ENMET SPECTRUM-RAL - Manual (Page 8)

ENMET Corporation S PECTRUM RAL
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3.2 Gas Concentration Display and Alarms
The LCD furnishes a numerical display of CO concentration from 0000 to 100 PPM . 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
concentration numerical 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 concentration numerical display for 45 seconds it automatically
transfers to the concentration numerical display.
3.3 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 numerical concentration
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
P P M , 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.
3.4 Data
The SPECTRUM-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 gas
concentration numerical display.