Gas Detector and Monitor FAQs

Welcome to the GasDog FAQ page, dedicated to answering all your questions about detecting and monitoring various gases. Whether you're interested in the functions of our gas detectors, the types of gases they can detect, or the specific environment of gas monitoring, you'll find the answers you need here. Before reaching out to our expert engineering team, we invite you to explore these resources to enhance your understanding and utilization of GasDog gas detectors and monitors.

Gas Detection Frequently Asked Questions

Should you have any concerns about how GasDog gas detectors transmit data, how they are charged, or if you're seeking clear calibration procedures, we've got you covered. Our comprehensive Q&A addresses these specific inquiries, providing detailed insights and practical guidance to ensure you fully understand Gas Dog gas detectors and can use them effectively in your gas detection projects.

1. Output Signal
Q: What’s the necessity for an output signal option for a multi-gas detector?
A: To be able to connect the gas detector to your computer via USB for data downloading and printing.

2. Wireless Function
Q: Can you add a wireless function to your handheld gas detector, so can get the data directly to my PC?
A: Yes, we can add the wireless module to the handheld gas detector, so you can monitor and record data on your PC.

3. Fully Charged
Q: How long does it take to get your gas detector to be fully charged?
A: Charging time is 5-6 hours to be fully charged.


4. Working Pressure
Q: Do your gas detectors work in a pressure 1-5 bar or 7-8 bar environment?
A: No, for the pressure 1-5 bar, you need to reduce the pressure to less than 1bar, because our gas detector can only withstand the pressure within 1bar. So, you need to add a pressure-reducing valve before the monitor.

5. Calibration Kit
Q: For the Gas Dog gas detector, Is there any calibration kit that I need to buy or else?
A: GasDog gas detectors have a 1 year (365 days) warranty. Usually, the gas detector needs to be calibrated once a year or half a year, it can be calibrated at any local calibration institution or you can send it to us for calibration. The calibration fee is $ 75 for one time. So it is recommended to purchase a calibration kit. We provide 2 kits; copper kit and stainless steel kit.

6. Logging Gas Data
Q: How can your portable gas detector log data?
A: It automatically saves gas ppm values, and this data can be downloaded to the computer via the provided software and USB connectivity.


7. Measuring Gas in the Pipe
Q: Which nozzles are included or can be purchased for the gas detector? (I would like to be able to measure the gas at a sample point inside a 200 mm wide pipe.)
A: Our gas detectors have a suction pump and do not require nozzles, but we can also provide a 6mm diameter straw with a length of about 1 meter to help in the detection process.

8. Pumping Speed and Measurement Sensitivity
Q: I am very interested in better understanding the different pumping speeds on your H2 gas detector. Your literature indicates that ten different speeds can be selected. Do you have any information on the different actual flow rates associated with these different settings and how using the different settings impacts the measurement sensitivity?
A: Our gas monitor pumping speed is 750ml/min, and both flow & pumping speeds will not affect measurement sensitivity.

9. Data Download Frequency
Q: With your portable gas detector, is it possible to download data via the USB port every 5 or 10 seconds? Or is the frequency lower? If there were a way to provide a download every 5-10 seconds, that would resolve our issue.
A: Yes, with the portable detector, you can download data via the USB port every 5 or 10 seconds, and the frequency lower time is every 5 seconds. Data will be downloaded and transferred as an Excel file, and then you can open the file on the PC to view detected values.

Gas Detector FAQs by Gas Types

The following frequently asked questions and answers for GasDog gas detectors are organized by gas type. Whether it's Chlorine (Cl2), Hydrogen Sulfide (H2S), Hydrogen (H2), Nitrogen (N2), or other gases you're interested in, we've compiled answers to common questions.

Ammonia (NH3) Gas Detector

1. Ammonia Gas Detector for Soil Samples
Q: I don’t what Ammonia concentration to expect in soil gas samples. Maybe I should get the 0-100ppm instrument since it has the same resolution and sensitivity as the 0-50ppm instrument? I would like to see +/-0.1ppm at 1ppm levels of Ammonia.
A: For our Handheld Ammonia (NH3) gas detector, range 0-50ppm, resolution: 0.01ppm; range 0-100ppm, resolution: 0.1ppm. Please confirm whether you choose the range of 0-100ppm or 0-50ppm. The specific measurement range still needs to be confirmed according to the concentration of NH3 in the soil.
Please note that to measure the NH3 gas concentration in the soil, you cannot directly insert the gas detector into the soil for measurement, you need to put the soil into the bag first, and then measure the Ammonia concentration in the bag.

