NL2016828B1 - Method for monitoring gas concentrations at a site - Google Patents

Method for monitoring gas concentrations at a site Download PDF

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Publication number
NL2016828B1
NL2016828B1 NL2016828A NL2016828A NL2016828B1 NL 2016828 B1 NL2016828 B1 NL 2016828B1 NL 2016828 A NL2016828 A NL 2016828A NL 2016828 A NL2016828 A NL 2016828A NL 2016828 B1 NL2016828 B1 NL 2016828B1
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Netherlands
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sensor device
site
gas
data
sensing device
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NL2016828A
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Dutch (nl)
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NL2016828A (en
Inventor
Rutger Oudmans Jules
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Ureason Int B V
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Priority to NL2016828A priority Critical patent/NL2016828B1/en
Priority to PCT/NL2017/050338 priority patent/WO2017204642A1/en
Publication of NL2016828A publication Critical patent/NL2016828A/en
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Publication of NL2016828B1 publication Critical patent/NL2016828B1/en

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
    • G08B21/14—Toxic gas alarms

Abstract

The invention relates to a method for monitoring gas (1) concentrations at a site (2), comprising the steps of: providing a sensing device (3) at a measurement position (4) at the site, the sensing device being part of a sniffer system (5) of one or more sensing devices, using a communication system (6) for communicating measurement data (7) between the sensing device and a base computer system (8), wherein the measurement data at least comprises the concentration of at least one gas at the measurement position, triggering an alarm when the gas concentration measured by the sensing device exceeds a predetermined threshold, characterized by continuously storing monitoring data of the sensing device, comprising at least the measurement data, in a storage system (9) and analysing the stored monitoring data in a data analytics step to detect patterns indicative of sensing device or site conditions.

Description

Title: Method for monitoring gas concentrations at a site FIELD OF THE INVENTION
The present invention relates to a method for monitoring gas concentrations at a site, comprising the steps of: providing a sensing device at a measurement position at the site, the sensing device being part of a sniffer system of one or more sensing devices, using a communication system for communicating measurement data between the sensing device and a base computer system, wherein the measurement data at least comprises the concentration of at least one gas at the measurement position, triggering an alarm when the gas concentration measured by the sensing device exceeds a predetermined threshold.
The present invention also concerns a monitoring system for monitoring gas concentrations at a site.
BACKGROUND OF THE INVENTION
Such methods are well-known in the art. US 2005/0035869 A1 for instance discloses a personal hydrogen sulphide gas alarm system for monitoring well-related conditions at a site. The alarm system triggers a fault monitoring system in response to detecting an abnormally high concentration of hydrogen sulphide to record a hydrogen sulphide fault and convey the respective information to a remote computer. US 6252510 B1 discloses a wireless monitoring system comprising one or more monitoring devices. Each of the monitoring devices can transmit data to and from an output centre or an alarm system. WO 2016/005805 A1 discloses a system for monitoring the safety of personnel on a work site, by providing the personnel with portable battery-powered safety monitors equipped with alarms and sensors to detect hazardous conditions. Each monitor is capable of serving as a node in a network of monitors to send information concerning detected alarms to other monitors in the network. A problem with the known methods is that such methods only provide relatively simple, local threshold violation alerts, i.e. if the respective sensing device detects a dangerous gas concentration, an alarm is triggered and action is taken, either by the person carrying the sensing device or by an emergency service alerted by the alarm.
In many cases, however, the alarm may be triggered too late, for instance if the person carrying the sensing device wears the sensing device at a wrong location on the person’s body, e.g. on the person’s helmet instead of the person’s chest. In such a case the person may have already inhaled dangerous amounts of gas without the sensing device being aware of this. Therefore, the person could die without an alarm ever being triggered.
In other situations the sensing device may function appropriately - triggering the alarm when the gas concentration exceeds the predetermined threshold. However, a further danger may lie in the cumulative exposure of the person to the gas. The known alarm and monitoring devices so not address such situations.
