JPH055701A - Method for measuring life of lamp of ultra-violet absorption detector - Google Patents

Abstract

PURPOSE:To prevent an ultra-violet absorption detector from being used after the expiration of life of a lamp by judging whether reduction in sensitivity of the ultra-violet absorption detector which is a detector of a high-speed liquid chromatograph, etc., is actually caused by expiration of the life of the lamp or a failure of the detector itself to some extent and then by reporting a period when the lamp should be replaced. CONSTITUTION:A microcomputer 3 which performs signal processning by receiving an output of an ultra-violet absorption detector 2. a counter 31 which measures time for using a lamp, and a display portion 32 are provided. A constant-period timer is used for counting an analysis time as a counter 31 and a time for using the lamp is measured by starting counting when the lamp is turned on.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a lamp life of an ultraviolet absorption detector, and more particularly, it is possible to replace the lamp by measuring the lamp life of an ultraviolet absorption detector such as a high performance liquid chromatograph. The present invention relates to a method for measuring the lamp life of an ultraviolet absorption detector that can be performed.

[0002]

2. Description of the Related Art Conventionally, a lamp used in an ultraviolet absorption detector is replaced when the detection sensitivity of the lamp detector is lowered. As for the detection sensitivity of the ultraviolet absorption detector, the signal level was measured at two wavelengths, and the decrease in sensitivity was examined from the difference.

However, in such a method, the detection sensitivity of the ultraviolet absorption detector may be lowered due to the fact that the life of the lamp is actually exhausted and the detection sensitivity of the ultraviolet absorption detector is lowered. However, there is a drawback that it is difficult to determine whether it is decreasing. Also, it is difficult to determine when to replace the lamp,
There is also a drawback that the lamp life suddenly runs out and the ultraviolet absorption detector becomes unusable.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the drawbacks of the conventional example, and its problem is that the sensitivity of an ultraviolet absorption detector, which is a detector of a high performance liquid chromatograph, is lowered. However, it is possible to determine to some extent whether it is due to the life of the lamp or due to a failure of the detector itself, and informs when the lamp should be replaced, so that the UV absorption detector can be used depending on the life of the lamp. Another object of the present invention is to provide a method for measuring the lamp life of an ultraviolet absorption detector that avoids exhaustion.

[0005]

SUMMARY OF THE INVENTION The present invention provides a method for measuring the lamp life of an ultraviolet absorption detector, which measures the lamp usage time and a microcomputer which receives the output of the ultraviolet absorption detector and performs signal processing. Counter for
The above problem is solved by providing a display unit, using a fixed-cycle timer that counts analysis time as a counter, and starting counting when the lamp is turned on to measure the lamp usage time.

[0006]

The present invention operates as follows. That is, first
Set the lamp life of the UV absorption detector to the microcomputer. After that, the lamp usage time measurement counter is set to zero. When the lamp is on, the lamp usage time measurement counter is integrated. The next time the power is turned on or the lamp is turned on, when the usage time reaches 90% or more, the fact is displayed on the display unit. After that, add a control function so that you can check it for continuous use and confirmation of usage time. When the lamp whose life has expired is replaced, the above operation is repeated again.

[0007]

The present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory diagram of the configuration of an embodiment of the present invention.
1 is an analyzer comprising a high performance liquid chromatograph or the like, 2 is an ultraviolet absorption detector which is a detector of the analyzer 1, 3 is a micro computer which receives the output of the ultraviolet absorption detector 2 and performs signal processing, 31 Is a counter for measuring the lamp usage time, and 32 is a display unit. In addition, the counter 31
For this, a fixed period timer that counts the analysis time is usually used, and when the lamp is turned on, the counting is started to measure the lamp usage time.

On the other hand, FIG. 2 is a flow chart for explaining the operation of the embodiment of the present invention. The operation of the embodiment of the present invention will be described below with reference to FIGS. First, the lamp life is set in the microcomputer 3 so that the set time can be changed by changing the lamp characteristics of the ultraviolet absorption detector 2 (101 in FIG. 2). After that, the lamp usage time measuring counter 31 mounted on the microcomputer 3 is set to zero (102 in FIG. 2).

When the lamp is on, the lamp usage time measuring counter is integrated (103 in FIG. 2).
When the usage time reaches 90% or more when the power is turned on next time or when the lamp is turned on, the fact is displayed on the display unit 32 (104 in FIG. 2). After that, a control function is added for confirmation in case of continuous use or confirmation of use time (105 in FIG. 2).

When a lamp whose life has expired is replaced, the above operation (that is, the operation from 101 to 105 in FIG. 2) is repeated. The present invention is not limited to the above-mentioned embodiment, and various modifications can be made.

[0011]

According to the present invention described in detail above, there is an advantage that the replacement time of the lamp can be confirmed at a glance by measuring the usage time of the lamp. Also,
There is also an advantage that the lamp life can be confirmed by measuring the lamp life before the analyzer is shipped from the manufacturer. Further, by measuring the usage time of the lamp, there is an advantage that it can be determined whether or not the replacement of the lamp is due to a defective lamp.

Therefore, according to the present invention, it is determined whether the decrease in the sensitivity of the ultraviolet absorption detector, which is a detector such as a high performance liquid chromatograph, is actually caused by the lamp life or the detector itself is broken. (EN) A lamp life measuring method for an ultraviolet absorption detector is realized, which makes it possible to discriminate to some extent, and also informs when the lamp should be replaced, and prevents the ultraviolet absorption detector from becoming unusable due to the lamp life.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the embodiment of the present invention.

[Explanation of symbols]

 1 Analyzer 2 Ultraviolet absorption detector 3 Microcomputer 31 Counter 32 Display

Claims (1)

Claim: What is claimed is: 1. A method for measuring the lamp life of an ultraviolet absorption detector, which is a detector for a high-performance liquid chromatograph or the like, which receives a signal from the ultraviolet absorption detector to perform signal processing. -, A counter for measuring the lamp usage time, and a display unit, and using a fixed-cycle timer for counting analysis time as the counter,
A method for measuring the lamp life of an ultraviolet absorption detector, which starts counting when the lamp is turned on and measures the lamp usage time.