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Device for the determination of flow parameters for a fluid and method for operating such a device

A parameter and fluid technology, applied in measuring devices, measuring flow/mass flow, liquid/fluid solid measurement, etc., can solve the problems of high flow resistance and small airflow changes in long pipes, and achieve the goal of reducing measurement errors and optimizing airflow monitoring. Effect

Inactive Publication Date: 2005-10-26
WAGNER GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, long tubes have high flow resistance, so a tube break near the end of the tube causes only minor changes in airflow
It is impossible to detect such small airflow changes with devices and methods known from the prior art

Method used

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  • Device for the determination of flow parameters for a fluid and method for operating such a device
  • Device for the determination of flow parameters for a fluid and method for operating such a device
  • Device for the determination of flow parameters for a fluid and method for operating such a device

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Embodiment Construction

[0053] figure 1A schematic circuit diagram of a thermostatic anemometer according to the prior art is shown. The basic idea of ​​the thermostatic mode of operation is to reduce the influence of the thermal inertia of the heating wire probe 18 by keeping the sensitive element 18 at a constant temperature (resistance) and using the heating current required for this as an indicator of the flow rate. Scaling. A Wheatstone bridge is used for this, in which the resistance of the heating wire and thus the temperature of the heating wire is kept constant by means of feedback. In the balanced state, a defined voltage is present at the vertical diagonal C-D of the bridge, which is supplied by the servo amplifier 15 . If the convective cooling on the probe 18 changes, a small voltage is generated on the horizontal diagonal A-B, which is amplified several times and fed back to the vertical diagonal C-D of the bridge. Here the polarity of this feedback voltage is chosen such that the br...

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Abstract

The invention relates to a device for the determination of flow parameters of a fluid, in particular, the temperature and flow speed and changes therein, in a fluid flow for monitoring, a method for operating such a device, a determination method itself and a fire recognition or oxygen measuring device provided with such a device. The aim of the invention is the recognition of a slow or sudden blockage, crack or break in a pipe system (13) of an aspirative fire recognition device by means of a measurement technique, whereby an air flow sensor (1), operated with a constant excess temperature, is combined with a regulation algorithm, running in a microprocessor (4), for monitoring the fluid flow or the flow resistance in the pipe system (13). The required resistance of the air flow sensor (1) can thus be calculated according to an exact sensor calibration curve and a precise control loop (3) formed. The measured values recorded by the air flow sensor (1) are thus extremely reliable, such that changes in condition for the flow parameters provide information about the state of the pipe system (13) or the intake system.

Description

technical field [0001] The invention relates to a device for determining flow parameters, in particular temperature, flow velocity and their variations, in a fluid flow to be monitored, in particular in smoke and gas suction alarms, which has a thermoelectric device operating in thermostatic mode An airflow sensor under the airflow sensor, a thermoelectric temperature sensor and a regulating circuit for adjusting the overheating temperature ΔT on the airflow sensor, the invention also relates to a method of operating said device, a corresponding work using said device A method and a fire / fire (Brand) identification device or an oxygen measuring device equipped with said device. Background technique [0002] In particular, a device for determining a flow parameter of the type mentioned at the outset and a corresponding method for operating such a device are known from heated wire anemometers. Here a heated wire is placed in a flowing fluid and information on different flow p...

Claims

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Application Information

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IPC IPC(8): G01F1/696G01F1/698G08B29/04
CPCG01F1/698G08B29/043G01F1/696G08B17/113
Inventor L·布尔克哈尔特
Owner WAGNER GROUP
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