BEKA Advisor A90-SS User manual

Issue: 2
13th April 2017
Advisor A90-SS
Rugged universal process
panel meter with
multicolour display
Issue 2

1. Description
2. Operation
2.1 Controls
3. Applications
3.1 Power supply
3.1.1 Mains powered version
3.1.2 DC powered version
3.2 Signal inputs
3.2.1 Current input
3.2.2 Voltage input
3.2.3 Resistance thermometer input
4. Installation
4.1 Location
4.2 A90-SS earthing
4.3 EMC
4.4 Installation procedure
4.5 Scale card
5. Configuration and Calibration
5.1 Summary of configuration
functions.
5.2 Input type: input
5.3 Meter function: func
5.4 Units of temperature: deg
5.5 Display resolution: re5n
5.6 Decimal point: dp
5.7 Calibration of digital display using
external source: cal
5.8 Calibration of digital display using
internal reference: 5et
5.9 Trim temperature display: tri
5.10 Bargraph format and calibration: bar
5.11 Function of ( push button: u--p
5.12 Tare function: tare
5.13 Maximum andminimum hold
function: hold
5.14 Select meter display colour: color
5.15 Security code: code
5.16 Reset to factory defaults: r5et
5.17 Under and overrange
6. Maintenance
6.1 Fault finding during commissioning
6.2 Fault finding after commissioning
6.3 Servicing
6.4 Routine maintenance
6.5 Guarantee
6.6 Customer comments
7. Accessories
7.1 Scale card
7.2 Tag information
7.3 Alarms
7.3.1 Alarm relay contacts
7.3.2 Configuration and adjustment
7.3.3 Alarm enable: enbl
7.3.4 Setpoint adjustment: 5p1
7.3.5 Alarm function: hi.lo
7.3.6 Alarm relay energised or
de-energised in alarm
condition: nd.ne
7.3.7 Hysteresis: h5tr
7.3.8 Alarm delay: dela
7.3.9 Alarm silence time: 5il
7.3.10 Flash display when alarm
occurs: fla5h
7.3.11 Latch alarm output: latch
7.3.12 Display colour in alarm
condition: color
7.3.13 Access setpoint in display
mode: ac5p
7.3.14 Adjusting alarm setpoint from
the display mode
7.3.15 Display setpoints on the
bargraph.
7.4 4/20mA output and transmitter supply
7.4.1 4/20mA loop design
7.4.2 System design for powering a
transmitter.
7.4.3 Configuration and calibration
7.4.4 4/20mA enable: enbl
7.4.5 Display which corresponds to
4mA output: 4.000
7.4.6 Display which corresponds to
20mA output: 20.000
7.4.7 RTD fault detection: fault
22222222222
The A90-SS process panel meter is CE marked to show compliance with the European EMC
Directive 2014/30/EU and the Low Voltage Directive 2014/35/EU.
CONTENTS

1. DESCRIPTION
The Advisor A90-SS Rugged Universal Panel
Meter is a multicolour five digit instrument,
primarily intended for displaying a current, voltage
or resistance analogue process signal in
engineering units. The instrument can also display
temperature directly from a resistance
thermometer. The A90-SS is configurable on-site
using the four front panel push buttons and an
intuitive menu that can be protected by a security
code to prevent accidental adjustment.
Housed in a rugged stainless steel case with a
toughened glass window providing IP66 front of
panel ingress protection, the A90-SS is ideal for
installion in environments where it is liable to be
impacted.
The A90-SS Process Panel Meter employs a novel
technique that enables the display to be in any
colour on a black background, readable in all
conditions from total darkness to bright sunlight.
The display intensity is fully adjustable to match
other instruments and preserve operator's night
time vision.
When fitted with optional alarms the display colour
can be linked to the alarm status. For example, a
green display could indicate normal operation, the
display colour changing to red when a high alarm
occurs and to blue when a low alarm occurs.
The instrument input type and range are selectable
on-site and the meter display can be calibrated to
show the engineering variable represented by the
analogue input. The engineering units of
measurement such as kg, gallons/hour or ºC, can
be printed on the slide-in scalecard.
One of the following input ranges may be selected:
Voltage input
0 to 100mV
0 to 1V
0 to 10V
Current input
4 to 20mA
0 to 50mA
Resistance thermometer input
2 or 3 wire connected PT100 resistance
thermometer, or differential output from two
PT100 resistance thermometers.
-200 to 850ºC
There are two versions of the A90-SS Process
Panel Meter, one powered by a low voltage dc
supply and the other by a mains ac supply. The
instrument power supply type is shown on the label
adjacent to the power supply terminals 7 and 8.
dc powered model 10 to 36V
ac powered model 90 to 264V 47 - 63Hz
2. OPERATION
Fig 1 shows a simplified block diagram of the
A90-SS Process Panel Meter. Field wiring
terminals are the same for the low voltage dc
powered version and for the mains ac powered
version.
Terminals for the optional factory fitted alarms and
4/20mA output plus 24V transmitter supply are only
fitted when the option is included.
Each time power is applied to the meter
initialisation is performed during which all
segments of the display are activated, after a few
seconds the instrument enters the display mode
using the calibration information stored in the
instrument memory.
Fig 1 A90-SS panel meter block diagram
3

