Johnson Matthey TRACERCO T401, User Manual, Page: 8 / 26

4 Operational Features
Owners should also refer to the Main Menu Structure for Functionality
4.1 Switch On
The monitor is activated by pressing the RED on / off switch. This switch has a toggle action
– press for
ON and press again for OFF
.
In the absence of any significant local radiation sources the meter will
register incident background radiation which will vary with geographical location. A typical background
reading on the monitor would be of the order of 0.5
– 1 count per second.
Please note that there may be a slight delay of one or two seconds between physically operating the
switch and the screen clearing of information.
4.2 Speaker
Pressing the GREY switch with the speaker symbol activates the internal speaker. The speaker provides
an audible clicking sound whose rate is proportionate to the amount of radiation registered by the
detector.
The speaker may be silenced by re -pressing the
GREY switch. The speaker symbol shows on
screen when the audible option has been selected. Battery life is extended with the speaker off.
4.3 Backlight
The monitor display is fitted with a backlight, which is available for use in situations of low ambient light
intensity. The
GREY switch with the sunburst symbol is pressed to activate the backlight facility. Since the
backlight significantly increases the current drain on the battery, the pushbutton switch is designed for
contact operation only ie., depressing the switch activates the backlight and releasing the switch cancels
the light.
4.4 Low Battery
The monitor is equipped to display a “LO BATT” message. Although it is recommended that the battery be
replaced as soon as this message is activated, it might be expected that under normal conditions, the
monitor is capable of operating for a further 4 hours.
4.5 Pre-Set Alarm
The monitor is equipped with an alarm function which the operator can pre -set, within prescribed
limits, to any desired level of counts per second (
cps ) or Bq/cm
2
. If an alarm level is set in the cps mode,
it will not be available when in the Bq/cm
2
mode (and vice versa). An alarm is a continuous high
frequency tone whenever the measured reading exceeds the pre-set value. The alarm may be
deactivated by the operator. There is no mute (accept facility) for the alarm. Alarm activation is indicated
by a flashing loudspeaker icon.