Sierra Monitor Corporation 2050-00, 2060-00, 2060-10, 2050-10 manual Warm-Up Alarm

Instruction Manual

3.0OPERATION

3.1Introduction

Under normal conditions the gas sensor module does not require operator or technician intervention. The following are conditions under which the module re- quires attention:

-Routine periodic calibration

-Sensor replacement on a planned schedule or when a sensor failure occurs.

-Periodic cleaning as necessary.

3.2Alarms

Three alarm conditions are possible. These can be detected visually at the optional Sierra Monitor con- troller and at the module.

Warm-Up Alarm

Oscillating (On/Off) contact closure and “red/ green” visual indication when power is first con- nected to the module, followed by a continuous closure of approximately 2-60 minutes indicat- ing warm-up.

Buzzer	Relay	Relay
		Fail Safe
On/Off	Oscilating	Oscilating
Gas Alarm

Sustained contact closure and solid red light (once the warm-up time is completed) indicat- ing the presence of gas at, or above, the pre-set alarm limit.

Table 2.1

Buzzer	Relay	Relay
		Fail Safe
On	Closed	Open

Trouble Alarm

Interrupted contact closure and “red/green” vi- sual indication (once the warm-up time is com- pleted) after unit has been in operation, indicat- ing either a failed sensor or calibration problems.

Buzzer	Relay	Relay
		Fail Safe
On/Off	Oscilating	Oscilating
3.3 Outputs

For the non-relay configurations a 5 volt DC TTL signal is provided to activate remote alarms such as the Sierra Monitor Alarm Panels. Relay configu- ration alarm conditions described above are trans- mitted to the annunciator as relay contact closures from the monitor.

The alarm outputs are non-latching closed contacts. As soon as the gas concentration falls below the alarm set-point, the alarm will stop and the alarm output will cause the relay to de-energize and the contacts will open.

During warm-up and failed sensor alarms the re- lays contact and the display LED's oscillate at ap- proximately one hertz.

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2050/2060 Gas Monitors (5/04)