CN211452545U - VOCs and fluoride sampler calibrating device - Google Patents

Abstract

The utility model discloses a VOCs and fluoride sampler calibration device, which comprises a roots flowmeter, a mass flowmeter, a laminar flowmeter, a buffer tank, a first gas sampling pump, a second gas sampling pump, and a first instrument The connection port, the second instrument connection port, the first gas solenoid valve, the second gas solenoid valve, the third gas solenoid valve, the fourth gas solenoid valve, the fifth gas solenoid valve and the sixth gas solenoid valve, which can realize the control of VOC Calibration of flow measurement performance and related parameters of fluoride and VOCs samplers The calibration of the flow measurement performance and related parameters of the fluoride sampler calibrator with power unit and the VOCs sampler calibrator, and its components are installed in a container with a universal wheel, so that it can be easily pushed into the testing site for testing related calibration operations.

Description

VOCs and Fluoride Sampler Calibration Device

technical field

The utility model relates to the field of gas sampler calibration and detection equipment, in particular to a VOCs and fluoride sampler calibration device.

Background technique

Fluoride samplers and VOCs samplers are commonly used for directional capture of pollutants in ambient air. The fluoride sampler uses the filter membrane adsorption method to directionally capture the gaseous fluoride in the ambient air and the particulate fluoride dissolved in the hydrochloric acid solution; the VOCs sampler uses a solid adsorbent to enrich the volatile organic compounds in the ambient air. Currently, in accordance with relevant metrology and industry regulations, such samplers require annual calibration to ensure reliable metrology performance.

In recent years, the Ministry of Environmental Protection has issued the standard HJ644-2013 "Determination of Volatile Organic Compounds in Ambient Air by Adsorption Tube Sampling - Thermal Desorption/Gas Chromatography Mass Spectrometry", which stipulates the relevant measurement performance of VOCs sampler: Sampling pump of VOCs sampler The adjustable flow range is (10-500) mL/min, the flow error is ±5%, and the flow rate can be accurately maintained under load conditions. The commonly used working flow points in the process of ambient air sampling and detection are 40mL/min, 100mL /min. In addition, a calibrator accuracy better than 2% is required for calibrating the VOCs sampler, and an electronic mass flow meter is recommended. The promulgated HJ955-2018 "Membrane Sampling for the Determination of Fluoride in Ambient Air-Fluoride Ion Selective Electrode Method" stipulates the relevant measurement performance of the fluoride sampler: the sampling flow range of the fluoride sampler is (10 ~ 60)L/ min, the flow error is ±2.5%, and the sampling pump is also required to overcome the pressure load of 20kPa, and the commonly used working flow points in the process of ambient air sampling and detection are 16.7L/min and 50L/min.

Since there is no national metrological verification regulation or calibration specification for VOCs and fluoride samplers in my country, there is no calibration device for such samplers. The existing calibration device that is close to the requirements is a calibration device used to detect the atmosphere and dust sampler. The calibration flow range of the device is 100mL/min~1000mL/min, 80L/min~120L/min, and the measurement of the calibration result is not Certainty: U _r =1.6%, k=2. It cannot meet the calibration requirements of the low flow section (10-100) mL/min of the VOCs sampler; and the relevant industry standards mention that it is recommended to use an electronic mass flowmeter for calibration, and the "portable gas, dust, and smoke sampler calibration device" The low flow section is an electronic soap film flowmeter; it cannot meet the calibration accuracy level requirements of the fluoride sampler for the sampling flow range (10-60) L/min and the flow error ±2.5%; in addition, the Some of the calibrators use the method of negative pressure calibration. At present, there is no power source for the "portable gas, dust, and fume sampler calibration device", so the negative pressure calibration cannot be realized; in addition, this type of sampler has been used indoors and outdoors for a long time. For the monitoring of ambient air, some sets are installed in a fixed position, which is not easy to disassemble. At this time, on-site calibration is required.

From the above analysis of the current situation, it can be seen that there is an urgent need for devices that can meet the above-mentioned calibration requirements for VOCs and fluoride samplers.

Utility model content

In view of this, the purpose of this utility model is to provide a VOCs and fluoride sampler calibration device to solve the problem of calibrating the flow measurement performance of ambient air samplers such as VOCs, fluoride, VOCs, etc.

