LONN800A split-type portable density & Concentration meter and handheld concentration meter, ±0.001g/cm³ density accuracy, ±0.5% concentration accuracy. Tuning fork sensor, 4.3″ touch screen, detachable probe, 5-second response.
The LONN800A split-type portable density meter is a handheld density and concentration measurement instrument with a detachable tuning fork sensor probe, designed for on-site liquid testing in petroleum, chemical, pharmaceutical, food & beverage, and metallurgical applications. With ±0.001 g/cm³ accuracy and ±0.5% concentration accuracy, this portable concentration meter delivers laboratory-grade precision in the field — while the innovative split-type architecture enables safe measurement in deep, narrow, or hazardous containers.
Unlike integrated handheld density meters, the LONN800A separates the 4.3-inch color LCD touch screen host from the 316L stainless steel tuning fork sensor probe via a flexible cable (1.5 m standard, extendable to 10 m). The operator holds the lightweight aluminum-alloy host while lowering the probe into the test liquid — keeping electronics and hands at a safe distance from hot, corrosive, or flammable samples.
As a tuning fork densitometer and tuning fork concentration meter, the LONN800A measures fluid properties and concentration by detecting changes in the natural vibration frequency of the fork element when immersed in liquid. This proven oscillating principle provides excellent stability, fast response (≤5 seconds), and immunity to external vibration — outperforming hydrometers, pycnometers, and radiometric methods.
The LONN800A ’s defining advantage over conventional handheld density meters is its detachable probe architecture. The cylindrical 316L stainless steel tuning fork probe (Φ25×150 mm) connects to the aluminum-alloy touch screen host via a flexible cable. This enables the portable density meter to reach liquids in deep tanks, narrow-mouthed drums, underground storage vessels, and elevated platforms — scenarios where an integrated handheld instrument simply cannot fit. The operator stays at a safe distance while the probe does the work.
The LONN800A functions as both a tuning fork densitometer and a tuning fork concentration meter — simultaneously measuring specific gravity (0-2.5 g/cm³) and concentration (0-100%) from a single immersion. Pre-programmed conversion curves cover ethanol-water, sucrose-water, sulfuric acid-water, and sodium hydroxide-water solutions. Custom curves can be uploaded via USB for proprietary fluids. No separate instruments, no manual calculations, no lookup tables.
With ±0.001 g/cm³ density accuracy, ±0.5% concentration accuracy, and 0.0001 g/cm³ resolution, the LONN800A portable density meter rivals benchtop oscillating U-tube instruments — at a fraction of the size and weight. The tuning fork vibration principle delivers drift-free, repeatable measurements even in environments with moderate mechanical vibration, making this handheld instrument ideal for field use near pumps, motors, and process equipment.
The 4.3-inch color LCD touch screen provides a modern, intuitive interface for the portable concentration meter. Large-format readings show density, temperature, and concentration simultaneously. Users can switch units (g/cm³, kg/m³, lb/gal, °API, °Brix), review trend graphs, configure temperature compensation, run calibration wizards, and export data — all through responsive touch input. For button-operation preference, the LONN800 variant is available.
The standard 1.5-meter cable handles most field applications. For deep tank profiling, underground storage access, or overhead measurements, optional 3 m, 5 m, and 10 m extension cables maintain full measurement accuracy. The cable carries electrical signals only — it does not affect tuning fork densitometer performance regardless of length. This makes the LONN800A a truly versatile handheld concentration meter for complex industrial environments.
