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Guide

How to Choose a Refrigerant Leak Detector

Refrigerant leak detectors differ mainly in sensor technology, and the right one depends on which refrigerants you meet and how often you use it. This guide gives the decision, the specifications that matter, and the standards to look for.

By the Akermin Editorial Team · 3 min read

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Choose a refrigerant leak detector by sensor: infrared for daily HVAC and refrigeration work, for A2L blends such as R-32 and R-454B, and for anyone tired of false alarms and short sensor life; heated diode for occasional HFC work where price matters and the sensor is treated as a consumable; a semiconductor combustible sniffer for hydrocarbon refrigerants (R-290, R-600a); infrared CO₂ for R-744 systems. Require a stated sensitivity of 3 g/yr or better, compliance with EN 14624 or SAE J2791/J2913 where relevant, a flexible probe with a replaceable tip filter, and an intrinsic safety rating for flammable refrigerants.

Decision by refrigerant and workload

Situation Sensor Examples
Daily HVAC and refrigeration, mixed HFC/HFO/A2L Infrared Inficon D-TEK 3, Fieldpiece infrared, Bacharach
Occasional HFC (R-134a, R-410A) work Heated diode Fieldpiece DR58, Elitech heated diode
A2L systems (R-32, R-454B, R-1234yf) Infrared rated for A2L; intrinsically safe where required A2L-rated infrared units
Hydrocarbon refrigerants (R-290, R-600a) Semiconductor combustible sniffer Combination refrigerant and combustible detectors; see combustible gas leak detectors
CO₂ (R-744) systems Infrared CO₂ specific Dedicated CO₂ leak detectors
Large leaks in noisy plant rooms Ultrasonic as a first pass Ultrasonic leak detectors

See infrared vs heated-diode refrigerant leak detectors for the trade-offs.

Specifications

  • Sensitivity: stated in g/yr; 3 g/yr or better; 1 g/yr on premium infrared.
  • Standards: EN 14624 (stationary), SAE J2791 (HFC automotive), SAE J2913 (HFO automotive).
  • Refrigerants named: the listing should list the families and, for A2L, the specific blends.
  • Sensor life: infrared 5 to 10 years; heated diode 1 to 2 years or a stated hour count; replacement cost.
  • Response and recovery: fast response; quick recovery after a hit so pinpointing is possible.
  • Probe: flexible, 350 to 450 mm, replaceable tip filter to keep oil off the sensor.
  • Indication: tick rate plus bar graph or numeric level; adjustable sensitivity; auto-zero; mute.
  • Power: rechargeable with several hours per charge.
  • Intrinsic safety: required for some flammable refrigerant work; check local rules.

What to avoid

  • Detectors that do not state sensitivity or a standard.
  • Heated-diode units for A2L work unless the maker rates them for it.
  • Using any halogen detector on hydrocarbon refrigerants; it will not see them.
  • Skipping the reference leak check before each job; see how to test a refrigerant leak detector before use.

Using it

Warm up in clean air, kill fans, move the probe slowly along joints with the tip within 5 mm, check below joints because refrigerants are heavier than air, back off and re-approach to pinpoint, and confirm with bubbles. See what a refrigerant leak detector is. Detectors are covered in the gas detection category; the HVAC-wide selection is in how to choose a gas detector for HVAC work.

Inficon D-TEK 3 Refrigerant Leak Detector

Inficon D-TEK 3 Refrigerant Leak Detector

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Fieldpiece - DR58 Heated Diode Refrigerant Leak Detector - Ultra-Sensitive Leak Sniffer with Large, Backlite LCD Screen - Lightweight HVAC Tool

Fieldpiece - DR58 Heated Diode Refrigerant Leak Detector - Ultra-Sensitive

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Elitech HVAC Refrigerant Leak Detector Heated Diode Sensor Halogen Freon Sniffer, Air Conditioning Detection, R22 R410A R134A R1234YF CFCs HCFCs HFCs, ILD-100H

Elitech HVAC Refrigerant Leak Detector Heated Diode Sensor Halogen Freon

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SENSYX HVAC Refrigerant and Combustible Gas Leak Detector, Rechargeable

SENSYX HVAC Refrigerant and Combustible Gas Leak Detector, Rechargeable

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Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.

Frequently Asked Questions

Which refrigerant leak detector is best for R-32 and R-454B?

An infrared detector rated for A2L refrigerants, ideally intrinsically safe. Older heated-diode units may not detect these blends reliably; check the listing names them.

What sensitivity do I need?

3 g/yr meets the common professional benchmark and standards such as EN 14624. Premium infrared detectors reach 1 g/yr or better for finding the smallest leaks.

Can one detector do refrigerants and combustible gases?

Combination units with a semiconductor sensor detect halogenated refrigerants and hydrocarbons, at the cost of selectivity. For frequent refrigerant work, a dedicated infrared unit plus a separate combustible sniffer is more reliable.

Affiliate disclosure: Akermin earns a commission from qualifying Amazon purchases made through links on this page. Our editorial picks are based on documented specifications and owner feedback, not commissions.