Also, in case of a gas leak being present at the site, it is preferred for a person rushing towards the gas leak (e.g. to investigate or repair the leak) to be aware of gas concentrations in the wider area around the leak. The known alarm and monitoring systems do not provide such information. Such information could be useful to the person for instance for establishing a safe route towards the leak.
Summarizing, the present monitoring systems do not allow for the wider safety situation of the individual sensing device and the site as a whole to be effectively studied, decreasing safety at the site.
An object of the invention is thus to provide a method for monitoring gas concentrations at a site, wherein the wider safety situation of the individual sensing device and the site as a whole are taken into account to improve site safety.
SUMMARY OF THE INVENTION
Hereto, the method according to the invention is characterized by continuously storing monitoring data of the sensing device, comprising at least the measurement data, in a storage system and analysing the stored monitoring data in a data analytics step to detect patterns indicative of sensing device conditions or site conditions.
By continuously storing monitoring data of the sensing device, such as sensing device location/movement, sensing device health, when an alarm is triggered, et cetera, and subsequently analysing the stored monitoring data in a data analytics step to detect patterns indicative of sensing device conditions or site conditions, the wider safety situation of the individual sensing device and the site as a whole can be studied and preventative measures can be taken if necessary. For instance, at a certain moment in time a person may be located at a certain location at the site and the sensing device registers a first concentration of a gas. At a later point in time, the person may again be located at the same location, wherein the sensing device registers a second gas concentration higher than the first gas concentration. This information can for example be used to predict the development of the gas concentration at the location at a later point in time (the increase in gas concentration possibly indicating a gas leak).
The continuous logging/storing of for instance sensing device accelerometer data can be used to see if the behaviour of the person wearing the sensing device is “normal” (drowsiness, unsteady gait - or worse - the person lying on the ground will show up as certain patterns in the respective dataset to be analysed). Such data can also be used to determine if the sensing device is worn in the correct way: the respective accelerometer data patterns associated with the device being attached to the person’s chest (correct) will differ from data patterns associated with the sensing device being attached to person’s head or helmet (incorrect).
Also, logging of movement patterns, for example obtained by recording position data associated with the device, can be used together with gas concentration measurements to map air quality at different locations at the site.
In the context of this patent application, the expression ‘site’ may relate to for instance chemical processing plants, animal fat and oil processing facilities, asphalt storage facilities, blast furnaces, breweries and fermentation process plants, silk processing plants, textile printing facilities, coal gasification plants, coke ovens, mines, fishing vessel holds, geothermal plants, waste processing facilities, paper production facilities, sewage treatment plants (or sewage systems), slaughterhouses, et cetera, et cetera. Furthermore, ‘hot spots’ concern locations where relatively high concentrations of gas are detected and ‘cold spots’ relate to locations where relatively low concentrations of gas are detected.
The ‘base computer system’ and the ‘storage system’ may broadly relate to a local system on the sensing device, but preferably relate to a centralized computer system operated independently of the sensing device, such as a cloud-based system as commonly found in today’s ‘Internet of Things’ (loT) era.
An embodiment relates to an aforementioned method, wherein the data analytics step comprises establishing a total exposure of the sensing device to the gas over time based on the continuously stored gas concentration at the measurement position. Determining the total exposure of a location (in case of a fixed sensing device) or a person (in case of a wearable/portable sensing device) is highly advantageous to predict health risks to personnel already at an early stage.
An embodiment relates to an aforementioned method, wherein the data analytics step comprises identifying hot and cold exposure spots at the site based on the measurement data of multiple sensing devices. The data of the multiple sensing devices can be advantageously used to chart the hot and cold spots at the site. Of course, a combination of measurement data from fixed as well as portable sensing devices can be used.
