Article Calibration and Maintenance of Gas Detector

อุปกรณ์วัดแก๊ซรั่ว (Gas detector หรือ Gas leak detector)

แก๊ซและอากาศที่มีส่วนผสมเหมาะสม (Flammable mixture) เมี่ออุณภูมีสูงเกินจุดวาบไฟ (Flash point) ก็จะเกิดการลุกไหม้ (Ignite) หรือระเบิด (Explode)

อุปกรณ์วัดแก๊ซรั่ว (Gas detector) เป็นอุปกรณ์ทางด้านความปลอดภัยที่สำคัญอย่างมากในการรักษาความปลอดภัยจากการรั่วของแก๊ซไวไฟ แก๊ซพิษ ก๊าซเฉื่อย ซึ่งจะเกิดเพลิงไหม้ หรือระเบิด ก่อให้เกิดอันตรายต่อต่อทรัพย์สิน ธุรกิจ และบุคคล หรือเกิดอันตรายต่อระบบทางเดินหายใจ หรือการสัมผัสนานๆอาจจะเป็นอันตรายต่อการก่อเกิดโรคมะเร็ง

การวัดแก๊ซพิษ แก๊ซไวไฟ และปริมาณออกซิเจนในที่อับทึบ หรือบริเวณที่อากาศถ่ายเทไม่สดวก ก็เป็นเรื่องจำเป็นสำหรับความปลอดภัยในการทำงาน

ในกระบวนการผลิตมีจุดต่อ (Connection) ที่มีความเสี่ยง (Risk) ในการเกิดแก๊ซรั่วมากมาย เป็นร้อยเป็นพันจุด ความเสี่ยงที่จะเกิดแก๊ซรั่วย่อมมีมาก การใช้อุปกรณ์วัดแก๊ซรั่วเพื่อตรวจพบตั้งแต่รั่วน้อยๆ ปริมาณสะสมยังไม่มาก แล้วทำการแก้ไขแต่เนิ่นๆก็จะปลอดภัย หากปล่อยให้รั่วมาก สะสมมาก โอกาสเสี่ยงที่จะเกิดไฟไหม้ หรือระเบิดขึ้นได้ ความเสียหายที่เกิดขึ้นหรืออาจจะเป็นแค่เสียทรัพย์สินบางส่วน หรือใหญ่โตจนเกิดความหายนะทางธุรกิจใด้

แต่ความเสี่ยงจากแก๊ซรั่วยังคงมี เพราะอุปกรณ์วัดแก๊ซรั่วจะไม่สามารถติดตั้งได้ให้ครอบคลุมพื้นที่ทั้งหมดได้ และอุปกรณ์ที่ติดตั้งเมื่อใช้งานไปนานๆ ก็อาจจะมีการอ่านค่าผิดพลาดได้ ดังนั้นการตรวจสอบ ทบทวน การวัดค่า และการบำรุงรักษาจึงจำเป็นต้องทำตามระยะเวลา ตามวิธีการ ตามคำแนะนำของผู้ผลิต  

คำแนะนำของสมาคมควบคุมความปลอดภัย และตามข้อปฎิบัติที่ดีของอุตสาหกรรม (Industrial best practices)

อุปกรณ์วัดแก๊ซรั่วจะสูญเสียความสามารถในการตรวจจับ (Loose sensitivity) ตามอายุการใช้งาน (Aging) เนื่องจากการสัมผัสกับแก๊ซที่มีความเข้มข้นสูง (High concentrated hydrocarbon) ตัววัดสัมผัสกับสารทำลายความสามารถในการตรวจวัด (Sensor poisoning) เป็นต้น จึงจำเป็นต้องตรวจสอบความแม่นยำของอุปกรณ์การวัดเป็นระยะๆว่ายังทำงาน (Performance) ได้ถูกต้องหรือไม่ (Operating correctly)

