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Summary of Contents for BEKA BA304NC nL
- Page 1 BA304NC Type nL Loop-powered 3½ digit field mounting indicator issue 5 Issue: 5 November 2009...
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Page 2: Table Of Contents
CONTENTS 1. Description 7. Maintenance 7.1 Fault finding during commissioning 2. Operation 7.2 Fault finding after commissioning 7.3 Servicing 7.4 Routine maintenance 3. Type ‘nL’ Certification 3.1 ATEX Certificate 7.5 Guarantee 3.2 Zones, gas groups & T rating 7.6 Customer comments 3.3 Input parameters 3.4 Certification label information 8. -
Page 3: Description
1. DESCRIPTION The BA304NC is an Ex nL certified loop powered digital indicator which displays the current flowing in a 4/20mA loop in engineering units. instrument introduces less than a 1.1V drop which allows it to be installed into almost any 4/20mA current loop. -
Page 4: Zones, Gas Groups & T Rating
BA304NC must not exceed: top outer surface of the enclosure. It shows the ATEX certification information plus BEKA associates name and location. 40mA dc 0.2W The instrument serial number and date of manufacture are shown on a separate label within Providing the maximum input current in the instrument enclosure. -
Page 5: Remote Indication
Apparatus in safe area must not be supplied from nor contain under normal conditions a source of potential with respect to earth in excess of 250V rms or 250V dc. Both M20 entries must be fitted with an Ex e or Ex n certified cable gland or blanking plug. -
Page 6: Installation Procedure
5.2 Installation Procedure 5.3 EMC illustrates instrument installation The BA304NC complies with the requirements of procedure. the European EMC Directive 89/336/EEC. specified immunity all 4/20mA wiring should be in a. Remove the enclosure cover by unscrewing screened twisted pairs, with the screen earthed the four captive 'A' screws. -
Page 7: Calibration
6.4 Reverse action Normally the BA304NC display increases as the input current increases, but this can be reversed. Please contact BEKA associates for details. Fig 6 Location of calibration links and potentiometers 6.1 Zero adjustment Zero is defined as the number displayed by the indicator with a 4.000mA input current and may be... -
Page 8: Calibration Example
6.5 Calibration example The BA304NC is required to display: 25.0 with 4.000mA input 115.0 with 20.000mA input i.e. A zero of positive 250 (Ignoring decimal point) A span of 900 (Ignoring decimal point) A decimal point in position 00.0 The following adjustments are required: Step 1 The BA304NC is required to display a positive zero therefore the suppression... -
Page 9: Maintenance
7. MAINTENANCE 7.2 Fault finding after commissioning 7.1 Fault finding during commissioning CAUTION! BA304NC fails function during commissioning the following procedure should be ENSURE PLANT SAFETY BEFORE followed: STARTING MAINTENANCE Live maintenance should only Symptom Cause Solution performed when there is no risk of a No display Incorrect There should be 1V... -
Page 10: 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 11: Accessories
When calibrating a root extracting BA304NC the 8. ACCESSORIES indicator zero potentiometer should be adjusted to 8.1 Engraved scale and tag plates give the required display at 10% of flow (4.16mA). All BA304NC indicators are fitted with blank The indicator zero potentiometer should not be stainless steel scale and tag plates above and used to set the display to zero with a 4mA input. -
Page 12: Display Backlight
Step 6 With 20.000mA input current adjust the 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.
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