BEKA BA358E User manual

Issue: 6
19th April 2016
BA358E
Intrinsically safe
4/20mA l p-p wered
panel m unting
Rate T taliser
Issue 6

1. Descripti n
2. Operati n
2.1 Controls
2.2 Displays
3. Intrinsic Safety Certificati n
3.1 ATEX gas certificate
3.2 Zones, gas groups & T rating
3.3 pecial conditions for safe use
3.4 4/20mA input
3.5 Reset terminals
3.6 Certification label information
4. System Design f r Hazard us Areas
4.1 Flow transmitter loops
4.2 Resetting the total display to zero
4.3 Remote indication
5. Installati n
5.1 Location
5.2 EMC
5.3 Installation procedure
5.4 cale card
6. C nfigurati n and Calibrati n
6.1 Calibration structure
6.2 Accessing configuration & calibration
functions.
6.3 ummary of configuration
functions.
6.4 Rate totaliser function
6.5 Display resolution
6.6 Display update time
6.7 Upper display
6.8 Lower display
6.9 Position of decimal points
6.10 Calibration of rate display using an
external current source.
6.11 Calibration of rate display using internal
reference.
6.12 Clear grand total
6.13 Timebase
6.14 Function of P push button
6.15 Total scale factor
6.16 Clip off
6.17 Local reset of total and grand total
displays.
6.18 ecurity code
6.19 Reset to factory defaults
6.20 Over-range
7. Lineariser
7.1 Calibration using external current
source.
7.1.1 Example, Adding break-points
to a new Rate Totaliser
7.2 Calibration using internal reference
7.2.1 Example, Adding break-points
to a new Rate Totaliser
7.3 Error messages
7.4 Under and over-range
7.5 Default configuration
8. Calibrati n Examples
8.1 Using an external current source
8.2 Using the internal reference
9. Maintenance
9.1 Fault finding during commissioning
9.2 Fault finding after commissioning
9.3 ervicing
9.4 Routine maintenance
9.5 Guarantee
9.6 Customer comments
10. Access ries
10.1 cale card
10.2 Tag information
10.3 Alarms
10.3.1 olid state output
10.3.2 Intrinsic safety
10.3.3 Configuration and adjustment
10.3.4 Alarm enable
10.3.5 Type of alarm
10.3.6 etpoint adjustment
10.3.7 Alarm function
10.3.8 Alarm output status
10.3.9 Hysteresis
10.3.10 Alarm delay
10.3.11 Alarm silence time
10.3.12 Flash display
10.3.13 Access setpoint
10.3.14 Adjusting alarm setpoints
from display mode.
10.4 Display backlight
10.4.1 Loop powered
10.4.2 eparately powered
Appendix 1
ATEX dust certification
Appendix 2
IECEx certification
Appendix 2
FM and cFM certification
22
The BA358E is CE marked to show compliance with the European Explosive Atmospheres Directive
94/9/EC and the European EMC Directive 2004/108/EC
CONTENTS

