Related Manuals for BEKA BA304NC
Summary of Contents for BEKA BA304NC
- Page 1 BA304NC Type nA Loop-powered 3½ digit field mounting indicator issue 7 Issue: 7 March 2014...
-
Page 2: Table Of Contents
6.1 Zero adjustment 6.2 Span adjustment 6.3 Decimal point 6.4 Reverse action 6.5 Calibration example 6.6 Over and under-range The BA304NC is CE marked to show compliance with the European Explosive Atmospheres Directive 94/9/EC and the European EMC Directive 2004/108/EC... -
Page 3: Description
1. DESCRIPTION The BA304NC is an Ex nA (non sparking) loop powered digital indicator which displays the current flowing in a 4/20mA loop in engineering units. The instrument introduces less than a 1.1V drop which allows it to be installed into almost any 4/20mA current loop. -
Page 4: Input Parameters
3.2 Zones, Gas Groups and T rating The instrument serial number and date of The BA304NC has been certified as Group II, manufacture are shown on a separate label within Category 3G Ex nA nL ia IIC T5 Gc Tamb -40 to the instrument enclosure. -
Page 5: System Design For Zone
4.2 Remote indication The BA304NC may be driven directly from a safe area instrument with a 4/20mA output to provide a remote display within a Zone 2 hazardous area. - Page 6 Comprehensive design and installation information for Ex nA [extra low voltage] instrumentation is contained in the BEKA Application Guide AG310 which may be downloaded from the BEKA website www.beka.co.uk.
-
Page 7: Installation
Replace the indicator assembly and evenly tighten the three 'B' screws. 5.1 Location g. Replace the enclosure cover and evenly The BA304NC indicator can be supplied in either a tighten the four 'A' screws. glass reinforced polyester (GRP), or an epoxy painted aluminium enclosure. -
Page 8: Emc
5.3 EMC The BA304NC complies with the requirements of the European EMC Directive 2004/108/EC. specified immunity all 4/20mA wiring should be in screened twisted pairs, with the screen earthed within the safe area. Terminal 7 should be connected to a local earth or to a cable screen which is earthed in the safe area. -
Page 9: Calibration
6. CALIBRATION 6.2 Span adjustment The BA304NC will be supplied calibrated as Span is defined as the difference between the requested at time of ordering. If calibration is not number displayed with 4.000mA input and the requested, the indicator will be set to display 00.0 number displayed with 20.000mA input. -
Page 10: Calibration Example
If the indicator display range is exceeded, the three least significant digits will be blanked. Under- range is indicated by -1 and over-range by 1. the display range is not exceeded, the BA304NC will produce accurate readings outside the 4/20mA current range. Although not guaranteed, most BA304NC indicators will operate between 3 and 25mA. -
Page 11: Maintenance
Check that a current foreign bodies. with 0V wiring or is flowing in the loop. between no power If a BA304NC fails after it has been functioning terminals 1 supply. correctly, the following procedure should be and 3. followed: Insufficient... -
Page 12: Servicing
BEKA associates or your undamaged and free from dirt and local BEKA agent. It is helpful if a brief description foreign bodies. of the fault symptoms is provided. To simplify servicing, all ATEX certified BA304NC indicators use a common indicator assembly which 7.6 Customer comments... -
Page 13: Accessories
20.00 8.2.1 Calibration example with root extractor 8.2 Root extractor The BA304NC is required to display rate of flow in The BA304NC can be supplied with a square root gallons per minute, with a resolution of 0.1 gallons. extractor which enables the indicator to accurately... -
Page 14: Display Backlight
8.4 Pipe mounting kits span potentiometer until the indicator Two pipe mounting kits are available for securing displays 140.0 the BA304NC to a horizontal or vertical pipe. Step 7 Repeat steps 5 and 6 until both BA392C Stainless steel bracket secured by two calibration points are correct.
Need help?
Do you have a question about the BA304NC and is the answer not in the manual?
Questions and answers