2.1 Controls
The Advisor A90-SS panel meter is controlled and
calibrated via the four front panel push buttons
located below the display. In the display mode i.e.
when the meter is displaying a process variable,
these push buttons have the following functions:
(While this button is pushed the meter
will display the input as a percentage of
the instrument span or, depending
upon configuration, the analogue input
in milliamps, volts or ohms.
When optional alarms are fitted and the
latch function latch is enabled,
pressing this button will de-latch the
alarm output.
When the alarm silence time 5il is set
to any value other than zero, operating
this button clears the alarm for the
configured silence time.
&While this button is pushed the meter
will display the numerical value and
analogue bargraph the meter has been
calibrated to display with a minimum
input I.e. 4mA or 0V. When released
the normal display in engineering units
will return.
If the hold function hold is enabled,
operating this button will cause the
meter to display the lowest value since
the hold function was last reset by
operating the &and * buttons
simultaneously.
*While this button is pushed the meter
will display the numerical value and
analogue bargraph the meter has been
calibrated to display with a maximum
input I.e. 20mA or 1V. When released
the normal display in engineering units
will return.
If the hold function hold is enabled,
operating this button will cause the
meter to display the highest value since
the hold function was last reset by
operating the &and * buttons
simultaneously.
)Unused unless tare function tare is
enabled. When tare function is
enabled operating this button for less
than 3 seconds toggles the meter
display between the gross and net
values. The ‘T’ annunciator is
activated when the net display is
shown. Operating the
)button for
more than 3 seconds tares the display
by setting it to zero.
) + &When both buttons are operated
simultaneously for more than 3
seconds slowly decreases display
brilliance.
) + *When both buttons are operated
simultaneously for more than 3
seconds slowly increases display
brilliance.
(+ &Shows firmware number followed by
version.
( + *Direct access to the alarm setpoints
when optional alarms are fitted to the
meter and the ac5p access setpoints
in display mode function has been
enabled.
& + *Resets the maximum and minimum
hold memories when the hold
function is enabled.
(+ )Access to configuration menu via
optional security code.
4

3. APPLICATIONS
3.1 Power supply
3.1.1 Mains powered version
The mains powered version of the A90-SS panel
mounting meter will operate from a wide range of
voltage and frequency ac supplies.
Voltage 90 to 264V rms ac
Frequency 47 to 63Hz
Power 2.5W
The supply should be well regulated and free from
transients.
3.1.2 DC powered version
The DC powered version of the A90-SS panel
mounting meter is designed to be operated from a
nominal 24V dc instrument power supply but, as
shown below, will function with a wide range
supply voltages.
Voltage 10 to 36V dc
Current 200mA at 10V
56mA at 36V
3.2 Signal inputs
The A90-SS panel meter can measure current and
voltage process signals and display them in
meaningful engineering units. The meter can also
display temperature in a variety of formats from a
Pt100 resistance thermometer primary element.
Selection of the input type is made within the
configuration menu which is described in section 5
of this manual. Input terminals also vary for
different inputs as shown in Fig 6.
3.2.1 Current input
The A90-SS panel meter can measure and display
in engineering units any process signal
represented by an analogue linear or square law
current such as a 4/20mA process signal. The
A90-SS has two current input ranges 4-20mA and
0-50mA dc.
The current input terminals 13 and 14 are
galvanically isolated from the A90-SS meter power
supply and all other outputs which allows the A90-
SS meter to measure the current in any process
loop without affecting the accuracy of the loop.
When connected in series with a current loop the
A90-SS panel meter introduces the following
voltage drops:
At 20mA 1.0V
At 50mA 1.5V
Fig 2 shows how the A90-SS panel meter should
be connected to measure a process current.
Fig 2 A90-SS Process panel meter measuring
current.
3.2.2 Voltage input
The A90-SS panel meter can measure and display
in engineering units any linear process signal
represented by an analogue voltage such as a 0 to
1V signal. The voltage input terminals 11, 12 and
13 are galvanically isolated from the A90-SS meter
power supply and all other outputs. There are
three dc voltage input ranges:
Input
Terminals resistance
0 to 0.1V 13 (0V) and 12 (+ve) 5MΩ
0 to 1.0V 13 (0V) and 12 (+ve) 5MΩ
0 to 10V 13 (0V) and 11 (+ve) 1MΩ
The input resistance of all the voltage inputs is high
allowing the A90-SS meter to measure any
process voltage signal without loading it and
changing the value. Fig 3 shows how the A90-SS
panel meter should be connected to measure a
process voltage.
Fig 3 A90-SS Process panel meter measuring
voltage.
3.2.3 Resistance thermometer input
The A90-SS panel meter can measure the
resistance of a single Pt100 BS EN 60751 platinum
resistance thermometer and display the
corresponding temperature in a variety of units
including ºC and ºF. The resistance thermometer
may be connected to the meter via two or three
wires. The differential output of two resistance
thermometers can also be measured and
displayed.
5

