ENMET SPECTRUM-RAL-DC - Manual (Page 9)

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2.1.1.2 Air Supply
If the model without a regulator is ordered, supply air at approximately 20 PSIG at a flow rate of
approximately 1.0 SCFH. If the regulator is supplied, the male quick disconnect pneumatic connector
on the regulator-flowmeter assembly is a Milton 1000 series. Plumb the associated female connector
into the air line. Connect the regulator-flowmeter and set the pressure at approximately 20 PSIG, and the
flow at 1.0 SCFH.
2.1.1.3 Turn On / Turn Off
To turn on, press and release the POWER/BACKLIGHT pushbutton switch. The display should read
"0000" within ten seconds when the monitor is supplied with uncontaminated air. To turn off, press the
POWER/BACKLIGHT bushbutton switch for three seconds.
2.1.2 Operational Menu
The operational menu diagram is shown in Figure 2. This menu is accessed with the OPTION
pushbutton switch, the middle switch as viewed from the front of the instrument. Successive displays are
achieved by repeatedly pushing the switch, as indicated by "O" in the menu flow diagram. The alarm
acknowledgement function, and displays and functions in the "see DATA" area, are accessed with
SELECT pushbutton, indicated by "S" in the menu diagram.
2.1.3 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.
2.1.4 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.