2. NH3 Gas Detector Installation
Q: We are currently trying to install the NH3 gas monitor that we purchased at GasDog a few weeks ago. I am contacting you because the detector does not seem to detect any Ammonia and I would therefore like to ask for some clarifications. We would like to connect the sensor to a line in which a mixture of Hydrogen and a few ppm of Ammonia are flowing. What is the suggested flow rate for the detector to be able to correctly take a sample of gas?
A: If there is water in the pipeline, it will affect the detection of the NH3 gas detector. If there is Ammonia in the pipeline, the NH3 gas detector will read. We recommend a flow rate of 750ml/min.

Carbon Monoxide
(CO) Gas Detector

1. Handheld CO Gas Detector in Hydrogen-rich Environments
Q: I was wondering if the handheld Carbon Monoxide (CO) gas detector would work in a Hydrogen-rich environment.
A: Generally, H2 and CO gases interfere with each other, and all sensors in the market can not do measurements without some little interference. However, our gas detector sensor is of high quality, and the relative interference will be much smaller.

Carbon Dioxide (CO2) Gas Detector

1. CO2 Monitor for Bioreactor Application
Q: We are looking for a 0-100% VOL CO2 monitor and I would like to know if the fixed Carbon Dioxide (CO2) gas detector is suited for the following application:

We are developing a pilot-scale bioreactor producing VFA’s from Hydrogen and CO2. We feed a gas mixture of 20% CO2 in H2 to the bioreactor, which will accumulate in the headspace of the reactor. Due to the biological processes within the reactor, the headspace can contain a significant amount of methane. The gas in the headspace is continuously recirculated (taken from the headspace and sparged back into the reactor from the bottom) using a diaphragm pump. From this main recirculation line, a second gas line diverges which will contain the in-line gas sensors. The flow in this second line will be 0.2 L/min and the gas will be dried before it reaches the gas sensors.

We need the CO2 sensor to:

  1. Be able to detect 0-100% VOL CO2.
  2. Be ATEX (zone 2) rated (we are dealing with 80% Hydrogen).
  3. Be able to measure in-(gas) line, not for atmospheric measurements.

Let me know if you have any questions concerning our application. If you think any of your instruments are suited for our application, could you provide me with a quote? This will be with a 4-20mA output, 1NO+1NC relay, European plug, and calibration kit.

A: We recommend GD300-CO2, please select 100%VOL for the range.

2. GD300-CO2 for Flow-Through CO2 Detection
Q: We are looking for a 0-100% VOL CO2 sensor that can be implemented in a flow-through gas design using a threaded connection. Reading the literature for the GD300-CO2, it has the capability of a flow-through configuration that has been designed for calibration. Can this work for detecting CO2 gas in a flow-through scenario as well? Is there a limitation on the flow rate if we were to use it in this capacity?

  1. 1. The GD300-CO2 detector has a threaded connection to the pipeline.
  2. The fixed gas detector can detect CO2 gas in a flow-through scenario.
  3. The pressure in the detected pipeline should be controlled at a stable 1 bar, and the flow rate should be stable at 1L/min.

3. Combined H2S and CO2 Pump Monitor
Q: I need pump-type detector.

  1. Do H2S and CO2 detectors come in one unit?
  2. What is the shortest sampling time?
  3. What is the memory size (how many data points it can record before getting full)?


  1. 1. The gas H2S (0-500ppm) and CO2 (up to 5%) detector can be provided in one unit.
  2. The gas detector is a pump-type detector, and the shortest sampling time is less than 10 seconds.
  3. It can record ten thousand data points.

Chlorine (Cl2) Gas Detector

1. Portable Chlorine(Cl2) Gas Detector Calibration
Q: How often are we supposed to perform the Target Point Calibration (TPC) for the portable Chlorine (Cl2) gas Detector?
A: It is supposed to perform the TPC annually but if use frequency is high, we recommend performing it every six months. We provide a one-year warranty.