The LONN800A is built for daily industrial use:
| Specification | Value |
|---|---|
| Density Range | 0-2.5 g/cm³ (0-2500 kg/m³) |
| Density Accuracy | ±0.001 g/cm³ (±1 kg/m³) |
| Density Resolution | 0.0001 g/cm³ (0.1 kg/m³) |
| Density Repeatability | ±0.0002 g/cm³ |
| Concentration Range | 0-100% (calibrated at 20°C) |
| Concentration Accuracy | ±0.5% |
| Concentration Resolution | 0.1% |
| Concentration Repeatability | ±0.2% |
| Measuring Principle | Tuning fork vibration (oscillating) |
| Response Time | ≤ 5 seconds |
| Sample Temperature Range | 0-80°C (liquid sample) |
| Ambient Temperature Range | -20-60°C |
| Power Supply | Built-in lithium battery (7.4V / 3000mAh) + USB-C charger |
| Battery Life | ≥ 12 hours continuous operation |
| Display | 4.3-inch TFT LCD, 480×272, capacitive touch |
| Communication | RS485 Modbus RTU (standard) |
| Optional Output | 4-20mA analog output |
| Data Storage | 10,000 measurement records (with timestamp) |
| Probe Material | 316L stainless steel |
| Host Material | Aluminum alloy, anodized finish |
| Cable Length (Standard) | 1.5 m (M12 waterproof connector) |
| Cable Length (Optional) | 3 m / 5 m / 10 m |
| Probe Dimensions | Φ25 × 150 mm |
| Host Dimensions | 165 × 85 × 35 mm (L×W×H) |
| Probe Weight | ~280 g |
| Host Weight | ~450 g (including battery) |
| Protection Class | IP65 (probe) / IP54 (host) |
| Calibration | Single-point air / Two-point fluid |
| Charging Time | ≤ 3 hours (USB-C, 5V/2A) |
| Auto-off | Configurable (1-30 minutes) |
The LONN800A provides critical fluid property and concentration measurement at wellheads, separators, loading docks, and tank farms. Measure crude oil API gravity, fuel oil verification during blending, and lubricant oil quality control. The split-type probe reaches deep into storage drums and underground tanks from ground level — something no integrated handheld instrument can do. The 10-meter cable option enables tank farm profiling at multiple depths.
As a portable concentration meter for chemical plants, the LONN800A rapidly verifies acid concentration (sulfuric, hydrochloric, nitric), caustic concentration (NaOH, KOH), solvent purity (methanol, ethanol, glycerol, acetone), and intermediate product quality. The detachable 316L stainless steel probe handles corrosive chemicals safely, while the host unit stays away from vapors and splashes. Custom concentration curves allow configuration for proprietary chemical formulations.
Pharmaceutical manufacturers use the LONN800A handheld density meter to verify API solution quality, injection liquid concentration, oral syrup properties, and fermentation broth characteristics. The tuning fork concentration meter provides traceable concentration measurements with pre-programmed standard curves (ethanol-water, sucrose-water, sulfuric acid-water). The split-type design enables measurement in deep bioreactor vessels without removing the host from the clean area.
From craft breweries to large-scale beverage plants, the LONN800A handheld concentration meter supports sugar concentration (°Brix), alcohol concentration (%ABV), dairy product testing, juice concentrate quality, and honey grading. The 5-second response time enables rapid inline quality checks during production. Food-grade 316L stainless steel probe complies with FDA 21 CFR 177.40 and EU Regulation 1935/2004.
Metal finishing operations depend on the LONN800A portable density meter for plating bath monitoring, acid pickling concentration control, anodizing electrolyte verification, coolant concentration measurement, and quenching oil testing. The IP65-rated probe tolerates harsh plating environments while the touch screen host remains clean and readable.
Environmental agencies and compliance teams use the LONN800A handheld concentration meter for wastewater effluent screening, groundwater contamination assessment, spill response characterization, landfill leachate monitoring, and stormwater runoff quality checks. The instrument provides instant on-site results for rapid decision-making during environmental incidents.
Air Calibration (Quick Check — Recommended Weekly)
Two-Point Fluid Calibration (Full Calibration — Recommended Monthly)
The LONN800A operates as a tuning fork densitometer and tuning fork concentration meter using the oscillating tuning fork vibration principle. A precision tuning fork inside the 316L stainless steel probe is driven to vibrate at its natural resonant frequency by an electromagnetic excitation coil. When the fork tines are immersed in a liquid, the surrounding fluid adds “added mass” to the oscillating system, lowering the resonant frequency in a predictable manner directly proportional to the liquid’s specific gravity.
The relationship follows: ρ = A × T² + B × T + C, where ρ is fluid density, T is oscillation period, and A/B/C are calibration coefficients determined during factory calibration using traceable reference fluids. The onboard microprocessor converts every period measurement into density and concentration values displayed on the touch screen.
A built-in PT1000 temperature sensor adjacent to the tuning fork provides automatic temperature compensation — all density readings are referenced to the user-selected temperature (default 20°C). This ensures the instrument delivers consistent results regardless of sample temperature.
