About the transmitter

The ST 3000 Smart Transmitter comes in a variety of models for measurement applications involving one of these basic types of pressure:
• Differential Pressure
• Gauge Pressure
• Absolute Pressure
The transmitter measures the process pressure and transmits an output signal proportional to the measured variable over a 4 to 20 milliampere, two-wire loop. Its major components are an electronics housing and a meter body as shown in Figure 1 for a typical differential pressure model transmitter

Functional block diagram

Besides the process variable (PV) output, the transmitter also provides its meter body temperature as a secondary variable (SV) which is only available as a read-only parameter through the communicator interface. See Figure 2.

Series and model number data

Honeywell’s line of ST 3000 Smart Transmitters includes these two series designations:

• Series 100      • Series 900

Each series includes several models to meet various process pressure measurement and interface requirements. Each transmitter comes with a nameplate located on the top of the electronics housing that lists its given “model number”. The model number format consists of a Key Number with several Table selections as shown below.

You can quickly identify what series and basic type of transmitter you have from the third and fourth digits in the key number. The letter in the third digit represents one of these basic transmitter types:
A = Absolute Pressure
D = Differential Pressure
F = Flange Mounted
G = Gauge Pressure
R = Remote Seals
The number in the fourth digit matches the first digit in the transmitter Series. Thus, a “1” means the
transmitter is a Series 100 and a “9” is a Series 900. For a complete breakdown of the Table selections in your model number, please refer to the appropriate Specification and Model Selection Guide that is provided as a separate document.

Considerations for HART communicator
Guidelines

When using the communicator to communicate with the transmitter:
• Be sure the power supply voltage does not exceed 42 Vdc (30 Vdc for intrinsically safe loops).
• Be sure there is at least 250 ohms of resistance between the communicator and the power supply for proper communication.
• Refer to communicator product manual for such information as operating limits.
Considerations for Local Smart Meter Option
If your transmitter is to be installed and operated with one of the integral smart meter options, please note the Smart meter specifications and operating conditions for the meter located in Appendix A of this manual

 

Links