Rosemount™ 248 Temperature Transmitter Specifications
1. Input Signals
- Supported sensors: 2/3/4-wire RTD, all standard thermocouples (J, K, T, E, N, S, R, B), mV, ohm resistance input
- Single channel input only
- Sensor wire break detection built-in
2. Performance
- Reference accuracy: ±0.05% of span + sensor matching error
- Turndown ratio up to 100:1
- Long-term stability: ≤ ±0.03% span drift per year
- Response time: Fast update rate for dynamic temperature changes
3. Output & Communication
- Standard output: 4–20 mA analog signal
- Digital protocol: HART 7
- Load resistance: Max 1050 Ω at 24 V DC supply
- Optional local LCD display for temperature, % span and fault status
4. Power Supply
- Operating voltage range: 11.9 V DC to 42.4 V DC loop power
5. Mechanical & Enclosure
- Form factor: Compact head-mount design, fits standard thermowell connection heads
- Terminal material: Standard tin-plated copper; optional corrosion-resistant alloy terminals
- Ingress protection: IP66
- Ambient operating temperature: -40 °C to +85 °C
6. Diagnostics
- Continuous sensor fault monitoring: open circuit, short circuit, out-of-range signal
- Digital diagnostic alerts accessible via HART communicator or asset management software
- Over-range and under-range indication
7. Safety & Certifications
- Global hazardous area approvals: ATEX, IECEx, FM, CSA intrinsic safety
- Compliant with electromagnetic compatibility (EMC) industrial standards
- Non-incendive certification available for Division 2 / Zone 2 sites
8. Configuration
- Configurable via HART handheld communicator or Emerson asset management software
- User-adjustable measurement range, damping value, sensor type and fault alarm level
- Pre-scaling and engineering unit selection (°C, °F, K)
9. Environmental Compatibility
- Resists vibration and electromagnetic interference for outdoor and plant indoor installation
- Wide ambient temperature tolerance for furnace, pipeline and utility temperature monitoring applications
Rosemount™ 248 Temperature Transmitter Combined Selection Table
| Code Group | Option Code | Description | Remarks |
|---|
| Base Model (Transmitter Type) | 248H | Head‑mount (Install inside sensor connection head) ★ | Field sensor integrated installation |
| 248R | DIN‑rail mount | Cabinet / junction box DIN rail mounting |
| 248D | Wireless field‑mount | Wireless temperature measurement, no signal wiring |
| Output Protocol | A | 4‑20 mA + HART® 7 ★ | For 248H / 248R |
| X | Wireless output | Only valid for model 248D |
| Sensor Input | R | RTD (Pt100/Pt200/Pt500/Pt1000, 2/3/4‑wire) ★ | ‑200 ~ +850 ℃ |
| T | Thermocouple (J,K,E,T,N,S,B,R) ★ | ‑270 ~ +1820 ℃ |
| O | Resistance (Ohm) input | 0‑2000 Ω |
| M | Millivolt (mV) input | ‑10 ~ 100 mV |
| Enclosure Housing | A | Connection head ★ | Aluminum, IP66/IP68 |
| B | BUZ head | Aluminum, IP65 |
| C | BUZ head | Polypropylene, IP65 |
| G | Connection head | 316SS stainless steel, IP66/IP68 |
| U | Universal junction box ★ | Aluminum, IP66/IP68 |
| J | 3‑entry universal junction box | Aluminum, IP66/IP68 |
| K | 3‑entry universal junction box | 316SS stainless steel, IP66/IP68 |
| N | No enclosure | ‑ |
| Conduit Thread | 2 | 1/2‑in NPT ★ | Common industrial thread |
| 1 | M20×1.5 | Metric thread |
| Hazardous‑Area Certification | NA | No approval ★ | Non‑hazardous area |
| I1 | ATEX Intrinsic Safety | Explosive zone application |
| E1 | ATEX Flameproof | Explosive zone application |
| I7 | IECEx Intrinsic Safety | Explosive zone application |
| E7 | IECEx Flameproof & Dust‑ignition proof | Explosive zone application |
| I5 | FM Intrinsic Safety, Class I Div2 | North‑American certification |
| K5 | FM Intrinsic Safety + Explosion‑proof | North‑American certification |
| Accessories | B5 | L‑shape pipe mounting bracket, SST | Field pipe mounting for junction box |
| RK | DIN‑rail mounting clip | Convert 248H for DIN‑rail installation |
Sample Order Code：248H A R A 2 I1 248H head‑mount transmitter｜4‑20mA HART output｜RTD input｜Aluminum connection head｜1/2‑in NPT thread｜ATEX Intrinsic Safety certification
Key Quick Spec
- Input: RTD / Thermocouple / Ohm / mV
- Accuracy: RTD ±0.2 ℃ typical；TC ±0.5 ℃ typical
- Power supply: 7.5‑42.4 VDC
- Diagnostics: Sensor break / short‑circuit detection, device health monitoring
The Rosemount 248 head-mount temperature transmitter is widely used for precise temperature monitoring and closed-loop control across all mainstream industrial sectors. It matches with RTD and thermocouple sensors installed on pipelines, reactors, storage tanks and heat exchangers to deliver stable 4–20mA HART signals to DCS and PLC systems.
In chemical and petrochemical plants, it monitors reaction temperature, distillation column temperature and medium temperature of heat exchangers, supporting batch production regulation and abnormal over-temperature protection. Its built-in sensor fault diagnosis effectively avoids unexpected shutdowns caused by broken thermocouple or RTD wiring.
For power generation facilities, the transmitter tracks boiler flue gas, feed water, turbine auxiliary pipeline and cooling system temperature. The compact size allows easy installation inside standard sensor connection heads on dense pipeline layouts in power houses.
Oil & gas upstream and downstream sites adopt this transmitter for temperature measurement on crude oil pipelines, storage tanks, separation vessels and steam injection pipelines. Global intrinsic safety certifications enable safe operation in flammable and explosive hazardous areas such as refineries and offshore auxiliary equipment.
Food, beverage and pharmaceutical production lines rely on the Rosemount 248 to control sterilization, fermentation and heating process temperature. Accurate and repeatable measurement helps manufacturers meet strict industry quality compliance standards for batch consistency.
Water treatment, pulp & paper and district heating systems also deploy this device. It monitors hot water, steam and process liquid temperature for energy consumption statistics, heat balance calculation and equipment protection. The wide ambient temperature tolerance and strong anti-interference performance make it suitable for both indoor workshops and outdoor field installations.
. DIN B style head mount transmitter
complete point temperature solution, delivering an installation-ready transmitter and sensor assembly
The Rosemount 248 has a standard transmitter design that provides flexible and reliable performance in process environments.
The Rosemount 248 has a standard transmitter design that provides