Fig 4 shows the connections for two and three wire
resistance thermometers and Fig 5 the
connections for differential measurements.
Fig 4 Connections for a 2 or 3 wire resistance
thermometer.
Fig 5 Connections for differential resistance
thermometer measurements.
6

4. INSTALLATION
4.1 Location
The A90-SS panel meter has a rugged stainless
steel case with a 10mm thick toughened glass
window. The case provides 7J and the window 4J
front of panel impact protection. The captive
silicone gasket, which seals the joint between the
instrument and the panel enclosure, ensures IP66
front of panel ingress protection. The instrument
has IP20 rear protection.
Although the front of the meter has IP66 protection,
it should be shielded from continuous direct
sunlight and severe weather conditions
The meter may be installed in any panel providing
that the operating temperature is between –40ºC
and +55ºC.
Fig 6 shows the overall dimensions of the
instrument together with the recommended panel
cut-out dimensions to achieve an IP66 seal
between the instrument enclosure and the
instrument panel.
4.2 A90-SS earthing
The A90-SS panel meter complies with the Low
Voltage Directive 2014/35/EU and has the
following isolation between circuits:
AC powered model supply input 3kV rms
DC powered model supply input 1.5kV
Alarm contacts 4kV rms
All other circuits 500V rms
The A90-SS stainless steel enclosure is totally
isolated from the meter circuits but for personnel
safety should be earthed. This can be achieved
via the earth terminal on the meter power supply
plug, or via the M4 earth stud on the rear panel of
the meter.
Fig 6 show the overall dimensions of the indicators
together with the recommended panel enclosure
cut-out dimensions.
Fig 6 A90-SS meter dimensions and terminals
Panel wiring should be supported to prevent
vibration causing damage to the wiring or
terminals.
4.3 EMC
The A90-SS panel meter complies with the
requirements of the European EMC Directive
2014/30/EU. For specified immunity all signal
wiring should be screened with the screens
earthed at one point. Voltage and current input
wiring should be in twisted pairs.
7

4.4 Installation Procedure
a. Cut the aperture specified in Fig 6 in the
panel enclosure. Ensure that the edges of
aperture are de-burred.
b. Inspect the meter's captive gasket and
ensure that it is not damaged before inserting
the meter into the panel enclosure aperture.
c. If the enclosure panel is less than 1.0mm
thick, or is non-metallic, an optional BEKA
stainless steel support plate should be slid
over the rear of the indicator before the panel
clamps are fitted to evenly distribute the
clamping force and prevent the enclosure
panel being distorted or creeping.
d. Slide a panel clamp into the two grooves at
each corner of the indicator housing with the
M3 stud protruding through the hole at the
rear of the clamp. Fit the stainless steel
spring washer over the stud and secure
with the stainless steel wing nut.
e. Evenly tighten the four clamps to secure the
instrument. The recommended minimum
tightening torque for each wing nut is 22cNm
(1.95 lbf in).
f. Connect the panel enclosure wiring to the
rear terminal blocks. The terminals may be
removed from the instrument by pulling.
Fig 7 Fitting panel mounting clamps
4.5 Scale card
The meter’s units of measurement may be shown
on a scale card visible through a window at the
right hand end 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 8.
Thus the scale card can easily be changed without
removing the meter from the panel or opening the
instrument enclosure.
New meters are supplied with a printed scale card
showing the requested units of measurement. If
this information is not supplied when the meter 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 indicator,
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 indicator as
shown below.
Fig 8 Inserting flexible strip carrying scale card
into slot at the rear of the A90-SS meter.
8