An embodiment relates to an aforementioned method, wherein the monitoring data comprises the time an alarm is triggered and the data analytics step comprises correlating alarms over time to identify problem areas at the site. In case of multiple alarms having been triggered within a short period of time, further inspection of the problem area could be warranted.
An embodiment relates to an aforementioned method, wherein the monitoring data comprises a health status of the sensing device. Such a health status may relate to battery status, sensor functioning, et cetera.
An embodiment relates to an aforementioned method, wherein the gas is H2S and/or CO and/or 02 and/or NOx, such as NO, N02 or N03. Especially H2S is a very dangerous gas, which can kill within seconds. With the relatively simple prior art systems, that trigger an alarm when a certain threshold is exceeded, the health of the person being exposed to the gas has often already been in extreme danger when the alarm actually goes off. The present invention provides a method of detecting whether gas levels, such as H2S levels, are about to get hazardous already at an early stage, allowing action to be taken before the situation really gets out of hand.
An embodiment relates to an aforementioned method, wherein the storage system is a cloud-based storage system or a server-based system, increasing storage reliability and flexibility.
An embodiment relates to an aforementioned method, wherein the communication system (preferably a wireless communication system communicating with an external server) is a LoRa-based or Sigfox-based communication system to allow for very long battery life of the sensing device and to provide for flexibility of placement/movement of the sensing device.
An embodiment relates to an aforementioned method, wherein the sensing device is a fixed sensing device installed at a fixed measurement position at the site. Having fixed sensing devices installed at the site allows for the position of the sensing device to be strategically determined beforehand. E.g. a higher density of fixed sensing devices could be installed near critical areas, whereas a lower density of sensing devices could be installed near less critical areas. The positioning of such fixed sensing devices could advantageously take into account the range/strength of the wireless signal.
An embodiment relates to an aforementioned method, wherein the sensing device is a personal sensing device worn on a body of a person located at the site. Such a configuration allows for a wider range of data analytics methods to be carried out, because the personal sensing device will usually not be at a fixed location at the site. Also, the personal sensing device will of course provide the best possibilities for monitoring the person’s health and the direct environment of the person.
An embodiment relates to an aforementioned method, wherein the personal sensing device comprises a gyroscope and an accelerometer to measure accelerations and directional vector on the person’s body, wherein the measured accelerations and directional vector are used to determine the position and orientation of the personal sensing device on the person’s body. As explained before, the sensing device accelerometer data can be used to see if the behaviour of the person wearing the sensing device is “normal” (drowsiness, unsteady gait - or worse - the person lying on the ground will show up as certain patterns in the respective dataset to be analysed). Such data can also be used to determine if the sensing device is worn in the correct way: the respective accelerometer data patterns associated with the device being attached to the person’s chest (correct) will differ from data patterns associated with the sensing device being attached to person’s head or helmet (incorrect).
An embodiment relates to an aforementioned method, wherein a wear alarm is triggered if the personal sensing device is wrongly positioned on the person’s body. The inventor has shown the insight that many fatalities occur due to the wearing of the sensing device in the wrong way. Triggering such an alarm long before the person has even entered an area with toxic gas levels has proven to be greatly beneficial with respect to the prevention of fatalities.
An embodiment relates to an aforementioned method, wherein the data analytics step comprises establishing a total exposure of the person based on the total exposure of the sensing device to the gas over time. The inventor has found that such a “personal dosimeter” has led to a further decrease in fatalities. Many fatalities occur due to the person being exposed to (a lower concentration of) a gas multiple times or during longer periods of time (i.e. a single exposure being lower than the predetermined threshold). This can be just as hazardous to the person’s health as a single occurrence of exceeding the threshold.
An embodiment relates to an aforementioned method, wherein the sensing device comprises a temperature sensor and a moisture sensor, wherein degradation of the gas sensor is based on temperature and/or moisture readings i.e. the conditions in which the sensing device is being used. The applicant has found that in case the sensing device is being used in e.g. dry areas, the sensors degrade faster (causing the sensing device to give wrong readings), therefore requiring relatively early calibration.
