|
Description
The V408 is an 1/8 DIN, universal,
5 digit indicator with four
alarms, two digital inputs and
one SPDT relay output. Available
with a green or red display,
it accepts temperature inputs
from J, K, T, L, N, R, S, B,
C and Platinel II type thermocouples
and three-wire Platinum 100
Ohm (Pt100) RTDs. Process variables
such as 4-20mA, 1-5V and 0-10V
as well as strain gauge bridge
inputs can also be measured.
Other thermocouple types or
high accuracy 20 to 80 point
custom linearization curves
can be configured at the factory.
Square root extraction or eight-point
curve linearization can be user
defined in the field. A second
process input is available to
accept remote setpoints and
compare signals such as the
average or difference, or selecting
minimum or maximum readings.
Four
programmable setpoint alarms
can be field configured as rate
of change, deviation high or
low, non-latching and high or
low or new, latching. The new
alarm indicates the situation
when a latched alarm has not
been acknowledged and the measured
value crosses the setpoint trip
level a second time. The deviation
alarm enables the user to reference
alarm setpoints relative to
a remote (main) setpoint from
a controller. This remote setpoint
would be a DC signal input to
the optional 2nd process input
module. Alarm hysterisis (deadband)
can be configured from 1 to
9999 process variable units.
Each alarm has a programmable
delay up to 999.9 seconds.
The
alarms can be linked to either
the one standard relay output
or up to three optional relay
or digital output modules. These
alarms can be configured in
combination (e.g., one or all
four alarms linked to one or
all relays) and they will operate
in fail-safe (i.e., normally
energized) or non-fail-safe
modes. Additionally, the display
can be configured for password
protection, limiting access
to any or all functions. An
alarm blocking function is also
configurable to prevent alarm
tripping during process start-up.
Two digital input channels are
provided to accept alarm acknowl-
edgment (e.g., remote pushbutton).
These two digital inputs or
the optional triple-digital
input modules can also be used
for remote setpoint select,
alarm acknowledge, process input
select, bridge zero and span
calibration and tare. Other
functions include indicator
control such as selecting full
menu access, disabling the keypad
lockout or simulating keypad
functions.
The
V408 indicator housing maintains
a NEMA 4 (IP54) front panel
seal and can be removed or unplugged
from the front, without disconnecting
any wiring. By disengaging the
front panel clips the entire
indicator and electronics can
be quickly pulled from the panel.
Thermocouples,
three-wire RTDs, bridge, voltage
and mV signals can be accepted
directly into the indicator.
Current signals such as 4-20mA
are input using the 2.49 Ohm
shunt resistor included with
the indicator and mounting hardware.
The five-digit display (99999)
is available in green or red
and can be field configured
to match the input signal range
to the preferred engineering
units. Offsets and two point
slope adjustments are fully
programmable to compensate for
sensor variances.
|
 |
Application
The V408 is an excellent solution
for temperature, pressure, level,
flow and other process variable
measurements. The modular design
was developed to allow it to
be optimally configured for
most indication, alarm and data
acquisition applications.
The
wide variety of option modules
and programming functions make
the V408 a valuable plant-wide
indication solution. For example,
the secondary input enables
functions such as differen-
tial measurement and summing
with the use of K values for
signal scaling. This function
is useful in monitoring the
mixing of products or raw materials.
The deviation alarm can be used
to ensure that a product is
not diluted or spoiled by significant
process excursions beyond the
setpoint.
The
field configurable V408 is an
ideal standardized solution
for a variety of temperature
measurement and on-off control
appli- cations. For example,
it can be used to control the
heating and cooling elements
in an oven or environmental
control system using two setpoints
for the high and low temperature
limits. Similarly, a 4-20mA
or bridge pressure signal can
be monitored and the setpoints
can be used to control or alarm
the gas pressure or liquid levels
in a tank. Weight, flow, pressure,
temperature, speed, position
and rate are just some of the
process variables that can be
accurately displayed and monitored
with this flexible and effective
indicator.
|
