Emerson Rosemount 3101 Level Transmitter.
| Model：3101LA1FRCNAFT
Manufacturer: ROSEMOUNT Size: 40*80*25CM Detail Specification:Level Transmitter. Comment:Carton Shipping Weight: 20Kg Estimated Lead Time: 12 Weeks Payment：T/T HS CODE：9026809000
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product details
Emerson Rosemount 3101 Level Transmitter.
Introduction
The Emerson Rosemount 3100 Series Ultrasonic Level Transmitter represents a reliable, non-contacting measurement solution for continuous liquid level monitoring across industrial applications. Manufactured under the Emerson Rosemount brand, this family of ultrasonic level transmitters delivers cost-effective performance for storage tanks, effluent pits, buffer tanks, reservoirs, and open channel flow applications-2.
The series comprises three primary models: the Rosemount 3101 Level Transmitter—the entry-level unit designed for simple level measurement with a 4–20 mA analog output—alongside the Rosemount 3102 and Rosemount 3105, which offer enhanced capabilities including HART communication, volume calculations, and open channel flow measurement-.
Product Status Notice: The Rosemount 3100 Series (3101, 3102, and 3105) has been discontinued as a standard catalog offering. This technical article is provided for reference purposes to support existing users and legacy system maintenance. For new installations, consult your local Emerson representative for current replacement solutions-8.
Ultrasonic Measurement Principle
The Rosemount 3100 Series operates on time-of-flight ultrasonic technology. The transmitter, mounted above the liquid surface, emits ultrasonic pulse signals directed toward the liquid. These pulses reflect off the liquid surface, and the transmitter “listens” for the returning echoes-24.
The microprocessor-controlled electronics calculate the distance to the liquid surface based on the time delay between transmission and reception-13. For the Rosemount 3101 specifically, the transmitter computes the liquid depth (level) and outputs the result as a 4–20 mA analog signal proportional to that level-16.
A critical component of the measurement accuracy is the integral temperature sensor, which continuously monitors air temperature around the transmitter. Since the speed of sound in air varies with temperature, the transmitter automatically compensates the calculated distance to eliminate temperature-induced errors-.
Detailed Technical Specifications
General Specifications
| Parameter | Specification |
| Product Family | Rosemount 3100 Series Ultrasonic Level Transmitters |
| Model Numbers | 3101, 3102, 3105 |
| Product Status | Discontinued (legacy/reference only) |
| Measurement Principle | Ultrasonic, time-of-flight |
Measurement Range
| Model | Maximum Range |
| Rosemount 3101 | 26 ft (8 m) |
| Rosemount 3102 | 36 ft (11 m) |
| Rosemount 3105 | 36 ft (11 m) |
The usable measurement range begins at 1 ft (0.3 m) from the transmitter face for all models. The zone within 12 in. (0.3 m) of the transmitter face is the blanking distance—the sensor cannot reliably measure within this region-16.
Accuracy and Resolution
| Parameter | Rosemount 3101 | Rosemount 3102 / 3105 |
| Accuracy (<3.3 ft / 1 m) | ±0.2 in. (5 mm) | ±0.1 in. (2.5 mm) |
| Accuracy (>3.3 ft / 1 m) | ±0.5% of measured distance | ±0.25% of measured distance |
| Level Resolution | Better than 0.04 in. (1 mm) | Better than 0.04 in. (1 mm) |
Reference conditions for accuracy specifications: 68 °F (20 °C), 1013 mbar atmospheric pressure, 50% relative humidity, calm and stable water surface-1.
Output Signals
| Model | Output Type |
| Rosemount 3101 | 4–20 mA analog only |
| Rosemount 3102 | 4–20 mA with HART digital communication |
| Rosemount 3105 | 4–20 mA with HART digital communication |
The 3101 measures level exclusively. The 3102 and 3105 can calculate distance-to-surface, volume, or open channel flow, and output the result via the 4–20 mA signal and digital HART signal-24.
