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General
The Rosemount 248HAE5A2NSQ4 is a DIN B head-mount temperature transmitter from Emerson, designed for reliable single-point temperature measurement in industrial process applications. It converts compatible temperature sensor signals into a 4–20 mA output with HART digital communication for integration with process control and monitoring systems.

This configuration includes USA explosion-proof certification (E5), an aluminium connection head with IP66/68 protection, and a ½-in. NPT conduit entry. It is supplied without a temperature sensor (NS) and includes a three-point calibration certificate (Q4), making it suitable for installations where the sensor is specified and supplied separately.

Features
- DIN B head-mount temperature transmitter.
- 4–20 mA analogue output with HART digital communication.
- USA explosion-proof certification (E5).
- Aluminium connection head with IP66/68 protection.
- ½-in. NPT conduit entry.
- Supplied without a temperature sensor.
- Supports RTD, thermocouple, resistance, potentiometer and millivolt inputs.
- Single-sensor measurement capability.
- Open- and short-sensor diagnostics.
- Transmitter-sensor matching using Callendar–Van Dusen constants.
- Three-point calibration certificate included.
- Suitable for industrial process temperature monitoring.

Key Specifications
- Brand: Rosemount
- Manufacturer: Emerson
- Model: 248
- Manufacturer Part Number: 248HAE5A2NSQ4
- 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: ½-in. NPT
- Sensor Assembly Option: NS – No sensor
- Calibration Certificate: Q4 – Three-point calibration
- 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
- 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: Tested to 500 V AC RMS

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