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General
The Rosemount 248HAI1NONS is a DIN B head-mount temperature transmitter manufactured by Emerson. Designed for industrial temperature measurement, it converts signals from compatible temperature sensors into a two-wire 4–20 mA output with HART digital communication for integration with process control and monitoring systems.

This configuration features ATEX Intrinsic Safety certification (I1), with no enclosure and no temperature sensor included. Its universal sensor input supports RTD, thermocouple, resistance, potentiometer and millivolt signals, offering flexibility for a range of industrial temperature measurement applications.

Features
- DIN B head-mount temperature transmitter design.
- Two-wire 4–20 mA output with HART digital communication.
- ATEX Intrinsic Safety certification (I1).
- Supplied without an enclosure.
- Supplied without a temperature sensor.
- Universal input for RTD, thermocouple, resistance, potentiometer and millivolt signals.
- Single-sensor measurement capability.
- Open- and short-sensor diagnostics.
- 2.5 kVAC galvanic isolation capability.
- Transmitter-sensor matching using Callendar–Van Dusen constants.
- Automatic self-calibration.
- SIL 2 capability according to IEC 61508 certification.

Key Specifications
- Brand: Rosemount
- Manufacturer: Emerson
- Model: 248
- Manufacturer Part Number: 248HAI1NONS
- Product Type: Head-Mount Temperature Transmitter
- Transmitter Type: DIN B Head Mount
- Output Signal: Two-wire 4–20 mA with HART digital communication
- Sensor Input: RTD, thermocouple, resistance, potentiometer and bipolar millivolt
- Sensor Configuration: Single sensor
- Product Certification: I1 – ATEX Intrinsic Safety
- Enclosure: Not included
- Conduit Entry: No enclosure
- Sensor Assembly Option: NS – No sensor
- Power Supply: 12.0–42.4 V DC at transmitter terminals
- Minimum Supply Voltage: 17.75 V DC with 250 Ω load
- Operating 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: 500 V AC RMS tested
- Head-Mount Transmitter Weight: 50 g

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