|
The main application of
these instruments is to display a measured variable in meaningful
engineering units within a hazardous area. The zero and span of the
display are independently adjustable allowing the indicator to be
calibrated to display any linear variable represented by the 4/20mA
signal. A root extractor and an adjustable sixteen segment
lineariser enables the indicator to display flow and non-linear
variables such as tank level in linear engineering units. For
weighing applications a tare function is included. These digital
indicators are often used in an intrinsically safe transmitter loop
protected by a
Transmitter Barrier. Sometimes the signal originates in
the safe area and the signal sent to these displays using a
Current Driver Barrier.
Backlight:
A bold digital display provides maximum contrast and has a very wide
viewing angle, allowing these indicators to be read easily in most
lighting conditions over a wide temperature range. An optional
factory fitted backlight is available for applications in poorly
illuminated areas. The backlight which may be loop or separately
powered is available as a factory fitted option. It provides green
background illumination allowing the display to be read at night or
in poorly illuminated areas. When powered from the 4/20mA loop no
additional intrinsically safe interface or wiring is required and
the indicator input remains compliant with the requirements for
simple apparatus. Powering from a separate supply produces a
brighter backlight but requires an additional intrinsically safe
interface and field wiring. Two backlights may be separately powered
from one intrinsically safe interface. Alarms:
Optional dual alarm outputs which can switch hazardous or safe area
loads, such as sounders, beacons or solenoid valves, are available
as a factory fitted option. The two galvanically isolated solid
state alarm outputs may be independently conditioned as high or low
alarms with normally open or closed outputs. Annunciators on the
display show the status of both alarm outputs.
If a suitable mounting enclosure is not readily
available, these indicators are available in their own IP66
enclosure, see
Field Mounted Indicator models.
Indicators are ATEX certified:
Gas - Group
II Category 1G Ex ia IIC T5 Ga -40°C ≤ Ta ≤ +70°C
Dust - Group
II Category 1D Ex ia IIIC T80°C Da IP20 -40°C ≤ Ta ≤ +70°C (BA326C
Bargraph is not Dust Certified))
IP66 Degree of Production on front (IP65 on
BA326C), IP20 at rear. LCD Display and powered by the 4-20mA
loop.
Click on Type/Datasheet to access Full Data Sheet |
