Laurel Electronics Laureate Thermocouple Panel Meter-Controller - Manual (Page 3)

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 3
Mechanical
Application Examples
Operation as a 4-20 mA Transmitter
With the optional analog output board, Laureate temperature
meters can serve as superb, isolated 4-20 mA transmitters. The
analog output is scaled to the display, which is linearized to °C
or °F and is exceptionally accurate. The analog output further
tracks the high read rate of the meter, at up to 60 readings per
second at 60 Hz power. Fast update rates are beneficial in
many closed-loop and PID control applications.
Operation as a Fast Controller
With the dual contact relay or dual solid state relay output board
options, Laureate temperature meters can serve as extremely
fast and accurate ON/OFF controllers for closed-loop
temperature control. Multiple setpoint operating modes are
individually selectable for each relay, as explained in the dual-
setpoint controller section. Relay duty cycles and chatter can be
minimized with programmable hysteresis and time delays. High
duty cycles and extremely fast response times are possible with
the solid state relay, which has a typical response time of only
17 ms.
Operation as a Supervisory Monitor
By using the optional dual contact relay or dual solid state relay
output options, Laureate temperature meters can monitor
processes and provide alarms or shutoffs when these
processes exceed normal limits. A band deviation operating
mode can be selected for each relay, where an alarm is
generated whenever the reading is a selected number of counts
above or below the setpoint. Relay operation can be selected
as latching or non-latching. When an alarm or shutdown
condition is reached, a latched output will remain in the alarm
condition until it is reset by a front panel pushbutton, via the
serial interface, or via the rear connector.