An embodiment relates to an aforementioned method, wherein an alarm is triggered when the person is about to enter a hotspot, to allow the person to avoid the hotspot.
Another aspect of the invention concerns a monitoring system for monitoring gas concentrations at a site, comprising: a sensing device arranged at a measurement position at the site, the sensing device being part of a sniffer system of one or more sensing devices, a communication system for communicating measurement data between the sensing device and a base computer system, wherein the measurement data at least comprises the concentration of at least one gas at the measurement position, an alarm, arranged for being triggered when the gas concentration measured by the sensing device exceeds a predetermined threshold, characterized by a storage system for continuously storing monitoring data, comprising at least the measurement data, and a data analytics system to analyse the stored monitoring data.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be explained hereafter with reference to an exemplary embodiment of a monitoring system and method according to the invention and with reference to the drawing. Therein:
The figure shows a schematic view of an embodiment of a monitoring system and method according to the invention.
DETAILED DESCRIPTION
The figure shows a monitoring system 15 for monitoring gas concentrations, for instance H2S, at a site 2. Apart from H2S, the gases 1 could for instance comprise CO, 02, NOx, et cetera.
As stated before, such a site 2 comprise for instance chemical processing plants, animal fat and oil processing facilities, asphalt storage facilities, blast furnaces, breweries and fermentation process plants, silk processing plants, textile printing facilities, coal gasification plants, coke ovens, mines, fishing vessel holds, geothermal plants, waste processing facilities, paper production facilities, sewage treatment plants (or sewage systems), slaughterhouses, et cetera, et cetera. Merely for illustrative purposes, the figure shows a road running through the site 2 and the upper left corner of the site 2 shows three cylindrical storage tanks, whereas the lower right corner shows a building. The figure shows a pair of sensing devices 3 arranged at two measurement positions 4 at the site 2, the sensing devices 3 being part of a sniffer system, schematically indicated by reference numeral 5. One of the devices is a fixed device 12 and the other device is worn by a person as a personal alarm device 13. A wireless communication system 6 is present for communicating measurement data 7 between the sensing device 3 and a base computer system 8. Although the communication system 6 is indicated by a WiFi symbol, it is not limited to communication merely via WiFi (i.e. the communication system 6 could also comprise other communication means). The presence of gases 1 is indicated by a number of clouds. The measurement data 7 at least comprises the concentration of at least one gas 1 at the measurement position 4. When the gas 1 level at any one of the sensing devices 3 reaches a predetermined threshold, an alarm is triggered -either by the sensing device 3 itself or indirectly via the base computer system 8 - or both. Preferably though, the alarm being triggered is not just limited to a local warning signal. A storage system 9, such as a cloud-based storage system (for instance Microsoft Azure®), is shown for continuously storing the vast amounts of measurement data conveyed by the sensing devices 3 to the base computer system 8. A continuous flow of measurement data 7 (or a “batch-wise” flow, i.e. a continuous flow interrupted at certain intervals) is stored in the storage system 9, along with associated data, such as time, sensing device location, composition of gases and other substances in the air (air quality), sensing device 3 health, et cetera. According to the invention, a data analytics system 14 is provided to analyse the stored monitoring data. Such data analytics system could for instance be arranged on an external server, or be comprised by an ‘app’ installed on a smartphone. Of course, the data analytics system 14, the storage system 9 and the base computer system 8 can be installed in a single physical apparatus (such as the sensing device 3 itself), or can be kept separate. Preferably though, the data analytics system 14, the base computer system 8 and the storage system 9 are kept separate to increase the operational reliability of the monitoring system 15. In an embodiment, the data is stored for 1,2 or more preferably even 3 years.
