Quick Start Guide for Rosemount 1208C Level and Flow Transmitter

Quick Start Information

This guide provides essential instructions for the installation and setup of the Rosemount 1208C Level and Flow Transmitter. It is intended for qualified personnel only. Always refer to the full Reference Manual for detailed operational instructions and safety compliance.

Installing on a Tank

The transmitter can be mounted using a flange or an NPT threaded adapter. Ensure all safety precautions are followed, including disconnecting power before servicing.

Flange Mounting

1. Place a suitable gasket on the tank flange.
2. Position the flange over the gasket.
3. Tighten the bolts and nuts with sufficient torque.
4. Apply thread sealant to the transmitter threads (only for NPT threaded tank connections).
5. Install and hand-tighten the transmitter. Note that the gasket is required for the G threaded version only.

NPT Threaded Adapter Mounting

1. Apply thread sealant to the outer threads of the adapter.
2. Mount the threaded adapter onto the tank.
3. Apply thread sealant to the transmitter threads.
4. Install and hand-tighten the transmitter.

Electrical Connections

The transmitter uses an M12 male (A-coded) connector. Use 24-18 AWG (0.20-0.75 mm2) wire. Twisted pairs and shielded wiring are recommended for high EMI environments.

• Power Supply: 14-35 Vdc at the transmitter terminals.
• Internal Power Consumption: Less than 0.8 W in normal operation.
• Cable Shield Grounding: Must be continuously connected throughout the segment and connected to a good earth ground at the power supply end.
• Load Limitations: For HART communication, a minimum loop resistance of 250 Ohm is required.

Wiring Diagram

The M12 connector pin assignment is as follows:

• Pin 1 (Brown): L+ (24 V)
• Pin 2 (White): NC (Not connected)
• Pin 3 (Blue): L- (0 V)
• Pin 4 (Black): NC (Not connected)

Power Up

1. Verify that the power supply is disconnected.
2. Insert the M12 connector gently. Do not force it; ensure it is aligned properly.
3. Once fully inserted, turn the screw ring until tight.
4. Connect the power supply.

Configuration

The transmitter can be configured using FDI, DD, or DTM compliant systems.

• Software: Download the AMS Device Configurator at Emerson.com/AMSDeviceConfigurator.
• Drivers: Download the latest FDI/DD/DTM package at Emerson.com/DeviceInstallKits.
• Guided Setup: Navigate to Configure, then Guided Setup, then Initial Setup. Follow the on-screen instructions and use Verify Level to check measurements.