Controls & Indicators
The high quality taut band meter provides a continuous
indication of the concentration of hazardous gas in the area. The
meter is divided into three separate zones of safety. The meter is
intended to register concentration levels relative to the
calibration point requested. The red zone indicates concentrations
of gas or vapor above the danger level. The unitís alarm and
calibration point is set to occur at the border of the red and the
yellow zones. When the needle enters the yellow or caution zone,
the SBG-200 is sensing gas or vapor concentrations within 20% of
the calibration alarm point.
Light and Sound Alarms
When the SBG-200 senses gas concentrations at or above, the
calibration point as represented by the red zone on the meter, the
red alarm light will flash and a high frequency sound alarm built
into the top of the unit will sound. The sound alarm emits a
pulsating shriek. In order to reduce false alarms, it has a built
in 12 second time delay after an alarm condition exists. If during
this 12 second period the gas concentration falls below the
critical level, the unit will not alarm.
Three Position Control
The black control switch on the front of the unit allows
control of three separate functions.
Stand-By: This function (the switch in its bottom
position) allows the user to monitor the atmosphere as indicated
by the meter, but cuts off all audible and visible alarms as well
as the relay. Stand-by should be used when the unit is being
stabilized to prevent false alarms. Stand-by can also be helpful
when checking the calibration of the unit or when cleaning up a
hazardous condition which is already known to exist.
Sensing: This middle position is the normal switch
position when the unit is in full operation.
This top position is a momentary setting which will
automatically move back to the sensing position. The reset
position is required to turn off the alarms and to restore the
relay to its normal setting. Without manually moving the switch
into reset, the alarm functions (if they are set for latching)
will remain latched in the event they should go on.
The SBG-200 comes with a high reliability relay circuit which
can be used to connect the monitor to a central alarm system, turn
on a remote alarm, or turn on a small emergency device. The relay
connection is located on the bottom of the unit. This relay does
not provide power, but instead acts as a switch to turn on
something which is already powered. This switch is rated to
withstand power up to 6.0 amps at 120 volts AC. A mating connector
is also provided which can be used to attach the relay to wires
running from the remote device.
The SBG-200 uses a solid state high reliability sensor which
is located either on the bottom portion of the unit enclosed in
the black housing or at the end of the optional sensor extension.
Under most conditions your sensor is sufficiently protected from
dust and other contaminants. It should give you trouble free
service for many years. Several sensors are available. When
monitoring particularly hazardous or corrosive environments or
locate the sensor at an alternate point, the SBG-200 is available
on an optional basis with the sensor mounted on a cable which can
be extended from the monitor up to a distance of 100 feet
depending upon the application. The sensor operates by diffusion.
It is very stable over time.
A green power light on the front of the unit indicates that
the unit is functioning when it is lighted.
The SBG-200 is provided with rubber feet so that it can be
conveniently moved from location to location. Screw slots are
provided on the back for permanent wall mounting