Operations Guide · 10 min read
Fogging Machine Operator's Guide
A complete step-by-step operational guide for thermal pulse-jet fogging machine operators — from pre-operation safety checks to correct start-up, fogging technique, shutdown, and post-operation maintenance. Suitable for new and experienced operators.
Before Every Operation — Non-Negotiables
- • Full PPE on before handling chemicals or starting the machine
- • Never add chemical to a cold machine — always warm up on carrier oil first (2–3 min)
- • Check fuel, chemical tank, all hose connections, and nozzle before starting
- • Inform residents/bystanders in the area before beginning fogging
- • Never operate in a closed, unventilated space without exhaust management
Phase 1 — Pre-Operation Checks
PPE check
Confirm all PPE is available and correctly fitted: half-face respirator with OV/P100 cartridges, nitrile gloves (elbow length), chemical-resistant coveralls, safety goggles, and closed-toe footwear. Do not begin operation without full PPE.
Fuel check
Check the fuel tank level. Fuel type depends on your model — most 100X Circle thermal foggers run on petroleum (kerosene or petrol mix as specified in your model manual). Never use diesel. Top up if below one-quarter level to avoid running dry mid-operation.
Chemical tank
Verify the chemical-oil mixture is correctly prepared and at the right concentration. Check that the chemical valve is closed before starting the machine. Inspect the chemical line and connection for leaks or cracks.
Machine exterior
Inspect the exhaust tube and muffler for physical damage, cracks, or blockage. Check the shoulder straps/carry handle for integrity. Ensure the jet nozzle is clear — use a nozzle reamer if in doubt. Wipe down the machine if chemical residue is present from previous use.
Area assessment
Walk the area to be fogged. Identify obstacles, confined spaces, open water bodies, beehives, and wind direction. Post advance notice to residents (required by most municipal guidelines). Note wind speed — if above 10 km/h, fog dispersal will be significantly reduced.
Phase 2 — Starting the Machine
Position the machine
Hold the machine level or at the slight upward angle specified in your model manual. For shoulder/backpack models, secure all straps before attempting to start. Point the nozzle away from yourself and bystanders.
Check chemical valve is closed
Confirm the chemical valve (usually a thumb lever or rotary knob near the chemical line) is fully closed. The machine must warm up on pure carrier oil before chemical is introduced.
Start the engine
For electric start models: hold the ignition trigger for 3–5 seconds until the pulse-jet ignites. For pull-start models: prime the fuel pump (3–5 strokes), open fuel valve, pull starter cord firmly. The machine will produce visible smoke/fog on clean oil initially. This is normal.
Warm-up period (2–3 minutes)
Allow the machine to run on pure carrier oil for at least 2 minutes. The exhaust tube must reach operating temperature (300–400°C internally) before chemical is added — this ensures correct vaporisation and white fog output. If the machine is producing dark or inconsistent fog after 3 minutes, investigate before adding chemical.
Open chemical valve gradually
Once fog is white and consistent, slowly open the chemical valve. Start at one-quarter open for 30 seconds, then increase to operating position. This prevents sudden dilution of the hot oil with cold chemical. The fog output may briefly change colour — this is normal. Within 30 seconds, fog should stabilise to the correct output.
Phase 3 — Fogging Operation
Walking speed
3–5 km/h for handheld/shoulder foggers for effective coverage. Moving too fast leaves gaps; moving too slow wastes chemical without additional benefit. For vehicle-mounted: 8–15 km/h.
Nozzle direction
Point nozzle slightly upward (10–15°) and sweep from side to side. For dengue (Aedes): direct fog into vegetation edges and drains. For malaria (Anopheles) evening operations: direct fog into building openings, vegetation, and along drainage channels.
Coverage pattern
Walk in a grid or back-and-forth pattern to avoid gaps and overlaps. For municipal operations: 25–30 metre parallel passes. For narrow lanes: walk down the centre, fog width covers both sides naturally.
Wind awareness
Always move with the fog cloud in front of you or to the side — never walk through your own fog cloud. Position yourself upwind of the fogging area. In cross-wind, adjust walking angle so the fog drifts over target areas.
Re-entry interval
Treated area should not be re-entered for 30–60 minutes after fogging. Post brief warnings in residential areas. For indoor fogging: windows closed during application; re-enter after 30 minutes with ventilation.
