GOAL 0 HARM DELIVERED.

They measure different risks. PPM (parts per million) tracks toxic exposure — gases like H2S or CO that harm people at trace concentrations, far below anything flammable. %LEL (Lower Explosive Limit) tracks fire and explosion risk — how close a flammable gas is to the minimum concentration that can ignite. A reading of 10% LEL means the atmosphere is at one-tenth of its ignition threshold. Most hazardous plants need both: PPM to protect lungs, LEL to protect the plant.

Bump-test before each day's use: a short exposure to known gas confirming the sensors respond and alarms fire. Full calibration — adjusting sensor output against certified span gas — is typically monthly to six-monthly depending on manufacturer specification, gas type and site policy. A detector that passes its bump test is safe to use; one that drifts on calibration is telling you its sensor is ageing. We schedule and document both.

Fixed detection guards locations: known leak sources, congested process areas, enclosed spaces — running 24/7 and wired to plant alarms. Portables guard people: whoever enters a hazard zone carries their own measurement. The design question is a coverage study — release scenarios, gas density, air movement, occupancy — not a catalogue choice. That study is exactly what our site audit produces.

Zones describe how often an explosive atmosphere is present: Zone 0 (continuously), Zone 1 (likely in normal operation), Zone 2 (abnormal conditions only). Every electrical device placed in a zone must be certified for it — an uncertified instrument is itself an ignition source. ATEX (EU) and IECEx (international) are the certification schemes; Indian sites typically require PESO approval alongside. We only specify equipment certified for the zone it will live in.

Electrochemical cells are consumables — typically two to three years, less in hot or dry service, and they fail gradually rather than loudly. iNet Exchange removes the problem: when a unit is due for calibration or a sensor approaches end-of-life, a freshly calibrated replacement arrives before you ship the old one back. Your team never services a detector and never works a shift without one. Zero calibration downtime, by design.

Yes. Fixed systems talk to plant control via standard industrial signals — 4–20 mA, HART, Modbus — so readings and alarm relays land in your DCS like any other instrument. Connected portables and wearables report over the monitoring platform, which exposes data for historian and dashboard integration. You keep one operational picture; we make sure gas data is in it.

An unconnected detector alarms to whoever is standing beside it. A connected one alarms the control room, the safety officer's screen and the response protocol at the same instant — with location, gas type and concentration attached. Man-down and lone-worker events escalate automatically. The gap between “a detector went off somewhere” and “we know who, where and what” is measured in minutes, and in this industry minutes are the whole game.

A structured survey of your hazard sources, zone classifications, existing coverage and calibration records — delivered as a documented gap assessment with a prioritised recommendation, not a sales quote. It typically takes one to three days on site depending on plant size. Request one below; we respond within 24 hours.