JPH09229845A - Automatic testing apparatus in thermostatic bath - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automate the characteristic test of measuring instruments and apparatuses for a flammable gas, which is performed by using a thermostatic bath. SOLUTION: A heater 1, a cooler 3, a humidifier 4, a thermometer 5 and a hygrometer 6 are provided in order to adjust the temperature and humidity environment inside a thermostatic bath 1 to a test condition, and a flammable- gas detector 10, an emergency evacuation device 11 and an emergency gas shutoff valve 9a which are attached to the thermostatic bath 1 are provided. Then, a signal from the flammable-gas detector 10 is received, and the emergency evacuation device 11 is driven. Thereby, when a flammable gas is leaked into the thermostatic bath 1, it is discharged frocibly to the outside of the bath, and the supply of the gas is cut off so as to eliminate a need that a person watches the thermostatic bath 1 during a test.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic test in a thermostatic chamber used for observing the characteristics of instruments and devices passing through a combustible gas under constant temperature and humidity environment, such as measurement accuracy and safety. Regarding the device.

[0002]

2. Description of the Related Art Changes in measuring instruments, devices, etc. (hereinafter referred to as "measurement object") through which flammable gas changes due to changes in characteristics such as measurement accuracy and safety when temperature and humidity environments change. A test device called a constant temperature bath is used for observing.

FIG. 3 shows the structure of a conventional test apparatus, 1 is a thermostat (closed vessel), 2 is a heater for raising the temperature in the thermostat 1, and an electric heater is usually used. ing. Reference numeral 3 denotes a cooler for lowering the temperature in the constant temperature bath 1, which is usually an electric cooler.
4 is a humidifier for adjusting the humidity in the constant temperature bath,
Usually, an electric steam generator is used. Reference numeral 5 is a thermometer for detecting and displaying the temperature in the constant temperature bath 1, and 6 is a hygrometer for detecting and displaying the humidity in the constant temperature bath 1. In the figure, 7 is a stirrer (automatic controller device).

When observing changes in the characteristics of the object to be measured using the thermostatic chamber 1 having the above-described structure, a combustible gas is used to measure the object to be measured 8.
A pipe 9 for communicating with the above is provided, and this is put into the constant temperature bath 1. Then, while watching the thermometer 5 and the hygrometer 6, the heater 2, the cooler 3, and the humidifier 4 are controlled manually or automatically to adjust the temperature and humidity environment in the constant temperature bath 1 to the test environment, and this state Then, the change in the characteristics of the DUT 8 is observed.

[0005]

However, in the conventional constant temperature bath 1, there is no means for detecting a leak of flammable gas into the bath and a means for avoiding a risk such as explosion if the flammable gas leaks into the bath. Therefore, there is a disadvantage that a person must be clinging at all times during the test.

[0006]

SUMMARY OF THE INVENTION In the present invention, when a change in the characteristics of an object to be measured is tested using a thermostat, if a flammable gas leaks in the thermostat, The feature is that it automatically detects and automatically discharges it out of the tank to avoid the risk of explosion, etc., and eliminates the inconvenience that a person must always cling to during the test. The structure is as follows.

[0007] 1. A heater, cooler, humidifier, thermometer, hygrometer for adjusting the temperature and humidity environment in the constant temperature chamber to the test conditions, and a flammable gas detector for detecting the flammable gas in the constant temperature chamber. , And an emergency exhaust device for forcibly exhausting the combustible gas leaked from the inside of the constant temperature bath, and a gas leak safety device for driving the emergency exhaust device in response to a signal from the combustible gas detector. Automatic test equipment in a thermostatic chamber.

2. The automatic test device in the constant temperature chamber according to the above 1, wherein a circuit for driving an alarm device for transmitting an alarm signal is added to a safety device when a signal from a combustible gas detector is received. .

3. When the signal from the flammable gas detector is received, the circuit for shutting off the emergency gas cutoff valve attached to the flammable gas supply pipe is added to the safety device when the emergency exhaust device is driven. Automatic test equipment in a constant temperature bath.