เนื่องจากอุปกรณ์วัดแก๊ซรั่ว เป็นอุปกรณ์รักษาความปลอดภัยที่สำคัญมาก คุณภาพและความเชื่อได้ของอุปกรณ์ต้องมาจากผู้ผลิตชั้นดี มีชื่อเสียง การออกแบบระบบ เลือกใช้อุปกรณ์ การติดตั้ว การตรวจสอบ การทดสอบ การตรวจทานค่า (Calibration) และบำรุงรักษาต้องทำโดยบุคคลที่มีความรู้ มีทักษะ และมีประสบการณ์ ที่ใด้รับการอบรมจากโรงงานผู้ผลิตที่มีประกาศนียบัตรรับรอง เช่น ATEX, CE, NFPA, SIL,..เป็นต้น เท่านั้น มิฉนั้นการวัดสอบทวนอาจจะผิดพลาด เสี่ยงต่อการเกิดอุบัติภัยตามมา อาจจะได้ไม่คุ้มเสีย

Sensors ของ Gas detector มีความเสื่อมตามระยะเวลาการใช้งาน จึงจำเป็นต้องทำการตรวจทาน (Calibrate) ความถูกต้อง (Accuracy) ของการวัดอยู่อย่างสม่ำเสมอ เพื่อรับประกัน (Assurance) ว่าการวัดจะถูกต้อง

อุปกรณ์การวัดแก๊ซรั้วมี 2 แบบ คือ

1. แบบติดตั้งกับที่ (Fixed gas detector)

2. แบบพกพา (Portable gas detector)

เทคโนโลยี่ของอุปกรณ์วัดแก๊ซรั่ว (Gas detector technology)

มีหลายเทคโนโลยี่ที่นิยมใช้กัน ขึ้นกับชนิดของแก๊ซที่จะวัด และที่ติดตั้ง เพราะความสามารถในการวัดจะไม่เหมือนกัน เช่น

• Catalytic Bead
• Metal Oxide Semiconductor (also known as “solid state”)
• Point Infrared Short Path
• Open (Long Path) Infrared
• Photoacoustic Infrared
• Electrochemical for Toxic Gas Detection
• Electrochemical for Oxygen Detection
• Thermal Conductivity
• Photoionization
• NDIR
• Ultrasonic
• Laser

ทุกๆเทคโนโลยีต้องการสอบทานเป็นระยะๆ ระยะการตรวจทานของแต่ละเทคโนโลยีจะมีความถี่ไม่เท่ากัน

คำอธิบายคำที่ใช้ (Glossary) ที่ใช้ในการวัด

• Calibration is the first setting of sensor limits, which is performed during production and its output is a calibration protocol. Simply put, calibration determines signaling limits of the gas concentration at which the detector alarm is triggered.
• Recalibration is a re-comparison of measured values against a standard.
• Calibration gas intended for this is considered as a standard. It is usually a calibration gas with an issued certificate of concentration accuracy. Using the calibration gas, reference value of the gas concentration is stored in the detector's memory.

• Sensoris its own sensing element that converts the chemical concentration of the measured gas into an electrical signal.

การสอบทานการวัดอุปกรณ์วัดแก๊ซรั่ว

มีการวัดสอบทาน 3 อย่าง คิอ

1. Bump test
2. Zero calibration (also known as fresh air calibration)
3. Span calibration

สาเหตุของความคาดเคลื่อนของอุปกรณ์วัดแก๊ซรั่ว (Calibration Drift)

When a gas detector’s reference point slowly changes, it is called calibration drift. This drift occurs to all sensors over time and leads to unreliable readings. Sensors that have experienced drift can usually still measure the quantity of gas present. However, they cannot convert the information into an accurate reading. Calibration checks with traceable gas concentrations will verify or update the device’s reference point. These checks should be completed often – daily in some instances.

สาเหตุของการวัดคลาดเคลื่อน

Operators of gas detectors should also be aware of common causes of calibration drift to minimize potential drift. These include:

• Degradation due to phosphate exposure

2     Degradation of phosphorus- or lead-containing components

• Expected, gradual chemical degradation of sensors
• Use of the detector in extreme environmental conditions. This includes extreme temperatures or humidity and high concentrations of certain airborne particulates
• Exposure to high concentrations of target gases and vapors
• Exposure of catalytic hot-bead LEL sensors to silicones, hydride gases, halogenated hydrocarbons, and sulfide gases
• Exposure of electrochemical toxic gas sensors to solvent vapors or corrosive gases
• Exposure to high amounts of vibration or shock that may affect electronic components and circuitry

The detector’s operability should be verified when it has been exposed to any of these conditions. It should also be verified if exposure is suspected. It’s also crucial to keep in mind that even though a gas detector sensor may appear unharmed, it could have damage that is not visible.  

