Precautions

READ AND UNDERSTAND the Safety section.

  • An authorized technician shall verify that the installation and use of this product is in accordance to the manufacturer’s instructions, recommendations and intended use.

  • Although the SDM‑SIO2R is rugged, it should be handled as a precision scientific instrument.

  • There are no user serviceable parts. Changes or modifications to this device not expressly approved by Campbell Scientific may result in damaged equipment or loss of data.

  • The SDM‑SIO2R has not been approved to be operated in hazardous locations as defined by the National Fire Protection Association (NFPA) 70®, National Electric Code® (NEC).

  • WARNING: Ensure that the 12V power supply for the module is switched off when connecting the power and ground wires to the SDM‑SIO2R. When making connections to a data logger, always ensure power to the data logger is switched off and connect the ground (G) wire first.

  • WARNING: The RS-485 0V ground reference connection may be needed to ensure all units are referenced to a common ground voltage. This is more often needed with long cable runs. It is advisable to check the difference in ground potential with some caution before connecting any wires, to ensure the potential differences are reasonably small and excessive current will not flow between the two ground wires. There is a current limiting resistor fitted in the RG line in the SDM‑SIO2R, but this will not be adequate in the event of a serious ground fault, for example, the ground references being 240 V apart due to faulty AC wiring. If a large potential difference is found, please seek the advice of a qualified electrician before continuing with the installation

  • CAUTION: The power ground connection should be made with large gauge wire, (for example, 16 AWG or 1.5 mm2) to provide a low impedance path to ground allowing full protection from static and electrical transients.

  • CAUTION: The SDM‑SIO2R is considered to be a component of a measurement system that is installed in an enclosure and wired in accordance with this manual. Due to space considerations, full details of the maximum ratings of the connections are not given on the device. Instead the user should study this manual, and in particular Voltage specifications, to determine the maximum voltages that are applicable to any terminal before starting an installation.

Symbols used on the SDM‑SIO2R

Symbol

Description

Earth (ground) terminal, see Mounting.

Caution, see Installation and Safety.