User guide

Application Guide | Gas detection in refrigeration systems

Commonly used

abbreviations

• LFL = Lower Flammability Level

• OEL = Occupational Exposure Limits

• ATEL = Acute-Toxicity Exposure Limit

• ODL = Oxygen Deprivation Limit

• OSH = Occupational Safety Limit

• ODP = Ozone Depletion Potential

• GWP = Global Warming Potential

• TRK = Technische Richtkonzentrationen

• MAK = Maximale Arbeitsplatzkonzentrationen

• TLV = Threshold Limit Value

• STEL = Short Term Exposure Limit

• PEL = Permissible Exposure Limits

Contents Page

Commonly used abbreviations......................................................................3

Introduction........................................................................................4

Sensor technology..................................................................................4

EC - Electrochemical sensor .....................................................................4

SC - Semiconductor sensor (solid state)..........................................................5

P- Pellistor sensor...............................................................................6

IR - Infrared.....................................................................................6

Which sensor is suitable to a given refrigerant? ..................................................6

Sensor response time ...............................................................................7

The need for gas detection..........................................................................8

Legislation and standards ...........................................................................8

Requirements for gas detection according to EN 378:2016 and ISO 5149:2014 ....................9

F-Gas legislation.............................................................................. 10

Requirements for gas detection according to ASHRAE 15-2016 (USA)........................... 10

Requirements for gas detection according to ANSI/IIAR-2 (USA) ................................ 10

Installation guideline ............................................................................. 11

Location of gas detectors ......................................................................... 12

Number of gas detectors in a facility............................................................... 13

Calibration / test.................................................................................. 13

Calibration methods .............................................................................. 14

Method I Calibration by means of replacing sensor heads...................................... 14

Method II Calibration of gas detectors by means of calibration gas .............................14

Bump test .................................................................................... 15

Alarm / sensitivity range gas detectors ........................................................ 16

Danfoss recommendations for alarm levels .................................................... 16

Actions triggered by gas detection ............................................................... 18

References .......................................................................................19

Annex I - Common refrigerant data................................................................ 20

Annex II - EN 378:2016 and ISO 5149:2014 ......................................................... 20

Annex III - ASHRAE 15-2016 ....................................................................... 21