ENMET MedAir 2000 - Manual (Page 13)

M ED A IR 2000 ENMET Corporation
9
4.4 Audio Defeat
With the alarms in the non-latching configuration, pressing the ALARM ACKN/AUDIO DEFEAT switch during an
alarm silences the audio alarm.
With an alarm in the latching configuration, pressing the ALARM ACKN/AUDIO DEFEAT switch during an alarm
silences the audio alarm and unlatches the associated relay(s).
4.5 Display
In clean air with the correct dew point, the display is as shown in Figure 4, for the sensor(s) installed in the M ED A IR
2000. This position of the display is termed the "operational display". As explained below, the display can be
changed to furnish other information by using the OPTION and SELECT switches.
Concentrations of CO are given in PPM (parts per million parts of air). Dew point is given in degrees Fahrenheit at 55
PSIG ; this can be changed to degrees Centigrade by pressing the SELECT switch. Oxygen concentration is given in
per cent by volume. When sample flow is reduced below a limit, the display switches from "Flow: yes" to" Flow: no",
or from "Flow: y" to "Flow: n".
4.6 Operational Menu
The operational menu allows the user to:
ƒ View alarm set point concentration values
ƒ View alarm latching configurations
ƒ Enter the maintenance menu with the proper key.
The operational menu is accessed with the OPTION and SELECT switches. The operational menu flow chart is
shown in Figure 5,
ƒ The OPTION switch is indicated with a "O"
ƒ The select switch is indicated with a "S".
If the instrument is left at any location in the operational or maintenance menus, other than the operational display,
with no action taken for a period of 45 seconds, it returns to the operational display.
Figure 5: M ED A IR 2000 Operation Menu Flow Chart
O
O
S
S
Operational Display
DEW POINT
°C ↔ °F
000 PPM 20.9%
037 °F FLOW:y
View
Alarms & Latches
O
S run Maintenance
Menu
To Key
O
S ppm CO: 10
Latch: Yes
No Function
O
°F DP: 39.0
Latch: Yes
S
No Function
S
O
%O
2
: 19.5 23.5
Latch: Yes Yes
No Function
O = Option Switch
S = Select Switch