Advantages of tuning fork vibration technology in the LONN800A :
| Scenario | Integrated Handheld Density Meter | LONN800A Split-Type Portable Density Meter | Advantage |
|---|---|---|---|
| Small beaker testing | Convenient, one-handed | Requires two hands or resting host | Integrated |
| Deep drum/tank measurement | Arm reach limited, risky | Lower probe safely, read from above | LONN800A |
| Hot or corrosive sample | Electronics exposed to vapor | Host stays at safe distance | LONN800A |
| Narrow opening container | Device may not fit | Slim probe (Φ25 mm) fits through small neck | LONN800A |
| Hazardous area measurement | Entire unit must be Ex-rated | Only probe needs Ex-rating (lower cost) | LONN800A |
| Continuous fixed monitoring | Not designed for it | Leave probe immersed, check host periodically | LONN800A |
| Confined space entry | Operator must enter | Operator stays outside, passes probe in | LONN800A |
| Field mobility between points | Single compact unit | Slightly more to carry with cable | Integrated |
| Benchtop lab use | Takes less desk space | Cable adds clutter | Integrated |
Q: What is the difference between the LONN800A and the LONN800? A: The LONN800 is an integrated handheld density meter with the sensor probe built into the handle — ideal for beaker and flask testing with one-handed operation. The LONN800A is a split-type portable density meter with a detachable tuning fork sensor probe connected via flexible cable — designed for deep tanks, narrow containers, and hazardous environments where the display must stay at a safe distance from the sample. Both deliver ±0.001 g/cm³ density accuracy and function as portable concentration meters. Choose LONN800A for reach and safety; choose LONN800 for simplicity and portability.
Q: Does the cable length affect tuning fork densitometer accuracy? A: No. The cable carries electrical signals between the probe and host — it does not participate in the density measurement physics. Whether you use the standard 1.5 m cable or a 10 m extension, the tuning fork densitometer accuracy remains ±0.001 g/cm³. The cable only affects the physical reach of the instrument, not its measurement performance.
Q: Can the LONN800A measure volatile or flammable liquids? A: Yes, the 316L stainless steel probe is chemically compatible with most organic solvents including gasoline, diesel, acetone, alcohols, and ketones. However, the standard version is not intrinsically safe. For flammable liquids in potentially explosive atmospheres, order the LONN800A -EX intrinsically safe handheld concentration meter, certified Ex ib for Zone 0/1/2 hazardous areas.
Q: What concentration measurement curves are pre-programmed? A: The LONN800A portable concentration meter comes pre-loaded with four standard density-concentration correlations:
Custom concentration curves can be created using the included PC software and uploaded via USB for proprietary or uncommon fluid mixtures.
Q: What is the minimum sample volume required? A: Only 30 mL of liquid is needed to fully immerse the tuning fork sensor section of the probe — significantly less than the 50+ mL required by integrated handheld instruments. For best accuracy, 40-50 mL is recommended to ensure adequate clearance around the probe body.
Q: How long does the built-in battery last? A: The LONN800A provides ≥ 12 hours of continuous operation on a full charge — 50% longer than the LONN800 integrated version. Charging time is approximately 3 hours via USB-C (5V/2A). A low-battery indicator appears on the touch screen when charge drops below 10%.
Q: How often should I calibrate the LONN800A ? A: For critical measurements (pharmaceutical, finalized product QC), perform air calibration daily and two-point fluid calibration monthly. For general use (incoming inspection, process monitoring), calibrate weekly. Annual factory recalibration with traceable certificate is recommended. The tuning fork densitometer design ensures excellent long-term stability between calibrations.
Q: Can the LONN800A be used for food-grade applications? A: Yes. The wetted parts (316L stainless steel probe) comply with FDA 21 CFR 177.40 and EU Regulation 1935/2004 for food contact materials. The probe is easily sanitized with CIP procedures using approved food-grade sanitizers. The handheld concentration meter is widely used in dairy, brewing, and beverage applications.
Q: Is the LONN800A compatible with SCADA or DCS systems? A: Yes. The standard RS485 Modbus RTU interface integrates with all major PLC, DCS, and SCADA platforms (Siemens, Allen-Bradley, Schneider, Yokogawa, Honeywell, Emerson). Optional 4-20mA analog output is available for legacy analog monitoring systems.
Q: What is the warranty period? A: The LONN800A comes with a 12-month standard warranty covering manufacturing defects and sensor performance within specifications. Extended warranty options (24 months, 36 months) are available. The warranty does not cover damage from misuse, exposure to incompatible chemicals, or normal wear on consumables (O-rings, cables). Annual factory recalibration is recommended.
Ready to configure your LONN800A ? Fill out our RFQ form or email anna@xalonn.com with the following details:
LONNMETER is a trusted manufacturer of industrial density and concentration measurement instruments, serving the petroleum, chemical, pharmaceutical, food & beverage, metallurgical, and environmental sectors. With ISO9001 certification and global export to 130+ countries, LONNMETER delivers accurate, reliable, and portable measurement solutions — including tuning fork densitometers, portable density meters, handheld concentration meters, and online density monitoring systems.
Contact LONNMETER: anna@xalonn.com
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