US 10,784,884 B2Granted

Field measuring device

AssigneeKROHNE Messtechnik GmbH

InventorsHelmut Brockhaus, Steffen Dymek, Manuel Fischnaller

Life of this patent

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Abstract

A field measuring device includes a sensor, a measuring transducer, and interface electronics. The interface electronics include a measuring and control device, and first and second terminals for connecting an external electrical device. A current controller and a current measuring device are connected in series in a terminal current path between the first and second terminals. The interface electronics has a voltage source that can be switched on in the terminal current path and disconnected from the terminal current path, so that the voltage source can drive a current in the terminal current path in the switched-on state and in the case of a connected external electrical device. The measuring and control device actuates and reads the current controller, the current measuring device, and the voltage source such that a current signal is output or input via the first and second terminals when an external device is connected.

Claims15

Dependent claims

A field measuring device, comprising:

a sensor;
a measuring transducer;
interface electronics having a measuring and control device and at least one first terminal and one second terminal for connecting an external electrical device,
a current controller and a current measuring device connected in series in a terminal current path between the first terminal and the second terminal in the interface electronics;
wherein the interface electronics has a voltage source that can be switched on in the terminal current path and disconnected from the terminal current path, so that the voltage source can drive a current in the terminal current path in a switched-on state in the terminal current path and in case of a connected external electrical device;
wherein the measuring and control device actuates and reads the current controller, the current measuring device and the voltage source in such a way that optionally an analog current signal or a binary current signal is output or input via the first terminal and the second terminal when an external device is connected.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/541,759Filed 15 Aug 2019
Priority: DE 10 2018 126 80826 Oct 2018
Published: US 2020/0136641 A130 Apr 2020
Granted: 22 Sep 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G01D 21/00
Measuring or testing not otherwise provided for
H03M 1/504
With intermediate conversion to time interval: using pulse width modulation
H03M 1/0612
Of deviations from the desired transfer characteristic: over the full range of the converter, e.g. for correcting differential non-linearity
H03M 1/406
Recirculation type: using current mode circuits, i.e. circuits in which the information is represented by current values rather than by voltage values