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E <br />3.1 Introduction <br />Under normal conditions the gas sensor module does <br />not require operator or technician intervention. The <br />following are conditions under which the module re- <br />quires attention: <br />- Routine periodic calibration <br />- Sensor replacement on a planned schedule <br />or when <br />a sensor failure occurs. <br />- Periodic cleaning as necessary. <br />3.2 Alarms <br />Three alarm conditions are possible. These can be <br />detected visually at the optional Sierra Monitor con- <br />troller and at the module (externally on the 200X <br />Series or internally on the electronics board of the <br />20X Series). <br />Warm -Up Alarm <br />Oscillating (On/Off) contact closure and "red/ <br />green" visual indication when power is first con- <br />nected to the module, followed by a continuous <br />closure of approximately 2-60 minutes indicat- <br />ing warm-up. <br />Buzzer <br />Relay <br />Relay <br />Fail Safe <br />On/Off <br />Oscilating <br />Oscilating <br />Gas Alarm <br />Sustained contact closure and solid red light <br />(once the warm-up time is completed) indicat- <br />ing the presence of gas at, or above, the pre-set <br />alarm limit. <br />Table 2.1 <br />Buzzer <br />Relay <br />Relay <br />Fail Safe <br />On <br />Closed <br />Open <br />17struction Manual <br />Interrupted contact closure and "red/green" vi- <br />sual indication (once the warm-up time is com- <br />pleted) after unit has been in operation, indi- <br />cating either a failed sensor or calibration prob- <br />lems. <br />Buzzer <br />Relay <br />Relay <br />Fail Safe <br />On/Off <br />Oscilating <br />Oscilating <br />20X/200X Gas Sensor Module (08/04) Page: 4 <br />