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
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Содержание Advisor A90-SS
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