ENMET MEDAIR 2200 - Manual (Page 12)

M ED A IR 2200 ENMET Corporation
9
4.0 Operation
4.1 Normal Operation Condition
With the M ED A IR 2200 installed as described in Section 3, and in clean air, the POWER green LED is on, the display
is lit and the information on the display is as shown in Figure 4 Display, for the sensor(s) installed in the M ED A IR
2200. The red alarm and fault LEDs are not lit.
Example of display with CO(ch 1), Dew Point((ch 2), Oxygen(ch 3) and CO
2
(ch 4)options installed
Figure 4: M ED A IR 2200 Operational Display
4.2 Alarm Set Points
There are two alarm set points for each installed channel of the M ED A IR 2200 . The factory settings of these alarm set
points are shown in Table 3.
Table 3: Typical Factory Alarm Set Points
Typical Channel # Gas Alarm 1, Flashing LED Alarm 2, Steady LED
1 Carbon Monoxide 10 ppm 20 ppm
2 Dew point 35°Fahrenheit at 55 PSIG 50°Fahrenheit at 55 PSIG
3 Oxygen Deficiency 19.5 % by volume 23.5 % by volume
4 Carbon Dioxide 500 ppm 1000 ppm
4 or Hydrocarbon 5 ppm 10 ppm
These alarm set points can be changed within limits; see the maintenance section of this manual for the procedure.
If the CO concentration increases above that of the alarm set point, the associated red LED is lit, the associated
relay changes state, and the audio alarm is activated.
If the dew point increases above that of the alarm set point, the associated red LED is lit, the associated relay
changes state, and the audio alarm is activated.
If the oxygen content of the sample air decreases below the deficiency alarm set point, the associated red LED is
lit, the associated relay changes state, and the audio alarm is activated.
If the oxygen content of the sample air exceeds that of the abundance alarm set point, the associated red LED is lit,
the audio alarm is activated, and both the oxygen alarm relay and the oxygen high alarm relay change state.
The HC sensor can only detect and alarm to hydrocarbons with an Ionization Potential of less then 10.6 eV .
See Appendix B.
The HC sensor is broad range in nature and is unable to differentiate between different hydrocarbons.
The Alarm 1 differential value is the delay of the M ED A IR 2200 staying in alarm condition until after the measured
reading has returned past the alarm point by the differential value. Example: If the alarm set point is
Λ
10 and the
differential is 2, the M ED A IR 2200 will go into alarm at 10 and stay in alarm until the reading has dropped below 8.
CO
0
O2 20.9
DP -20 CO2 300
CO
PPM O
2
%
DEW
POINT
CO2
PPM