YSI 6500 Environmental Process Monitor - Manual (Page 18)

Installation Section 2
Use the following precautions from UL 508 as a guide to safety for personnel and property.
¾ AC connections and grounding must be in compliance with UL 508 and/or local electrical
codes.
¾ The metal stiffener provides support and proper electrical continuity between conduit fittings.
¾ This type 4/4X enclosure requires a conduit hub or equivalent that provides watertight
connection, REF UL 508-26.10.
¾ Watertight fittings/hubs that comply with the requirements of UL 514B are to be used.
¾ Conduit hubs are to be connected to the conduit before the hub is connected to the enclosure,
REF UL 508.26.10.
¾ If the metal support plate is not used, plastic fittings must be used to prevent structural
damage to the Monitor. Also, the appropriate grounding lug and AWG conductor must be
used with the plastic fittings. When using plastic connectors and non-metallic liquid-tight
conduit note that the maximum conduit run length is 6 feet, REF NEC351-23-b3.
2.5.3 RELAY OUTPUT WIRING
The four (4) output relay connections are made to terminals 1 through 12 of TB-2. Relays may be
wired normally open (N.O.) or normally closed (N.C.). Use appropriate wire in terms of gauge
and insulation to adequately handle the voltage and current being switched by the relays. See
Appendix A, Specifications, for relay specifications. Do not use power at TB-1 as a source for
any of the relays in the 6500 system. Remember that relays are intended to activate alarms,
phone dialers and similar devices. The relays are not intended to switch heavy loads.
4-20 MA CURRENT LOOP OUTPUT WIRING
The eight (8) 4-20 mA current output connections are made to TB3-1 through TB3-16. Use
Belden cable #8164 (4-conductor), #8168 (8-conductor) or equivalent between the 6500 Monitor
and the SCADA or recorder site.
RS232 AND RS485 TERMINALS
The RS232 port is used for 6500 Monitor software updates and optional Modbus interface. The
RS485 port can also be used for an optional Modbus interface. Neither of these connectors is
involved in the installation of the 6500 system.
YSI Incorporated 6500 Environmental Process Monitor 14