1. DESCRIPTION
The BA358E is a panel mounting intrinsically safe
4/20mA loop-powered Rate Totaliser primarily
intended for use with flowmeters. The instrument
simultaneously displays the rate of flow and the
total flow in engineering units on two separate
displays. The BA358E only introduces a 1.2V
drop, which allows it to be installed into almost any
4/20mA flow loop. No additional power supply or
battery is required.
The rate totaliser has been certified intrinsically
safe for use in gas and dust hazardous areas by
Notified Body Intertek Testing and Certification Ltd
and complies with the European ATEX Directive
94/9/EC. The EC-Type Examination certificate
specifies that under fault conditions the output
voltage, current and power at the 4/20mA input
terminals will not exceed those specified for simple
apparatus in Clause 5.7 of EN 60079-11, which
simplifies installation and documentation.
For international applications the BA358E has
IECEx, FM and cFM certification which are
described in Appendixes 2 and 3.
2. OPERATION
Fig 1 shows a simplified block diagram of a
BA358E. The 4/20mA input current flows through
resistor R1 and forward biased diode D1. The
voltage developed across D1, which is relatively
constant, is multiplied by a switch mode power
supply and used to power the instrument. The
voltage developed across R1, which is proportional
to the 4/20mA input current, provides the input
signal for the analogue to digital converter.
Each time a 4/20mA current is applied to the
instrument, initialisation is performed. After a short
delay the following display sequence occurs which
takes about twelve seconds:
All segments of the display are activated
Loading message displayed
Configuration message displayed
Model and firmware version displayed
The BA358E Rate Totaliser starts
functioning, using configuration information
stored in the instrument’s permanent
memory. Unless total and grand total
displays have been reset to zero, new flow
will be added to the existing totals.
If the 4/20mA current is disconnected during
operation the latest total and grand total are stored
in permanent memory.
Fig 1 implified block diagram of BA358E
2.1 C ntr ls
The BA358E is controlled and calibrated via four
front panel push buttons located below the display.
In the operating mode i.e. when the instrument is
displaying rate and total flow the push button
functions are:
Summary f Push Butt n Functi ns
PDisplays input current in mA or as a
percentage of span. Modified when
optional alarms are fitted.
▼ hows rate display calibration at 4mA
input.
▲ hows rate display calibration at
20mA input.
Ehows time since instrument was
powered or total display was reset.
E+▼ Grand total –
displays least significant 8 digits
E+▲ Grand total –
displays most significant 8 digits.
▼+▲ Resets total display
Configurable function
P+▼ hows firmware version
P+▲ Alarm setpoint access
Configurable function
P+E Access to configuration menu
3

Full Descripti n f Push Butt n Functi ns
PWhile this button is pushed the rate
display will show the input current in
mA, or as a percentage of the
instrument span depending upon how
the instrument has been configured.
When the button is released the normal
display in engineering units will return.
The function of this push button is
modified when optional alarms are fitted
to the instrument.
▼While this button is pushed the
instrument will show the calibrated rate
display with 4mA* input - usually zero
for flow applications. When the button
is released the flow rate will again be
displayed.
▲ While this button is pushed the
instrument will show the calibrated rate
display with 20mA* input. When the
button is released the flow rate will
again be displayed.
EWhile this button is pushed the Rate
Totaliser will display the time in hours,
minutes and seconds since the
instrument was powered or the total
display was reset. The elapsed time is
not saved when power is removed.
E+▼ While these buttons are pushed the
total display will show the least
significant eight digits of the grand total,
and the grand total annunciator will be
activated.
E+▲ While these two buttons are pushed the
total display will show the most
significant eight digits of the grand total
and the grand total annunciator will be
activated.
After the two buttons have been pushed
for ten seconds ‘CLr no’ with the ‘no’
flashing will be displayed. If no action
is required, pressing E will return the
instrument to the operating mode.
Operating the ▼ or ▲ button will toggle
the display to ‘CLr YE ’ with ‘YE ’
flashing, operating the E button will then
clear the grand total and ‘Gt CLrd’ will
be displayed to confirm the operation.
The instrument will then automatically
return to the operating mode.
electable function in the configuration
menu. ee section 6.17
N te: Totalisation will continue until
‘CLr no’ or ‘CLr YE5’ are displayed.
▼+▲ Resets the total display to zero
when these two push buttons are
operated simultaneously. electable
function in the configuration menu.
ee section 6.17
P + ▼ Rate Totaliser displays firmware
version.
P + ▲ Provides direct access to the alarm
setpoints when optional alarms are
fitted to the Rate Totaliser and the
‘AC5P’ access setpoints in display
mode function has been enabled.
ee section 10.2.13
P+E Provides access to the configuration
menu via optional security code.
N te: * If the Rate Totaliser has been
calibrated using the CAL function,
calibration points may not be 4 and
20mA.
2.2 Displays
The BA358E has two digital displays and
associated annunciators, plus a flow indicator as
shown on page 1.
Lower hows the flow rate on the five digit
display plus sign 12mm high display.
Upper hows the total flow on the eight digit
display (seven with negative sign) 18mm high
display which may be reset to zero by
operating the ▼ + ▲ instrument push
buttons or by an external contact
closure.
The rate and total displays may be interchanged,
see section 6.7
Flow This disc on the lower left hand side of
indicator the display rotates when the input
current
exceeds 4.000mA, indicating that flow
is being detected by the Rate Totaliser.
For bi-directional flow, the disc rotates
when flow exceeds ±0.05% of span.
Annunciat rs
Reset Activated when total display is reset to
zero by operating the ▼ + ▲ buttons
simultaneously or by connecting the
reset terminals together.
4

