BEKA BA304G & BA324G Intrinsically Safe Digital Indicators

DESCRIPTION

The BA304G, BA304G-SS, BA324G, and BA324G-SS are field-mounting, intrinsically safe digital indicators designed to display the current flowing in a 4/20mA loop in engineering units. They are loop-powered, introducing only a 1.2V drop into the loop. All models are electrically similar but differ in display size and enclosure materials.

• BA304G: 4 digits, 34mm high, GRP enclosure.
• BA304G-SS: 4 digits, 34mm high, 316 stainless steel enclosure.
• BA324G: 5 digits, 29mm high + 31 segment bargraph, GRP enclosure.
• BA324G-SS: 5 digits, 29mm high + 31 segment bargraph, 316 stainless steel enclosure.

This abbreviated instruction sheet assists with installation and commissioning. A comprehensive manual covering safety certification, system design, and calibration is available from BEKA associates or may be downloaded from their website.

All models feature IECEx, ATEX, UKEX, ETL, and CETL intrinsic safety certification for use in flammable gas and combustible dust atmospheres. The certification label on the instrument enclosure displays certificate numbers and codes. Copies of certificates can be downloaded from www.beka.co.uk.

Typical certification information label example:

CE 25750350x
Ex ia IIC T60°C Da IP66, -40°C ≤ Ta ≤ +70°C
Ex iD 20 T60°C ITS21UKEX0087X
ITS11ATEX27253X IECEX ITS11.00
BA304G 4 Digit Indicator
Class I, Div 2 Gp ABCD TS
Class II, Div 2 Gp F, G Class III, Div 2
+60°C
Noricon due per BEKA Dwg 01300 84
BEKA associates Hitchin England www.beka.co.uk
英国制造 (Made in UK)

CAUTION: Special conditions apply for installation in Zone 0. Refer to certificates or the full instruction manual.

INSTALLATION

The BA304G and BA324G feature robust glass-reinforced polyester (GRP) enclosures with carbon loading. The BA304G-SS and BA324G-SS have 316 stainless steel enclosures. Both enclosure types are impact-resistant and provide IP66 ingress protection. They are suitable for exterior surface mounting in most industrial environments or can be panel or pipe mounted using accessory kits.

If the indicator is not bolted to an earthed post or structure, the earth terminal should be connected to local earthed metalwork or the plant's potential equalising conductor. GRP indicators have an earth terminal on the cable entry bonding plate, and stainless steel indicators have it in the bottom left-hand corner of the back-box.

Terminals 8, 9, 10, 11, 12, 13 & 14 are fitted only when the indicator includes optional alarms and a backlight. Refer to the full manual for details.

Installation Procedure:

1. Step A: Unscrew the four captive 'A' screws and separate the indicator assembly from the back-box.
2. Step B: Secure the back-box to a flat surface using M6 screws through the four 'B' holes. Alternatively, use a pipe mounting kit. Four M6 clearance holes are provided for surface mounting.
3. Step C: Two M20 x 1.5 threaded cable entries are provided. One IP66 stopping plug (nylon or stainless steel to match the enclosure) and one temporary hole plug are supplied. Remove the temporary hole plug and install an appropriate IP-rated cable gland or conduit fitting. Feed the field wiring through the cable entry.
4. Step D: Terminate field wiring on the indicator assembly. Replace the indicator assembly onto the enclosure back-box and tighten the four 'A' screws.

Diagram showing installation steps (Fig 1).

Dimensions and Terminal Connections (Fig 2):

The diagram shows dimensions and terminal connections. Key terminals include:

• Terminals 8, 9, 10, 11, 12, 13 & 14: For optional alarms and backlight.
• Terminals 2 & 4: Internally linked for joining the 4/20mA return wire.
• Common terminal.
• 4/20mA input terminals.
• Scale Card slot.

Replacing the Scale Card: Carefully insert the scale card into the slot on the right side of the input terminals (as shown in Fig 4). Apply force evenly to both sides to prevent twisting. Insert until approximately 2mm of the transparent tab remains protruding.

OPERATION

The indicator's units of measurement and tag information are displayed on a slide-in scale card above the display. New instruments are supplied with a scale card showing the requested information. If not specified, a blank scale card is provided, which can 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.

All models are controlled and calibrated via four front panel push buttons. In display mode, these buttons have the following functions:

• P+: While pressed, displays the input current in mA or as a percentage of the instrument span. Returns to normal display upon release. Function modified when optional alarms are fitted.
• P-: While pressed, displays the numerical value and analogue bargraph* calibrated for a 4mA input. Returns to normal display upon release.
• P+: While pressed, displays the numerical value and analogue bargraph* calibrated for a 20mA input. Returns to normal display upon release.
• P-: No function in display mode unless the tare function is used. Displays firmware number followed by version.
• P+F: Provides direct access to alarm setpoints if optional alarms are fitted and the ACSP access setpoints function is enabled.
• P+F: Provides access to the configuration menu via optional security code.

* BA324G & BA324G-SS only.

Note: If the indicator was calibrated using the CAL function, calibration points may not be 4 and 20mA.

Measurement Loop Example (Fig 3):

The diagram illustrates a typical measurement loop including a hazardous area, safe area, 2-wire transmitter, safety barrier, load, and the BEKA indicator. It shows a 4/20mA input and loop power supply.

EMC

For specified immunity, all wiring should be in screened twisted pairs with screens earthed in the safe area.

CONFIGURATION

Indicators are supplied calibrated as requested. Default configuration is supplied if not specified, but can be changed on-site.

Access to the configuration menu is by pressing the P and E buttons simultaneously. If the security code is the default 0000, the first parameter 'Fun' is displayed. If a security code is set, 'Code' is displayed, and the code must be entered to access the menu.

Fig 5 shows the configuration menu structure and function summaries. Refer to the full instruction manual for detailed configuration information, lineariser, and dual alarm descriptions.

Configuration Menu Parameters:

• Function (Fun): Selects the standard function (Std), square root extractor (√), or lineariser (Lin).
• Resolution: Selects the resolution of the least significant digit.
• Decimal point: Selects the position of the decimal point.
• Calibration (CAL): Uses an external current source (preferred) or internal references. Set required zero display with 4mA input using P and E buttons. Set required full-scale display with 20mA input using P and E buttons. Any current between 4 and 20mA can be used, provided the difference is > 4mA.
• Type (Type): Selects bargraph display type and defines start/finish relative to the digital display.
• Bargraph Low (barLo): Sets the digital display value at which the bargraph starts.
• Bargraph High (barHi): Sets the digital display value at which the bargraph finishes.
• Function of P button (P): Toggles between 4-20mA and % of span display mode.
• Tare Function: Turns the tare function on or off.
• Define Security Code (CodE): Enter a security code using P and E buttons. Confirm selection by entering 'Sure' using P and E buttons.
• Reset indicator configuration (Conf): Resets the indicator to default configuration.
• Reset lineariser (LEAb): Resets the lineariser to default configuration.

Compliance: The BA304G, BA304G-SS, BA324G & BA324G-SS are CE marked for the European Explosive Atmospheres Directive 2014/34/EU and the European EMC Directive 2014/30/EU. They are also UKCA marked for UK statutory requirements.

Manuals, certificates, and datasheets can be downloaded from http://www.beka.co.uk/lpi1/.

Product Information

Manufacturer: BEKA associates Ltd.

Address: Old Charlton Rd, Hitchin, Hertfordshire, SG5 2DA, UK

Telephone: +44(0)1462438301

Email: sales@beka.co.uk

Website: www.beka.co.uk

Issue: 7

Date: 24th November 2022