I purchased an isolator, and a resistor came with it. What is the resistor used for?

The D Series is DCS-supported signal conditioners, consisting of modular type signal converters with versatile I/O specifications and housing nest. JIS and EIA conformed mounting nests come with terminal blocks for field wiring, connectors for DCS connection, and connectors for communications.

F Series signal conditioners are compact, space-saving (24 mm width) signal conditioners with front panel terminals. The microprocessor based models provide field configuration capability and minimum stock of spares. The installation is either DIN-Rail, Rack or Wall mounting, and the power supply is 24 V DC.

M Series computing units include a type that supports user-specified programs, and types that support analog memory, peak/bottom holders, moving averages, dead times, temperature/pressure compensation, and a wide range of other applications.

M Series unified signal converters are plug-in type signal conditioners for common instrumentation signals. They have an I/O signal range of 4 to 20 mA DC or 1 to 5 V DC.

M Series signal conditioners are a plug-in type that can support a wide range of applications through a versatile I/O specifications. Plug-in type construction provides easy for instrumentation planning, field wiring and maintenance. Over 30 types of signal conditioners are lined up in M Series.

The VJ Series are compact, but the line-up includes versatile I/O specifications, wide-range of power supply, isolated two outputs and field configurable models.

The VJ series limit alarms are compact, plug-in type alarm setting devices with easy-to-use functions. Four models are available: the VJAK for 2-wire system transmitters; the VJHK with DC voltage/DC current inputs; the VJRK with RTD inputs; the VJTK with thermocouple inputs; and the VJUK with universal inputs.

Compact size, plug-in style and microprocessor based high performance capabilities (Multi-function types) makes the VJ Series Signal Conditioners an excellent choice for almost every application. Analog output, Hi-Low alarm relay outputs or RS-485 MODBUS communication is available as optional second output.

Compact size, versatile mounting, and microprocessor based high performance capabilities makes the W Series an excellent choice for almost every application. The specifications of W Series signal conditioners are as same as F Series signal conditioners except for power supply voltage, second output and case width.