Basic Info.
Product Name
Emerson Rosemount 248 Rail Mount Temperature Trans
Signal Types
4-20 Ma Hart® 7
Installation
DIN Rail (Ts35)
Safety Standards
ATEX/Iecex (Zone 2/22, Ex Na Iic T6 Gc), Sil 2 (Ie
Accessories
Wirelesshart Adapter, LCD Display Module, DIN Rail
Connection
Spring-Loaded Terminals with Screwless Clamping
Response Time
< 100 Ms (90% Step Change)
Power Supply
12–36 V DC (2-Wire) / 90–253 V AC
Electrical Isolation
1500 V AC (Input to Output)
Operating Temperature
-40°c to +85°c (-40°f to +185°f)
Vibration Resistance
5 G RMS (10–150 Hz)
Transport Package
Support Air/Land/Sea Transportation
Specification
35cm*30cm*30cm*
Product Description
Product Parameters
| Category | Parameter | Specification |
|---|
| General Information | Model Number | 248 |
| | Product Type | Rail Mount Temperature Transmitter |
| | Brand | Emerson (Rosemount) |
| | Origin | USA |
| Input | Sensor Types | Pt100, Pt1000 RTD; Thermocouples (Type J, K, T) |
| | Temperature Range | RTD: -50°C to +200°C (-58°F to +392°F)TC: -50°C to +400°C (Type K) |
| Output & Communication | Signal Types | 4-20 mA HART® 7 |
| | Protocol | HART® 7 (WirelessHART optional) |
| Accuracy | RTD Accuracy | ±0.15% of span |
| | Thermocouple Accuracy | ±0.5°C (±0.9°F) |
| | Long-Term Stability | ±0.02% per year |
| Power Supply | Voltage Range | 12-45 V DC |
| | Power Consumption | ≤20 mA |
| Environmental | Ambient Temperature Range | -40°C to +85°C (-40°F to +185°F) |
| | Process Temperature Range | -50°C to +200°C (RTD) / +400°C (TC) |
| | Enclosure Rating | IP66, NEMA 4X |
| Certifications | Safety Standards | ATEX/IECEx (Zone 2/22, Ex nA IIC T6 Gc), SIL 2 (IEC 61508/61511) |
| | Environmental Compliance | RoHS, REACH |
Product Description
Emerson Rosemount 248 Rail Mount Temperature Transmitter
Precision and Versatility in Industrial Temperature Monitoring
The Emerson Rosemount 248 Rail Mount Temperature Transmitter is a state-of-the-art device engineered to deliver reliable, high-accuracy temperature measurement in demanding industrial environments. Designed for seamless integration into control panels via DIN rail mounting, this transmitter bridges the gap between traditional analog systems and modern digital automation. With its compact design, rugged construction, and compliance with global safety standards, the Rosemount 248 is an ideal solution for industries such as oil and gas, chemical processing, HVAC, and power generation.
1. Core Technology and Operating Principle
The Rosemount 248 converts signals from resistance temperature detectors (RTDs) or thermocouples into a standardized 4-20 mA output with HART® 7 communication. Its microprocessor-based architecture employs advanced signal conditioning algorithms to eliminate noise, compensate for lead resistance, and ensure stable readings in electrically noisy environments.
Key Innovations:
- Dynamic Sensor Validation: Continuously monitors sensor integrity, detecting open circuits, short circuits, or degradation, and triggers alerts via HART® diagnostics.
- Adaptive Temperature Linearization: Automatically adjusts for non-linearities in RTD or thermocouple responses, maintaining accuracy across the full operating range (-50°C to +200°C for RTD).
- Non-Volatile Memory: Retains configuration settings during power interruptions, eliminating post-outage recalibration.
2. Technical Specifications
Measurement Performance
- Input Types: Supports Pt100, Pt1000 RTDs and thermocouples (Type J, K, T).
- Temperature Range:
- RTD: -50°C to +200°C (-58°F to +392°F).
- Thermocouple: -50°C to +400°C (-58°F to +752°F), depending on sensor type.
- Accuracy:
- RTD: ±0.15% of span.
- Thermocouple: ±0.5°C (±0.9°F).
- Long-Term Stability: ±0.02% per year, minimizing recalibration frequency.
