JPS62108134A - Calibration signal generator for continuous gas analyzer - Google Patents

Abstract

PURPOSE:To eliminate maintenance personnel's burden on the calibration of an analyzer after the time for warming up the analyzer by comparing a difference between the value of a clock written into the previous memory and the value of the present clock with a preset value and calibrating the same. CONSTITUTION:A relational judgement part 8 writes the value of the clock 4 into the memory 6 at the intervals of the specified time t0 during the time when a power source is kept supplied to the gas analyzer. Said part compares whether the difference (TC-TO) between the value t0 written into the previous memory 6 and the present value TC of the clock 4 is larger than the preset value Tl or not. The judgement part outputs the 1st calibration signal after waiting for the lapse of the time for warming up the analyzer if said value is larger. On the other hand, the judgement part 8 does not emit the calibration signal when the (TC-TO) is longer than t0 but shorter than Tl. The relational judgement part 8 stores, for example, information on a service interruption into the memory 6 and stores the value TC of the present time as the value TO of the memory 6 to restore the initial state. The labor required for the maintenance personnel to throw a power source and to make calibration before and after the warming up time is thus made once and the burden of said personnel is decreased.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention is a continuous gas analyzer used for pollution prevention or industrial process control, and in particular, it is necessary to periodically calibrate the analyzer using a standard gas. The present invention relates to a device used to generate a calibration signal in a continuous gas analyzer.

Examples of such continuous gas analyzers include various non-dispersive infrared type analyzers, chemiluminescence (chemiluminescence) NOx meters, and magnetic type 02 meters.

(Prior Art) In these continuous gas analyzers, once the power is turned on, the gas to be measured cannot be measured unless the analyzer is warmed up and calibrated once.

(Problem to be solved by the invention) When turning on the power, the analyzer maintenance personnel turns on the power once and then
It was necessary to wait for warm-up time (approximately 1 to 3 hours) before performing calibration, which required two steps: turning on the fu source and calibrating.

Furthermore, when an analyzer is in operation for a long period of time, relatively short power outages ranging from 1 second or less to about 1 minute may occur, such as instantaneous power outages or short power outages due to unforeseen circumstances. In such cases, there may be no need to calibrate each time, and you may be able to start measuring immediately after the power is restored without needing any warm-up time, so it is recommended to always calibrate after the power is restored. There are times when there are problems.

The present invention eliminates the burden on maintenance personnel for calibration after the analyzer has warmed up when the continuous gas analyzer is powered on, and
The purpose of this invention is to realize a continuous gas analyzer that can be used even in cases where continuous measurement by the analyzer is not affected, such as in the case of instantaneous power outages.

(Means for Solving the Problems) The calibration signal generator of the present invention measures the time during which the power of the continuous gas analyzer is turned off, and when the power is turned on again, the power failure time exceeds a preset time TQ. In this case, calibration is performed once after waiting one analyzer warm-up time.

FIG. 1 shows a calibration signal generator according to the present invention.

, 4 is a clock backed up by battery 2, and 6 is a memory backed up by battery 2.

Reference numeral 8 denotes a comparison/judgment section, which writes the value of the clock 4 to the memory 6 at fixed time intervals (to) while the power is on to the continuous gas analyzer, and also writes the value of the clock 4 to the memory 6 and compares the value previously written to the memory 6 with the clock. The difference between the current value of 4 and the preset value (TQ
), and if it is, outputs a calibration signal after the analyzer warm-up time has elapsed.

(Example) FIG. 2 shows the minimum configuration of a continuous gas analyzer to which the present invention is applied. 11 is a continuous gas analyzer section.

Reference numeral 12 denotes a gas measuring section, which measures the concentration of the measurement gas sent through the gas switching section 14 and outputs the measurement results. Correct the zero point and span point of gas concentration calculation. Reference numeral 16 denotes a calibration signal generator, which has the configuration shown in FIG. 12 that the calibration gas is flowing.

IO is a display unit that displays power outage information.

The calibration signal generator 16 includes a clock 4 backed up by a battery 2, a memory 6 also backed up by the battery 2,
and a comparison/judgment section 8 that manages these operations and outputs a calibration signal. The comparison/judgment section 8 can be realized by, for example, a microcomputer.

Next, the operation of this embodiment will be explained with reference to FIG.

The comparison/judgment unit 8 reads the value Tc of the clock 2 at relatively short time intervals to (steps Sl, S2), and updates the stored value TO in the memory 6 with the read value.

