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General
The Rosemount 248HAI1N0NS is a DIN B head-mount temperature transmitter manufactured by Emerson under the Rosemount brand. Designed for single-point industrial temperature measurement, it converts signals from compatible temperature sensors into a two-wire 4–20 mA output with HART digital communication.

This configuration features ATEX Intrinsic Safety certification (I1), with no enclosure and no temperature sensor supplied. Its universal sensor input capability supports RTD, thermocouple, resistance, potentiometer and millivolt signals, making it suitable for integration into industrial process monitoring and control systems.

Features
- DIN B head-mount temperature transmitter design.
- 4–20 mA analogue 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.
- One-year stability rating for reduced maintenance requirements.
- Automatic self-calibration for reliable measurement performance.

Key Specifications
- Brand: Rosemount
- Manufacturer: Emerson
- Model: 248
- Manufacturer Part Number: 248HAI1N0NS
- 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: Not applicable – 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 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
- Transmitter Weight: Approximately 50 g

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