[0010]

The test example using the constant temperature bath having the above construction is the same as the conventional example. Should flammable gas leak into the tank during this test, the flammable gas detector detects it and outputs a signal to the safety device. When a signal is input from the combustible gas detector, the safety device immediately drives the emergency exhaust device to forcibly discharge the combustible gas in the tank to the outside of the tank. At the same time, an alarm device for transmitting an alarm signal is driven to, for example, sound a buzzer or light an alarm lamp. Or activate the buzzer and the alarm lamp at the same time. Alternatively, at the same time, the gas is stopped by driving the emergency gas cutoff valve attached to the flammable gas supply pipe.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described based on FIGS. 1 and 2. FIG. 1 is a partially cutaway perspective view showing the entire apparatus, and FIG. 2 is an explanatory view of the apparatus shown in FIG. 1. In FIGS. 1 and 2, reference numeral 1 is a thermostat (closed vessel), 2 is This is a heater for raising the temperature in the constant temperature bath 1, and an electric heater is usually used. 3
Is a cooler for lowering the temperature in the constant temperature bath 1, and an electric cooler is usually used. Reference numeral 4 denotes a humidifier for adjusting the humidity in the constant temperature bath 1, which is usually an electric steam generator.

Reference numeral 5 denotes a thermometer for detecting and displaying the temperature in the constant temperature bath 1, and outputting the temperature to the automatic control device 7. Reference numeral 6 denotes for detecting and displaying the humidity in the constant temperature bath 1. A hygrometer that outputs this humidity to the automatic control device 7, 7 is a stirrer (automatic control device), 8 is an object to be measured, 9 is a flammable gas supply pipe connected to the object to be measured 8, 9a
Is an emergency gas shutoff valve. In addition, this emergency gas shutoff valve 9
“A” may double as a test gas plug, or may be independently attached to the combustible gas supply pipe 9 as in the embodiment.

Reference numeral 10 is a combustible gas detector for detecting the concentration of combustible gas in the constant temperature chamber 1, 11 is an emergency exhaust device (fan), 12 is a safety device, and this safety device 12 is the constant temperature chamber 1. When the flammable gas leaks into the inside and is detected by the flammable gas detector 10 and sends a signal, the emergency exhaust device 11 is immediately driven to release the leaked flammable gas into the exhaust port 14.
At the same time as forcibly exhausting from the tank to the outside of the tank, an emergency gas shutoff valve 9a
Cut off. Reference numeral 13 denotes an alarm device, which outputs a gas leak signal to the buzzer or / and an alarm lamp side in conjunction with the driving of the emergency exhaust device 11 as described above. Reference numeral 15 is a door, 16 is an observation window, and 17 is an operation panel.

[0014]

As described above, the present invention is provided with the safety device for immediately discharging the combustible gas to the outside of the tank in the constant temperature tank and at the same time cutting off the gas supply. This eliminates the inconvenience that a person must always cling to a constant temperature bath during a test other than observation. Therefore, it is possible to automate the characteristic test of the instruments and devices through the combustible gas using the constant temperature bath.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire constant temperature test apparatus according to the present invention.

FIG. 2 is an explanatory view showing an entire constant temperature test apparatus according to the present invention.

FIG. 3 is an explanatory view of a conventional constant temperature test device.

[Explanation of symbols]

 1 constant temperature bath 2 heater 3 cooler 4 humidifier 5 thermometer 6 hygrometer 7 stirrer (automatic control device) 8 object to be measured 9 flammable gas supply pipe 9a emergency gas shutoff valve 10 flammable gas detector 11 emergency exhaust Device (fan) 12 Safety device 13 Alarm device 14 Exhaust port 15 Door 16 Observation window 17 Operation panel

Claims (3)

[Claims] 1. A heater, a cooler, a humidifier, a thermometer, a hygrometer for adjusting the temperature and humidity environment in the constant temperature chamber to a test condition, and for detecting a combustible gas in the constant temperature chamber. A combustible gas detector and an emergency exhaust device for forcibly exhausting the combustible gas leaked from the inside of the thermostatic chamber, and a gas for driving the emergency exhaust device in response to a signal from the combustible gas detector. Automatic test equipment in a thermostatic chamber equipped with a leak safety device. 2. The safety device according to claim 1, further comprising a circuit for driving an alarm device for transmitting an alarm signal when the emergency exhaust device is driven when a signal from the combustible gas detector is received. Automatic test equipment in a constant temperature bath. 3. A safety device is provided with a circuit for shutting off an emergency gas shutoff valve attached to a flammable gas supply pipe when the emergency exhaust device is driven when a signal from the flammable gas detector is received. An automatic test device in a thermostatic chamber according to claim 1.