Jesco GW 702, Руководство по эксплуатации

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20 | Operating Manual GW 702 | Relays
10. Relays
With three relays external devices can be controlled or information can be forwarded.
• Two limit values / alarm thresholds can be set per sensor.
• On reaching limit value 1, of sensor 1 or sensor 2, relay 1 is switched. This is not self-locking and
returns when the level falls below limit 1 again.
• On reaching limit value 2, of sensor 1 or sensor 2, relay 2 is switched. This is self-locking and does not
return when the level falls below limit 2 again.
• Relay 3 (Alarm) can be assigned to all four limit values at the same time: Limit value 1 and 2 of sensor
1 and of sensor 2. In the standard setting the limit values 2 of sensor 1 and sensor 2 are switched on.
The limits are pre-set depending on the model, see table 8.1.
NOTE!
CODE 86 is necessary for changes to the parameters and settings.
Limit Value Chlorine gas Chlorine dioxide Ozone
1 2 ppm 0.2 ppm 0.2 ppm
2 9.5 ppm 1 ppm 1 ppm
Tab. 10.1: Preset limit values for each measuring gas
Relay Limit value Delay time Self-
locking
Acknowledgement Use
Relay 1 1 No delay No Can be manually acknowl-
edged immediately Optical signal generator
Relay 2 2 Yes Can be acknowledged
immediately externally via
digital input.
Can only be acknowledged
manually when the level falls
below limit 2. Sprinkler with acknowl-
edgement via door
contact.
Relay 3
"Alarm" -, 1 or 2
(Standard: 2) No Can be manually acknowl-
edged immediately Acoustic signal
generator
Tab. 10.2: GW 702 measurement amplifier relays
Example
If relay 2 activates the sprinkler, and a door contact is connected to the digital input, then in case of alarm
the sprinkler will be switched off as soon as the maintenance personnel enters the room. The display shows
“Door Contact”. If limit value 2 is still exceeded when the door is closed, relay 2 switches again.
10.1 Action in the event of an alarm or fault
Limit value 1
When limit value 1 is exceeded there is a minimum gas concentration present. Appropriate action must be
taken immediately.
CAUTION!
Repair work may only be started when the concentration has dropped below limit value 1.
Limit value 2
When limit value 1 is exceeded the endangered area and all surrounding rooms must be evacuated. The
actions listed in the health and safety regulations and chlorine alarm plans must be taken. If a limit value is
exceeded, the message "Limit value exceeded" appears in the display.