สาเหตุที่ Sensors มีความไวลดน้อยลง (Sensor Sensitivity Degradation)

Many environmental conditions may degrade sensor response, including the following. LEL sensors are inhibited or poisoned by silicon compounds (some lubricants), sulfur compounds (e.g., H2S), lead (Pb) compounds, acids, and compounds that generate acids on combustion, like chlorinated hydrocarbons. Electrochemical sensors are affected by high levels of organic vapors and by corrosive gases. Ammonia, chlorine, and chlorine dioxide sensors lose response upon overexposure to NH3. PID lamps can lose output by a) simple aging, b) by becoming coated when exposed to excessive dust, high-boiling compounds, phosphine, organic amines or silazanes, or c) by contact with liquid water. And any sensor will lose response if sample gas does not adequately reach it because of leaks in the sample train or plugging of inlet dust filters. Thus, although most instrument will hold calibration for several days to several weeks, it is a good idea to check their accuracy regularly.

อะไรมีผลต่ออายุการใช้งานของ Sensors (Effect of life sensors’ life)

It is very different for every sensor, depending on humidity, temperature, dust, frequency of exposure and many other factors. Prolonged exposure of the measured gas can even destroy some sensors. As well as exposure of gases with a concentration greater than the range of the sensor. This often happens when using detectors near sinks or when disinfecting and cleaning.

In addition, most sensors are not selective and detect a wide range of gases. Thus, even if the detector is calibrated, for example, to detect methane, it can simply be destroyed by an open can of paint near the detector. Solvent fumes then enter the sensor, triggering a false alarm and soon oversaturating and destroying it.

Sensor's aging can be slowed down by disconnecting it from the power supply. An unplugged sensor ages much slower than a powered one. It is therefore possible to store the detectors for up to 6 months without recalibration and still perform the first recalibration after 12 months from plugging in.

การสอบทานการวัดหมายถึง (Gas calibration mean)

Technically, calibration is the comparison of measurement values delivered by a device under test with those of a calibration standard of known accuracy. Simply put, to ensure your gas monitor can detect gas levels accurately, it must first be calibrated.

When we are dealing with specific gasses, carbon dioxide in this instance, calibrating the monitor means exposing the device to a known concentration of test gas or calibration gasses for a set amount of time – this reading then becomes the reference point for future readings.

ทำไมต้องตรวจสอบทาน (Why do gas sensors need to be calibrated?)

Neglect or improper calibration can lead to inaccurate gas readings which in turn could put you and anyone else in the area in severe danger. It can also cause extra costs to the business with unnecessary downtime due to false alarms.

Calibrating your gas monitor on a regular basis helps to avoid any calibration drift that could otherwise occur, keeps accurate gas concentration readings and demonstrates that worker safety is a key priority.

Maintaining a clean air environment is key to ultimately prolonging life. If you are regularly operating in a harmful environment, both short and long term effects could prove to be extremely negative or even fatal

As mentioned above, maintenance and recalibration of detectors is usually mandatory by law and if you do not comply with this obligation and the procedures set by the manufacturer, you may lose not only the warranty, but also the right to indemnity in the event of an insured event.

Maintenance of gas detectors varies according to their type and manufacturer. For example, Honeywell small home detectors are not calibrated, but are discarded at the end of their service life. For other types following is necessary:

• regular recalibration,
• sensor replacement at the end of its service life,
• regular functional tests and inspections of the protective dust filter.

The minimum intervals for these are always specified by the manufacturer and must be met. Service, functional tests and calibration of gas detectors may only be performed by qualified professionals and services authorized by the manufacturer.

