Use an electronic leak seeker to trace a local source, understand its sensitivity controls and recognise failed checks, battery warnings and sensor damage.
Decide what the instrument can tell you
A leak seeker helps find where gas is escaping. Its response is local to the sensing tip. It does not measure the pressure in the pipe, the flow through the meter or the total gas accumulated indoors.
For a numerical concentration such as %LEL, use a monitor designed and calibrated for that measurement. Choose equipment suitable for the gas, location and task. Suspected gas escapes need the emergency precautions first; searching for the source must not delay making people safe.
Following a local response
The Anton AGP45 is one example of an electronic leak seeker. It is intended chiefly for methane-rich natural gas and also reacts to other combustible gases. A signal therefore does not identify the substance by name.
As more detectable gas reaches its tip, the buzzer sounds more frequently and the red indication flashes faster. Keep the sensitivity setting consistent when comparing nearby positions. A stronger response can help trace the source, but it is not a numerical concentration reading.
The UP control increases sensitivity; DOWN reduces it. If the response is strong across several nearby joints, reducing sensitivity can help distinguish the strongest position. Adjusting this control changes the instrument’s response, not the escape rate. Complete the required leak investigation, repair and testing; a reduced tick rate is not evidence of a repaired joint.
Preparing and checking the AGP45
Switch on away from the suspected escape, in uncontaminated air, and let the instrument warm up. The instructions describe about 30 seconds for start-up and 30–40 seconds before the operation check.
During the prescribed check with a suitable gas source, the response should increase on exposure and decrease when the source is removed. Follow the maker’s checking method in safe conditions; do not create an uncontrolled escape for a test. If the expected response is absent, stop relying on the instrument and arrange factory inspection. Its sensor may need replacement. A power light or fresh batteries does not prove that gas detection works.
Battery, storage and time-out warnings
On this model, a flashing green power light means the batteries need changing. Replace them in a safe location clear of the suspected gas escape. Being beside an open window or covering the sensing tip does not make battery work safe in that area.
Protect the sensor from silicone-based products, corrosive gases, water, condensation and freezing. Exposure can damage the instrument; a normal-looking case does not prove the sensing element is sound. Check its condition and operation as instructed.
The AGP45 switches itself off five minutes after the last UP or DOWN button press. It then gives no warning of gas. Do not leave it as an unattended substitute for suitable continuous monitoring or interpret its silence as an all-clear.