4.2.2 Description of Major Components
An external view of the H201Ci-1 is presented in Figure 4-5 below.
Figure 4-5: External View of Hydran 201Ci-1
1. Digital Display: The LED digital read-out displays the content of combustible gas
in the oil. The standard range of the H201Ci-1 display is 0 to 1,999 ppm
(volume/volume). When the H201Ci-1 is linked to a Hydran 201Ti, the display
reflects the actual H201Ti’s reading. The display blanks when a system fault
occurs at the H201Ti level or in the H201Ci-1 itself.
2. Door-Mounted Alarm Indicators and Push-buttons: The two illuminated push-
buttons are mounted on the cabinet door of the instrument. Each local indicator
latches on when the corresponding gas alarm relay is energized. The indicator
remains on when the alarm relay turns off and it must be cleared (or
“acknowledged”) by pressing the illuminated indicator. The indicator clears only
when the corresponding gas alarm relay has de-energized.
3. Enclosure: The H201Ci-1 cabinet is rated Type NEMA 4X. With the standard
internal heater, the instrument operating temperature ranges from -40 to +55°C
(-40 to +131°F).
An internal view of the H201Ci-1 is presented in Figure 4-6 below.
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