Hold Activated when flow rate falls below the
clip-off value and totalisation is
inhibited.
Grand Is a 16 digit (15 digit with negative sign)
Total number which is not zeroed when the
total display is zeroed. The Grand Total
is viewed from the operating mode as
two eight digit numbers, it may be reset
to zero from within the configuration
menu or from the operating mode.
3. INTRINSIC SAFETY CERTIFICATION
The BA358E rate totaliser has ATEX and IECEx
gas and dust certification. This section of the
instruction manual describes ATEX gas
certification. ATEX dust, IECEx and other
approvals are each described in separate
appendixes to this manual.
3.1 ATEX gas certificati n
Notified Body Intertek Testing and Certification Ltd
have issued the BA358E with an EC-Type
Examination Certificate number
IT 11ATEX27254X. This confirms compliance
with harmonised European standards and it has
been used to confirm compliance with the
European ATEX Directive for Group II, Category
1G equipment, Ex ia IIC T5 Ga Ta = -40 to
+70ºC. The Rate Totaliser bears the community
mark and subject to local codes of practice may be
installed in any of the European Economic Area
(EEA) member countries. ATEX certificates are
also acceptable for installations in witzerland.
This section of the instruction manual describes
ATEX installations in explosive gas atmospheres
conforming with EN60079-14 Electrical
Installations in Hazardous Areas. When designing
systems for installation outside the UK the local
Code of Practice should be consulted.
3.2 Z nes, gas gr ups and T rating
The BA358E Rate Totaliser has been certified
Ex ia IIC T5. When connected to a suitable
system it may be installed in:
Zone 0 explosive gas air mixture
continuously present.
Zone 1 explosive gas air mixture likely
to occur in normal operation.
Zone 2 explosive gas air mixture not
likely to occur, and if it does
will only exist for a short time.
Be used with gases in groups:
Group A propane
Group B ethylene
Group C hydrogen
Having a temperature classification of:
T1 450oC
T2 300oC
T3 200oC
T4 135oC
T5 100oC
At ambient temperatures between -40 and +70oC.
N te: The specified operating temperature of the
BA358E is –20 to +70ºC. At temperatures below
–20ºC the instrument will continue to totalise but
the display will not function.
This allows the Rate Totaliser to be installed in all
gas Zones and to be used with most common
industrial gases.
3.3 Special c nditi ns f r safe use
The ATEX certificate has an ‘X’ suffix indicating
that special conditions apply for safe use.
WARNING
T av id an electr static charge being
generated instrument encl sure sh uld
nly be cleaned with a damp cl th.
3.4 4/20mA input
The input safety parameters for the 4/20mA input,
terminals 1 and 3 are:
Ui = 30V dc
Ii = 200mA
Pi = 0.84W
The maximum equivalent capacitance and
inductance between the two 4/20mA input
terminals 1 and 3 is:
Ci = 13nF
Li = 16µH
The maximum permitted loop cable parameters
can be calculated by adding these figures to Ci and
Li of other instruments in the loop and subtracting
the totals from the maximum cable capacitance Co
and cable inductance Lo permitted for the Zener
barrier or galvanic isolator powering the loop.
Although the BA358E does not comply with the
requirements for simple apparatus, the EC-Type
Examination Certificate states that for intrinsic
safety considerations, under fault conditions the
output voltage, current and power at terminals 1 &
3 will not exceed those specified by clause 5.7 of
EN 60079-11 for simple apparatus. This simplifies
the application and intrinsic safety documentation
for a loop into which the BA358E is connected.
Apart from Ci, the affect of the Rate Totaliser may
be ignored when assessing loop safety.
5