Preferably, the data analytics step comprises establishing a total exposure of the sensing device 3 to the gas 1 over time based on the continuously stored gas 1 concentration at the measurement position 4. The data analytics step can furthermore be used for identifying hot 10 and cold exposure spots 11 (i.e. high and low concentrations of a certain gas) at the site 2 based on the measurement data 7 of multiple sensing devices 3, 12, 13. Preferably, the monitoring data comprises the time an alarm is triggered and the data analytics step comprises correlating alarms over time to identify problem areas at the site, such as leaks.
Preferably, the communication system 6 comprises LoRa-based or Sigfox-based transmission systems to save energy and to be able to effectively operate in harsh environments. Other low battery power communication systems or other “loT” communication networks, however, are also conceivable. The transmission systems are to be installed in such way that factors like critical site areas, transmission range, required energy, et cetera, are taken into account.
As mentioned before, the sensing device 3 can be constituted by a personal sensing device 13 worn on a body of a person 16 located at the site 2. Preferably, the personal sensing device 3, 13 comprises a gyroscope to measure accelerations on the person’s 16 body, wherein the measured accelerations are used to determine the position of the personal sensing device on the person’s 16 body. A wear alarm is triggered if the personal sensing device 13 is wrongly positioned on the person’s 16 body. Therein, the data analytics step may also comprise establishing a total exposure of the person 16 based on the total exposure of the sensing device 13 to a gas 1 over time, such that the personal sensing device 13 acts as sort of “dosimeter”. Furthermore, the data analytics step can be used to establish further training requirements required by the specific person or, in general, by personnel visiting the site 2. The personal sensing device 13 is preferably resistant to shocks, waterproof (IP57 or IP67), ATEX compliant, lightweight (< 250 grams) and/or relatively small and preferably has clip for quick attachment and release.
The sensing device 3 (either fixed or wearable/portable) is preferably provided with functionality for setting a gas concentration (PPM) threshold for an alarm to be triggered. The alarm preferably is constituted by a sonic alarm ( > 90 dB), vibration, and/or a flashing (LED) light/panel. The PPM threshold may however be overruled by the base computer system 8. Preferably the sensing device’s 3 battery has a life of at least 10 hours. Charging is preferably to be provided by a Micro-USB adapter, or if possible, by solar panels arranged on the sensing device 3.
The data is preferably logged every 30 seconds. Gas concentrations are preferably logged every second. The same holds for position information, such as determined via GPS. Gyroscope information is logged preferably every second, such as angular velocities, minimum accelerations, maximum accelerations.
The sensing device 3 preferably is designed to operate within a temperature range of -40 - 60 °C.
It should be clear that the description above is intended to illustrate the operation of preferred embodiments of the invention, and not to reduce the scope of protection of the invention. Starting from the above description, many embodiments will be conceivable to the skilled person within the inventive concept and scope of protection of the present invention.
