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General
The Rosemount 248HAE5A1XA is a DIN B head-mount temperature transmitter designed for reliable temperature measurement in industrial process applications. It converts signals from compatible temperature sensors into a standard 4–20 mA output with HART digital communication, enabling integration with process control and monitoring systems.

This configuration includes USA explosion-proof certification (E5), an aluminium connection head with IP66/68 protection, and an M20 × 1.5 conduit entry. The XA assembly option allows a separately specified temperature sensor to be assembled with the transmitter, providing a convenient solution for industrial temperature measurement installations.

Features
- DIN B head-mount temperature transmitter design.
- 4–20 mA analogue output with HART digital communication.
- USA explosion-proof certification (E5).
- Aluminium connection head with IP66/68 protection rating.
- M20 × 1.5 conduit entry.
- Supports RTD, thermocouple, resistance, potentiometer and millivolt inputs.
- Single-sensor measurement capability.
- Open- and short-sensor diagnostics.
- 2.5 kVAC galvanic isolation capability.
- Transmitter-sensor matching using Callendar–Van Dusen constants.
- XA option for assembly with a separately specified temperature sensor.

Key Specifications
- Brand: Rosemount
- Manufacturer: Emerson
- Model: 248
- Manufacturer Part Number: 248HAE5A1XA
- Product Type: Head-Mount Temperature Transmitter
- Transmitter Type: DIN B Head Mount
- Output Signal: 4–20 mA with HART digital communication
- Sensor Input: RTD, thermocouple, resistance, potentiometer and millivolt
- Sensor Configuration: Single sensor
- Product Certification: E5 – USA Explosion-Proof
- Enclosure: Aluminium connection head
- Enclosure Protection: IP66/68
- Conduit Entry: M20 × 1.5 (CM20)
- Assembly Option: XA – Sensor specified separately and assembled to transmitter
- Power Supply: 12.0–42.4 V DC at transmitter terminals
- Minimum Supply Voltage: 17.75 V DC with 250 Ω load
- Operating Ambient Temperature: −40 to +85 °C (standard configuration)
- Humidity: 0–95% RH, non-condensing
- Update Rate: Less than 0.5 seconds
- Damping: 5 seconds default; adjustable up to 32 seconds
- Turn-On Time: Less than 5 seconds with zero damping
- Input/Output Isolation: 500 V AC RMS tested

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