Instruction Manual

PT2E-1052
31
６．KINDS OF ALARM AND ITS FUNCTION
６−１．Kinds of alarms
There are two kinds of gas alarm and trouble alarm.
Gas alarm : When the detection gas reaches to preset alarm level or exceeds it, this starts
to function. 《Non-latched mode》
* Trouble alarm : Trouble is detected in the detector and it gives an alarm as trouble alarm.
Except system trouble “E-00”, it is non-latched. When return to normal from
trouble condition, it starts again from the performance ≪Initial clear≫ after
power on. [See “8. TREATMENT AT ABNORMAL CASE”]
６−２．Gas alarm
６−２−１．Gas alarm action
(1)Display
①Gas concentration display
When exceed detection range, LED display shows “∩∩∩∩”.
②Power light (POWER : Green)
It keeps continuous lighting.
③Alarm light (ALM1 : Orange), (ALM2 : Red)
There are two alarm levels. When the reading goes to alarm preset level or
exceeds it, this turns to on.
(2)External output
①4∼20mA output
Electric current in proportion to gas concentration is output. In case of over scale,
the maximum output is approx 22mA
②Alarm contact
When gas concentration reaches preset alarm level or exceeds it, the relay
contact for outer alarm works.
Relay contact is a non-latched condition. It returns automatically when gas
concentration decreases under preset alarm level.
Alarm delay time(6 sec.)
Alarm delay time(6 sec.)
Alarm light(ALM 1)
Alarm contact
(
Terminal 7
，
8
)
Alarm ｌight（ALM 2）
Alarm contact
(
Terminal 9
，
10
)
ALM2 Alarm level
ALM1 Alarm level
Concentration
＊ NOTE
Alarm levels are adjusted at 1/3(1st alarm) and 2/3 (2nd alarm) of full scale as
standard.
To prevent error of performance, this is provided with 6 second alarm delay time.