JPH06331512A - Method and equipment for setting calibration time of gas analyzer in flue - Google Patents

Abstract

PURPOSE:To provide a method and equipment for setting the calibration time of gas analyzer in flue in which a calibration time can be set highly accurately without requiring any manpower while allowing update of the calibration time or the determination of replacing time of calibration gas cylinder. CONSTITUTION:The calibration time setting equipment comprises means 1 for measuring the concentration of introduced calibration gas, means 2 for operating the settling time of measurement detected by the concentration measuring means 1, means 3 for storing the settling time thus operated, and means 5 for displaying the settling time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for setting a stable calibration time in a flue gas analyzer.

[0002]

2. Description of the Related Art In a flue gas analyzer, a calibration gas may have to be introduced from the vicinity of a sample probe for structural reasons, and depending on the system, the calibration gas may pass through a long tube wall. , It may not be possible to accurately grasp the time from the start of the supply of the calibration gas to the stabilization.

In such a case, the measured value of the calibration gas is recorded on the chart paper at the site, the time required for stabilization is visually judged, and the calibration time is manually set.

[0004]

However, as described above, when the setting of the calibration time is left to the judgment of a person, the calibration cost becomes high due to the high labor cost, and the reliability becomes high due to the variation of the judgment standard and the erroneous setting. In some cases, the high calibration time could not be set.

In order to obtain higher reliability, it is desirable that the calibration time be adjusted in a timely manner, and it is convenient if the replacement time of the calibration gas cylinder can be known in advance.

The present invention has been made in view of such circumstances.
Calibration time setting method for flue gas analyzer and its setting device that can set reliable calibration time without human intervention and can know the update time of calibration time and calibration gas cylinder replacement time Is intended to provide.

[0007]

According to the present invention, means for solving the above-mentioned problems are constructed as follows. That is, in the first aspect of the invention, the concentration of the introduced calibration gas is measured until it is sufficiently stabilized, the time required for the stabilization is calculated, and the stable time is stored in the storage means and displayed on the display means. It is characterized by doing.

In the second invention, the concentration measuring means for measuring the concentration of the introduced calibration gas, the calculating means for calculating the time required for the measured value detected by the concentration measuring means to stabilize, and the calculating means are used. The present invention is characterized in that a storage means for storing the calculated stable time and a display means for displaying the stable time are provided.

A third aspect of the present invention is characterized in that the arithmetic means of the second aspect is provided with an arithmetic start instruction means for transmitting an arithmetic start instruction of a stable time every predetermined period.

In the fourth invention, the cylinder replacement time calculation for calculating the calibration gas consumption required for one calibration from the stabilization time calculated by the calculation means in the third invention and calculating the replacement time of the calibration gas cylinder It is characterized by the provision of means.

[0011]

In the second aspect of the invention, the concentration of the calibration gas introduced into the flue gas analyzer is measured by the concentration measuring means until it becomes sufficiently stable, and the time required for the stabilization is calculated by the calculating means. The stable time is stored and set in the storage means, and the stable time is displayed on the display means.

According to the third aspect of the invention, the calculation means can calculate the stable time by the calculation start command sent from the calculation start command means at every predetermined period, and the update of the stable time can be set periodically.

In the fourth aspect of the invention, the cylinder replacement time calculation means calculates the consumption amount of the calibration gas required for one calibration from the stabilization time calculated by the calculation means, and the original calibration gas remaining amount is calculated for each calibration. The replacement time of the calibration gas cylinder can be calculated by subtracting the consumption amount of the calibration gas from the amount.

[0014]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a calibration time setting device in a flue gas analyzer according to the present invention. Reference numeral 1 indicates a sample gas introduced from a sample probe (not shown) or a portion in the vicinity of the sample probe. Concentration measuring means for measuring the concentration of the introduced calibration gas, 2 is the time required for the concentration of the calibration gas to stabilize based on the detection signal of the calibration gas sent from the concentration measuring means 1,
That is, it is a calculation means (CPU) for calculating the stabilization time T (see FIG. 2), and is provided in the control unit C surrounded by the alternate long and short dash line.

