Ametek Land 4750-PM, Руководство пользователя

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User Guide 4 - 10
Particulate Measurement System 4750-PM
4.5.6 RS485 Connection (CN7)
Referring to the wiring diagrams above (or in the sensor lid), route a suitable
cable through a vacant cable gland and connect to the RS485 connector
terminals.
Pin Connections (Top to Bottom)
Wire Colour
POWER IN
Connector
ISO GND
-B
+A
NOTE
The maximum cable length for RS485 is 1,000 m (0.6 mi / 3,300 ft
nominal).
4.5.7 Digital Input Connection
Referring to item 8, Fig. 4-2 (on page 4-8), route a suitable cable through a
vacant cable gland and connect to the Digital Input terminal. The maximum
voltage across input is 48 V, nominal 24 V. The maximum current allowed per
pin is 16 mA.
4.5.8 4-20mA Output Connections
Referring to item 6, Fig. 4-2 (on page 4-8), route a suitable cable through a
vacant cable gland and connect to the 4-20mA O/P terminal.
4.5.9 Alarm Contact Connections
The sensor is fitted with two voltage-free relays (SPCO). The relays can be
used to a maximum of 24 V DC nominal (18–36 V range), 0.5 A.
Referring to item 8, Fig. 4-2 (on page 4-8), route a suitable cable through a
vacant cable gland and connect to the Relay 1/Relay 2 terminals.