BR323AL and BR323SS Flameproof Loop powered field mounting indicators Issue: 14 Issue: 14 21st October 2022
CONTENTS 1. Description 2. Controls 3. Flameproof Certification 3.1 ATEX certificate 3.2 Flammable gases 3.3 Combustible dusts 3.4 Certification label information 4. System Design for use in Hazardous Areas. 5. Installation 5.1 Location 5.2 Installation procedure 5.3 EMC 6. Programming and Calibration 6.1 Loading BEKA software onto a PC 6.2 Connecting BR323 to PC 6.3 Calibration screen 6.4 Linear calibration 6.5 Non-linear calibration 6.6 Square root extraction 7. Maintenance 7.
1. DESCRIPTION The BR323AL and BR323SS are flameproof, field mounting, loop powered 5 digit indicators which display the current flowing in a 4/20mA loop in engineering units. The instruments only introduce a 2.3V drop allowing them to be installed into almost any 4/20mA loop. The main application of these loop powered indicators is to display a measured variable or control signal in a hazardous process area.
3. FLAMEPROOF CERTIFICATION CAUTION The BR323 removable electronic assembly, which is common to both models, may only be installed in a hazardous area when mounted within a flameproof BR323AL aluminium or BR323SS stainless steel enclosure. 3.
3.4 Certification label information The certification information label is fitted in a recess on the top outer surface of the flameproof enclosure. It shows details of the ATEX certification, BEKA associates name and location, plus the year of manufacture. 4. SYSTEM DESIGN FOR USE IN HAZARDOUS AREAS BR323AL and BR323SS indicators may be connected in series with any 4/20mA current loop having a maximum supply voltage of 30V dc and a maximum current of less than 110mA.
5. INSTALLATION 5.1 Location The appropriate model BR323AL or BR323SS should be chosen depending on the severity of the environment. The BR323AL is housed in a polyester powder coated aluminium enclosure and the BR323SS in a 316 stainless steel enclosure suitable for marine applications. Both provide IP66 and NEMA Type 4X protection. Recommended installation procedure: a. Remove the flameproof enclosure cover that contains the viewing window by rotating anticlockwise. b.
6. PROGRAMMING & CALIBRATION The BR323AL and BR323SS 4/20mA indicators are configured and calibrated using BEKA configuration software running on a personal computer connected via a temporary serial data link. WARNING The temporary serial data link must NOT be connected to a BR323AL or BR323SS indicator when an explosive atmosphere is present.
Fig 7 BEKA Configuration Programme Screen 6.4 Linear calibration With the indicator connected to the PC as shown in Fig 6 and communication established, proceed as follows: (1) Right hand side tab Click the Input / Output tab which will produce the screen shown in Fig 7. (2) Linearisation Mode Set to Normal for linear calibration (3) Filter Select frequency of local mains supply to obtain the maximum interference rejection.
(7) Display Settings panel Defines the indicator display at zero value and full value input current, which is normally 4 and 20mA. Note: Irrespective of the selected Display Resolution, this panel always shows two digits after the decimal point. (8) Damping Time A damping time between 0 and 30 seconds may be typed into this box. A long damping time will help to provide a steady display from a noisy input current.
(3) Enter the required indicator display Type the required BR323 indicator Zero and Full scale displays into the appropriate panels. Clicking the Upload button will enter these figures and they will appear on the graph. (4) Entering other parameters Clicking the Input / Output tab will enable the Filter, Tag, Display Resolution, Damping Time and Units of Measurement to be entered – see 6.4 steps 3, 4, 5, 6 & 9 and Fig 7.
7. 7.2 MAINTENANCE 7.1 Fault finding during commissioning If a BR323AL or BR323SS fails to function during commissioning the following procedure should be followed: Symptom Cause Solution No display Incorrect wiring There should be 2.3V between the +ve & -ve terminals. No display and no volts between +ve & -ve terminals. Incorrect wiring or no power supply. Check that a current is flowing in the loop.
7.5 Guarantee Indicators which fail within the guarantee period should be returned to BEKA associates or our local agent. It is helpful if a brief description of the fault symptoms is provided. 7.6 Customer comments BEKA associates is always pleased to receive comments from customers about our products and services. All communications are acknowledged and whenever possible, suggestions are implemented. 8. ACCESSORIES 8.