Regarding the above-mentioned stabilization time T, a detection signal sent from the concentration measuring means 1 is digitized every minute time (for example, 1 second) after the introduction of the calibration gas is started according to a preset program. The data is processed to obtain a point sufficiently stabilized to the extent that no change in the value is recognized, that is, a stable point A (at the concentration Y), and the time T up to that point is calculated as the stable time.

Then, the measurement time x obtained by adding a predetermined time thereafter becomes the time required for calibration, that is, the calibration time,
The stabilization time T and the calibration time x are displayed on the calibration time display means 5 and stored in the storage means (E ² PROM) 3. Therefore, it is possible to eliminate the conventional erroneous visual judgment of stabilization and the troublesomeness of human labor, and it is possible to achieve highly reliable setting of the stabilization time T at a low cost.

In this way, when the stabilization time T is obtained, the calibration time x is determined, and the consumption amount of the calibration gas required for one calibration can be grasped. Therefore, in this embodiment, a replacement time calculation means 2a for calculating the time to replace the calibration gas cylinder is provided in the calculation means 2, and the stable time T and the calibration time x calculated by the calculation means 2 are stored in the storage means 3. At the same time, the number of times of calibration is also stored and read out at any time, and the consumption of the calibration gas is sequentially subtracted from the initial calibration gas remaining amount set in the replacement time calculation means 2a, and when the replacement time is reached, the replacement time is displayed. The lamp of the means 6 is turned on to notify.

Since it is considered that the above-mentioned stabilization time T fluctuates with time due to changes in surrounding environmental conditions, etc., the calculation start command is given at an appropriate time in order to change the setting of the stabilization time T. A calculation start command is sent from the means 4 to the calculation means 2, and the calculation of the stable time T is newly started. Although illustration is omitted, it goes without saying that the calibration gas introduction system is activated based on the calculation start command to introduce the calibration gas from the calibration gas cylinder to the concentration measuring means 1.

[0019]

As described above, according to the present invention,
The time until the concentration of the calibration gas becomes sufficiently stable, that is, the stabilization time, is calculated and stored reliably and displayed according to a preset program without visual or manual operation. It is possible to eliminate erroneous settings, save labor costs, and perform highly reliable calibration.

Further, by calculating the stable time for each predetermined period, the setting of the stable time can be changed, and the calibration with higher reliability can be performed.

Then, the replacement time of the calibration gas cylinder can be calculated by subtracting the calibration gas required for each calibration from the original remaining amount of the calibration gas, and the maintenance management of the calibration gas cylinder becomes easy and reliable. .

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a calibration time setting device in a flue gas analyzer of the present invention.

FIG. 2 is a graph for explaining a calibration time setting method of the present invention.

[Explanation of symbols]

1 ... Concentration measuring means, 2 ... Calculation means, 2a ... Replacement time calculation means, 3 ... Storage means, 4 ... Calculation start command means, 5 ... Display means (calibration time display means).

Claims (4)

[Claims] 1. The measurement of the concentration of the introduced calibration gas until it is sufficiently stabilized, the time required for the stabilization to be calculated, the stable time being stored in the storage means, and being displayed on the display means. A method for setting a calibration time in a characteristic flue gas analyzer. 2. A concentration measuring means for measuring the concentration of the introduced calibration gas, a calculating means for calculating a time required for the measured value detected by the concentration measuring means to stabilize, and a stabilization time calculated by the calculating means. Storage means for storing
An apparatus for setting a calibration time in a gas analyzer for a flue, comprising a display means for displaying the stabilization time. 3. A calibration in a gas analyzer for a flue according to claim 2, further comprising calculation start command means for sending a calculation start command for a stable time to the calculation means every predetermined period. Time setting device. 4. A cylinder replacement time calculation means for calculating a calibration gas consumption amount required for one calibration from the stabilization time calculated by the calculation means, and calculating a calibration gas cylinder replacement time. Claim 2 or Claim 3
An apparatus for setting a calibration time in the flue gas analyzer described in.