ENMET SPECTRUM CO-RAL - Manual (Page 7)

S PECTRUM CO RAL ENMET Corporation
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3.1.1 Turn ON and OFF
Turn the instrument ON by pressing the POWER / BACKLIGHT pushbutton. the display should read "0000" within ten
seconds when the monitor is supplied with uncontaminated air.
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.
3.1.2 Gas Concentration Display and Alarms
The LCD furnishes a numerical display of CO concentration from 0000 to 100 ppm; this is the operational display. If the CO
concentration exceeds 100 ppm, the display reads "100+." When the concentration of CO exceeds the preset alarm point, the
audio and visual alarms are activated. The gas concentration continues to be displayed during alarm. The alarm point is
adjustable between 5 and 100 ppm CO by accessing the maintenance menu; the factory setting of the alarm point is 10 ppm CO,
the value recognized by OSHA as the acceptable exposure limit for compressed air lines. A user should have a justifiable
application-based reason for setting the alarm point higher than 10 ppm. When the CO 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 switch 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.
3.1.3 Alarm Acknowledge
When the instrument is in alarm, and the CO concentration is below 50 ppm, the alarm can be acknowledged by pressing and
releasing the
SELECT pushbutton, but only when the instrument is in the operational display location of the operational menu.
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 50 ppm does not result in
audio alarm cessation, and if the gas concentration rises above 50 ppm during an alarm condition which has been
acknowledged, the audio alarm resumes operation.
3.1.4 Data
The S PECTRUM CO RAL monitor retains the maximum and minimum gas concentration values encountered since turn-on, or
since the data was cleared and reset. There is a one minute delay from the time the instrument is turned on until when it starts
storing the information. To access this press the
OPTION switch three times; "see DATA" is displayed. Press the SELECT
switch; the maximum concentration since turn-on or last reset is displayed. Press the OPTION switch again; the minimum
concentration since turn-on or last reset is displayed. Press the OPTION switch again; "clr DATA" is displayed. Pushing the
SELECT switch clears the data and resets it to the current concentration.
Pushing the OPTION switch once more results in a display of both the countdown to the confidence beep and the internal
temperature of the instrument in degrees centigrade. Push the OPTION switch three more times to return to the operational
display.
3.1.5 Backlight
To backlight the display for observation in a dark area, press and quickly release the POWER / BACKLIGHT pushbutton. The
LCD backlight comes ON for a period of 45 seconds and then turns OFF automatically. The backlight can be turned off sooner
than 45 seconds by pressing the
POWER / BACKLIGHT pushbutton a second time. Use the backlight feature sparingly; it is a
relatively high energy user, and extensive use rapidly depletes the battery.
3.1.6 Low Battery Alarm
The battery status display is accessed by pressing the OPTION pushbutton once. When this display is "Batt=OK", the battery
energy level is sufficient for operation of the instrument. In this condition, the confidence beep occurs every thirty seconds
when the instrument is not in alarm.
When the battery energy level drops below the critically low point, the instrument automatically shuts off, and cannot be used
until the battery is replaced. See Section 4.2.2 for battery removal and replacement.