Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1991-05-31
1993-08-24
Raevis, Robert
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
G01P 2102
Patent
active
052378519
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a device for the analog actuation of a digital setting operation, specifically the setting and/or calibration of transducers equipped with microprocessors, with a setting shaft extending through the outside wall of a housing in the interior of which the electrical/electronic components of the transducer are contained, and with at least one electrical circuitry element arranged on the printed circuit board.
Such setting operations are necessary specifically for transducers serving to determine physical and/or chemical values of a process, to convert these to an electrical signal and transfer them to an evaluation unit or an information processing center. For instance, such transducers are used to determine the pressure, to fill level, temperature, moisture, amount of flowing bulk or of a liquid, the ion equilibrium state (Redox potential) or similar physical and/or chemical variables that occur during a process. For that purpose, the transducers are connected with a line through which the electrical signals are transmitted to the evaluation unit or to the information processing center, and through which also the electrical energy necessary for the functioning of the transducer is transmitted from the evaluation unit or the information processing center to the transducer.
The monitoring of complex process operations very often makes it necessary to arrange also the evaluation unit in the immediate vicinity of the process whose physical and/or chemical values are to be monitored. This has the disadvantage that the electronic component of the transducer and also the evaluation unit, mostly arranged outside the wall surrounding the medium being measured, are exposed to explosive or aggressive or other atmospheres which have an effect on their operability.
Therefore, it is necessary that both the electronic part of the transducer and the evaluation unit are surrounded by a wall providing a partition as against the explosive or aggressive atmosphere.
On the other hand it is necessary to adjust the transducers at the site of usage to the measuring range corresponding to the conditions of use and to calibrate them, i.e., to adjust the zero point according to the test normals. The setting devices needed for that purpose are contained in the electronic part of the transducer. Heretofore this was an analog operation characterized mostly by the adjustment of spindle type or variable resistors. The introduction of modern microelectronics in the electronic circuits of the transducers associated with the use of microprocessors allows the digital adjustment and calibration, for instance by changing the counting pulses.
The presently customary electronic communication between transducer and evaluation unit also makes it possible to perform the setting and calibration of the transducer from the evaluation unit. To that end, naturally, the devices required for that purpose are accommodated in the evaluation unit.
Previously known from the German patent document 27 58 856 is a transducer, specifically for direct-measuring operational analysis instruments with an actuator device serving the calibration, within a housing where the housing wall consists of nonmagnetic material where a permanent magnet is connected with the actuator device and features an outer permanent magnet fashioned as an outer entrainment magnet, which permanent magnet can be set on the housing wall, where a rotation of the entrainment system causes the entrainment of the inner magnet and, thus, the actuation of an analog actuator device, without any bore extending through the nonmagnetic housing wall.
The problem underlying the invention is to propose a device for the analog actuation of a digital setting operation, specifically the setting of transducers equipped with microprocessors, where the actuation of the setting operation may be performed from outside through a simple rotary movement of a setting means extending through the wall that separates the electrical/electronic setting components from the explosive or aggressive atmosp
REFERENCES:
patent: 1658055 (1928-02-01), Lillyquist
patent: 4408896 (1983-10-01), Ikegami
patent: 4920784 (1990-05-01), Gonsior
patent: 4947674 (1990-08-01), Strain et al.
patent: 5008843 (1991-04-01), Poelsler et al.
"Instrument Housing Type V", Operating Manual, Endress + Hauser, pp. 1-6, date unknown.
"Measuring and Control Instrument for pH and Redox potential", Endress + Hauser, pp. 1-4, date unknown.
Maier Winfried
Pfuendlin Elmar
Endress u. Hauser GmbH u. Co.
Raevis Robert
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