LONN-DN100 split type viscometer for online viscosity measurement in hazardous areas. Ex d IIC T6 flameproof, 4-20mA + RS485 Modbus. Also measures density.
The LONN-DN100 split type viscometer delivers continuous, real-time viscosity measurement for industrial process fluids — without radioactive sources. Designed for hazardous environments, this split type viscometer separates the sensing fork from the transmitter electronics via a sealed cable assembly, enabling remote display mounting in safe locations while the sensor stays in the process line.
This online viscometer uses the tuning fork vibration principle: the fork tines resonate at a frequency that shifts with changes in liquid viscosity, providing real-time viscosity data from a single process penetration. No bypass loops, no sampling valves, no laboratory delays — the LONN-DN100 feeds viscosity data directly into your DCS, PLC, or SCADA system through 4-20mA active output and RS485 Modbus RTU communication. As a bonus, the instrument also outputs density data from the same fork sensor, giving operators two process parameters from one device.
Built for reliability in demanding conditions, this split type viscometer carries Ex d IIC T6 flameproof certification, withstands ambient temperatures from -40°C to +85°C, and features field-configurable measurement ranges with on-site menu calibration, micro-tuning adjustment, and automatic temperature compensation. Whether you are monitoring chemical reactor viscosity, crude oil viscosity, pharmaceutical solvent quality, or cutting fluid condition, the LONN-DN100 provides the measurement certainty your process demands.
Most process viscometers measure viscosity only — requiring a separate density instrument if density data is needed. The LONN-DN100 split type viscometer gives you both viscosity and density from a single fork sensor. This means one process penetration, one calibration routine, and one maintenance point instead of two. The 4-20mA active output and RS485 Modbus RTU communication deliver both values to your control system without additional signal conditioners. Density data is derived from the same resonant frequency analysis, providing correlated dual-parameter monitoring for processes where viscosity and density trends matter together.
Standard integrated instruments force operators to climb ladders, enter confined spaces, or work near hot or vibrating piping just to read a display. The LONN-DN100 split type viscometer separates the transmitter enclosure — with its five-digit backlit LCD showing viscosity, density, temperature, and loop current — from the sensing fork installed in the process line. Mount the transmitter on a wall, panel, or pipe stand at eye level in a safe, accessible zone while the fork sensor endures the process environment. This configuration protects sensitive electronics from:
The LONN-DN100 split type viscometer carries Ex d IIC T6 flameproof (隔爆) certification, making it suitable for Zone 1 and Zone 2 hazardous areas in oil refineries, chemical plants, gas processing facilities, and pharmaceutical manufacturing. The flameproof enclosure contains any internal explosion, preventing ignition of the surrounding explosive atmosphere. Combined with the intrinsically safe sensor circuit, this explosion proof viscometer provides complete safety coverage for flammable liquid and gas environments.
Process conditions change — raw material batches vary, product specifications shift, seasonal temperature fluctuations affect viscosity. The LONN-DN100 allows operators to configure measurement ranges, set calibration segments, adjust temperature compensation coefficients, and fine-tune damping directly through the front-panel menu system. No laptop, no proprietary software, no specialized programmer required. The five-digit display shows real-time values and supports on-site parameter adjustment.
This industrial viscometer handles aggressive chemicals, petroleum products, and industrial fluids that challenge conventional instruments. The standard 316L stainless steel wetted parts resist corrosion in most applications, while optional materials accommodate specialty media. Typical process fluids successfully monitored include:
| Specification | Value |
|---|---|
| Measurement Principle | Tuning fork vibration frequency analysis |
| Viscosity Range | 0 – 10,000 mPa·s (field-calibratable segment) |
| Density Range | 0 – 2 g/cm³ (secondary output) |
| Viscosity Accuracy | ±2.5% of reading (at calibrated range) |
| Viscosity Repeatability | ±1% |
| Density Resolution | 0.0001 g/cm³ (4 decimal places) |
| Temperature Compensation | Automatic, built-in PT100 |
| Medium Temperature | 0°C to +60°C (liquid) |
| Ambient Temperature Range | -40°C to +85°C (transmitter) |
| Max Working Pressure | < 1.0 MPa |
| Explosion Protection | Ex d IIC T6 (flameproof, 隔爆) |
| Signal Output | 4-20mA active (4-wire) + RS485 Modbus RTU |
| Power Supply | 24V DC (external power source required) |
| Display | 5-digit backlit LCD: density, temperature, loop current |
| On-Site Configuration | Menu-driven via 4-button keypad |
| Special Functions | Micro-tuning adjustment, temp compensation, field calibration |
| Wetted Materials | 316L stainless steel (standard); optional materials available |
| Process Connection | Flange (DN/DIN/ANSI) or Thread (NPT/BSP) |
| Cable Connection | Sealed multi-conductor, moisture-proof |
| Electrical Protection | Moisture seal at enclosure lid, effective grounding required |
| Housing Material | Die-cast aluminum with powder coating |
The LONN-DN100 split type viscometer pairs well with other LONNMETER process instruments. For applications requiring high-temperature density measurement up to +200°C, consider the LONN-700S split type tuning fork density meter. For non-nuclear slurry concentration monitoring in mining, the LONN7000 ultrasonic density meter offers a dedicated concentration solution.