2. Chlorine Gas Detector for Room Detection
Q: I have a question about the operation of the portable Chlorine detector: Can this device detect Chlorine gas in the environment of a room? For example, if I enter a room where there is a presence of 1ppm Chlorine gas, the device will give me an alarm without connecting to any auxiliary device.
A: Yes, of course. The detection range is 10-15 meters. And it sounds the alarm, No need for an auxiliary device.

Hydrogen (H2) Gas Detector

1. Hydrogen Gas Detector Continuous Monitoring
Q: For your Hydrogen gas detector, Does it continuously check the hydrogen leakage automatically or do we need to check it manually? Can we use this device for continuous monitoring of the hydrogen leakage 24x7?
A: Yes, it continuously checks the hydrogen leakage automatically. And, you can use this device for continuous monitoring of the hydrogen leakage 24x7.

2. Detecting Hydrogen Leakage in Natural Gas Systems
Q: I am involved with a project where we are researching blending a small percentage of Hydrogen into a natural gas distribution system. I found your portable Hydrogen sensor while looking for a Hydrogen detector that could help us confirm whether or not Hydrogen is leaking out of joints where natural gas is not. Could you help me confirm if this would be a suitable use for the detector? If it is, do you have a recommendation on a measuring range?
A: Yes, you can use our portable Hydrogen (H2) gas detector to measure H2 leakage, and the recommended range will be: 0-1000ppm.

3. Will CH4 Interfere with H2 Gas Detection?
Q: I am interested in a Hydrogen gas detector (portable Hydrogen (H2) gas detector, 0 to 500/1000/2000ppm) for characterizing leaks from a mixture of Methane and Hydrogen. Will the CH4 interfere with H2 gas detection? We will be mixing methane and H2 at ratios from 5% to 25% H2. We will be using the detector to look for the presence of Hydrogen (leaks, etc.). We will be using separate equipment to measure the level of methane.
A: CH4 will not interfere with H2 gas detection, and you can use our (H2) gas detector 0-1000ppm (accuracy 1ppm), to measure H2 leakage, with No problem.

4. Hydrogen (H2) Gas Detector Cross Sensitivity
Q: Would like to know what cross-sensitivity this model has. We work in a facility where we use acetone and ipa to clean parts and our current LEL monitor is picking this up and not instilling confidence in our measurement of H2 around the special atmosphere furnace.
A: If you want to measure H2 gas in your below gas environment, then yes, we recommend using model SKU: GD200-H2 with a 0-1000ppm measuring range, which has no interference with other gases and will not interfere with others.

5. Interaction of Hydrogen (H2) and Ammonia (NH3) in Gas Detection
Q: We get surprising results when using our Gas Dog H2 gas detector in an atmosphere where NH3 is present. Is there a known interaction of the H2 measures provided by the sensor in the presence of NH3? For instance, if we have 1ppm of H2 and 1ppm of NH3, which value will the sensor read?
A: Under normal circumstances, H2 and NH3 gases will not interfere with each other. Are there other gas components in your use environment? For example, H2 and CO, H2S and other gases will react and interfere with each other.

6. Mounting for Gas Detectors in Pressurized Gas Systems
Q:I am considering the GD300-N2 and the GD300-H2. Can the sensor be placed in line tubing with pressurized gas? or is this for atmosphere detection only? or is there a way to mount the detection point in line with the gas flow?
A: In this case, you need to reduce the gas pressure in the pipeline to 1Bar±10% before it can be used normally, such as installing a pressure regulating device on the pipeline.

7. H2 Gas Detector with a Lower Detection Range
Q: Can you provide an H2 gas detector with a lower detection range and high resolution 0.001 and high accuracy +/-2% full call?
A: Yes, we can but the price will be higher than the existing on the website, just state the requested specs, so can check and quote.

8. Measuring H2 Gas in Air
Q: Can we use your Hydrogen gas detector to measure Hydrogen in Air by selecting the 0-100%VOL option?
A: No, the range 0-100%VOL is usually used to measure the purity of H2 in a single gas, so it is not suitable for measuring H2 in an air mixture.