3.5 Reset terminals
The BA358E total display may be reset to zero by
connecting the reset terminals R 1 and R 2
together. These two terminals have the following
input and output intrinsic safety parameters:
Ui = 30V dc
Ii = 200mA dc
Pi = 0.84W
Uo = 6V dc
Io = 2.5mA dc
Po = 3.75mW
The maximum equivalent capacitance and
inductance between them is:
Ci = 13nF
Li = 8H
The total display may be reset to zero from within
the hazardous area by any mechanically operated
switch connected directly to terminals R 1 and
R 2. Alternatively, the BA358E may be configured
so that the total display is reset to zero when the ▲
and ▼ push buttons are operated simultaneously
for two seconds.
To reset the total display from the safe area a
Zener barrier or intrinsically safe relay is required
to transfer the contact closure into the hazardous
area. Almost any intrinsically safe relay with
certification permitting the contacts to be
connected to equipment in the hazardous area
may be used. Alternatively, a positive polarity
Zener barrier with intrinsic safety parameters equal
to or less than the input parameters of the reset
terminals may be used as shown in Fig 3A. The
total resistance of the barrier, switch and
interconnecting wiring must be less than 1kΩ.
N te:
The negative reset terminal R 2 is internally
connected to the negative 4/20mA input
terminal 3.
3.6 Certificati n label inf rmati n
The certification label is fitted in a recess on the
top outer surface of the instrument enclosure. It
shows the ATEX certification information and
BEKA associates' name and location. Non
European certification information may also be
shown.
BA358E certification label
6

4. SYSTEM DESIGN FOR HAZARDOUS AREA
4.1 Fl w transmitter l ps
A BA358E Rate Totaliser may be connected in
series with almost any intrinsically safe 4/20mA
flow loop and calibrated to display the rate of flow
and total flow. There are three basic design
requirements:
1. The intrinsic safety output parameters of the
4/20mA loop, which are defined by the Zener
barrier or galvanic isolator powering the loop, must
be equal to or less than:
Uo = 30V dc
Io = 200mA
Po = 0.84W
2. The maximum permitted cable capacitance of the
loop must be reduced by 13nF. The maximum
permitted cable inductance is not reduced by the
inclusion of the BA358E.
3. The loop must be able to tolerate the additional
1.2V required to operate the Rate Totaliser.
When fitted with an optional backlight this
increases to 5.0V if the backlight is loop powered.
ee 10.3.1
Figs 2a and 2b illustrates typical applications in
which a Rate Totaliser is connected in series with a
2-wire flow transmitter powered by a Zener barrier
and alternatively by a galvanic isolator.
Fig 2a Loop powered by a Zener barrier
Fig 2b Loop powered by a galvanic isolator
4.2 Resetting the t tal display t zer
The BA358E total display may be reset to zero by
momentarily connecting the reset terminals R 1
and R 2 together with a resistance of less than
1kΩ. Within the hazardous area in which the
BA358E is located this may be achieved with a
manually activated industrial push button as shown
in Fig 3b.
The push button switch and the wiring connecting it
to the Rate Totaliser must comply with the
requirements for simple apparatus specified in
Clause 5.7 of EN60079-11. i.e. be able to
withstand a 500V rms insulation test for one
minute. The switch button should comply with the
electrostatic requirements specified by Clause 7 of
EN60079-0 and material composition defined in
Clause 8.
If it is required to reset the total display from the
safe area a Zener barrier, galvanic isolator or
intrinsically safe relay must be used to transfer the
contact closure into the hazardous area. Fig 3a
shows how a single channel positive polarity Zener
barrier may be used.
N te:
The negative reset terminal R 2 is internally
connected to the negative 4/20mA input
terminal 3.
4.3 Rem te indicati n
A BA358E may be driven via an intrinsically safe
interface from a 4/20mA safe area signal to provide
a remote indication of rate and total flow within a
hazardous area. The type of interface is not
critical, either a Zener barrier or a galvanic isolator
may be used, providing that Ui, Ii and Pi of the
BA358E 4/20mA input are not exceeded.
If one side of the 4/20mA current loop may be
earthed, a single channel Zener barrier provides
the lowest cost protection. If the 4/20mA signal is
not isolated, then two Zener barriers, a two
channel Zener barrier or a galvanic isolator must
be used.
When the hazard is a IIC gas and two single
channel Zener barriers or a two channel Zener
barrier are used, only one barrier or channel may
be a 28V 93mA device. A 10V 50 or diode
return barrier may be used for the second channel
to form a safe combination.
Again it is necessary to ensure that the voltage
capability of the 4/20mA signal is sufficient to drive
the BA358E Rate Totaliser plus the voltage drop
introduced by the intrinsically safe interface. Figs
3a, 3b and 3c show the alternative circuits which
may be used.
7

