Can you decide that the GD3000 is suitable based only on a request saying “Please prepare a four-gas detector”? The number four refers to the instrument’s measurement channels; it does not mean that it measures any four substances a site might need. First check which gases the channels measure.
Channels identify measurement targets
The Korean GD3000 user manual lists channels for combustible gas (EX), hydrogen sulfide (H₂S), carbon monoxide (CO), and oxygen (O₂). Each channel is configured to measure a specific target. Compare the substance names in the request with these four channels one by one to see whether the required items are included.
For example, if a request specifies oxygen, CO, H₂S, and combustible gas, you can match those items with the published GD3000 channel names. But if the request says only “four-gas,” you do not know which four items are intended. The gas combinations can differ by model and sensor configuration even for products with four channels, so the product name alone is not enough.
CO and CO₂ are different sensor targets
CO is carbon monoxide; CO₂ is carbon dioxide. The abbreviations look similar and are easy to confuse in a purchase request or verbal handover, but they refer to different gases. A CO sensor measures CO; its reading cannot stand in for or be converted into a CO₂ concentration. The GD3000’s published channel list does not include CO₂, so if carbon dioxide is also required, you can identify a mismatch between the request and the listed channels.
Wording such as “carbon-based gas” can also be unclear. If the requesting department provided only a process or product name, first clarify whether it means CO or CO₂. Matching an accurately named gas in the request to a product channel helps prevent a selection where the channel count matches but a required measurement target is missing.
Matching gas names does not settle other specifications
A matching channel name is only the first comparison. Also confirm the product’s measurement range and unit, measurement method, and any required documents. Oxygen may be displayed in %VOL, toxic gases in ppm, and combustible gas in %LEL. In particular, %LEL is a proportion relative to the lower explosive limit and is not the same scale as %VOL. Do not compare numbers with different units as though they were the same quantity, or treat the product range as a substitute for a site safety criterion.
A purchaser can document where the requested requirements match or differ from the published specifications. Site risk assessments and alarm settings are not decisions to make from a product name alone. Share the gas names in the request and the conditions required of the GD3000 with AI Safety Korea Co., Ltd. so the published channels and items needing separate confirmation can be compared.
Range and unit follow the channel name as additional information
The Korean GD3000 manual lists a range of 0–100% LEL for EX, 0–100 ppm for H₂S, 0–1000 ppm for CO, and 0–30.0% VOL for O₂. These specifications apply to the configuration in that GD3000 manual; they do not automatically apply to another product or sensor option. Even if the channel list matches, separately compare whether the required range falls within the product’s range. “The instrument has four gases” and “the instrument measures each gas across the required range” are different conditions.
Units matter too. ppm and %VOL express proportions in a gas mixture, so 1% VOL equals 10,000 ppm. But the same number, 1 ppm and 1% VOL, represents a very different concentration proportion. %LEL is a percentage relative to a substance-specific lower explosive limit and cannot be equated directly with %VOL. For example, if a product lists H₂S in ppm and EX in %LEL, you cannot compare the endpoint numbers in those rows to decide which measures a wider range.
For product review, gas name, unit, and range belong together. If a request specifies a combustible gas calibration gas or conversion condition, the channel name alone cannot establish that every requirement is met. Comparing the published specification and approving the conditions needed for the work are different tasks; do not reach a conclusion by making an unverified conversion.
When comparing ranges, do not place the endpoint numbers for all four channels on one line and rank them by size. For example, the GD3000 manual lists H₂S and CO in ppm, oxygen in %VOL, and EX in %LEL. Since the units differ by measurement target, the channel with the largest-looking range number is not necessarily the better detector. If the site request specifies units, compare the channel, unit, and range with the product document one row at a time. A matching channel name is not the same as matching every required measurement condition.
When checking a required range, also distinguish a measurement range from an alarm setpoint. The measurement range is the concentration interval the instrument is designed to display; an alarm setpoint is a criterion used to trigger an alert. Confirm the required conditions in the product materials with each item identified by name.