Cardinal Gates 948A-50 Automobile Alarm User Manual


 
3-1
Section 3
Operation
3.1 Operation
Since the operation and theory for the 948A-40 is identical to the 948A-50 with the exception that the 948A-40 has
no meter, only the 948A-50 will be discussed.
Once installation has been completed, operation of the VICTOREEN 948A-50 Remote Alarm/Meter is automatic and
does not require operator attention.
The analog meter continuously indicates the level of radioactivity measured at the detector site from 0.1 to 10
7
mR/h.
The light and Sonalert are actuated only when the radiation level at the detector site exceeds the high alarm set point
established at the ratemeter.
When an alarm condition occurs, the 12 VDC output from the detector preamplifier energizes causing the Sonalert
audible alarm to sound and the alarm lamp to illuminate STEADY ON.
The audible alarm can be silenced by pressing the "silence" pushbutton on the front panel, causing the Sonalert to
de-activate and the light to remain illuminated. An alarm condition cannot be canceled locally. The Sonalert and light
are automatically de-actuated when the alarm is acknowledged from the digital ratementer.
3.2 Theory of Operation
This section contains the theory of operation for the 948A-50.
During a high alarm condition, the light will illuminate and the Sonalert will sound. A silence button, located on the
front of the local/alarm meter, is provided to enable the operator to silence the Sonalert.
When a high alarm condition occurs, a 12 VDC input is introduced to the alarm circuit. This signal will cause the light
to illuminate. This 12 VDC input is also applied, via a normally closed contact of relay K1, to the Sonalert, energizing it.
To turn off the Sonalert, the silence pushbutton on the front panel may be depressed. This will cause the normally
closed contacts of relay K1 to open, which in turn de-energizes the Sonalert.
When the system returns to a normal operating level of radiation, the remote alarm/meter will return the relay to the
normal operating position.
When the alarm is powered from the preamplifier 12 VDC output, acknowledging the alarm from the digital
ratementer, will turn the 12 VDC input off, turning the audible alarm and the visual alarm off.