At this time, before updating the value To in memory 6,
Read the value To (previously written value) contained in . If the current time is Tc, the difference between Tc and TO should be to when there was no power outage. In that case, the value Tc
is stored in the memory 6 as To (step S4→
When S9→S8→51)6 or Tc-To) is larger than to, the continuous gas analyzer including the comparison/judgment section 8 can be considered to have been powered off during that time.

In this way, when the power to the analyzer is turned off, the comparison/judgment section 8 can know the length of the power outage from (Tc-To) when the power is restored.

(A) Comparison/judgment unit 8 calculates that (T c −T o ) is to
The time TQ (TI2 value varies depending on the analyzer, but is usually 1
If the time is longer than the warm-up time Td, which is determined separately, a calibration signal is output, and one calibration is performed (steps 84 to S6). Power outage time T
o, the length of the power outage (Tc-To) is stored in the memory 6 (
After step S7), the current time Tc value is set to Tc in the memory 6.
The value is stored as o value (step S8), and the process returns to step S1.

(B) If (Tc To) is longer than to but shorter than TQ, the comparison/judgment section 8 does not output a calibration signal. The comparison/judgment unit 8 stores the power outage information in the memory 6 in step S4→
S9→S7), the current time Tc value is stored as the TQ value in the memory 6, step S8), and the process returns to step S1. The analyzer will begin continuous measurement after the power is restored. (Tc-To) is to
If it is slightly longer than that, no warm-up is necessary, and correct measurements can be taken immediately. Also, (Tc-To
) is close to TQ, the analyzer will make correct measurements after warming up.

Power outage information (T c - T o) in step S7, T
.

is stored in the power outage information area of the memory 6 retroactively for a certain period of time. When receiving a signal requesting output regarding power outage information from the outside, the comparison/judgment section 8 takes out these values from the memory 6 and outputs them to the display section 10. This makes it possible to obtain information regarding power outages in the stationary continuous analyzer, making it easier to understand the operating status of the analyzer.

Warm-up time T when (T e - T o ) is greater than or equal to TQ
By dividing d into several stages depending on the value of (Tc-To), even if calibration is to be performed, it is possible to complete the calibration in the minimum time and to start correct measurement.

In that case, for example, between steps S4 and 85 in FIG.
Steps SIO to S14 as shown in FIG. 4 are inserted. The warm-up time td is divided into three stages, tdo to tdp. tdo<td+ (td:p).

First, (Tc-To) is greater than or equal to TQ, but TQ.

If the value is less than 1, the analyzer is calibrated after waiting the warm-up time tdo (step S10→Sll→S5→S6).

If (Tc-To) is greater than or equal to Tflo and less than TQ+, wait for warm-up time td+ and calibrate the analyzer (step sio→S12→S13→S5→56) (Tc−
If T o ) is greater than or equal to TQ+, the analyzer is calibrated after a warm-up time td2 (step S1 o-+s 12
→S14→S5→S6).

The continuous gas analyzer shown in FIG. 2 has an automatic calibration function, so the gas switching section 14 is automatically switched in response to a calibration signal from the first calibration signal generator 16 to perform calibration. However, in the case of a continuous gas analyzer that does not have an automatic calibration function, a calibration signal from the calibration signal generator 16 may be used to notify maintenance personnel through the display unit 10 or other means that calibration is required. Just do it.

(Effects of the Invention) If the calibration signal generator of the present invention is applied to a continuous gas analyzer, maintenance personnel will only have to turn on the power and calibrate once before and after the warm-up time when starting up the continuous gas analyzer after it has stopped working. become. This reduction in labor is particularly effective when operating portable or portable analyzers that require calibration at relatively short intervals.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the present invention, FIG. 2 is a block diagram showing the minimum configuration of a continuous gas analyzer to which the present invention is applied,
FIGS. 3 and 4 are flowcharts showing the operation of the embodiment, respectively. 2... Battery, 4... Clock, 6... Memory, 8... Comparison/judgment section, 16... Calibration signal generator.

Claims (2)

[Claims] (1) A clock that is backed up by a battery, a memory that is backed up by a battery, and the value of the clock is written to the memory at regular intervals while the continuous gas analyzer is powered on, and the value of the clock is written to the memory from the previous time. A comparison judgment that compares whether the difference between the written value and the current value of the clock is larger than a preset value, and if it is larger, outputs a calibration signal after the analyzer warm-up time has elapsed. A calibration signal generator for a continuous gas analyzer, comprising: (2) When the difference between the value written in the memory last time and the current value of the clock is greater than the predetermined time, the comparison/judgment section also calculates the difference between the values and the current value of the clock using a battery. The calibration signal generation device for a continuous gas analyzer according to claim 1, wherein the calibration signal generation device for a continuous gas analyzer is stored in a backed-up memory for a certain period of time.