BEKA BA304SG Loop Powered Indicators Instruction Manual
- June 9, 2024
- BEKA
Table of Contents
BEKA BA304SG Loop Powered Indicators
DESCRIPTION
The BA304SG and BA324SG are field mounting, increased safety Ex eb loop powered 4/20mA digital indicators. They are a lower cost alternative to a flameproof Ex d indicator featuring a large, easy to read display. The two models are mechanically and electrically identical, but have different size displays. A loop powered display backlight is available as a factory fitted option.
- BA304SG 4 digits 34mm high
- BA324SG 5 digits 29mm high + 31 segment bargraph
This abbreviated instruction sheet is intended to assist with installation and commissioning, a comprehensive instruction manual describing safety certification, system design and calibration may be downloaded from www.beka.co.uk or requested from the BEKA sales office. An application guide AG320 is also available. Both models have IECEx, ATEX and UKEX certification and may be installed exactly as an Ex d flameproof indicator in Zones 1 or 2 without the need for a Zener barrier or galvanic isolator. The indicators may be safely connected in series with any 4/20mA hazardous area loop with a supply up to 30V dc, employing any type of certified explosion protection including, flameproof Ex d, pressurised Ex p, encapsulated Ex m or increased safety Ex e. The BA304SG and BA324SG should not be used with intrinsically safe Ex i equipment. The BA304SG and BA324SG may also be used as an alternative to a certified Ex nA indicator in Zone 2. Both indicators have dust ignition protection by enclosure Ex tb that allows them to be installed in Zones 21 and 22.
INSTALLATION
The BA304SG and BA324SG have a robust glass reinforced polyester (GRP) carbon loaded enclosure which provides IP66 ingress and 7J impact protection. They are suitable for exterior surface mounting in most industrial environments, or may be pipe or panel mounted using an accessory kit. Both back-box cable entries have M20 x 1.5 threads with an Ex e and Ex t certified stopping plug fitted in the right hand entry. The left hand entry has a temporary plug to prevent the ingress of dust and dirt during transportation and should be replaced with a certified Ex e and Ex t cable gland or conduit entry. To prevent the build up of an electrostatic charge the indicator enclosure is slightly electrically conductive. If the indicator enclosure is not mounted on a metal structure that provides a discharge path, it should be earthed using the instrument’s internal earth terminal.
Step A
Unscrew the four captive ‘A’ screws, lift off the indicator assembly and un-
plug the wires from the back-box as shown in fig 2.
Step B
Secure the enclosure back-box to a flat surface with M6 screws through the
four ‘B’ holes. Alternatively use a pipe on panel mounting kit.
Step C
Remove the temporary hole plug and install an Ex e cable gland or conduit
fitting. Feed the field wiring through the cable entry and connect to
terminals in back-box.
Step E
Plug the indicator assembly wires into the back-box connector. Check sealing
gasket before replacing the indicator assembly and securing by evenly
tightening the four ‘A’ screws.
Abbreviated Instruction for BA304SG & BA324SG Ex eb and Ex tb field mounting loop powered indicators
EMC
For specified immunity all wiring should be in screened twisted pairs, with
the screens earthed in the safe area.
Scale card
The indicator’s units of measurement and tag information are shown above the display on a slide-in scale card. New instruments are fitted with a scale card showing the information requested when the instrument was ordered, if this is not provided a blank scale card will be fitted which can easily be marked on- site. Custom printed scale cards are available from BEKA associates. To remove the scale card, carefully pull the tab perpendicularly away from the rear of the indicator assembly. See Fig 4 for the location of the scale card tab.To replace the scale card carefully insert it into the slot on the right hand side of the indicator assembly which is shown in Fig 4. Force should be applied evenly to both sides of the scale card to prevent it twisting. The card should be inserted until about 2mm of the transparent tab remains protruding.
OPERATION
Both models are controlled and calibrated via four front panel push buttons. In the display mode i.e. when the indicator is displaying a process variable, these push buttons have the following functions:
While this button is pushed the indicator will display the input current in mA, or as a percentage of the instrument span depending upon how the indicator has been configured. When the button is released the normal display in engineering units will return.
While this button is pushed the indicator will display the numerical value and analogue bargraph¹ the indicator has been calibrated to display with a 4mA² input. When released the normal display in engineering units will return.
While this button is pushed the indicator will display the numerical value and analogue bargraph¹ the indicator has been calibrated to display with a 20mA² input. When released the normal display in engineering units will return.
No function in the display mode unless the tare function is being used.
Indicator displays firmware number followed by version.
Provides access to the configuration menu via optional security code.
Note
- Only BA324SG has bargraph
- If the indicator has been calibrated using the CAL function, calibration points may not be 4 and 20mA.
CONFIGURATION
CONFIGURATIONIndicators are supplied calibrated as requested when ordered, if not specified default configuration will be supplied but can easily be changed on-site.Fig 5 shows the location of each function within the configuration menu with a brief summary of the function. Please refer to the full instruction manual for detailed configuration information and for a description of the lineariser.Access to the configuration menu is obtained by pressing the ( and ) buttons simultaneously. If the indicator security code is set to the default 0000 the first parameter FunC will be displayed. If the indicator is protected by a security code, CodE will be displayed and the code must be entered to obtain access to the menu.
Manuals, certificates and data-sheets can be downloaded from http://www.beka.co.uk/ex-eb
The BA304SG and BA324SG are CE marked to show compliance with the European Explosive Atmospheres Directive 2014/34/EU and the European EMC Directive 2014/30/EU. They are also UKCA marked to show compliance with UK statutory requirements Equipment and Protective Systems Intended for Use in Potentially Explosive Atmospheres Regulations UKSI 2016:1107 (as amended) and with the Electromagnetic Compatibility Regulations UKSI 2016:1091 (as amended).