Environmental Resilience
- Enclosure Rating: IP66 and NEMA 4X, ensuring protection against dust ingress, high-pressure water jets, and corrosive atmospheres.
- Ambient Operating Temperature: -40°C to +85°C (-40°F to +185°F).
- Hazardous Area Certification: ATEX/IECEx Zone 2/22 (Ex nA IIC T6 Gc), FM/CSA Class I, Div. 2 for non-explosive but harsh environments.
Power and Communication
- Power Supply: 12-45 V DC, compatible with most industrial power systems.
- Output Signal: 4-20 mA with HART® 7 protocol for bidirectional digital communication.
- Wireless Option: Optional WirelessHART® module for cable-free installations.
3. Advanced Functional Features
a) HART® 7 Communication
The transmitter leverages HART® 7's capabilities for:
- Remote Configuration: Adjust sensor type, range, damping, and diagnostics via Emerson's AMS Device Manager or third-party HART® tools.
- Real-Time Diagnostics: Access device health metrics, process variables, and predictive maintenance alerts without interrupting the analog signal.
b) DIN Rail Mounting
- Space-Saving Design: TS35 DIN rail mounting simplifies installation in control cabinets, reducing wiring complexity and panel space.
- Tool-Free Terminals: Spring-loaded terminals enable quick, secure wiring without screws, ideal for high-vibration settings like offshore platforms.
c) Safety and Compliance
- SIL 2 Certification: Complies with IEC 61508/61511 for use in safety instrumented systems (SIS), such as over-temperature protection in reactors.
- Galvanic Isolation: 1 kV isolation between sensor, power, and output circuits prevents ground loops and electrical interference.
4. Design and Durability
Robust Construction
- Housing: Flame-retardant polycarbonate enclosure with UV resistance, suitable for outdoor or chemical exposure.
- Terminal Protection: Transparent cover safeguards connections from dust and accidental contact while allowing visual inspection.
- Optional Display: A local LCD module (add-on) shows real-time temperature, percentage of range, and diagnostic messages.
Installation Flexibility
- Sensor Compatibility: Direct wiring to 2-, 3-, or 4-wire RTDs; supports intrinsic safety barriers for Zone 2 installations.
- WirelessHART® Integration: Eliminates cabling costs in remote or hard-to-access locations like tank farms.
Company Profile
KeRul (WeiFang) Automation Equipment Co., Ltd. is speciallzed in industrialautomation instrument development, production and sales, technical servicesand supporting equipment supply of specialized companies, The mainproducts are fow meters, level meters, temperature meters, pressuremeters, electrical meters, thermal meters, programmable controller(PLC), Dcs distributed control system, eight series of more than 1,000specifcations. its products and technologies are widely used in electrlcpower, metallurgy, petrochemical, environ. mental protection, plastics,food,l printing, tobacco, textile, dyeing and other fields.
Our Services
OEM / ODM services
To meet the user diversified requirement, Holykell have established a set of customer service and technical support system with OEM / ODM order as the center, and responded and Handle the customer's requirements in a timely manner to ensure accurate delivery time and product quality.
Order services
Fastest reply:Professional sales engineers 7/24 online services
Payment terms:T/T ,Western union, Paypal, Credit Card, L/C others
Fast delivery: within 24 hours release the cargo (normal spec.), Customized 7-12 days after payment .
MAINTENANCE & AFTER-SALES SERVICES
Customer Feedback: Sales engineers and technical engineers will be one-on-one service for you to exclude all obstacles when use our sensors.
Warranty period: 12 months
Product life-long maintenance: Holykell can provide you with the maintenance of the whole life of the sensors
FAQ
Q: How long will you give me the reply?
A: We will reply to you as soon as we see the information
Q: What is the delivery time?
A:The products in stock will be shipped after receiving the payment, and the products that need to be ordered are subject to the factory time.
Q: How about your package?
A: Do not worry about the package, we have rich experience in packing.
Q: How about the payment terms?
A:You can choose T/T.
Q: What is the MOQ?
A:1PC.
Q: Can I get a lower price if I order large quantities?
A: Yes, cheaper prices with more bigger size orders.
Q:After sales and warranty?
A: We provide one year warranty lifetime technical support services.