Chemical consumption
Monitor chemical tank level. When approximately one-quarter remains, plan to complete the current run before refilling. Do not run the chemical line dry — air in the system requires re-priming.
Phase 4 — Shutdown Procedure
Close the chemical valve
When you have completed the operation or are stopping for a break, close the chemical valve fully. This is the first step — always stop chemical flow before stopping the machine.
Purge with carrier oil (2 minutes)
With the chemical valve closed, allow the machine to run on pure carrier oil for 2 minutes. This purges chemical residue from the vaporiser tube and chemical line — preventing build-up, blockage, and corrosion during storage. This step is non-optional.
Stop the machine
Close the fuel valve or release the ignition trigger (model-dependent). Allow the machine to come to a natural stop — do not attempt to cool it by adding water or placing it in water.
Cool down period
Allow the machine to cool for 15–20 minutes before handling, refilling, or storing. The exhaust tube reaches 300–600°C during operation and retains heat for several minutes after stopping. Do not place the machine on flammable surfaces during cooling.
Drain and store chemical
Remove and drain the chemical tank. Surplus mixed solution should be stored in a sealed, labelled container. Do not leave mixed chemical in the fogger tank between sessions — oil-based insecticide can degrade rubber seals over time and reduce machine life.
Troubleshooting — Common Problems
| Problem | Likely Cause | Solution |
|---|---|---|
| Machine won't start | Low fuel, blocked jet nozzle, wet igniter | Check fuel level; clean jet nozzle with reamer; dry igniter; check fuel valve is open |
| Black or dark smoke | Wrong fuel (diesel), blocked nozzle, machine too cold | Use correct fuel type; clean nozzle; allow longer warm-up on carrier oil |
| No fog / thin fog output | Chemical valve closed, empty chemical tank, kinked chemical line | Open chemical valve; check tank level; inspect chemical line for kinks or blockage |
| Machine vibrates excessively | Loose muffler, damaged resonance cone, worn pulsejet tube | Check and tighten muffler; inspect tube for cracks; contact service centre |
| Chemical dripping from nozzle | Chemical valve leaking, pressure issues in chemical line | Close valve, inspect valve seat for debris; clean with carrier oil flush |
| Fog smells different than usual | Chemical change, contaminated carrier oil, wrong oil type | Check chemical batch; verify carrier oil is mineral oil/paraffin, not diesel |
| Machine stops mid-operation | Fuel exhausted, fuel line blockage, igniter failure | Check fuel; bleed fuel line; allow 5-minute rest and restart attempt |
Post-Operation Record-Keeping
Maintain an operations log for every fogging session. This is required for GeM procurement audits, NVBDCP reporting, Insecticides Act compliance for commercial operators, and internal performance tracking.
Minimum log fields per session:
• Date and time (start/end)
• Area covered (ward name, street, coordinates if available)
• Area in hectares / km²
• Chemical name and batch number
• Chemical concentration (% AI in final solution)
• Volume of chemical used (litres)
• Carrier oil type and volume
• Machine model and serial number
• Operator name and licence number
• Weather conditions (temperature, wind speed, humidity)
• Observations (fog quality, coverage gaps, resident responses)
• Supervisor sign-off
Frequently Asked Questions
How do I start a thermal fogger?
Check fuel and chemical levels, put PPE on, start on pure carrier oil with chemical valve closed, warm up 2–3 minutes, then gradually open chemical valve. Never add chemical to a cold machine.
How long can a fogger run continuously?
Most models support 2–6 hours per session. Allow 10–15 minutes rest between tanks. Inspect the machine on each tank change.
Why is my fogger producing black smoke?
Black smoke indicates wrong fuel type (diesel vs kerosene/petrol), blocked nozzle, or insufficient warm-up. Check fuel type first, then clean the jet nozzle.
How do I clean the fogger after use?
Close chemical valve; flush with carrier oil for 2 minutes while running; stop and cool; drain chemical tank; clean muffler weekly with wire brush; store dry.
What PPE is required for fogger operators?
Half-face respirator (OV/P100 cartridges), nitrile elbow gloves, full-body coveralls, safety goggles, and closed-toe footwear. No shortcuts.
Related Resources
Operator Training Available
100X Circle provides hands-on operator training for municipal and government teams at our facility or on-site. Training covers safe operation, chemical handling, maintenance, and record-keeping.