In addition to calibration, do not forget to regularly inspect gas and your gas appliances, the cost of which is negligible compared to the risk of explosion.

การตรวจสอบทานซ้ำ (Recalibration of gas detectors)

The method varies depending on the type of detector and manufacturer. Detectors are calibrated annually and require calibration gas and calibration software. There are two ways to recalibrate these detectors. The first is the correspondence recalibration. The operator disassembles the detector and sends it to the manufacturer or distributor for recalibration. They feed and recalibrate it for 48 hours. After recalibration, they send it back to the operator. The second option is to contact one of the trained calibration partners.

การเปลี่ยน Sensor (Sensor replacement)

The sensor may only be replaced by a trained person. Exceptions are semiconductor, optical, and photoionization sensors that are replaced by the manufacturer because they require tampering with the detector firmware. Electrochemical and catalytic sensors can be replaced simply by disconnecting the connector. After replacing the sensor, it is necessary to calibrate the detector.

การทกสอบการทำงาน (Functional test)

In addition to regular recalibrations and sensor replacements, functional tests are also performed. The first is during the installation of the device, after starting and stabilizing the measurement, test gas is released on the sensor and the detector's response is monitored. Further functional tests may be performed by the safety technician in an internal regulation.

การตรวจเครื่องกรองฝุ่น (Check the protective dust filter)

During the functional test and recalibration, the protective dust filter, which protects the sensor, is also checked for clogging. Running detectors without this filter reduces their life and will void the warranty. The filter is made of a special several-layer laboratory paper. At the same time, it often happens that customers confuse it with a plastic cover and throw the filter away

การสอบทวนอุปกรณ์วัดแก๊ซรั่ว (Gas detector calibration)

Gas detector calibration is a technical procedure performed every 6 to 12 months to ensure your device is functioning accurately.

• Over time, gas detectors and their respective sensors degrade at different speeds.The only way to ensure accurate and repeatable measurements is through gas calibration.
• Gas calibration involves exposing your detector to a traceable concentration of test gas.
• In the USA, certified gas standards come from the National Institute of Standards and Technology (NIST).

ATEX, IEC, British HSE, and US OSHA standards all call for the bump test and calibration of any gas detection instrument used for worker health and safety protection in a potentially hazardous environment.

To calibrate a gas detector, ensure you have the following:

• Calibration cap:When required, calibration caps are included with the purchase of a detector.
• Gas bottle:Recommended calibration gas bottles.
• Regulator:Recommended gas bottle regulator 0.5 - 1.0 LPM.
• Tubing:Recommend 1/8" ID silicone tubing.
• If you have a gas detector with a built in pump (FD-600, FD-311), then you will also need to purchase a T-pieceto calibrate.
  We do not offer bump gas for highly reactive gases such as ammonia, phosphine, nitrogen dioxide, and chlorine. In this case, we recommend purchasing 34 L calibration gas bottle to be used as bump gas.
• Be aware of OSHA requirements regarding bump testing and calibration.
• Be aware of the International Safety Equipment Association (ISEA) requirements regarding bump testing and calibration.

A zero calibration should always be done first before a span calibration

ความถี่ของการวัดสอบทาน (Frequency of calibration)  

การวัดอาศัยการเปลี่ยนแปลงทางเคมีและฟิสิกส์ของวัสดุทีตัววัด ซึ่งจะเสื่อมที่น้อยไปตามอายุการใช้งาน จะต้องวัดการเปลี่ยนแปลงนี้จะต้องทำเทียบกับค่าที่จะวัด (Measured value) เพื่อทำการสอบทวนใหม่ (Recalibrate) การกำหนดความถี่ในการวัดจะกำหนดโดย

According to AS/NZS 60079.29.2:2008 (Gas Detectors – Selection, installation, use and maintenance of detectors for flammable gases and oxygen), gas monitor should be regularly calibrated by a competent person according to the manufacturer’s instructions Calibration Frequency

The ISEA (International Safety Equipment Association) and ATEX recommend the following general procedure:

1. Typically suggest 6 to 12 months.

This time period is typical for gas detectors employing electrochemical or catalytic bead sensor elements.