9. Measuring H2 in Oxygen-Free H2/N2 Mixtures
Q: I need to verify that your Hydrogen (H2) gas monitor with 0-100% LEL will work when measuring against only a two-gas mixture of H2/N2 and does not require the presence of Oxygen.
A: Yes, and we recommend a Hydrogen (H2) Gas Detector with 0-100% LEL option, SKU: GD200-H2. Only H2 can be measured, and N2 does not affect the measurement.

10. Interference of CO in Hydrogen Gas Detection
Q: I have a technical inquiry regarding your portable H2 gas detector (0-2000ppm): what other gases can cause interference with the detection of Hydrogen in this sensor? For example, we'd like to monitor Hydrogen (0-2000ppm) in an exhaust gas stream that contains 73% N2, 12% O2, 10% H2O, 5% CO2, 2000ppm CH4, 500ppm CO, 500ppm NO and 750ppm NO2. Would the detector foul with these gases present?
A: CO will interfere with the H2 detection. If there is 500ppm of CO in the environment, then even if no H2 exists, the H2 gas detector reading will show 2000ppm.

11. Portable H2 Gas Detector for Industrial Use
Q: I found your portable Hydrogen gas monitor while doing some research online and I believe it will be a good fit for our needs, but I have a few questions to confirm. I’m a technician for an industrial gas company and I service liquid and gaseous Hydrogen tanks and equipment at our customer sites. I’m looking for a portable detector that I can use intermittently while at a site with Hydrogen equipment that will not require a bench calibration before each use. The monitor would be used outdoors to detect possible leaks on our systems either for leak detection or continuous monitoring during work in proximity of the Hydrogen system. I can be reached by email or by phone at the number in my signature below.
A: If it is only used to measure leaks, we recommend portable H2, 0-500ppm, SKU: GD200-H2. Our gas detector has been calibrated with H2, you don't need to calibrate it every time you use it.

12. GasDog H2 Gas Monitor Calibration
Q: I have two questions about the H2 gas detector. The first issue is that I am using a 400ppm gas standard to do my set point calibration, the highest H2 level the meter detects varies from 46ppm to 57ppm. The concentration the meter detects is much lower than the one in my gas standard. The second issue I am having is that the manual SET VALUE does not allow me to go passed 166ppm.
A: 1. Please confirm whether the unit of the meter is ppm or mg/m3. If it is mg/m3, it cannot be calibrated, and the unit must be set to ppm. If the unit of meter is ppm, please change it to 400ppm.

13. GD200-H2 Detection Limits and Measurement Frequency
Q: A few questions about GD200-H2:

  1. What is the expected battery lifetime on a full charge?
  2. Can you please explain how I can transfer data from the sensor to a computer with the data-logging capability?
  3. For the 0-10ppm detector, what is the minimum detection limit?
  4. What is the frequency at which successive measurements are taken/recorded? Is this adjustable?


  1. The expected battery lifetime on a full charge was 15-20 hours.
  2. If the instrument has a storage function, the monitor can store historical data and export it to the computer through our host computer software.
  3. For the 0-10ppm detector, the minimum detection limit is 0.01ppm.
  4. The frequency of successive measurements taken/recorded can be adjusted. The storage interval can be 5 seconds, 10 seconds, 15 seconds, etc. The highest interval is 1 hour.

14. Interpreting Hydrogen Monitoring Readings
Q: I have a question about the reporting range for this instrument. The unit is marked % LEL and is designed for Hydrogen monitoring. The LEL for Hydrogen is about 4% by volume. If I get a reading of 0.1% on the meter, how much ppm of Hydrogen does this equate to? Is this 0.1% of the LEL (400ppm), or is it 0.1% by volume Hydrogen (1000ppm), or is it 1/10 of the LEL (4000ppm)? Or is it something else?
A: The H2 gas detector you purchased has a range of 0-4%VOL. For Hydrogen, 4%VOL=40000ppm=100%LEL. So, 0.1%VOL=1000ppm.

15. H2 Detector Measurement Ranges and Alarm Settings
Q: I am writing to inquire about the GasDog H2 monitor on your website. I wanted to know what is the difference between the measurement ranges 0-40,000ppm, 0-4% volume, and 0-100% LEL. Aren't these three ranges the same?
For my application, I need a sensor to operate in the air as a warning safety sensor. Which would be the correct range selection when ordering such a sensor? Does the 0-100% LEL display a percentage value range from 0% to 100% on the screen? Can an alarm be set on the unit to sound at 50% LEL for example?

