Testo 340 - Multigas Combustion Engine Tuning Analyzer

Area Monitoring Datalogging
Emissions Manufacturer: Testo
Testo 340 - Multigas Combustion Engine Tuning Analyzer
Testo 340 - Multigas Combustion Engine Tuning Analyzer
Testo 340 - Multigas Combustion Engine Tuning Analyzer

The Testo 340 by Testo is a portable, handheld flue gas analyzer designed for combustion tuning and maintenance of engines, boilers, furnaces, and process heating equipment. It measures up to four gases simultaneously — O₂ (0–25% vol.), CO (0–10,000 ppm), NO (0–3,000 ppm), and NO₂ (0–5,000 ppm) — with automatic combustion efficiency and excess air calculations displayed in real time. On-board data storage and an integrated printer enable immediate on-site documentation, making it well-suited for mechanical engineers and facility maintenance teams performing routine combustion tuning and preventative maintenance on commercial heating equipment.

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$225.00
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$645.00
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Expert support available by phone and email
Fast delivery and flexible rental terms

Frequently Asked Questions

It's a portable multi-gas combustion analyzer for tuning and troubleshooting boilers, furnaces, and engines. It measures up to four gases simultaneously — O₂, CO, NO, NO₂, and SO₂ — and automatically calculates combustion efficiency and excess air, giving you the numbers needed to adjust air-to-fuel ratio and document performance.

Use the Testo 340 for routine combustion tuning, efficiency testing, and basic emissions measurements when up to four gases is sufficient. Use the Testo 350 when your test plan requires more gases (including hydrocarbons), compliance-grade documentation, or formal regulatory reporting. For everyday boiler and furnace work, the 340 covers most use cases.

O₂ 0–25% vol, CO 0–10,000 ppm (low range: 0–500 ppm), NO 0–3,000 ppm (low range: 0–300 ppm), NO₂ 0–5,000 ppm, SO₂ 0–5,000 ppm. Confirm which sensors are installed for your rental if your application requires a specific gas or low-range resolution.

Excess air is the air supplied beyond what combustion chemically requires. Too much reduces efficiency; too little increases CO and combustion byproducts. The Testo 340 reports excess air alongside efficiency calculations so you can tune toward the right balance — always within equipment manufacturer guidelines and site safety requirements.

Insert the sampling probe into a stable, representative flue gas stream. Let readings fully stabilize before recording — don't capture numbers while the display is still settling. Keep probe placement consistent when comparing before/after adjustments. Check for condensation or particulate loading in the sampling path if readings seem erratic.

Yes. Datalogging creates a time-stamped record across tuning sessions or multiple assets. Confirm your reporting format — exported logs, printed tickets, or manual transcription — before you start fieldwork so you're not re-running tests to meet documentation requirements.

The kit includes the Testo 340 analyzer with up to four gas sensors, flue gas sampling probe with thermocouple, integrated printer with paper, rechargeable battery, AC charger, protective carrying case, calibration certificates, and instruction manual. Confirm sensor configuration before dispatch if your work requires a specific gas.

$225/day and $645/week. Pricing beyond two weeks is by quote. For boiler or furnace tuning campaigns, total cost is driven by the number of assets and test points — the day rate is fixed, but multi-asset projects benefit from a weekly or quoted rate.

Exposure Hazards This Equipment Detects

Oxygen (O₂)

CAS: 7782-44-7
Learn More
Updated on March 09, 2026
PEL TWA
N/A
REL TWA
N/A
TLV TWA
N/A

Nitrogen Dioxide (NO₂)

CAS: 10102-44-0
Learn More
Updated on March 17, 2026
PEL TWA
N/A
REL TWA
N/A
TLV TWA
0.2 ppm (0.38 mg/m³)

Carbon Monoxide (CO)

CAS: 630-08-0
Learn More
Updated on March 17, 2026
PEL TWA
50 ppm (55 mg/m³)
REL TWA
35 ppm (40 mg/m³)
TLV TWA
N/A

Nitric Oxide (NO)

CAS: 10102-43-9
Learn More
Updated on March 09, 2026
PEL TWA
25 ppm (30 mg/m³)
REL TWA
25 ppm (30 mg/m³)
TLV TWA
25 ppm [1992]

Features & Capabilities

Datalogging: ✓ Yes
Monitoring Scope: Area Monitoring

Equipment Specifications

GasRangeResolutionAccuracyResponse TimeO₂0–25% vol0.01%±0.2%<20 secondsCO0–10,000 ppm1 ppm±10 ppm or ±10%<40 secondsCO (Low Range)*0–500 ppm0.1 ppm±5 ppm or ±5%<40 secondsNO0–3,000 ppm1 ppm±5 ppm or ±5%<30 secondsNO (Low Range)*0–300 ppm1 ppm±2 ppm or ±5%<30 secondsNO₂0–5,000 ppm0.1 ppm±5 ppm or ±5%<40 secondsSO₂0–5,000 ppm1 ppm±10 ppm or ±10%<40 secondsCalculated parameters

Combustion efficiency (η):

  • Calculation method: Heat loss method per DIN EN 50379
  • Range: 0–120%
  • Display resolution: 0.1%

Excess air (λ):

  • Range: 1.00–9.99
  • Resolution: 0.01

CO₂ calculation:

  • Derived from O₂ measurement
  • Range: 0–CO₂ max
  • Fuel types: 30+ fuel profiles (natural gas, propane, oil, coal, wood, etc.)

Memory and data logging:

  • Storage capacity:100 test locations with 10 measurement tests per location (1,000 total measurements)
  • Data logging intervals:Configurable from 1 second to 60 seconds per measurement
  • Storage modes:Manual trigger or continuous automatic logging
  • Data fields stored:All measured gases, temperatures, calculated values, date/time stamp, location ID

Power and battery performance:

  • Battery type:Rechargeable lithium-ion battery pack
  • Runtime at +20°C:8 hours continuous operation with all sensors active
  • Runtime variables:Battery life reduced at cold temperatures, with heavy printer usage, or with Bluetooth active
  • Charging time:4 hours for full charge from empty
  • Low battery warning:On-screen indicator alerts user before shutdown

Environmental:

  • Operating temperature: -5 to +45°C
  • Storage temperature: -20 to +50°C
  • Protection class: IP40

Kit Contents

Testo 340 analyzer with up to 4 gas sensors, flue gas sampling probe with thermocouple, integrated printer with paper, rechargeable battery, AC charger, protective carrying case, calibration certificates, instruction manual, and technical support.

Manufacturer Resources

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