LIST OF REFERENCE NUMERALS 1. Gas 2. Site 3. Sensing device 4. Measurement position 5. Sniffer system 6. Communication system 7. Measurement data 8. Base computer system 9. Storage system 10. Hot exposure spot 11. Cold exposure spot 12. Fixed sensing device 13. Personal sensing device 14. Processing unit/data analytics unit 15. Monitoring system 16. Person

Claims (16)

1. Werkwijze voor het monitoren van gas (1) concentraties op een site (2), omvattend de stappen van: het verschaffen van een sensorinrichting (3) op een meetpositie (4) op de site, waarbij de sensorinrichting deel uitmaakt van een sniffersysteem (5) van een of meer sensorinrichtingen, het gebruiken van een communicatiesysteem (6) voor het communiceren van meetgegevens (7) tussen de sensorinrichting en een basiscomputersysteem (8), waarbij de meetgegevens ten minste de concentratie van ten minste een gas op de meetpositie omvatten, het activeren van een alarm wanneer de gasconcentratie gemeten door de sensorinrichting een vooraf bepaalde grens overschrijdt, gekenmerkt door het continue opslaan van monitoring gegevens van de sensorinrichting, omvattend ten minste de meetgegevens, in een opslagsysteem (9) en het analyseren van de opgeslagen monitoring gegevens in een data-analysestap om patronen te detecteren die indicatief zijn voor de toestand van de sensorinrichting of de site.A method for monitoring gas (1) concentrations on a site (2), comprising the steps of: providing a sensor device (3) at a measuring position (4) on the site, the sensor device forming part of a sniffing system (5) of one or more sensor devices, using a communication system (6) for communicating measurement data (7) between the sensor device and a basic computer system (8), the measurement data comprising at least the concentration of at least one gas at the measurement position include activating an alarm when the gas concentration measured by the sensor device exceeds a predetermined limit, characterized by continuously storing monitoring data from the sensor device, including at least the measurement data, in a storage system (9) and analyzing the stored monitoring data in a data analysis step to detect patterns indicative of the condition of the sensor device or site. 2. Werkwijze volgens conclusie 1, waarbij de data-analysestap het vaststellen van een totale blootstelling van de sensorinrichting aan het gas in de loop der tijd omvat, gebaseerd op de continue opgeslagen gasconcentraties op de meetpositie.The method of claim 1, wherein the data analysis step comprises determining a total exposure of the sensor device to the gas over time, based on the continuously stored gas concentrations at the measurement position. 3. Werkwijze volgens een van de voorgaande conclusies, waarbij de data-analysestap het identificeren van plaatsen met een hoge (10) en lage (11) blootstelling op de site omvat, gebaseerd op de meetgegevens van meerdere sensorinrichtingen.Method according to any of the preceding claims, wherein the data analysis step comprises identifying sites with a high (10) and low (11) exposure on the site based on the measurement data from a plurality of sensor devices. 4. Werkwijze volgens een van de voorgaande conclusies, waarbij de monitoring gegevens het tijdstip waarop een alarm is geactiveerd omvatten en de data-analysestap het aan elkaar relateren van alarmen in de loop der tijd omvat om probleemgebieden op de site te identificeren.A method according to any of the preceding claims, wherein the monitoring data comprises the time at which an alarm is triggered and the data analysis step comprises relating alarms to one another over time to identify problem areas on the site. 5. Werkwijze volgens een van de voorgaande conclusies, waarbij de monitoring gegevens een gezondheidstoestand van de sensorinrichting omvatten.Method according to one of the preceding claims, wherein the monitoring data comprises a health condition of the sensor device. 6. Werkwijze volgens een van de voorgaande conclusies, waarbij het gas H2S en/of CO en/of O2 en/of NOx is.The method according to any of the preceding claims, wherein the gas is H 2 S and / or CO and / or O 2 and / or NO x. 7. Werkwijze volgens een van de voorgaande conclusies, waarbij het opslagsysteem een cloud-gebaseerd opslagsysteem is of een server-gebaseerd systeem.The method of any one of the preceding claims, wherein the storage system is a cloud-based storage system or a server-based system. 8. Werkwijze volgens een van de voorgaande conclusies, waarbij het communicatiesysteem een LoRa-gebaseerd of Sigfox-gebaseerd communicatiesysteem is.The method according to any of the preceding claims, wherein the communication system is a LoRa-based or Sigfox-based communication system. 