2. Calibrate more regularly if:

• The user is employing the device as an analytical tool where accuracy is paramount.
• The device is used in an extreme environment (temperature and humidity).
• The user is performing an imminently dangerous application. Calibration and bump testing is mandatory since imminent injury or death will occur if the device fails.
• Follow best practices and bump test regularly to ensure reliable operation.

1a) A daily “Bump Test” before the instrument is put into use. Calibrate gas detection equipment just long enough to make the sensor(s) alarm, to ensure that the gas is getting to the sensor and that both the sensor and alarm are working. The gas does not need to be of a well-defined concentration and could be as simple as a permanent marker.
or
1b) A daily Calibration Check before the instrument is put into use. Calibrate gas detection equipment using calibration gas to see if the sensor responds within predefined error limits, typically within 10-20% of the expected value, as set by manufacturer’s recommendation or user’s company policy.

In critical cases where a permit to work is given as a result of a gas test, ATEX recommends that a bump test or calibration check also be conducted at the end of the day’s use to ensure that the instrument was functioning properly throughout the entire monitoring period.

2) Full Calibration if either the bump test or calibration check fail. A Full Calibration should also be conducted at regular intervals as recommended by the manufacturer, user’s company policy, or regulatory agency.

During initial use in the target environment calibration should be checked frequently. The time period should cover all expected environments the instrument will be subjected to. If the instrument maintains calibration over this time, the interval between checks can be extended. In this way, one can define the most suitable calibration frequency for a particular site or application.

In addition, the above test procedure should be conducted if any special circumstances occur that might affect sensor function, including, but not limited to:

• Frequent exposure to high or low temperatures, pressures, and humidity, to high particulate levels, or immersion in a liquid.
• Exposure to high (over range) concentrations of target or similar chemicals.
• Frequent exposure to sensor inhibitors and poisons, as described above.
• Exposure to harsh physical vibrations or shock.

ความถี่ในการทำ Bump test (Frequency for Proof test or ‘bump test’)

It is recommended that a proof test should be carried out at least once every 12 months, working at typical performance, with fixed temperatures, humidity and pressure. Adjustments may be required. This applies to both the CO2 and the O2 sensors.

If the device fails a proof test, zero and span calibration will be needed.

ข้อแตกต่างระหว่าง Calibration and a proof test

The main difference is that a proof test measures the accuracy of the sensor and calibration resets the sensor to ensure that it is measuring accurate readings.

กฏเกณฑ์การทำ Sensor to proof tested or calibrated

Here is a helpful guide to show when you would need to proof test or go straight into a calibration.

By using the best practice of annual maintenance with calibration proof tests, checking for drifts, and using the correct test gasses, the CO2 sensor will always give accurate readings and demonstrates that worker safety is a key priority.

The adjustment of the minimum recalibration frequency in the manual is determined on the basis of the sensor used. For conventional electrochemical and semiconductor sensors, it is usually 6-12 months. For more robust types of sensors, such as optical NDIR sensors, the minimum interval is longer, from 1 to 5 years. The lifetime data is therefore only an approximate estimate based on experience.

การทำ Bump Test (or Function Check)

This is a qualitative function check in which a challenge gas is passed over the sensor(s) at a concentration and exposure time sufficient to activate all alarm settings. The purpose of this check is to confirm that gas can get to the sensor(s) and that all the instrument's alarms are functional. The bump test or function check does not provide a measure of the instrument's accuracy. When performing a bump test, the challenge gas concentration should trigger the DRPGM's alarm(s).

มาครฐานของการทำ Bump test

การจดบันทึกผลของ Bump test

การสอบทาน  (Calibration Check or Full Calibration)

There are two methods for verifying DRPGM accuracy: a calibration check and a full calibration. Each method is appropriate under certain conditions.

