Knick SensoGate WA131MH, Руководство пользователя

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SensoGate WA131MH
19
2.7.2 Limit Switch
Note: The limit switch is only available on versions of SensoGate WA131MH with electronic limit
signal.
➜
Product Code, p. 11
The limit switch (1) is a “simple apparatus” as defined in EN 60079-11 for use in explosive atmospheres
up to Zone 0.
The limit switch (1) includes two reed switches (normally-open contacts), each of which is protected
by a 30 Ω series resistor.
Note: Reed switches are sensitive to transient overruns of the limit values (e.g., due to cable capaci-
tance or inductance).
The limit switch (1) has the following characteristics:
• Need not be marked according to EN 60079
• For connection to intrinsically safe circuits only
• Connection and ambient conditions:
◦ U
i
= 30 V
◦
I
i
= 100 mA
◦
P
i
= 750 mW
◦ C
i
= negligibly low
◦ L
i
= negligibly low
Temperature class T6 T6 T5 T5
Equipment protection
level Ga Gb Ga Gb
Ambient temperature
range -10 °C ... +45 °C
14 °F … 113 °F
-10 °C ... +60 °C
14 °F … 140 °F
-10 °C ... +57 °C
14 °F … 134.6 °F
-10 °C ... +70 °C
14 °F … 158 °F
• Isolation voltage: 500 V AC between housing and terminals
• When installed, its stainless steel housing is grounded via the SensoGate WA131MH.
• Verify the intrinsic safety before connecting the limit switch (1) to an intrinsically safe circuit.
• M12 connector to EN 60947, 4-pole
4
3
1 2
1
1
4
3
30 Ω
2
30 Ω
M12
PROCESS
SERVICE