Fig 3a implest circuit with one side of
20mA current loop connected to
earth.
Also illustrates resetting from safe area.
Fig 3b Two Zener barrier channels are
required if the 4/20mA current loop
can't be earthed at the barrier busbar.
Also shows optional resetting from
hazardous area
Fig 3c Galvanic isolator can be used with any
4/20mA current loop.
8

5. INSTALLATION
5.1 L cati n
The BA358E Rate Toyslider has a robust glass
reinforced modified PPO enclosure with a
toughened glass window. The front of the Rate
Totaliser has IP66 protection and a gasket seals
the joint between the instrument enclosure and the
panel. The rear of the instrument has IP20
protection.
The Rate Totaliser will function and is certified
intrinsically safe at ambient temperatures between
–40ºC and +70ºC, but the display only functions at
ambient temperatures between –20ºC and +70ºC.
Fig 4 shows the overall BA358E Rate Totaliser
dimensions together with the recommended panel
cut-out dimensions. To achieve an IP66 seal
between the instrument enclosure and the
instrument panel the smaller tolerance aperture
should be used, and the Rate Totaliser should be
secured with four panel mounting clamps.
Although the Rate Totaliser front panel provides
IP66 protection it should be shielded from direct
sunlight and severe weather conditions.
Fig 4 BA358E dimensions
5.2 EMC
The BA358E Rate Totaliser complies with the
requirements of the European EMC Directive
2004/108/EC. For specified immunity all wiring
should be in screened twisted pairs, with the
screens earthed at one point within the safe area.
9

5.3 Installati n Pr cedure
a. Cut the specified aperture in the panel. To
achieve an IP66 seal between the instrument
enclosure and the instrument panel the
aperture must have the tighter tolerances
specified in Fig 4.
b. lide the gasket over the body of the Rate
Totaliser before inserting the instrument into
the panel aperture.
c. Firstly ensure that all the panel mounting
clamps are closed by turning the knurled
screws fully anti clockwise until the two pips
in the clamp foot align with holes in the clamp
body.
d. Place a clamp in the recess on each side of
the Rate Totaliser, pulling gently to slide it
onto the dovetail as shown in Fig 5. Push
the knurled screw slightly forward to engage
the thread and tighten by turning clockwise
until it is just finger tight. When all four
clamps are fitted ensure that the gasket
behind the front panel bezel is correctly
positioned before fully tightening the clamps
to secure the instrument. The maximum
recommended clamp tightening torque is
22cNm (1.95 lbf in) which is approximately
equivalent to finger-tight plus one half turn.
D n t ver tighten.
e. Connect the panel wiring to the rear terminal
block(s) as shown in Figs 4. To simplify
installation, the terminals are removable so
that the panel wiring can be completed
before the instrument is installed.
Fig 5 Fitting panel mounting clamps
5.4 Scale card
The Rate Totaliser’s units of measurement are
shown on a printed scale card in 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 in Fig 6.
Thus the scale card can easily be changed without
removing the BA358E Rate Totaliser from the
panel or opening the instrument enclosure.
New instruments are supplied with a printed scale
card showing the requested units of measurement,
if this information is not supplied when the Rate
Totaliser 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.
Install the new scale card by gently pushing the
flexible strip into the slot at the rear of the
instrument, when it reaches the internal end-stop
secure it by pushing the end of the flexible strip
downwards so that the tapered section is held by
the rear panel.
Align the self-adhesive
printed scale card onto the
flexible strip and insert the
strip into the Rate
Totaliser as shown below.
Fig 6 Inserting flexible strip carrying scale card
into slot at the rear of Rate Totaliser.
10