The VOCs and fluoride sampler calibration device of the utility model comprises a roots flowmeter, a mass flowmeter, a laminar flow flowmeter, a buffer tank, a first gas sampling pump, a second gas sampling pump, a first instrument connection port, a second an instrument connection port, a first gas solenoid valve, a second gas solenoid valve, a third gas solenoid valve, a fourth gas solenoid valve, a fifth gas solenoid valve and a sixth gas solenoid valve;

The second instrument connection port is connected to the air inlets of the Roots flowmeter, the mass flowmeter and the laminar flow flowmeter respectively through a pipe, and the air outlet of the Roots flowmeter is connected to the air inlet of the fourth gas solenoid valve through a pipe. The air outlet of the flowmeter is connected with the air inlet of the fifth gas solenoid valve through a pipe, and the air outlet of the laminar flow flowmeter is connected with the air inlet of the sixth gas solenoid valve through a pipe;

The gas outlet of the fourth gas solenoid valve is respectively connected with the gas inlets of the first gas solenoid valve and the second gas solenoid valve through pipes;

The air outlet of the fifth gas solenoid valve is respectively connected with the air inlets of the first gas solenoid valve and the third gas solenoid valve through pipes;

The gas outlet of the sixth gas solenoid valve is also connected with the gas inlets of the first gas solenoid valve and the third gas solenoid valve respectively through pipes;

The air outlet of the first gas solenoid valve is connected to the first instrument connection port through a pipe;

The air outlet of the second gas solenoid valve is connected with the buffer tank through the pipe, and the buffer tank is connected with the air inlet of the first gas sampling pump through the pipe;

The gas outlet of the third gas solenoid valve is connected with the gas inlet of the second gas sampling pump through a pipe.

Further, the suction capacity of the first gas sampling pump is 5L/min˜100L/min, and the suction capacity of the second gas sampling pump is 5mL/min˜1500mL/min.

Further, the VOCs and fluoride sampler calibration device also includes a pressure generator for connecting to the instrument to be detected.

Further, the pressure range provided by the pressure generator is 100pa-7000pa.

Further, the VOCs and fluoride sampler calibration device further includes a container, the roots flowmeter, mass flowmeter, laminar flowmeter, buffer tank, first gas sampling pump, second gas sampling pump, first The gas solenoid valve, the second gas solenoid valve, the third gas solenoid valve, the fourth gas solenoid valve, the fifth gas solenoid valve, the sixth gas solenoid valve and the pressure generator are arranged in the container, and the first instrument connection port and The second instrument connection port is arranged outside the container, and the gas outlets of the first gas sampling pump and the second gas sampling pump are outside the container.

Further, the bottom of the container is provided with a universal wheel.

The beneficial effects of the present utility model:

1. The VOCs and fluoride sampler calibration device of the present invention can realize the calibration of the flow measurement performance and related parameters of the VOC, fluoride and VOCs samplers, and can realize the calibration of the fluoride sampler calibrator and The calibration of the flow measurement performance and related parameters of the VOCs sampler calibrator with a power unit can realize the flow measurement performance and related parameters of the fluoride sampler calibrator without a power unit and the VOCs sampler calibrator without a power unit. The calibration of parameters can also realize the calibration of the flow measurement performance and related parameters of other ambient air samplers (sampling flow ranges from 5mL/min to 1500mL/min and 5L/min to 100L/min).

2. The calibration device of the VOCs and fluoride sampler of the present utility model, the components of which are coupled as a whole and are installed in a container with a universal wheel, so that only one calibration person can easily push the calibration device into the testing site Carry out the relevant calibration operation.

Description of drawings

FIG. 1 is a schematic diagram of the structure and principle of the VOCs and fluoride sampler calibration device in the embodiment.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in the figure, the VOCs and fluoride sampler calibration device in this embodiment includes a roots flowmeter 3, a mass flowmeter 4, a laminar flowmeter 5, a buffer tank 6, a first gas sampling pump 7, and a second gas sampling Pump 8, first instrument connection port 10, second instrument connection port 11, first gas solenoid valve 12, second gas solenoid valve 13, third gas solenoid valve 14, fourth gas solenoid valve 15, fifth gas solenoid valve 16 and the sixth gas solenoid valve 17.