  1. 0-40000ppm, the display unit is ppm, and the maximum display is 40000ppm;
  2. 0-4%VOL, the display unit is %VOL, and the maximum display is 4%VOL;
  3. 0-100%LEL, the display unit is %LEL, and the maximum display is 100%LEL;
  4. 0-40000ppm and 0-4%VOL versions use electrochemical sensors; 0-100%LEL versions use catalytic combustion sensors.

You can set the alarm value to 50% LEL by yourself, or you can ask us to help you set it directly when leaving the factory.

16. Detecting Hydrogen Tracer Gas Mixtures
Q: I bought a portable hydrogen (H2) gas detector, 0 to 500/1000/2000ppm. Quick question: Can this unit detect a 5% Hydrogen / 95% Nitrogen tracer gas mixture?
A: Yes, this unit can detect a 4% Hydrogen / 95% Nitrogen tracer gas mixture. But please note: The monitor you buy has a range of 0-1000ppm, which can be used to measure leaks, but do not exceed the range.

Hydrogen Sulfide (H2S) Gas Detector

1. GD300-H2S Gas Detector Troubleshooting
Q: We have received and installed the fixed detector GD300-H2S, but are having some issues with it. We are using it to measure the H2S concentration in a pipeline, but have found that it will often read 0.0 even when we know that there is Hydrogen Sulfide in the line. Sometimes it works, but sometimes it doesn't. Do you have any troubleshooting ideas for us?

  1. You mentioned that the gas monitor sometimes works, but sometimes it doesn't, could you please provide a test video for us to confirm further?
  2. Please tell us what your testing environment is specifically. For example, the pressure of the pipeline, temperature and humidity, flow rate, and whether there is liquid in the pipeline.
  3. Our monitor can only detect the gas concentration of air, not liquid; the working pressure can only be stable at 1Bar±10%; the temperature is -20°C~+50°C; the humidity must be below 60%RH, and the flow rate must be below 1.5L/min, and the flow rate should be stable.

2. High H2S Concentration Damage Assessment
Q: Sometimes very high concentrations of H2S will pass through the system (1-2%). While I understand that the system will not be sensitive in this range (well beyond 0-200ppm), is exposure to these high concentrations somehow saturating the cell or destroying the anode or something else?
A: The gas detector cannot be used beyond the range, otherwise it will directly damage the internal detection sensor. So if sometimes very high concentrations of Hydrogen Sulfide will pass through the system (1-2%), this can damage the sensor. Now to confirm whether the sensor is damaged, please check according to the following steps:

  1. Put the gas detector in normal air, and then look at the value displayed by the ADC value (refer to the attached video)
  2. If the ADC value shows -500-500, the sensor is not bad.
  3. When there is H2S gas at the end, check again what is the ADC value and tell us the concentration of Hydrogen Sulfide. This way we can tell if the sensor is bad or not.

Nitrogen (N2) Gas Detector

1. Nitrogen Detection and Monitoring Outdoors
Q: Can we use your Nitrogen gas detector outdoors? Can it trace Nitrogen leakage?

  1. Our Gas Detector (N2) can be used in an outdoor environment, but the temperature range is from -20 ℃ to 50 ℃.
  2. GasDog Nitrogen (N2) detector can only detect the purity of 100% VOL, but cannot detect the ppm with trace leakage.

2. N2 Gas Detector Readings and Pump Operation
Q: When we turn on your N2 gas detector, it shows 78.10 % volume, beep and pump is on what does 78.10% signify? According to manual pump should be turned if we don’t use how to turn off the pump.

  1. Since the concentration of Nitrogen in the atmosphere is 78.10%, the meter will show 78.10% when it turns on.
  2. Please put the detector in clean air for about 5 minutes and wait for the data to fall to normal before turning it off after measurement.

3. Portable N2 Gas Detector MODBUS Connectivity and Calibration Certificate
Q: For your portable N2 gas detector, can you provide The certificate of calibration reference type ISO/IEC 17025? And what about the Modbus connectivity price?

