CTI EM2 Series, Installation And Operation Manual

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15
EM2
Deadband
The deadband or zero-blanking value prevents the
screen from showing values lower than the deadband
setpoint. For example, a deadband setpoint of 5 on
a range of 0-100 ppm would only display 0 ppm until
the input reaches 5 ppm. Deadband values range from
0-5% of full-scale in 1% increments.
Set Delay
Select the delay time for the relay to change states
once the alarm setpoint is reached. The maximum
delay time is 900 seconds (15 minutes). Default value
is 2 seconds.
Reset Delay
Select the length of time for the relay to reset once
the signal drops down below the alarm setpoint. The
maximum delay time is 900 seconds (15 minutes).
Default value is 10 seconds.
Alarm Direction
Select either Upscale or Downscale for alarm direction.
Typically, Downscale would only be used for oxygen
depletion applications, although other applications
such as temperature and pressure monitoring may
require a Downscale alarm. Default value is Upscale.
Latching
Selecting Yes will allow the relay to latch
(recommended for equipment shutdown) requiring
manual reset from the keypad only after the alarm
has cleared. Selecting No allows the relay to reset
automatically after the alarm has cleared. Default
value is Yes.
Failsafe
Selecting On allows the relay to be energized during
normal operation. Loss of power or an alarm condition
will cause the relay to change states. Default value is
On.
Relay Trip On Fault
Selecting On will cause the relay to change states if a
sensor fault is detected (1mA or less). Default value
is On.
Backlight
Select On or Off for preferred viewing. Default value
is On.
Beep
Select On or Off for keypad beep. Default value is On.
Top Menu
To add a layer of security, the Top Menu screen can be
turned Off. With the Top Menu turned Off, entering
the Config, Test and In/Out Adjust screens are only
possible by using specific key combinations, described
in this manual. Default value is On.
Averaging
Select On or Off. With averaging On, the sensor
signal will be averaged over a 1 minute time-weighted
average. This feature can help smooth out jumpy
readings. Default value is Off.