The second instrument connection port 11 is connected to the air inlets of the Roots flowmeter 3, the mass flowmeter 4 and the laminar flow flowmeter 5 respectively through pipes, and the air outlet of the Roots flowmeter is connected to the inlet of the fourth gas solenoid valve 15 through pipes. The gas port is connected, the gas outlet of the mass flowmeter is connected to the inlet of the fifth gas solenoid valve 16 through a pipe, and the gas outlet of the laminar flow flowmeter is connected to the inlet of the sixth gas solenoid valve 17 through a pipe.

The gas outlet of the fourth gas solenoid valve 15 is respectively connected with the gas inlets of the first gas solenoid valve 12 and the second gas solenoid valve 13 through pipes.

The gas outlet of the fifth gas solenoid valve 16 is respectively connected with the gas inlets of the first gas solenoid valve 12 and the third gas solenoid valve 14 through pipes.

The gas outlet of the sixth gas solenoid valve 17 is also connected to the gas inlets of the first gas solenoid valve 12 and the third gas solenoid valve 14 through pipes, respectively.

The gas outlet of the first gas solenoid valve 12 is connected to the first instrument connection port 10 through a pipe.

The gas outlet of the second gas solenoid valve 13 is connected to the buffer tank 6 through a pipe, and the buffer tank is connected to the air inlet of the first gas sampling pump 7 through a pipe.

The gas outlet of the third gas solenoid valve 14 is connected to the gas inlet of the second gas sampling pump 8 through a pipe.

The first gas solenoid valve 12 , the second gas solenoid valve 13 , the third gas solenoid valve 14 , the fourth gas solenoid valve 15 , the fifth gas solenoid valve 16 , and the sixth gas solenoid valve 17 are in a normally open state.

In this embodiment, the pumping capacity of the first gas sampling pump is 5L/min～100L/min, and the pumping capacity of the second gas sampling pump is 5mL/min～1500mL/min.

The specific workflow of the VOCs and fluoride sampler calibration device in this example is as follows:

1) When the instrument 1 to be tested is a fluoride sampler, a fluoride sampler calibrator with a power unit, and other ambient air samplers (the sampling flow range is 10L/min ~ 60L/min), the positive air intake is used. method for calibration. That is, the air inlet of the first instrument to be tested 1 is connected with the first instrument connection port 10 of the calibration device through a hose, and the second gas solenoid valve 13, the third gas solenoid valve 14, the fifth gas solenoid valve 16 and the sixth gas solenoid valve 13 are closed. The gas solenoid valve 17 is turned on, the instrument to be tested 1 and the Roots flowmeter 3 are turned on, and the calibration can be started. At this time, the gas flow direction is: ambient air → second instrument connection port 11 → Roots flowmeter 3 → fourth gas solenoid valve 15 → first gas solenoid valve 12 → first instrument connection port 10 → first instrument to be tested 1 .

2) When the instrument 1 to be tested is the high-flow part of the VOCs sampler, the high-flow part of the VOCs sampler calibrator with a power unit, and other ambient air samplers (the sampling flow range is 100mL/min ~ 1000mL/min), it is also used. The forward air intake method is used to calibrate the flow. That is, the air inlet of the first instrument to be tested 1 and the first instrument connection port 10 of the calibration device are connected by a hose, and the second gas solenoid valve 13, the third gas solenoid valve 14, the fourth gas solenoid valve 15 and the sixth gas solenoid valve 13 are closed. When the gas solenoid valve 17 is turned on, the first instrument to be tested 1 and the mass flow meter 4 are turned on to start the calibration. At this time, the gas flow direction is: ambient air→second instrument connection port 11→mass flow meter 4→fifth gas solenoid valve 16→first gas solenoid valve 12→first instrument connection port 10→first instrument to be tested 1 .