  1. Our Portable Nitrogen (N2) Gas Detector supports MODBUS communication protocol, but for receiving and sending the data, you have to program it yourself, refer to MODBUS communication protocol instructions on our website.
  2. The MODBUS communication protocol is equipped with each portable gas detector, and No additional cost is required.
  3. Yes, the certificate of calibration reference type ISO/IEC 17025 can be provided.

4. Gas Detector for Nitrogen Leakage in Steam Systems
Q: We suspect that some Nitrogen is entering our steam system through leaking valves. I want to test the presence of N2 by cracking a steam valve and putting a sniffer nearby for steam discharge but not in it, will a gas detector work for that?=
A: Yes, if the steam system pipeline is in a normal air environment, which means that the steam discharge port is in the normal air but no other mixed gas, then the unit N2 portable detector 0-100% VOL can work for that, with No problem at all.

5. Gas Detector for Laboratory Experiments with Nitrogen and Helium
Q: We are planning to do experiments with different gases (Nitrogen, and helium) in the lab. Currently, we do not have a working ground suction and are looking for an adequate gas alarm system. Would be your portable Nitrogen (N2) gas detector, 0 to 100% VOL (GD200-N2) the proper instrument for us? Does this system need maintenance regularly?

  1. GasDog portable Nitrogen (N2) gas detector, 0 to 100% VOL, can only be used in a single gas environment, so if the measurement of Nitrogen contains other gas mixtures (such as helium ), it will not be suitable.
  2. Our gas detector is well calibrated before leaving the factory, and usually, it needs to be calibrated after one year.

6. Monitoring Nitrogen Purity in a Generator
Q: We have a Nitrogen generator and we need to monitor the purity of what is being produced. We would be measuring 95-100% Nitrogen. The pressure would be a few hundred pounds up to the high end of 2000, but most likely below 1500. This is in a pump shed and can be 30 degrees F coldest days, to 80-90 degrees F in the summer.
A: We recommend a portable Nitrogen (N2) gas detector, 0 to 100% VOL, but the working pressure of our gas detector can only be 1 bar. So you need to reduce the pressure to 1 bar before measurement can be performed, otherwise, there is no problem.

7. Recommended Portable N2 Gas Detector
I’m looking for an air and Nitrogen leak detector. We have installed some equipment that produces Nitrogen from air and we would like to use a leak monitor (from both air and Nitrogen) to find and fix leaks in the entire system. Please let me know if you have devices that may help me.
A: You can use our portable N2 gas detector, 0 to 100% VOL, but note that it cannot measure below 1%VOL. SKU: GD200-N2.

8. Detecting Nitrogen amidst NO and NO2
Q: Can your N2 detector detect Nitrogen in the presence of other nitrous gases like NO and NO2?
A: Yes, you need to purchase an N2 gas detector (0-100% VOL), and the other Nitrous gases like NO and NO2, will not affect the measurement.

Ozone (O3) Gas Detector

1. Portable Ozone Detector: Calibration, Detection Range, and Directionality
Q: I have a couple of questions about the Portable Ozone (O3) Gas Detector, 0 to 10ppm to be used for ambient Ozone detection: Is calibration required for the device? How often is it required to be calibrated? What is the price for that? Do you have such a service for your Australian customers?

We are going to use this device to detect Ozone gas in our lab environment. What is its detection board? Can it detect the Ozone gas from a 5m distance? or we should be very close to the area with high Ozone concentration? Is it a directional device? Does it mean can device detect the Ozone gas in all directions or it should be held in a specific direction to detect the gas?

  1. The gas detector will be well calibrated before leaving the factory, and you can re-calibrate after 6 months or 12 months based on your usage.
  2. The detection range is 15 meters, so there will not be a problem for 5 meters.
  3. The gas detector has a suction pump, so it automatically absorbs the surrounding gas, so the device detects the Ozone gas in all directions.

2. Continuous Operation of Ozone Gas Detector
Q: For your Ozone gas detector, does the internal pump work continuously? And what is the pump flow speed?
A: As long as the gas detector is detecting, the pump must be on, and the flow speed of the pump is 700mg/min.

3. Portable Ozone Gas Monitor for Point Source
Q: I am looking for a portable Ozone measuring device that can be used at point sources (exhaust stack duct from a corona treater) to take a sample measurement of the air and display the Ozone ppm concentration.
Can you please advise which model would be best suitable for this application (ppm range between 0.04à 5.8ppm)? Do we need to connect an air hose to the measuring device? How frequently does the device need to be calibrated and do you provide that service? Does the device have any data-logging capability?