A calibration check verifies that the sensor(s) and alarms respond within the manufacturer's acceptable limits by exposing the instrument to a test gas. The operator compares the reading to the test-gas concentration (as indicated on the cylinder containing the test gas). If the instrument's response is within the acceptable range of the test-gas concentration (typically ± 10-20% of the test-gas concentration), then the calibration check verified the instrument's accuracy. (Note: OSHA recommends that operators check with the instrument's manufacturer for the acceptable tolerance ranges.) An operator should "zero" an instrument (reset the reference point, in some cases "zero air" gas may be needed) before conducting the calibration check to ensure that the calibration check results are accurate. When performing a calibration check, the test-gas concentration should be high enough to trigger the instrument's alarm(s).

If the calibration-check results are not within the acceptable range, the operator should perform a full calibration. A full calibration adjusts the instrument's reading to coincide with a known concentration (i.e., certified standard) of test gas. Test gas used for calibration gas should always be certified using a standard traceable to the National Institute of Standards and Technology (NIST).³

การตัดสินใจว่าจะทำ Bump test หรือ Full calibration (Determine of Perform a Bump Test and When to Perform a Full Calibration)

In the past, there has been some confusion regarding proper calibration procedures and frequency. To clarify this issue, ISEA updated its position statement on instrument calibration in 2010, stating, "A bump test . . . or calibration check of portable gas monitors should be conducted before each day's use in accordance with the manufacturer's instructions." If an instrument fails a bump test or a calibration check, the operator should perform a full calibration on it before using it. If the instrument fails the full calibration, the employer should remove it from service. Contact the manufacturer for assistance or service.

กฏของการวัดสอบทาน (Calibration Rules)

The following are a few basic calibration rules for DRPGMs:

• Follow the manufacturer's guidelines for proper calibration. Operators cannot perform any job, including DRPGM calibration, properly or safely without the right tools. The type and concentration of calibration test gas, sample tubing, flow regulators, and calibration adapters are key links in the calibration chain. Operators should conduct any testing to verify the operation of the gas monitor in an environment that is the same as (or similar to) the working conditions (e.g., temperature, humidity, atmospheric pressure).
• Only use a certified traceable test gas, and do so before its expiration date. The instrument can only be as accurate as the test gas used to calibrate it. Be certain that the supplier can provide a certificate of analysis for every test-gas cylinder. The concentration of the test gas, particularly reactive gases such as hydrogen sulfide and chlorine, will only remain stable for a limited period. Never use a test gas after its expiration date.

Train DRPGM operators on the proper methods of calibration. Most instruments are designed to be field calibrated with detailed instructions provided in the manufacturer's user manual, training videos, or computer-based training modules. Employers should train and test everyone responsible for performing DRPGM calibration.

(Direct-reading portable gas monitors, "DRPGMs" or "instruments").

The best way to verify that a DRPGM detects gas accurately and reliably is to test it with a known concentration of gas. This procedure will verify whether the sensors in the instrument respond accurately and whether the alarms function properly.

• The International Safety Equipment Association (ISEA), founded in 1933, is a trade association for manufacturers of protective equipment, including DRPGMs. The ISEA recommends, at a minimum, verifying the operational capability of these instruments before each day's use, with additional testing conducted as necessary. This SHIB incorporates recommendations developed by the ISEA.

• OSHA recommends developing standard procedures for gas detector calibration. Recommendations include documentation to support the proper maintenance and timely calibration of these instruments. Gas detector calibration refers to an instrument’s measuring accuracy relative to a known traceable concentration of test gas. The detector compares the sensor’s response to a known concentration of test gas. To confirm the accuracy of the response, it’s crucial to use calibration gas that has not expired.

• Gas detector calibration should be completed in environmental conditions that are the same (or similar to) the actual workplace conditions. This process is recommended because detectors may have sensitivity to temperature and humidity variances.

• Regular gas detector calibration should also conform to the manufacturer’s instructions. In addition to this, company policy and any appropriate agency guidelines should be followed. This level of detail can ensure that proper gas detection calibration procedures are followed. These procedures ensure the gas detectors operate and are accurate when needed.

• Gas detector calibration records should also be kept for every single instrument. A record for each device allows operators to identify any gas detectors that have needed excessive repairs or are prone to erratic readings, and to track the drift of sensors to determine when they need replacement.