3) When the instrument 1 to be tested is the low-flow part of the VOCs sampler, the low-flow part of the VOCs sampler calibrator with a power unit, and other ambient air samplers (the sampling flow range is 10mL/min ~ 100mL/min), the same is true Use the forward air intake method to calibrate the flow. That is, the air inlet of the first instrument to be tested 1 is connected with the first instrument connection port 10 of the calibration device through a hose, and the second gas solenoid valve 13, the third gas solenoid valve 14, the fourth gas solenoid valve 15 and the fifth gas solenoid valve 15 are closed. Gas solenoid valve 16. The calibration can be started by turning on the first instrument to be tested 1 and the laminar flow meter 5 . At this time, the gas flow direction is: ambient air → second instrument connection port 11 → laminar flow meter 5 → sixth gas solenoid valve 17 → first gas solenoid valve 12 → first instrument connection port 10 → first instrument to be tested 1 .

4) When the second instrument to be tested 2 is a fluoride sampler calibrator without a power unit, the negative pressure air intake method is used to calibrate the flow rate. That is, the gas outlet of the second instrument to be tested 2 is connected with the second instrument connection port 11 of the calibration device through a hose, and the first gas solenoid valve 12, the third gas solenoid valve 14, the fifth gas solenoid valve 16 and the sixth gas solenoid valve 12 are closed. Solenoid valve 17. The calibration can be started by turning on the second instrument to be tested 2 , the Roots flowmeter 3 and the first gas sampling pump 7 . At this time, the gas flow direction is ambient air → the second instrument to be tested 2 → the second instrument connection port 11 → the Roots flowmeter 3 → the fourth gas solenoid valve 15 → the second gas solenoid valve 13 → the buffer tank 6 → the first gas Sampling Pump 7.

5) When the second instrument to be tested 2 is a high-flow part of the VOCs sampler calibrator without a power device, the negative pressure air intake method is used to calibrate the flow. That is, the gas outlet of the second instrument to be tested 2 is connected with the second instrument connection port 11 of the calibration device through a hose, and the first gas solenoid valve 12, the second gas solenoid valve 13, the fourth gas solenoid valve 15 and the sixth gas solenoid valve 12 are closed. Solenoid valve 17. The calibration can be started by turning on the second instrument to be tested 2 , the mass flow meter 4 , and the second gas sampling pump 8 . At this time, the gas flow direction is ambient air→second instrument to be tested 2→second instrument connection port 11→mass flow meter 4→fifth gas solenoid valve 16→third gas solenoid valve 14→second gas sampling pump 8.

6) When the second instrument to be tested 2 is the low flow part of the VOCs sampler calibrator without a power device, the negative pressure air intake method is used to calibrate the flow. That is, the gas outlet of the second instrument to be tested 2 is connected with the second instrument connection port 11 of the calibration device through a hose, and the first gas solenoid valve 12, the second gas solenoid valve 13, the fourth gas solenoid valve 15 and the fifth gas are closed. Solenoid valve 16. The calibration can be started by turning on the second instrument to be tested 2 , the laminar flow flowmeter 5 and the second gas sampling pump 8 . At this time, the gas flow direction is ambient air→second instrument to be tested 2→second instrument connection port 11→laminar flow meter 5→sixth gas solenoid valve 17→third gas solenoid valve 14→second gas sampling pump 8.

The VOCs and fluoride sampler calibration device in this embodiment can realize the calibration of the flow measurement performance and related parameters of the VOC, fluoride and VOCs sampler, and can realize the calibration of the fluoride sampler calibrator with power device and drive The flow measurement performance and related parameters of the VOCs sampler calibrator of the power device can be calibrated, and the flow measurement performance and related parameters of the fluoride sampler calibrator without a power device and the VOCs sampler calibrator without a power device can be realized. It can also calibrate the flow measurement performance and related parameters of other ambient air samplers (sampling flow ranges from 5mL/min to 1500mL/min and 5L/min to 100L/min).

As an improvement to the above-mentioned embodiment, the VOCs and fluoride sampler calibration device further includes a pressure generator 9 for connecting the instrument to be detected, and the pressure range provided by the pressure generator is 100pa-7000pa. The pressure generator can provide suitable air pressure for calibration of other metrological properties of the instrument under test as required.