Chemical reactors, blending tanks, and distillation columns require continuous online viscosity monitoring to maintain product quality and process efficiency. The LONN-DN100 split type viscometer handles aggressive chemical media including sulfuric acid, nitric acid, hydrochloric acid, and phosphoric acid. The split body design keeps electronics safely away from chemical vapor exposure while the 316L sensor resists corrosion.
Key chemical applications:
Crude oil viscosity varies widely by source, and pipeline operators depend on continuous viscosity measurement for pump scheduling, flow assurance, and custody transfer quality checks. This inline viscosity meter provides real-time data at pipeline terminals, tank farms, blending stations, and refinery process units. The flameproof Ex d certification enables safe installation in Class I Division 1 hazardous locations.
Oil & gas applications include:
Batch consistency in pharmaceutical production demands precise viscosity control. This process viscometer enables real-time monitoring of active pharmaceutical ingredient (API) solutions, reaction mixtures, and purification streams without interrupting production. The removable sensor design simplifies cleaning between batches, and the field-configurable calibration accommodates different solvent profiles.
Pharmaceutical use cases:
Asphalt emulsions, modified bitumen, and polymer-modified binders require tight viscosity control for consistent application properties. The LONN-DN100 monitors viscosity in real time during hot mix production, emulsion preparation, and storage tank circulation — ensuring every batch meets specification before delivery.
Construction material applications:
The food industry uses online viscosity measurement for syrup concentration control, product standardization, and process optimization in evaporators, crystallizers, and blending vessels. The LONN-DN100 provides continuous viscosity data for quality control and consistency monitoring.
Food processing applications:
For optimal measurement performance with this split type viscometer, follow these installation recommendations:
The LONN-DN100 uses the tuning fork vibration principle — no radioactive sources, no gamma radiation, no licensing requirements. Traditional nuclear density gauges use Cesium-137 or Americium-241 sources that require:
The non nuclear viscometer approach eliminates all of these burdens. The LONN-DN100 delivers reliable viscosity measurement (plus density as secondary data) with no regulatory footprint, no radiation safety program, and no special disposal requirements — a safer, simpler, more sustainable solution for modern process industries.
Q: Is the LONN-DN100 a viscometer or a density meter?
A: The LONN-DN100 is a split type viscometer — its primary function is continuous online viscosity measurement. It also outputs density data from the same fork sensor, giving operators two process parameters from one instrument. The density data serves as a useful secondary measurement for processes where viscosity and density trends are correlated.
Q: What is the difference between the LONN-DN100 split type viscometer and an integrated viscometer?
A: The LONN-DN100 separates the electronics transmitter from the sensor fork, while integrated viscometers house both in a single enclosure. The split design allows remote display positioning, protects electronics from heat and vibration, and enables installation in confined spaces where integrated units cannot fit. See the LONN-700S split type density meter for a similar configuration.
Q: What viscosity range does the LONN-DN100 cover?
A: The standard instrument covers 0 – 10,000 mPa·s, with field-configurable segment calibration. The measurement range can be calibrated to focus on a specific viscosity window (e.g. 0-500 mPa·s, 500-2000 mPa·s, or 2000-10000 mPa·s) for improved accuracy at the operating point.
Q: What explosion protection does the LONN-DN100 carry?
A: The LONN-DN100 is certified Ex d IIC T6 (flameproof, 隔爆), suitable for Zone 1 and Zone 2 hazardous areas with flammable gases and vapors. The flameproof enclosure prevents ignition propagation to the surrounding atmosphere.
Q: What output signals are available?
A: The standard configuration includes dual 4-20mA active outputs (4-wire) and RS485 Modbus RTU digital communication. The 4-20mA signals can be independently assigned to viscosity and density values.
Q: What is the typical calibration interval?
A: Under normal process conditions, the LONN-DN100 maintains accuracy for 12-24 months between calibrations. The field micro-tuning function allows minor adjustments on site without removing the instrument from service.
Q: Can wetted materials be customized for aggressive media?
A: Yes. While the standard wetted parts are 316L stainless steel, alternative materials can be specified for processes involving hydrochloric acid, high-temperature caustic solutions, or other corrosive fluids.
Q: Is the LONN-DN100 suitable for food-grade applications?
A: The standard 316L sensor with polished surface finish is compatible with food contact requirements in sugar processing, edible oil refining, and beverage applications. Sanitary tri-clamp connections are available upon request.
Q: How does the LONN-DN100 handle temperature compensation?
A: An integrated PT100 temperature sensor provides continuous process temperature measurement. The onboard microprocessor applies automatic temperature compensation to viscosity readings using programmed coefficients, minimizing measurement drift from thermal effects.
Ready to improve your process viscosity measurement? Contact our technical sales team for pricing, lead time, and application-specific configuration.
| Inquiry Item | Details |
|---|---|
| Product | LONN-DN100 Split Type Viscometer |
| Process Connection | □ Flange (specify: DN / ANSI / JIS) □ Thread (specify: NPT / BSP) |
| Wetted Material | □ 316L SS □ Custom (specify: ) |
| Cable Length | □ 3m □ 5m □ 10m □ Custom |
| Application | (Brief description of your process medium and conditions) |
| Quantity | ______ units |
| Target Price | ______ USD/unit |
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