AD_GA24_II2G_R03_en_4000836702_PRT.
AD_GA24_II2G_R03_en_4000836702_PRT.book Page 2 Wednesday, June 26, 2013 2:30 PM CONTENTS GA24 1 Safety instructions 3 1.1 General notes ................................................................................................................... 3 1.2 EC conformity ................................................................................................................... 3 1.3 Security information ............................................................................................
Safety instructions AD_GA24_II2G_R03_en_4000836702_PRT.book Page 3 Wednesday, June 26, 2013 2:30 PM SAFETY INSTRUCTIONS 1 GA24 1.1 General notes These additional instructions apply to explosion-protected versions of variable area flowmeters with electrical built-ins and the marking II 2 G. They complete the installation and operation instructions for the non-explosion protected versions. The information given in these instructions contains only the data relevant to category 2 explosion protection.
Device description AD_GA24_II2G_R03_en_4000836702_PRT.book Page 4 Wednesday, June 26, 2013 2:30 PM 2 DEVICE DESCRIPTION GA24 2.1 Device description Variable area flowmeters measure the volume flow of flammable and non-flammable gases and liquids. Up to two separately adjustable electrical limit switches can be mounted to the on-site display. 2.
AD_GA24_II2G_R03_en_4000836702_PRT.book Page 5 Wednesday, June 26, 2013 2:30 PM DEVICE DESCRIPTION 2 GA24 2.3 Marking Type designation of the complete unit is shown on the indicator with the nameplates reproduced below. Nameplate GA24 1 Device type 2 Manufacturer 3 Manufacturer's website 4 Note manual 5 Ex data 6 Serial No.
AD_GA24_II2G_R03_en_4000836702_PRT.
AD_GA24_II2G_R03_en_4000836702_PRT.book Page 7 Wednesday, June 26, 2013 2:30 PM DEVICE DESCRIPTION 2 GA24 2.4 Flammable products Atmospheric conditions An explosive atmosphere is a mixture of air and flammable gases, vapours, mists or dusts under atmospheric conditions. The following values define it Tatm = -20°C...+60°C / -4°F...140°F and Patm = 0.8...1.1bar. Outside of this range, no key data are available as to ignition behaviour for most mixtures.
AD_GA24_II2G_R03_en_4000836702_PRT.book Page 8 Wednesday, June 26, 2013 2:30 PM 2 DEVICE DESCRIPTION GA24 2.7 Ambient temperature / temperature classes Because of the influence of the temperature of the product, no fixed temperature class is assigned to variable area flowmeters with attached electrical equipment. In fact, the temperature class of a device is a function of the temperature of both the product and the environment. There is no distinction between devices with one or two contacts.
Installation AD_GA24_II2G_R03_en_4000836702_PRT.book Page 9 Wednesday, June 26, 2013 2:30 PM INSTALLATION 3 GA24 3.1 Installation Installation and setup must be carried out according to the applicable installation installation standards (e.g. EN 60079-14) by qualified personnel trained in explosion protection. The information given in the Installation and Operation Instructions and the Supplementary Installation and Operation Instructions must always be observed.
Electrical connections AD_GA24_II2G_R03_en_4000836702_PRT.book Page 10 Wednesday, June 26, 2013 2:30 PM 4 ELECTRICAL CONNECTIONS GA24 4.1 General notes The electrical connection of the limit switch with protection level "ia" or "ib" is described in the manual. Permissible maximum values (electrical data) must be observed. Observe the specified polarities. The TG21 limit switch is electrically connected to the connection terminals in the connection box.
Operation AD_GA24_II2G_R03_en_4000836702_PRT.book Page 11 Wednesday, June 26, 2013 2:30 PM OPERATION 5 GA24 5.1 Start-up Make the following checks before starting up the device: • Suitability of the materials used for the measuring unit and for the gaskets for adequate resistance to corrosion from the process product. • Correct connection of the built-on electrical components of the electical option. • Proper fastening of the mounting elements of the limit switches.
Service AD_GA24_II2G_R03_en_4000836702_PRT.book Page 12 Wednesday, June 26, 2013 2:30 PM 6 SERVICE GA24 6.1 Maintenance The measuring device requires no maintenance under normal operating conditions and when used as prescribed. The following visual checks should be carried out at regular intervals in conjunction with the system inspections required in hazardous areas to keep equipment in good operating condition: • Checking the housing, the cable entries and the feed lines for corrosion and/or damage.
Notes AD_GA24_II2G_R03_en_4000836702_PRT.book Page 13 Wednesday, June 26, 2013 2:30 PM NOTES 7 GA24 06/2013 - 4000836702 - MA G24-Ex-II2G-AD R03 en www.krohne.
AD_GA24_II2G_R03_en_4000836702_PRT.book Page 14 Wednesday, June 26, 2013 2:30 PM 7 NOTES 14 GA24 www.krohne.
AD_GA24_II2G_R03_en_4000836702_PRT.book Page 15 Wednesday, June 26, 2013 2:30 PM NOTES 7 GA24 06/2013 - 4000836702 - MA G24-Ex-II2G-AD R03 en www.krohne.
AD_GA24_II2G_R03_en_4000836702_PRT.book Page 16 Wednesday, June 26, 2013 2:30 PM © KROHNE 06/2013 - 4000836702 - MA G24-Ex-II2G-AD R03 en - Subject to change without notice.