Measured Variables
3101: Level only
3102: Level, distance, volume, open channel flow
3105: Level, distance, volume, open channel flow
Power Supply and Electrical
Power Supply: Two-wire 24 Vdc loop-powered
Loop Voltage: 24 Vdc nominal (requires external power source)
Maximum DC Voltage: 30 V
Maximum Current: 21.75 mA-11
Environmental Ratings
| Parameter | Specification |
| Operating Temperature Range | –4 °F to 158 °F (–20 °C to +70 °C)-11 |
| Maximum Process Pressure | 3 bar (43.51 psi)- |
| Housing Ingress Protection (Aluminum) | NEMA 4X, IP66-1 |
| Housing Ingress Protection (Polymer) | IP66 / IP67 |
Materials of Construction
| Component | Material |
| Housing Options | Polyurethane-covered die-cast aluminum or glass-filled nylon (engineered polymer) |
| Wetted Material | PVDF (corrosion-resistant) |
| Conduit Entries (Metal Housing) | ½-14 NPT |
| Conduit Entries (Polymer Housing) | 2 x M20 with nylon cable glands-11 |
| Mounting Thread | 2-inch BSPT-11 |
Display and Configuration
Display: Integral 4/5-digit LCD (all models)
Configuration (3101): Integral push-buttons under housing cover
Configuration (3102 / 3105): Local membrane buttons, HART communication (Field Communicator, AMS Device Manager, or Rosemount 3490 Series Controller)
Remote Configuration (3102 / 3105): Via HART protocol
Temperature Compensation
3101: Integral temperature sensor only (automatic speed-of-sound correction)
3102 / 3105: Integral sensor standard; optional remote temperature sensor available for dynamic environments–24
Advanced Software Features (3102 and 3105 only)
| Feature | Description |
| Learn Routine (False Echo Registration) | Transmitter can learn to ignore up to four false echoes caused by obstructions |
| Empty Tank Mapping | Enables transmitter to map tank bottom for more accurate level calculations |
Certifications and Approvals
3101: General purpose (not certified for hazardous areas)
3102: General purpose with integral signal relays
3105: Intrinsically safe certified (ATEX, CSA, IECEx, FM)
Dimensional Data
Height: Approximately 8.27 in. (210 mm) depending on housing configuration
Mounting: Above liquid surface using provided 2-inch thread; install as near vertical as possible for optimal echo reception
Complete Rosemount 3100 Series Model Number Reference
The Rosemount 3100 Series includes multiple configuration variants. Below are representative model codes for reference:
| Model Number | Configuration Description |
| 3101L1 | Ultrasonic level transmitter, 4–20 mA output, 1–26 ft range |
| 3101L1P2 | Basic level measurement, PVDF wetted material, glass-filled nylon housing |
| 3101LP2FRCG5ST | Ultrasonic level transmitter with integral display, buttons, temperature compensation, –30 °C to +70 °C operating range |
| 3101LP3FSCNA | 4–20 mA output, general-purpose configuration |
| 3102 | Ultrasonic level transmitter with 2 integral signal relays, HART communication |
| 3105 | Intrinsically safe ultrasonic level transmitter, HART communication, hazardous area certified |
Note: The above model numbers are representative examples. Actual complete model numbers include additional position codes for range, housing material, conduit entry type, and certification requirements. Consult Emerson documentation for full model number construction guidelines.
Comparison: 3101 vs. 3102 vs. 3105
| Feature | Rosemount 3101 | Rosemount 3102 | Rosemount 3105 |
| Primary Function | Simple level measurement | Level + local control | Hazardous area measurement |
| Measurement Range | 26 ft (8 m) | 36 ft (11 m) | 36 ft (11 m) |
| Output | 4–20 mA analog | 4–20 mA + HART | 4–20 mA + HART |
| Integral Signal Relays | No | 2 relays | No |
| Volume/Flow Calculations | No | Yes | Yes |
| HART Communication | No | Yes | Yes |
| Temperature Compensation | Integral sensor | Integral or remote sensor | Integral or remote sensor |
| Hazardous Area Certification | No | No | Yes (ATEX, CSA, IECEx, FM) |
| Remote Configuration | No | Via HART | Via HART |
| Configuration Method | Local push-buttons | Local + HART | Local + HART |
Installation Guidelines for Rosemount 3100 Series
Proper installation is essential for accurate measurement and long-term reliability. Follow these procedures:
Mounting Requirements
Mount Above Liquid – The transmitter must be mounted above the liquid surface using the provided 2-inch thread-16.
Vertical Alignment – Install as near vertical as possible to ensure strong echo return and maximum echo size received-16.
Avoid Metal Fittings – Mount in a non-metallic fitting or flange to prevent signal interference-16.
Avoid Electrical Noise – Keep transmitter away from sources of electrical noise-16.
Blanking Zone – Ensure maximum liquid level does not enter the 12-in. (0.3-m) blanking zone at the transmitter face-16.
Avoid Inlet Streams – Do not mount directly over inlet streams where turbulence may affect echo quality-16.
Electrical Installation
The transmitter connects to any suitable 24 Vdc power source using two-core, shielded cable-16. For models with HART communication (3102 and 3105 only), a 250 Ω (minimum), 0.25 W load resistor must be installed in the loop-.
Configuration
3101 – Configure locally using integral push-buttons revealed after removing the housing cover-.
3102 / 3105 – Configure via local membrane buttons, Rosemount 3490 Series Control Unit, Field Communicator, or PC with AMS Suite: Intelligent Device Manager software-.
Typical Applications
The Rosemount 3100 Series was deployed across a wide range of industrial applications:
Storage Tank Level Monitoring – Continuous level measurement in chemical, water, and petrochemical storage tanks
Effluent Pits and Sump Monitoring – Reliable measurement in wastewater treatment applications
Buffer Tanks – Process buffer and surge tank level control
Reservoir Level Monitoring – Water and liquid reservoir level tracking
Open Channel Flow Measurement – Flow monitoring in open channels (3102 and 3105 only)
Legacy Support and Replacement Information
As the Rosemount 3100 Series is discontinued, customers currently operating legacy installations should note the following:
No Spare Parts Available – There are no spare parts for the Rosemount 3101, 3102, and 3105. If a problem persists, contact Rosemount Inc. for guidance-.
Mounting Flanges Available – Accessories such as mounting flanges for the 3101, 3102, and 3105 remain available from third-party suppliers-.
Replacement Recommendation – Consult your local Emerson representative for current-production alternatives offering similar or enhanced ultrasonic level measurement capabilities.
Compliance and Engineering Standards
The Rosemount 3100 Series was designed and manufactured in alignment with internationally recognized standards:
Ingress Protection – NEMA 4X, IP66 (aluminum housing); IP66/IP67 (polymer housing)
Hazardous Location Approvals (3105 only) – ATEX, CSA, IECEx, FM intrinsic safety
HART Communication Protocol – HART Revision D962-
Obtain relevant certificates and quotations for the product