As an improvement to the above embodiment, the VOCs and fluoride sampler calibration device further includes a container 18, the roots flowmeter, mass flowmeter, laminar flowmeter, buffer tank, first gas sampling pump, The second gas sampling pump, the first gas solenoid valve, the second gas solenoid valve, the third gas solenoid valve, the fourth gas solenoid valve, the fifth gas solenoid valve, the sixth gas solenoid valve and the pressure generator are arranged in the container, so The first instrument connection port and the second instrument connection port are arranged outside the container, and the gas outlets of the first gas sampling pump and the second gas sampling pump are outside the container. The components of the calibration device are coupled together and installed in the container, which is convenient for the transfer of the calibration device, and the bottom of the container is provided with a universal wheel 19, so that one person can easily push the calibration device into the testing site for relevant calibration operations. .

During the specific inspection process, a load device can be added between the air inlet of the first instrument to be inspected 1 and the first instrument connection port 10 of the calibration device as required to calibrate the load capacity of the first instrument to be inspected 1 . A load device can also be added between the air outlet of the second instrument to be tested 2 and the second instrument connection port 11 of the calibration device as required, so as to calibrate the load capacity of the second instrument to be tested 2 .

As an improvement to the above embodiment, the VOCs and fluoride sampler calibration device can also be provided with a temperature and humidity monitoring system, an atmospheric pressure monitoring system, a timing system, etc., so as to make its functions more complete.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should The technical solutions are modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and all of them should be included in the scope of the claims of the present invention.

Claims (6)

1. A VOCs and fluoride sampler calibration device is characterized in that: comprising roots flowmeter, mass flowmeter, laminar flowmeter, buffer tank, first gas sampling pump, second gas sampling pump, first instrument a connection port, a second instrument connection port, a first gas solenoid valve, a second gas solenoid valve, a third gas solenoid valve, a fourth gas solenoid valve, a fifth gas solenoid valve and a sixth gas solenoid valve; The second instrument connection port is connected to the air inlets of the Roots flowmeter, the mass flowmeter and the laminar flow flowmeter respectively through a pipe, and the air outlet of the Roots flowmeter is connected to the air inlet of the fourth gas solenoid valve through a pipe. The air outlet of the flowmeter is connected with the air inlet of the fifth gas solenoid valve through a pipe, and the air outlet of the laminar flow flowmeter is connected with the air inlet of the sixth gas solenoid valve through a pipe; The gas outlet of the fourth gas solenoid valve is respectively connected with the gas inlets of the first gas solenoid valve and the second gas solenoid valve through pipes; The air outlet of the fifth gas solenoid valve is respectively connected with the air inlets of the first gas solenoid valve and the third gas solenoid valve through pipes; The gas outlet of the sixth gas solenoid valve is also connected with the gas inlets of the first gas solenoid valve and the third gas solenoid valve respectively through pipes; The air outlet of the first gas solenoid valve is connected to the first instrument connection port through a pipe; The air outlet of the second gas solenoid valve is connected with the buffer tank through the pipe, and the buffer tank is connected with the air inlet of the first gas sampling pump through the pipe; The gas outlet of the third gas solenoid valve is connected with the gas inlet of the second gas sampling pump through a pipe. 2. The VOCs and fluoride sampler calibration device according to claim 1, wherein the pumping capacity of the first gas sampling pump is 5L/min～100L/min, and the second gas sampling pump The pumping capacity is 5mL/min～1500mL/min. 3. The VOCs and fluoride sampler calibration device according to claim 1 or 2, characterized in that it further comprises a pressure generator for connecting to the instrument to be detected. 4 . The VOCs and fluoride sampler calibration device according to claim 3 , wherein the pressure range provided by the pressure generator is 100pa～7000pa. 5 . 5. The VOCs and fluoride sampler calibration device according to claim 4, characterized in that: further comprising a container, the roots flowmeter, mass flowmeter, laminar flowmeter, buffer tank, first gas sampling pump , the second gas sampling pump, the first gas solenoid valve, the second gas solenoid valve, the third gas solenoid valve, the fourth gas solenoid valve, the fifth gas solenoid valve, the sixth gas solenoid valve and the pressure generator are arranged in the container , the first instrument connection port and the second instrument connection port are arranged outside the container, and the air outlets of the first gas sampling pump and the second gas sampling pump are outside the container. 6. The VOCs and fluoride sampler calibration device according to claim 5, wherein the bottom of the container is provided with a universal wheel.

Images