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The Rosemount 3100 series are transmitters that operate on a two-wire circuit and can accept the following power supplies: 3101: 12 to 30 Vdc; 3102: 12 to 40 Vdc; 3105: 12 to 40 Vdc (for non-hazardous areas), 12 to 30 Vdc (for hazardous areas). Important note: To meet CSA certification requirements, the 3101 and 3102 models must be powered by a Rosemount 3490 series control unit or by a Class 2 independent extra-low voltage (SELV) power supply. If the transmitter is connected to a multi-point connection system while the circuit is live, other devices may be reset. The circuit should be powered off to prevent the device from resetting. Each transmitter comes with two cable entrances. An appropriate conduit system or cable gland must be used to maintain the weatherproofing rating and protection performance in hazardous areas. Any cable entries that are not in use must be sealed with plugs of appropriate grade. For external power supply and output signal connections, a two-core insulated/shielded cable is required. The cable is not provided. Installation in hazardous locations (applicable only to Rosemount 3105). When the 3105 is used in combination with Rosemount 3490 series control units, no additional safety barrier is required. If power is supplied to 3105 from any other source, an appropriate intrinsically safe barrier must be installed in the non-hazardous (safe) area. The selection of the safety barrier should ensure that its output parameters Uo, Io, and Po are lower than the transmitter’s Ui, Ii, and Pi. Intrinsic safety parameters: Ui = 30 V, li = 120 mA, Pi = 0.82 W, Li = 108 mH, Ci = 0 nF. The total capacitance and total inductance of the transmitter and the connection cables must not exceed the maximum values specified for the selected safety barrier. Connect the cable to the transmitter. 1. Make sure the power is turned off. 2. Unscrew the three housing cover screws, then lift the transmitter housing cover. The lid on the metal casing can rest on the hinge. Place an object under the cover to prevent the transmitter from tipping over. 3. Pass the cable through the cable seal/guide tube. 4. Connecting cable cores: a. For 3101, the cores should be connected as shown in Figure 1. b. For 3102, the core wires should be connected as shown in Figure 2. c. For 3105, the core wires shall be connected as shown in Figure 3. 5. Connect the cable jacket/shield to an appropriate ground point (ground) at only one end. 6. Put the cover back on, tighten the cable gland, and connect to the power supply. Important note: 3101 and 3102 are not intrinsically safe and can only be used in non-hazardous (ordinary) locations. If HART communication is required (available on 3102 and 3105), a load resistor of 250 ohms (minimum) and 0.25 W must be installed in the loop. This resistor is not required when using 3102 or 3105 transmitters in conjunction with the Rosemount 3490 series control units. A. The maximum cable length is 3000 meters (9750 feet). B. Connect the cable jacket/shield to the ground point in the control room. C. Cable diameter: 04 to 8 millimeters (0.15 to 0.31 inches). D. Shielded twisted pair. Minimum size: 0.22 mm2 (24 SWG / 23 AWG) ； Maximum: 1.5 mm2 (16 SWG / 18 AWG) E. The voltage on the transmitter must be at least 12Vdc for it to function. A. The maximum cable length is 3000 meters (9750 feet). B. Connect the cable jacket/shield to the ground point in the control room. C. Cable diameter: 04 to 8 millimeters (0.15 to 0.31 inches). D. Shielded twisted pair. Minimum size: 0.22 mm2 (24 SWG / 23 AWG) ； Maximum: 1.5 mm2 (16 SWG / 18 AWG) E. The voltage at the transmitter must be at least 12 Vdc for it to function. A. The maximum cable length is 3000 meters (9750 feet). B. Connect the cable jacket/shield to the ground point in the control room. C. Cable diameter: Ø4 to 8 millimeters (Ø0.15 to 0.31 inches). D. Shielded twisted pair. Minimum size: 0.22 mm2 (24 SWG / 23 AWG) ； Maximum: 1.5 mm2 (16 SWG / 18 AWG) E. The voltage at the transmitter must be at least 12 Vdc for it to function