a first electrolyte 6a is arranged in the glass tube, for example in the form of a liquid.
- the measuring electrode 7a is arranged in this first electrolyte and serves to derive the measured value in the form of a voltage at its base-side end 18a.
- Such measuring probes are already commercially available and are used with a gel-like polymer electrolyte as the second electrolyte 14a, in particular in food technology for pH measurement in the case of solids, since on the one hand they are robust and on the other hand they can be used in a variety of ways without affecting the location of the probe must be observed during the measurement, since there is no risk of the polymer electrolyte present as a gel escaping.
- the polymer electrolyte can come into contact with a measuring substance outside the measuring probe through a diaphragm opening 5a, which is formed between the glass tube 8a and the wall of the second housing 3a. Such a contact changes the potentiometric ratios when the measuring substance contains ions, so that the pH value of the measuring substance can be calculated or determined by means of reference values using a potentiometric voltage measured between the pH measuring probe 2a and the reference electrode 15a ,
- a gel-like second electrolyte has advantages on the one hand, since a relatively large diaphragm opening 5a can be used, which is hardly blocked by microscopic contamination, as is the case with fine-pored diaphragms can happen, especially if substances containing protein are measured. An outflow of the second electrolyte is not to be feared.
- impurities can still get into the gel-like polymer electrolyte through the diaphragm opening 5a, as can germs that can multiply there, and air pockets can also arise that can falsify subsequent measurements.
- the problem of cleaning is solved in that a pump device for the gel is provided, which is arranged on the base of the measuring module in the region of the base part 12a and which is shown in more detail in FIGS. 7 and 8.
- FIG. 7 shows a piston 70 which, as indicated by the arrow 71, moves upwards by means of a drive wedge 70a under the action of the cone 73 of a drive screw 72 Inside the second housing 3a is slidable. In the interior of the housing 3a, the piston 70 displaces some of the second electrolyte, so that a certain amount of the second electrolyte, which is present as a polymer electrolyte, is pushed out of the measuring module through the opening 5a of the diaphragm and can be removed there.
- the pump device described would in itself only permit a single movement of the piston 70, although it is conceivable that this thrust movement can be divided into several steps, with the piston 70 being moved a little further after each measurement in order to clean the measuring module.
- a filling channel 79 in the piston 70 which can serve to feed some of the second electrolyte, the polymer electrolyte, into the housing 3a from a container 77, which is only shown schematically in FIG. 8, through a feed channel 76 to refill.
- the filling channel 79 can also be provided in the area designated 78 between the piston 70 and the housing wall
- FIG. 9a shows a side view of the pH measuring device, which has a handle part 100 and an assembly 101, which is also referred to as a measuring module. Handle part 100 and assembly 101 are inserted into one another and fixed to one another by means of a cap 102.
- FIG. 9b shows a view from below, that is to say, seen from the measuring tip 103 to the underside of the handle part 100.
- FIG. 9c shows a side view of the handle part 100 and the assembly 101.
- FIG. 9d shows a view of the pH measuring device from the top of the handle part 100, a digital display 104 for the measured pH value and a measured temperature value as well as an on / off switch 105 and an operating switch 106 for menu control of the measuring device you can see.
- the switches and the display are connected to the evaluation electronics 130 provided in the handle part 100.
- the handle part 100 is shown partially open, so that in the area of the receptacle 128 a plug-in base 107 can be seen, which comes into engagement with a contact part 108 fastened to the assembly 101 in the form of a plug during assembly.
- the electrical contacts between the measuring probes and the evaluation electronics 130 of the handle part 100 are thus produced.
- the cap 102 is shown separately here.
- a temperature sensor is shown as the assembly 101 in the figure alone, while the variant with a pH measuring module is alternatively shown below.
- the grip part according to the invention can also optionally exclude the connection. lent to a temperature probe with a separate base part.
- Preprocessing electronics can be connected upstream of the contact part 108 on the base part 114, which preprocesses the measurement values from a temperature probe or also from pH measurement probes, in order then to be able to pass on measurement values to the evaluation electronics 130 of the handle part 100, which result from individual characteristics of the temperature or pH measuring probes are independent, i.e. temperature compensation or other measured value correction can take place in the preprocessing.
- FIG. 11 shows a pH measuring device with a temperature probe in the assembled state of the assembly and handle part, the illustration being partially open, so that the interaction of the plug base 107 and the contact part 108 can be seen.
- FIG. 12 shows a cross-sectional representation of a reference electrode 109, a pH measuring probe 110 and a temperature probe 111, the pH measuring probe 110 being surrounded by a first housing 112, while the reference electrode 109 together with the pH measuring probe and its first Housing 112 is surrounded by a second housing 113.
- the base part 114 closes the second housing 113 so tightly at its end that the second electrolyte 116 located therein cannot escape there.
- the first electrolyte 115 is tightly enclosed in the glass first housing 112 of the pH measuring probe 110.
- FIG. 13a again shows an overview of the pH measuring device, in which housing walls are partially omitted.
