How to Use High, Medium and Low Sensitivity on TASI TA702A Gas Leak Detector Malaysia
How to Use High, Medium and Low Sensitivity on TASI TA702A Gas Leak Detector Malaysia
The TASI TA702A Combustible Gas Detector provides High, Medium and Low sensitivity settings.
Why does a gas leak detector need different sensitivity levels?
Because finding a gas leak is not only about detecting gas.
The real objective is often:
Find the general area → Narrow down the search → Locate the suspected leakage point
Adjustable sensitivity can make this process easier.
What Does Sensitivity Mean on a Gas Leak Detector?
Sensitivity determines how readily the detector responds to combustible gas or vapour.
A higher sensitivity setting is useful when you are beginning an inspection and do not yet know where the suspected leak is located.
However, once you move closer to the source, very high sensitivity can make the detector respond across a larger surrounding area.
Reducing sensitivity can then help narrow the search.
This is why the TA702A provides:
High → Medium → Low
rather than only one fixed sensitivity setting.
When Should You Use High Sensitivity?
Use High Sensitivity when beginning to investigate a suspected leakage area, according to the manufacturer's instructions and applicable safety procedures.
For example, a technician may know that a leak is somewhere around:
Gas Pipe + Regulator + Valve + Machine
but not know which component is responsible.
High sensitivity can help during the initial screening stage.
The objective at this point is:
Find the general area producing a detector response.
It is not yet necessary to identify the exact joint.
When Should You Use Medium Sensitivity?
Once the detector responds and the search area becomes smaller, Medium Sensitivity can help narrow the investigation.
For example, the technician may determine that the response is stronger around:
Valve + Two Nearby Pipe Joints
The probe can then be moved around each component systematically.
Medium sensitivity can make it easier to compare the response between nearby inspection points.
The objective becomes:
Which component should I investigate more closely?
When Should You Use Low Sensitivity?
Where appropriate, Low Sensitivity can be useful when the technician has already narrowed the search to a small area.
For example:
The detector responds around one valve assembly.
The technician then checks:
Valve Connection A
Valve Body / Relevant Inspection Area
Valve Connection B
Nearby Pipe Joint
Reducing sensitivity may help distinguish between closely located potential leakage points.
The objective is now:
Narrow down the suspected source as much as practical.
A Simple TA702A Leak-Tracing Method
Think of the three sensitivity settings as a funnel.
Stage 1 – High
Wide Search Area
↓
Find the general location.
Stage 2 – Medium
Smaller Search Area
↓
Compare individual components.
Stage 3 – Low
Focused Inspection
↓
Investigate the suspected leakage point.
In simple terms:
High → Find
Medium → Narrow
Low → Pinpoint
This is one of the most useful ways to understand the TA702A.
Example: Checking a Factory Gas Line
Imagine a maintenance technician receives a complaint of a possible combustible gas leak near a production machine.
The installation contains:
Main Pipe → Regulator → Valve → Flexible Connection → Machine
Instead of checking randomly, the technician can use a structured approach.
Start with the appropriate sensitivity while screening the relevant area.
If the response becomes stronger near the valve and flexible connection, focus the inspection there.
Then adjust sensitivity as appropriate while moving the probe around individual connections.
This can make troubleshooting more systematic.
Example: Commercial Kitchen LPG Inspection
The same principle can apply to an appropriate commercial kitchen maintenance inspection.
Possible inspection points include:
Regulator → Pipe → Valve → Hose → Cooking Appliance
If a detector responds around the appliance, do not immediately assume the appliance itself is leaking.
Inspect individual connection points systematically.
Sensitivity adjustment can help narrow the suspected area.
Why Not Keep the Detector on High All the Time?
This is a common question.
Maximum sensitivity is not always the most useful setting for leak locating.
Imagine trying to find one specific leak while the detector responds throughout the surrounding area.
You know combustible gas or vapour is present, but you still do not know exactly where it originates.
Adjustable sensitivity gives the operator more control over the troubleshooting process.
The objective is not:
“Make the detector alarm as easily as possible.”
The objective is:
“Locate the suspected leak as effectively as possible.”
What If the Detector Alarms Everywhere?
If the detector responds across a broad area, several factors may need to be considered:
Sensitivity may be too high for close-range tracing
Gas may have accumulated in the surrounding area
Airflow may be moving gas away from the source
Another combustible vapour may be present
The actual leak may be located elsewhere nearby
Follow the applicable safety procedure.
Do not continue routine troubleshooting in an environment that may be unsafe.
Why Probe Position Matters
Sensitivity adjustment works best when combined with careful probe positioning.
The TA702A uses a flexible extension probe, allowing technicians to inspect areas such as:
Pipe joints
Valve connections
Regulators
Fittings
Flexible hoses
Rear equipment connections
Narrow spaces
Move systematically from one inspection point to another instead of waving the detector randomly through the surrounding air.
TA702A vs TA702B – Different Ways to Help the Technician
The TA702A emphasizes adjustable sensitivity:
High / Medium / Low
This is particularly useful for practical leak tracing.
The TA702B provides additional information such as ppm / LEL indication, ambient temperature and concentration trend information.
Therefore, the choice depends on the operator's requirement.
If your main priority is:
Simple, practical leak locating
TA702A is worth considering.
If you want:
More displayed concentration information during inspection
TA702B may be more suitable.
Applications for TA702A in Malaysia
The adjustable sensitivity function can be useful for maintenance work involving:
Factory gas piping
Industrial machinery
Commercial kitchens
Restaurants
Hotels
Facility management
Building maintenance
Gas valves and regulators
Equipment connections
Maintenance contractors
Instrument suitability should always be confirmed for the actual gas, environment and safety procedure.
High, Medium or Low – Which Setting Should You Start With?
There is no single setting that should be applied blindly to every situation.
Follow the manufacturer's operating instructions and the applicable safety procedure.
For leak-tracing logic, however, the three levels can be understood simply as:
High = Search
Medium = Narrow
Low = Focus
That is the real value of adjustable sensitivity on the TASI TA702A Combustible Gas Detector.
Looking for TASI TA702A in Malaysia?
MTM Precision supplies portable test and measurement instruments for industrial maintenance, factory troubleshooting, facility management and gas leak inspection.
If you are comparing TA702A and TA702B, tell us:
What gas are you checking?
Where will you use the detector?
Do you mainly need leak locating or concentration indication?
We can help compare the models according to the application.
MTM Precision Sdn Bhd
Showroom & Service Centre
No 29-1 & 2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor.
Tel: 03-8080 7172
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
Website: www.mtmpre.com.my
Serving customers throughout Malaysia including Selangor, Kuala Lumpur, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kelantan, Terengganu, Kedah, Perlis, Sabah and Sarawak.
27 Sep 2026
