User Guide
Product Overview
A detailed overview of the instrument is given in the instruction manual for each product. This should be read before
implementing any system using these instruments, however a summary of the main features is listed below:
Function
The Advisor A90 Universal Panel Meter is a multicolour five digit display 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 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.
Display
The Advisor A90 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.
Analogue Input
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
Changing the input type will reset the Panel Meter to its default settings for that input.
Optional Alarm Outputs
There are two relay changeover outputs available. These are totally isolated and are energised or de-energised
independently according to the status of the Alarm set-points. These can NOT be overridden by issuing any Modbus
commands.
Optional Analogue Output
A totally isolated analogue output is available which is configured as a current sink. This output can be configured to
respond to the analogue input, and can NOT be overridden by issuing any Modbus commands. This option also comes
with an isolated 24V DC power supply output which can be used to supply a 4-20 mA current loop.
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