• Ozone (O3) is unique gas and cannot be calibrated with a calibration gas bottle setup like most gases.
• Ozone is an unstable gas and therefore cannot be stored at a fixed concentration in a gas cylinder. Ozone must be generated on-site.
• The generated ozone concentration must be calibrated to a NIST traceable source.Only a few laboratories in the USA have the expensive, NIST calibrated equipment necessary to perform ozone gas detector calibration.

Frequent calibration is often necessary for gas detectors, including NDIR and catalytic bead sensors. The Molecular Property Spectrometer™ (MPS™) can help organizations save money without sacrificing accuracy. These sensors have a longer life expectancy (up to ten years) than other types of gas detectors. They also do not require recalibration, which lowers the total cost of ownership of the MPS sensors.

The MPS sensors are also extremely tolerant of environmental fluctuations and extremes. This represents a tremendous advantage over other gas detection technologies. Other methods can provide inaccurate readings even with small environmental changes and require frequent gas detector calibration. MPS sensors are a great tool to ensure that your workplace remains safe. Their accuracy means that everyone in the vicinity will know immediately if flammable or combustible gases are present. And accuracy is achieved even without recalibration. MPS sensors are the next generation of gas detection technology.

There are a few basic rules when it comes to gas detector calibration, such as:

• Follow the manufacturer’s guidelines.
• Use the correct tools for the job.
• Calibrate in environmental conditions that mimic the workplace.
• Only used a non-expired certified traceable test gas. The test gas supplier should be able to provide a certificate of analysis for every test gas cylinder. Since the concentration of test gases does not stay stable forever, it is crucial not to use test gases that have passed their expiration date.
• rain operators how to properly perform a calibration.

Operators may conduct a bump test, also called a function check, to confirm the detector’s alarms are functional. This test does not measure the device’s accuracy, but it should verify the alarm is working.

Additionally, full calibration of the gas detector may not always be necessary. A calibration check can verify that the sensor and alarm are working properly when exposed to test gas. The device should first be “zeroed” to ensure results are accurate. And the concentration of test gas used should be high enough to trigger the alarm. If the reading is in the acceptable range, the calibration check has verified the accuracy. If the results are not in the acceptable range, a full calibration is necessary. Full calibration adjusts the reading to coincide with a known concentration of test gas.

บริษัทไอดีล (Ideal Quality Solutions Co., Ltd) มีบุคคลากรที่มีความรู้ ความชำนาญ และประสบการณ์ในการออกแบบระบบ คัดเลือกอุปกรณ์ ติดตั้ง ตรวจสอบ ทดสอบ ตรวจทาน (Calibration) และบำรุงรักษาระบบระบบตรวจสอบแก๊ซรั่วที่ได้รับการฝีกอบรมด้านความปลอดภัยในการทำงานกับระบบแก๊ซ และผ่านการอบรมเรื่องออกแบบระบบ คัดเลือกอุปกรณ์ ติดตั้ง ตรวจสอบ ทดสอบ ตรวจทาน (Calibration) และบำรุงรักษาระบบ Gas detector จากบริษัทผู้ผลิต ไอดีลสามารถทำการตรวจสอบทาน Gas detector ทุกชนิดและของทุกๆแบรนด์

ไอดึลรับบริการทั่วประเทศไทย การทำงานจะอ้างอิงและปฎิบัติตามกฏหมาย (Law and regulation) มาตรฐานทางอุตสาหกรรม (Code and standard, ie, NFPA, OSHA, IEC, ..เป็นต้น) และข้อปฎิบัติที่ดีในอุตสาหกรรม (Best practices in industries)

ไอดึลยังเป็นตัวแทนจากผู้ผลิตในการบริการจัดจำหน่ายอุปกรณ์ Gas detector แบรนด์ MSA, GM, Gassonic, Senscient, GDS Instrument,…etc. ที่มีชื่อเสียงระดับโลก มีใช้อย่างกว้างขวางในอุตสาหกรรมของประเทศไทยและทั่วโลก

สนใจติดต่อใช้บริการ ขอคำปรึกษา ติดต่อบริษัทไอดีล ควอลิตี้ โซลูชั่น จำกัด