Why Multimeter Readings Jump Around
Unstable readings come from the circuit, the leads, the range or the meter. Each has a signature.
Read Article→Learning Center
Plain-language explanations of the measurements, sensors and numbers behind environmental monitoring.
Do You Need a Natural Gas Detector?
If gas is piped into your home and you sleep there, yes. A natural gas alarm covers the hours your nose cannot: while you sleep, when you are congested or away.
Read Article→How Do Gas Leak Detectors Work?
A heated sensing element changes electrically when flammable gas touches it. Fixed alarms compare that to a threshold; sniffers show it as a rising scale.
Read Article→What Is Non-Contact Voltage Detection?
A tester that senses the electric field around a live conductor through the insulation. First check, never the last.
Read Article→How Many Gas Detectors Do You Need at Home?
Count rooms with gas appliances, not square feet: one combustible gas alarm per room that has one, CO alarms on every level, and one sniffer per household.
Read Article→Why Ghost Voltage Appears on a Multimeter
A dead wire that reads 60 volts. It is capacitive coupling, and a low-impedance mode makes it vanish.
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Does Propane Rise or Fall?
Propane falls. It is heavier than air, so a leak sinks, spreads along the floor and pools in low spots, which is why propane alarms mount near the floor.
Read Article→Where to Place a Propane Detector
Mount a propane detector low, within about 12 inches of the floor, in the room with the propane appliance or wherever leaking gas would pool.
Read Article→CAT Ratings Explained Properly: Why CAT IV 600V Can Be Safer Than CAT III 1000V
How much transient energy the meter can survive. It is about where in the installation you are, not the voltage.
Read Article→Does Natural Gas Rise or Fall?
Natural gas rises. Methane is lighter than air, so a leak drifts upward and collects under the ceiling, which is why natural gas alarms mount high.
Read Article→Multimeter vs Clamp Meter: Which Tool Measures What?
Multimeters for voltage, resistance and components; clamp meters for current without breaking the circuit.
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Gas Detector Sensor Types Explained
Four sensor types cover consumer gas detection: semiconductor (MOS) in sniffers and plug-in alarms, catalytic bead and infrared for LEL readings, and electrochemical cells for CO.
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