The Rosemount 148 temperature transmitter is a standard device that can be used with various types of sensor inputs and can be installed economically and efficiently, with measurement accuracy higher than direct-wired solutions. This transmitter can be configured for top mounting in DIN B style and offers various housing options. To achieve reliable performance in process environments, this device uses a 4 to 20 mA signal that is resistant to noise and compensates for ambient temperature.

Here are the key features of the Rosemount 248 Temperature Transmitter at a glance:

Universal Input Support: Handles a variety of sensors including RTDs (Pt100, Pt1000), thermocouples (J, K, T, etc.), millivolt, and resistance inputs.

Reliable Output Signal: Standardized 4–20 mA with HART protocol for seamless control system integration.

Galvanic Isolation: Provides up to 2.5 kV AC isolation for signal integrity and electrical safety.

SIL2 Certification: Meets IEC 61508 requirements for use in Safety Instrumented Systems (SIS).

Sensor Diagnostics: Includes open/short circuit detection, sensor burnout alerts, and ambient compensation.

Durable Construction: Operates reliably in ambient temperatures from –50 to +85 °C.

Compact Design: DIN Form B head-mountable layout compatible with a wide range of sensor housings.

Easy Configuration: Set up via HART communicator or asset management systems like AMS Device Manager.
 

Frequently Asked Questions – Rosemount 248

1. What types of sensors can the Rosemount 248 accept? 

It supports a wide range of inputs including RTDs (e.g., Pt100, Pt1000), thermocouples (J, K, T, etc.), millivolt, and resistance inputs.

2. Can I configure the transmitter without removing it from the process? 

Yes, configuration can be done via a HART communicator or AMS Device Manager without removing the transmitter from service.

3. Is the Rosemount 248 suitable for safety applications? 

Absolutely. It is SIL2 capable per IEC 61508, making it suitable for use in Safety Instrumented Systems (SIS).

4. What is the power requirement? 

It operates on a 12–42.4 VDC loop-powered supply.

5. Does it support sensor diagnostics? 

Yes, it includes open/short circuit detection, sensor burnout alerts, and ambient temperature compensation.

6. Can I order it without a sensor? 

Yes, the 248 can be ordered as a stand-alone transmitter or assembled with a sensor and thermowell.

7. What is the function of the “S/N” field in configuration? 

The Sensor Serial Number (S/N) field helps track sensor identity and calibration history.

8. What is the recommended load resistance for HART communication? 

Typically, 250 to 1100 ohms is required for proper HART communication.

9. Does it have an Active Calibrator Mode? 

Yes, but it must be disabled before returning the transmitter to service to ensure full diagnostics are active.