- FIG. 13b shows the detail denoted by x in FIG. 13a, namely an actuation button in the handle part 100, the actuation button consisting of an actuation pin 117 and a metal spring part 118, as well as a cover 119, which consists of an elastomer which is tightly fitted into the wall of the handle part 100.
- the actuating pin 117 can be pressed down over the cover until the metal spring part 118 is loaded via a pressure point and breaks under contact. If the pressure on the button is reduced, the metal spring part 118 relaxes and presses the actuating pin 117 again to the outside of the housing of the handle part 100.
- the construction shown ensures a good seal of the handle part 100, so that no contaminating liquids occur even during continuous measurement Evaluation electronics of the handle part 100 can reach.
- FIG. 13c shows a detail which is designated Y in FIG. 13a, namely a battery compartment of the handle part.
- the battery compartment 120 consists of a hollow cylindrical part 121, in which cylindrical batteries 122 are stored, and a flange part 122.
- the hollow cylindrical part 121 is inserted into an opening at one end of the handle part 100 and sealed by means of an elastomeric seal 123.
- a latch 124 is provided to hold the hollow cylindrical part 121 in the grip part.
- FIG. 13d detail a can be seen in a section a-a, which is indicated in FIG. 13a. It shows how the handle part is formed from two half-shells 125 and 126, which are tightly connected to one another by welding, in particular ultrasonic welding. For the purpose of ultrasonic welding, at least one half-shell 126 carries a cutting edge 127.
- the evaluation electronics 130 in the handle part 100 can have a measured value memory for temperature measured values, pH measured values and the date of the day as well as the serial number of the measurements.
- the described features form a pH meter that is robust, easy to clean in daily use and can be used in a variety of ways due to the simple interchangeability of the measuring module.
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Food Science & Technology (AREA)
- Immunology (AREA)
- Medicinal Chemistry (AREA)
- Molecular Biology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002133902 DE10233902B4 (en) | 2002-07-25 | 2002-07-25 | Measuring device with a handle part |
DE10233902 | 2002-07-25 | ||
PCT/EP2003/007884 WO2004011934A1 (en) | 2002-07-25 | 2003-07-18 | Measuring device comprising a grip element |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1525467A1 true EP1525467A1 (en) | 2005-04-27 |
Family
ID=30774935
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03771057A Withdrawn EP1525467A1 (en) | 2002-07-25 | 2003-07-18 | Measuring device comprising a grip element |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1525467A1 (en) |
DE (1) | DE10233902B4 (en) |
WO (1) | WO2004011934A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10358354B4 (en) * | 2003-12-12 | 2008-07-03 | Testo Ag | Method for producing a pH measuring probe and measuring probe for pH measurement |
DE102007008072A1 (en) * | 2007-02-15 | 2008-08-21 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Modular meter |
DE102007008074A1 (en) * | 2007-02-15 | 2008-08-21 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Modular measuring device and method for its production |
CN108567415B (en) * | 2018-07-04 | 2024-05-07 | 重庆金山医疗技术研究院有限公司 | PH electrode catheter |
DE102019116287A1 (en) * | 2019-06-14 | 2020-12-17 | Endress+Hauser Conducta Gmbh+Co. Kg | Potentiometric probe |
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Publication number | Priority date | Publication date | Assignee | Title |
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CH610665A5 (en) * | 1976-03-12 | 1979-04-30 | Hoffmann La Roche | |
US4218299A (en) * | 1979-07-06 | 1980-08-19 | Beckman Instruments, Inc. | Short path liquid junction structure for electrochemical electrodes |
DE3814634A1 (en) * | 1988-04-29 | 1989-11-09 | Rudolf Matthaeus | Device for measuring the pH value in the meat of slaughtered animals |
DE8906234U1 (en) * | 1989-05-20 | 1989-07-06 | Neukum Elektronik Gmbh, 7541 Straubenhardt, De | |
GB9110474D0 (en) * | 1991-05-15 | 1991-07-03 | Commission Meat & Livestock | Meat quality sensing apparatus |
GB9726348D0 (en) * | 1997-12-13 | 1998-02-11 | Eastman Kodak Co | Ion concentration and pH measurement |
DE19857053B4 (en) * | 1998-12-10 | 2008-08-21 | Anton Zahoransky Gmbh & Co. | Method and apparatus for making brushes |
-
2002
- 2002-07-25 DE DE2002133902 patent/DE10233902B4/en not_active Expired - Fee Related
-
2003
- 2003-07-18 WO PCT/EP2003/007884 patent/WO2004011934A1/en not_active Application Discontinuation
- 2003-07-18 EP EP03771057A patent/EP1525467A1/en not_active Withdrawn
Non-Patent Citations (1)
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See references of WO2004011934A1 * |
Also Published As
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DE10233902B4 (en) | 2007-06-14 |
DE10233902A1 (en) | 2004-05-13 |
WO2004011934A1 (en) | 2004-02-05 |
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