ENMET SPECTRUM SP - Manual (Page 7)

SPECTRUM SP Series ENMET Corporation
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2.1.2 Turn ON and OFF
Turn the instrument ON by pressing the POWER / BACKLIGHT pushbutton for two seconds. The pump will automatically
actuate. For most instruments, the display should read "0000" within ten seconds when the instrument is in uncontaminated air.
N OTE : Instruments using biased sensor, stabilization time is extended to 4 minutes. Complete stabilization may take as long as
1 hour. When instrument is turned on it may display XXXX + . If instrument has been off for an extended amount of
time it may be necessary to “cycle” (turn on and off) the instrument several times. See Table 1 Appendix A for
identification of biased sensors.
Turn the instrument OFF by pressing and holding the POWER / BACKLIGHT pushbutton for three seconds. The display
flashes "OFF" and then fades out after the pushbutton is released. The instrument can be turned OFF from any location in the
operational or maintenance menus.
2.1.3 Gas Concentration Display and Alarms
The LCD furnishes a numerical display of the target gas concentration from 0000 to the upper limit of the range, shown in
Table 1 Appendix A. The display of the target gas concentration is termed the "operational display". If the target gas
concentration exceeds the upper limit of the range, the display is the numerical upper limit and a plus sign, for
example,"0200+", for hydrogen sulfide. When the concentration of the target gas exceeds the alarm set point, the audio and
visual alarms are activated. The gas concentration continues to be displayed during alarm. The alarm point is adjustable
between a lower and upper alarm limit by accessing the maintenance menu; these and the factory setting of the alarm point are
also given in Table 1 Appendix A. A user should have a justifiable application-based reason for setting the alarm point higher
than the factory setting. When the target gas concentration drops below the alarm point, the audio and visual alarms cease
operation. The alarm point setting can be observed on the display by pushing the
OPTION pushbutton twice.
If an alarm concentration is encountered when the display is at a location in the operational menu other than the operational
display, the audio and visual alarms are activated and the alarm cannot be acknowledged.
If the display is left idle at a location other than the operational display for 45 seconds it automatically transfers to the
operational display.
2.1.4 Alarm Acknowledge
When the instrument is in alarm, and the target gas concentration is below the upper alarm limit, the alarm can be
acknowledged by pressing and releasing the
SELECT pushbutton, but only when the instrument is at the operational display.
The acknowledgement causes the temporary cessation of the audio alarm; the red LED continues to be ON. The audio alarm is
OFF for a period of four minutes, after which it is reactivated, if the gas concentration is still above the alarm point. The alarm
can again be acknowledged. However, acknowledgement of the alarm at gas concentrations above the upper alarm limit does
not result in audio alarm cessation, and if the gas concentration rises above the upper alarm limit during an alarm condition
which has been acknowledged, the audio alarm resumes operation.
The alarms are high energy users. The LED alone uses twice as much energy as the non-alarming instrument. Prolonged use of
the instrument while it is in the alarm condition causes a marked decrease in battery life.
2.1.5 Confidence Beep
During normal operation, with no alarm conditions, the audio and visual alarms are activated once every thirty seconds.