5. CONFIGURATION AND CALIBRATION
The A90-SS process panel meter is configured and
calibrated via the four front panel push buttons. All
the configuration functions are contained in an
easy to use intuitive menu that is shown
diagrammatically in Fig 9.
Each menu function is summarised in section 5.1
and includes a reference to more detailed
information. When the meter is fitted with alarms
additional functions are added to the menu which
are described in section 7.3. Similarly when a
4/20mA output is fitted, additional functions appear
in the configuration menu which are described in
section 7.4.
Throughout this manual push buttons are shown
as (,), &and *and legends displayed by
the meter are shown in a seven segment font
exactly as displayed e.g. CAL and ALr2.
Access to the configuration menu is obtained by
operating the (and )push buttons
simultaneously. If the meter security code is set to
the default 0000 the first parameter input will be
displayed. If a security code other than the default
code 0000 has already been entered, the meter will
display CodE. Pressing the (button will clear this
prompt allowing each digit of the code to be
entered using the *or &push button to adjust
the flashing digit and the (button to move control
to the next digit. When the correct four digit code
has been entered, pressing ) will cause the first
parameter input to be displayed. If the code is
incorrect, or a button is not pressed within twenty
seconds, the meter will automatically return to the
display mode.
Once within the configuration menu the required
parameter can be reached by scrolling through the
menu using the *or &push button as shown in
Fig 9. When returning to the display mode
following reconfiguration or recalibration, the meter
will display dAtA followed by 5AVE while the new
information is stored in permanent memory.
CAUTION
When making adjustments in the configuration
menu, if the interval between pressing any
button exceeds one minute, the A90-SS meter
will automatically return to its display mode
and any configuration changes will not be
saved.
All new meters are supplied configured and
calibrated as requested at the time of ordering. If
calibration is not requested, meters will be
configured as follows:
Input input 4-20
Function FunC 5td
Resolution rE5n 1
Decimal point dp 000.00
Display at 4mA 2ero 0.00
Display at 20mA 5PAn 100.00
Bargraph type left
Bargraph start BarLo 0.00
Bargraph finish BarHi 100.00
(button in display mode u--p PC
Tare tArE Off
Max and min hold hold off
Display colour color green p5et ..4
Access code CodE 0000
Default configuration can easily be changed
on-site.
9

Fig 9 Configuration menu
E
P E P E
Security Code
Enter code by
pressing
* or & and (
to move to next
digit. Code 0000
allows direct
access to
the menu
Function
or
to select
5td function
Root extractor
E
P E
E
P E
Resolution
or
to select
resolution
of least
significant
digit
Decimal point
or
to select
position of
displayed
decimal point
P E
P E P E
Only appears when
voltage or current
inputs are selected
Only appears when
voltage or current
inputs are selected
E
Calibration using
external analogue source
(Preferred method)
With accurate analogue input
set required zero display by
pressing or and
to move to the next digit
or decimal point.
Similarly, using accurate
analogue input set required
full scale display
* Required input must be
adjusted before the zero or
span function is operated.
Any analogue input within
the input range may be used
providing difference is > 25%
*
E
P
P
P E
P E P E
E
Calibration using
internal references
(Analogue input may be any value)
Using 2Ero function set required
display at the minimum of
the selected range by
pressing or and
to move to the next digit.
Similarly, using 5PAn function set
required display at the maximum
analogue input of the selected range.
E
P
PE
Only appears when
RTD inputs
are selected
Only appears
when RTD
inputs are
selected
P E
P E P E
E
Trim temperature display
With an accurate input trim meter 2ero display
by pressing or and to move to the
next digit. Similary with an accurate input trim
meter 5pan display.
To clear the trim corrections, press in clr.t
function press or to select ye5. Press
to action the clear. A confirmation t. clrd
will be displayed for 3 seconds.
E
P
E
P E
P
Display
mode
EE
P
E E
P E
Function
or
to select
Standard
function
Root extractor
Lineariser
P
Display
mode
EE
P
E E
P E
Input type
or
to select
4-20
0-50
d-rtd
2rtd
3rtd
0.1u
1u
10u
Confirm
selection by
entering 5ure
by pressing
or &
to move to
next digit.
input
4-20
E
P E
E
P E
E
P E
E
P E
Units of Display
or
to select
units of
display.
°C
h
°F
r
re5s
deg
°c
°o
Only appears
when current
inputs are
selected
tri
P
E
clrclr.t
no
P
E
°o
°o
*
DISPLAY
10