Engineering Documents · Free Template
Fixed Gas Detector Data Sheet Template
A data sheet for fixed gas detectors: target gas and its properties, detection technology, range and alarm set points, installation and outputs, with a hint on mounting height from gas density.
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- How to Use sheet with steps
- Template sheet, blank and ready
- Example sheet, filled in
- 2 built in formulas
- A4 portrait print setup
- Works in Excel, Google Sheets and LibreOffice
Preview of the Filled Example
This is the Example sheet from the download, so you can see exactly how the completed fixed gas detector data sheet looks.
ProjectBoiler 3 upgrade
RevisionA
Date24 Oct 2026
Requisition noREQ INST 034
Specification
| No | Parameter | Value | Unit / notes |
|---|---|---|---|
| General | |||
| 1 | Tag number | GD 2201 | |
| 2 | Location / area | Compressor house, near seals | |
| 3 | Detection purpose (leak, area, duct) | Leak detection | |
| 4 | Hazardous area | Zone 1, IIA T3 | |
| Gas | |||
| 5 | Target gas | Methane | |
| 6 | LEL or exposure limit | 4.4 % vol (LEL) | IEC 60079-20-1 |
| 7 | Gas density relative to air | 0.55 | air = 1 |
| 8 | Mounting height (calculated hint) | High: lighter than air | confirm with dispersion study |
| Detector | |||
| 9 | Technology (catalytic, IR, electrochemical, open path) | Infrared point | |
… and 17 more rows in the download.
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About the Fixed Gas Detector Data Sheet
Gas detectors only protect people if they detect the right gas, in the right place, with alarms at the right level. The data sheet links the gas properties, the detection technology and the alarm settings in one place.
How to fill in this template
- Enter the target gas and its LEL or exposure limit and relative density.
- Choose the technology for the gas and environment (IR for hydrocarbons, catalytic for hydrogen and mixed gases, electrochemical for toxics).
- Set the range and alarm levels from the fire and gas philosophy.
- Specify mounting, calibration access and outputs.
- Issue with the requisition.
What the formulas do
- No formulas: specification document laid out in sections like an ISA 20 style data sheet.
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Frequently Asked Questions
Where should a methane detector be mounted?
High, because methane is lighter than air, close to likely leak sources, as decided by the detector mapping study.
IR or catalytic detectors?
Infrared suits hydrocarbons and cannot be poisoned; catalytic detects hydrogen and most flammables but can be poisoned by silicones and needs oxygen.
What alarm levels are common?
Often about 20 % LEL for low alarm and 40 to 60 % LEL for high alarm; follow your fire and gas philosophy.
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