Can I Use an External Alarm with the TV2?
The TV2 is equipped
with a N/O (normally open) dry-contact relay that can trigger an alarm,
a buzzer, a bell,
a
light, an auto dialer, or other warning device. Since the relay
is a dry-contact relay there is no power supplied when it closes, however
an external alarm or light which has it's own power supply can be wired
through the relay (<30v) so it will activate when an alarm occurs.
The relay's 'trigger conditions' are set for each sensor with the alarm menu. The alarm must be 'enabled' for it to work properly. Each sensor has a high and a low set-point with a delay time. Setting the delay properly will ensure that false alarms will be eliminated. More information can be found on how the alarm works in the 'Alarm Behavior' note.
Once an alarm is triggered the internal speaker will sound and the screen will blink showing the alarm conditions. The alarm can be silenced by pressing the 'Esc' key. In addition, if the TV2, is auto downloading to a computer on the same LAN a text or email message can be sent when an alarm occurs.
Many of Two Dimensional Instrument's customers use an auto dialer
to call their cell phone if an alarm is triggered'. We offer several
different auto
dialers
that will dial multiple different numbers (i.e. phone, pager, cell)
and leave a message when triggered, although any auto dialer that can
be triggered with a dry contact relay will work equally well.
The auto dialer pictured here uses its own power supply and has its own battery backup although the battery is only a four hour battery. So in the event of a power failure you should ensure that theTV2 monitor's 'power out' alarm is activated so you will receive a call as soon as power is interrupted. An emergency battery for the auto dialer is also available which will continue to operate the dialer for 24 hours if wall power is missing.