sewerin VARIOTEC 480 EX - Page 85

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7 Appendix
AL4
Type: Warning of gas concentration in ppm range
Adjustable: Ye s
Latching: No
Trigger: Alarm threshold AL4 exceeded
Indicator: – Audible signal
– Visual signal
– AL4 notication on display
Acknowledge-
ment:
– Possible for audible signal when alarm threshold
AL4 is exceeded
Reset: – Automatically when level falls below alarm threshold
AL4
STEL
Type: Main alarm (short-time exposure limit)
Adjustable: No
Latching: Yes
Trigger: Sum of the concentrations of a gas is greater than
the product of the OEL and the excess factor over the
averaging time
Indicator: – Audible signal
– Visual signal
– STEL message on display
Acknowledge-
ment:
– Not possible
Reset: – By changing to another application
– By switching device o󰀨
LTEL
Type: Main alarm (long-time exposure limit)
Adjustable: No
Latching: Yes
Trigger: Sum of the concentrations of a gas is greater than the
OEL over the averaging time
Indicator: – Audible signal
– Visual signal
– LTEL message on display
Acknowledge-
ment:
– Not possible
Reset: – By changing to another application
– By switching device o󰀨