  1. We recommend portable Ozone (O3) Gas Detector, 0 to 10ppm, the lowest can detect 0.003ppm, see spec and price on:
  2. It is usually calibrated once a year. If you need us to provide calibration services, you need to return it to our factory for calibration at your own expense, and a certain calibration fee will be charged.
  3. This portable gas detector SKU: GD200-O3 can only store historical data on the instrument, and then export the historical detection data to the computer through our host computer software. So you cannot view live data on your computer.
  4. Our gas detector can only have a stable flow rate of 450-600ml/min and a pressure of 1 bar. What is your specific measurement environment? Such as flow, temperature, pressure, humidity, etc.

4. O3 Detector Real-time Data Communication Protocol
Q: We need to use your O3 monitor in a closed-loop system and a PC will have to interface with our controller, not a person. What we need is to be able to read the data from your O3 detector in real-time, and to send these data to our system using a PC. Could you please kindly provide us with the communication protocol so that we may interrogate the O3 detector on the measurement it’s taking in real-time?
A: OK, just note that our portable Ozone (O3) gas detector only has the data logging function. But if you want to communicate your PC via RS485 and view data in real-time, it is recommended to use our fixed gas detector RS485 output (optional). We provide RS485 protocol for such purposes.

5. Portable Ozone Detectors for Lab Use
Q: I want a portable Ozone detector to measure the O3 level in our lab, so it's for room condition: T=20 C and P= 1 atm. I found this model on your website: GD200-O3.
Could you please tell me the minimum amount of O3 this device can detect? I've read the safe limit for Ozone is 20 ppb (= 0.02ppm). I was wondering if you have any detectors that can measure O3 at this level.
My question about O2 or H2 sensors was completely unrelated to the abovementioned detector. I have a burner that I'd like to measure the Oxygen and Hydrogen levels at the exhaust of this burner. The exhaust gas temperature is 500 C, and the pressure is atmospheric. I haven't measured the humidity level, but it should be high as water vapor is a product of the reaction happening inside the burner.
A: For O3 Ozone, we recommend GD200-O3, with a range of 0-1ppm, which can detect as low as 0.003ppm. It has a built-in pump suction type and a high-precision sensor with fast response and high precision. For O2 and H2, O2 range: 0-25%VOL, H2 range: 0-40000ppm. For temperatures up to 500°C, we can provide high-temperature probes.

Oxygen (O2) Gas Detector

1. GasDog O2 Monitor Calibration
Q: We received the GasDog O2 monitor. How often do you recommend calibrating this unit? And what calibration gas and zero gas (if required) do you recommend?
A: This unit has been calibrated before leaving the factory. We recommend calibration once a year, and the password is 2020. You need to use Nitrogen 99.99% VOL for Zero calibration and then pure Oxygen 99.99% VOL for span calibration.

2. Gas Monitors for Water Electrolysis Test Setup
Q: My name is Ryan Seabeck, and I am a researcher at De Nora Tech in Ohio. I have a water electrolysis test setup that generates high-purity H2 and high-purity O2, and I am interested in sensors that can measure the concentration of H2 and O2 in these streams.
I see that Gas Dog has both Hydrogen and Oxygen fixed gas detectors (SKU: GD300-H2 and GD300-O2 respectively), and the specs seem to be close to what we need for resolution and LDL. I have a few questions that I hope you can help me out with.
First, we need to set up our system with a flow-through sensor. I believe these are intended for use in measuring the ambient concentrations of gases, but is it possible to pass our product stream over the sensing unit with a tee fitting or something along those lines? If you’ve ever seen these sensors used in this way, do you know if there’s a specific flow rate we need to maintain? Additionally, what pressure ranges are these sensors able to operate at?

  1. Our gas detectors can only measure air gas, not water and liquid. What environment do you need to test?
  2. Our gas detectors must have a constant flow of 1L/min;
  3. Our gas detectors must have a constant pressure of 1Bar±10%;
  4. Our gas monitors can measure both the gas concentration in the conventional environment and the gas concentration in the pipeline.