AS/NZS 61779.4:2000

1 - AS/NZS 61779.4:2000 ELECTRICAL APPARATUS FOR THE DETECTION AND MEASUREMENT OF FLAMMABLE GASES - PERFORMANCE REQUIREMENTS FOR...
4 - PREFACE
5 - CONTENTS
7 - 1 Scope
7 - 2 Definitions
7 - 3 General requirements
7 - 4 Performance requirements
7 - 4.1 General
7 - 4.2 Unpowered storage
8 - 4.3 Calibration curve (not applicable to alarm-only apparatus)
8 - 4.3.1 Calibration curve
8 - 4.3.2 Response to gases other than the test gas
8 - 4.4 Stability (continuous duty apparatus)
8 - 4.5 Stability (spot-reading apparatus)
8 - 4.6 Alarm
8 - 4.7 Temperature
9 - 4.8 Pressure
9 - 4.9 Humidity
9 - 4.10 Air velocity
9 - 4.11 Flow rate
9 - 4.12 Orientation
9 - 4.13 Vibration
9 - 4.14 Drop test (applicable to portable apparatus and remote sensors)
9 - 4.15 Warm-up time (not applicable to spot-reading apparatus)
9 - 4.15.1 Fixed and transportable apparatus
10 - 4.15.2 Continuous duty portable apparatus
10 - 4.16 Time of response (not applicable to spot-reading apparatus)
10 - 4.17 Minimum time to operate (spot-reading apparatus)
10 - 4.18 High gas concentration above the measuring range
10 - 4.18.1 Non-ambiguity test
10 - 4.18.2 Residual effect test
10 - 4.19 Battery capacity
10 - 4.19.1 Battery-powered portable continuous duty apparatus
10 - 4.19.2 Battery-powered portable spot-reading apparatus
11 - 4.20 Power supply variations
11 - 4.20.1 General
11 - 4.20.2 AC and external d.c. powered apparatus
11 - 4.20.3 Other power supply ranges
11 - 4.21 Power supply interruptions, voltage transients and step changes of voltage
11 - 4.22 Addition of sampling probe
11 - 4.23 Dust
11 - 4.24 Poisons and other gases
11 - 4.24.1 Poisons
11 - 4.24.2 Other gases
11 - 4.25 Electromagnetic compatibility
11 - 5 Field calibration kit

Specifies requirements for group II (as defined in part 1) portable,transportable and fixed apparatus for the detection and measurement of combustible gas or vapour concentrations with air. The apparatus, or parts thereof, may be installed or used in potentially explosive atmospheres, other than mines sesceptible to firedamp (i.e. group I). This Standard is restricted to apparatus intended for the detection and measurements of combustible gas or vapour concentrations with air up to 100 percent lower explosive limit (LEL).

This part of AS/NZS 61779 specifies requirements for group II (as defined in part 1) portable, transportable and fixed apparatus for the detection and measurement of combustible gas or vapour concentrations with air. The apparatus, or parts thereof, may be installed or used in potentially explosive atmospheres, other than mines susceptible to firedamp (i.e. group I). The requirements and test methods applicable to the apparatus covered by this standard are specified in part 1.This standard is restricted to apparatus intended for the detection and measurement of combustible gas or vapour concentrations with air up to 100% lower explosive limit (LEL).

First published as part of AS 1827-1975.
Revised and redesignated as AS 2275.1-1979.
AS 2275.2 first published 1979.
AS 2275.1-1979 and AS 2275.2-1979 jointly revised, amalgamated and redesignated in part as AS/NZS 61779.4:2000.