BEKA BA427E-SS Set Point Station Instruction Manual
- June 9, 2024
- BEKA
Table of Contents
BEKA BA427E-SS Set Point Station
DESCRIPTION
The BA427E-SS is a rugged intrinsically safe Set Point Station housed in a
stainless steel panel mounting enclosure which enables the current flowing in
a 4/20mA loop to be manually adjusted from within a hazardous area. The
BA427E-SS is loop powered and includes a five digit display that may be
calibrated to show the 4/20mA current in linear engineering units.
This abbreviated instruction sheet is intended to assist with installation and
commissioning, a comprehensive instruction manual describing safety
certification system design and calibration is available from the BEKA sales
office or may be downloaded from the BEKA website
www.beka.co.uk/manuals.html.
Typical certification information label
In addition to conventional intrinsic safety certification, the BA427E-SS may be installed in a certified Ex e, Ex p or Ex t enclosure without invalidating the enclosure’s certification.
Special conditions for safe use
The IECEx, ATEX and UKEX certificate numbers have an ‘X’ suffix
indicating that the following special installation conditions apply for some
applications.
When installed in an Ex e, Ex p or Ex t panel enclosure all connections to the BA427E-SS must be made by appropriately rated Zener barriers or galvanic isolators.
This means that when installed in an Ex e, Ex p or Ex t panel enclosure, the BA427E-SS remains an intrinsically safe instrument and must comply with the installation requirements shown in the full instruction manual.
For use in Group IIIC explosive dust atmospheres, the Set Point Station shall be mounted such that the instrument terminals are protected by at least an IP6X enclosure.
This means that a BA427E-SS Set Point Station exposed to a IIIC conductive
dust atmospheres should be mounted in an IP6X panel
enclosure.
INSTALLATION
The BA427E-SS has IP66 front of panel protection but should be shielded from continuous direct sunshine and severe weather conditions. The rear of the instrument has IP20 protection.
Panel cut-out 90 +0.5 / -0.0 x 43.5 +0.5 / -0.0
Connect M4 earth stud to panel enclosure in which Set Point Station is mounted
Support panel wiring to prevent vibration damage
Fig 1 Cut-out dimensions and terminals
Abbreviated instructions for BA427E-SS rugged intrinsically safe panel mounting Set Point Station
Issue 3
24th November 2022
BEKA associates Ltd. Old Charlton Rd, Hitchin, Hertfordshire, SG5 2DA, UK
Tel: +44(0)1462 438301
e-mail: [email protected]
web: www.beka.co.uk
EMC
For specified immunity all wiring should be in screened twisted pairs, with
the screens earthed at one point within the safe area.
Scale card
The Set Point Station’s units of measurement are shown on a printed scale card
visible through a window at the right hand side of the display.
The scale card is mounted on a flexible strip that is inserted into a slot at
the rear of the instrument as shown below.
Thus the scale card can easily be changed without removing the Set
Point Station from the panel or opening the instrument enclosure.
New Set Point Stations are supplied with a printed scale card showing the
requested units of measurement, if this information is not supplied when the
Set Point Station is ordered a blank card will be fitted.
A pack of self-adhesive scale cards printed with common units of measurement
is available as an accessory from BEKA associates.
Custom printed scale cards can also be supplied.
To change a scale card, unclip the protruding end of the flexible strip by
gently pushing it upwards and pulling it out of the enclosure.
Peel the existing scale card from the flexible strip and replace it with a new
printed card, which should be aligned as shown below.
Do not fit a new scale card on top of an existing card.
OPERATION
The BA427E-SS Set Point Station is controlled and configured via four front panel push buttons located below the display. In the operating mode i.e. when the Set Point Station is controlling the loop current and the display is showing the output in engineering units, these push buttons have the following functions:
-
Output current slowly decreases. After five seconds the rate of change accelerates so that large changes may be made quickly. Push ) button first followed by & button to decrease output current. -
Output current slowly increases. After five seconds the rate of change accelerates so that large changes may be made quickly. . Push ) button first followed by button to increase output current.
Optional depending on configuration
Pushing this button for 5 seconds enables the Set Point Station output to be entered digit by digit in engineering units using the & or * push button to adjust the flashing digit and the ( button to move control to the next digit. When set as required pressing the ) button will enter the new set point value and the output current will change. -
E While this button is pushed the BA427E-SS Set Point Station will display one of three alternatives depending upon how the instrument has been configured. Output current in mA; output current as a % of span or provide access to the pre-set outputs.
-
While this button is pushed the Set Point Station will display the numerical value the Set Point Station has been calibrated to display with a 4mA or 20mA output.
-
P+E Access to configuration menu via optional security code.
CONFIGURATION
The BA427E-SS Set Point Station is supplied calibrated as requested when
ordered, if not specified default configuration will be supplied but can
easily be changed on-site.
Fig 6 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.
Access to the configuration menu is obtained by pressing the ( and ) buttons
simultaneously. If the Set Point Station security code is set to the default
0000 the first parameter rE5n will be displayed. If the Set Point Station
configuration menu is protected by a non-default security code, CodE will be
displayed and the non-default code must be entered to obtain access to the
menu.
Resolution to select 1, 10 or 100 least significant digit adjustment
resolution
Decimal point to select position of dummy decimal point
Calibration of set point station display using external current meter
Using AdJ in the 2Ero function set the required output current by pressing
Press P and enter the corresponding display by pressing and P to move to the
next digit Similarly adjust 5PAn functions Any output currents may be used
providing difference is greater than 4mA
Calibration of set point station display using internal reference
Using the 4.000 function set required display at 4mA output by pressing and P
to move to the next digit
Similarly, using 20.000 function set required display at 20mA output
High and Low current output limits
Using Lo function set required minimum output current by pressing and P to
move to the next digit
Similarly, using Hi function set required maximum output current
Alternative methods of calibrating the set point station display
Fig 6 Configuration menu
Manuals, certificates and data-sheets can be downloaded from http://www.beka.co.uk/ba427e-ss
The BA427E-SS is CE marked to show compliance with the European Explosive
Atmospheres Directive 2014/34/EU and the European EMC Directive 2014/30/EU.
It is 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).
References
- BA427E and BA427E-SS Set point stations [set point generator], Intrinsically safe
- Instruction manuals