Safety Precautions; Application; High Liquid Level Alarm - Sentry 110 Operating Manual

1. SAFETY PRECAUTIONS

The potential for electrical shock exists whenever water is present
near conductive electrical equipment. Check for sources of electricity
from other nearby devices before working on this equipment. There
is no possibility of serious shock from the energy levels used by this
alarm. The low voltage DC and transformer isolation provide safety
when handling or opening the enclosures or the probe. Best practice,
however, is to disconnect power when working on this equipment.

2. APPLICATION

The Sentry liquid level alarm continuously monitors a water level, rising
(high level) or falling (low level), that may cause an alarm condition.
Application examples are pump chambers, cisterns, holding tanks,
sumps, fl oor drains, irrigation channels or truck tanks. The alarm also
performs self-diagnostics, continuously testing that all components are
operating correctly. The battery powered outdoor probe communicates
with the indoor alarm display up to 90 m (300 feet) range. The indoor
alarm display will fl ash an LED and sound an audible alarm. Audio can
be muted with the pushbutton. When the alarm condition is corrected
the audio will reset.
• Green indicates power on and monitoring
• Red fl ashing and audio pulsing indicates an alarm condition
• Yellow or blue indicates an error in the wireless communication
or in the probe circuit
• Audio chirp warns of low batteries in the outdoor transmitter
See FIG 7 and section 4.1.

2.1 HIGH Liquid Level Alarm

HIGH LEVEL alarm condition occurs when the liquid level rises
to partially cover the pins on the bottom of the probe. An example
of rising water causing an alarm condition is a septic tank.
Model 110 Operating Manual
Sentry
Liquid Level Alarm
Page 3