9. Werkwijze volgens een van de voorgaande conclusies, waarbij de sensorinrichting een vaste sensorinrichting (12) is, geïnstalleerd op een vaste meetpositie op de site.The method of any one of the preceding claims, wherein the sensor device is a fixed sensor device (12) installed at a fixed measurement position on the site. 10. Werkwijze volgens een van de conclusies 1-8, waarbij de sensorinrichting een persoonlijke sensorinrichting (13) is, gedragen op een lichaam van een op de site aanwezige persoon.The method of any one of claims 1-8, wherein the sensor device is a personal sensor device (13) carried on a body of a person present on the site. 11. Werkwijze volgens conclusie 10, waarbij de persoonlijke sensorinrichting een gyroscoop omvat en een accelerometer om versnellingen en richtingsvector op het lichaam van de persoon te meten, waarbij de gemeten versnellingen en richtingsvector worden gebruikt om de positie en oriëntatie van de persoonlijke sensorinrichting op het lichaam van de persoon te bepalen.The method of claim 10, wherein the personal sensor device comprises a gyroscope and an accelerometer to measure accelerations and directional vector on the body of the person, the measured accelerations and directional vector being used to measure the position and orientation of the personal sensor device on the body of the person. 12. Werkwijze volgens conclusie 11, waarbij een draagalarm wordt geactiveerd als de persoonlijke sensorinrichting foutief is gepositioneerd op het lichaam van de persoon.The method of claim 11, wherein a wear alarm is activated if the personal sensor device is incorrectly positioned on the body of the person. 13. Werkwijze volgens een van de conclusies 10-12, waarbij, wanneer afhankelijk van conclusie 2, de data-analysestap het vaststellen van een totale blootstelling van de persoon omvat, gebaseerd op de totale blootstelling van de sensorinrichting aan het gas in de loop der tijd.A method according to any of claims 10-12, wherein, when dependent on claim 2, the data analysis step comprises determining a total exposure of the person based on the total exposure of the sensor device to the gas over the course of the time. 14. Werkwijze volgens een van de voorgaande conclusies, waarbij de sensorinrichting een temperatuursensor en een vochtigheidssensor omvat, waarbij achteruitgang van de gassensor wordt gebaseerd op temperatuur- en/of vochtigheidsmetingen, i.e. de omstandigheden waarin de sensorinrichting wordt gebruikt.A method according to any one of the preceding claims, wherein the sensor device comprises a temperature sensor and a humidity sensor, wherein deterioration of the gas sensor is based on temperature and / or humidity measurements, i.e. the conditions in which the sensor device is used. 15. Werkwijze volgens een van de voorgaande conclusies, waarbij, wanneer afhankelijk van conclusies 3 en 10, een alarm wordt geactiveerd wanneer de persoon op het punt staat een plaats met een hoge blootstelling te betreden.A method according to any of the preceding claims, wherein, when dependent on claims 3 and 10, an alarm is triggered when the person is about to enter a high-exposure site. 16. Monitoring systeem voor het monitoren van gasconcentraties op een site, omvattend: een sensorinrichting aangebracht op een meetpositie op de site, waarbij de sensorinrichting deel uitmaakt van een sniffersysteem van een of meer sensorinrichtingen, een communicatiesysteem voor het communiceren van meetgegevens tussen de sensorinrichting en een basiscomputersysteem, waarbij de meetgegevens ten minste de concentratie van ten minste een gas op de meetpositie omvatten, een alarm, ingericht om geactiveerd te worden wanneer de gasconcentratie gemeten door de sensorinrichting een vooraf bepaalde grens overschrijdt, gekenmerkt door een opslagsysteem voor het continue opslaan van monitoring gegevens, omvattend ten minste de meetgegevens, en een data-analysesysteem om de opgeslagen monitoring gegevens te analyseren.16. Monitoring system for monitoring gas concentrations on a site, comprising: a sensor device mounted at a measuring position on the site, the sensor device forming part of a sniffing system of one or more sensor devices, a communication system for communicating measurement data between the sensor device and a basic computer system, wherein the measurement data comprise at least the concentration of at least one gas at the measurement position, an alarm arranged to be activated when the gas concentration measured by the sensor device exceeds a predetermined limit, characterized by a storage system for the continuous storage of monitoring data, comprising at least the measurement data, and a data analysis system to analyze the stored monitoring data.
NL2016828A 2016-05-25 2016-05-25 Method for monitoring gas concentrations at a site NL2016828B1 (en)

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