RD-L904 Multi-Parameter Water Quality Meter | Roundfin
1. Measures conductivity, TDS, salinity, resistivity and dissolved oxygen
2. One- to five-point automatic conductivity calibration
3. Automatic or manual temperature compensation
4. Stores up to 500 measurement records
5. USB output for data transfer and interval readings
6. Large 125 x 100 mm backlit LCD
Product Overview
The Roundfin RD-L904 is a bench-top multi-parameter water quality meter for conductivity, total dissolved solids, salinity, resistivity, dissolved oxygen and temperature measurements. It combines guided calibration, automatic endpoint locking, temperature compensation and a 500-record memory in one instrument. The meter is designed for laboratory water testing, environmental analysis, research and quality control where several electrochemical parameters must be recorded.
Technical Specifications
| Model | RD-L904 |
|---|---|
| Conductivity range | 0.01 uS/cm to 200.0 mS/cm across selectable ranges |
| Conductivity accuracy | +/-0.5% F.S. |
| Conductivity calibration | 1-5 points |
| Conductivity cell constant | K=0.1, 1, 10 or user-defined |
| TDS range | 0.00 ppm to 200.0 ppt across selectable ranges |
| TDS accuracy | +/-1% F.S. |
| Salinity range | 0.00-80.00 ppt or 0.00-42.00 psu |
| Salinity accuracy | +/-1% F.S. |
| Resistivity range | 0.00-20.00 Mohm |
| Dissolved oxygen range | 0.00-20.00 mg/L |
| Dissolved oxygen accuracy | +/-0.2 mg/L |
| Oxygen saturation range | 0.0-200.0% |
| Dissolved oxygen calibration | 1 or 2 points |
| Temperature range | 0-105 degrees C / 32-221 degrees F |
| Temperature accuracy | +/-0.5 degrees C / +/-0.5 degrees F |
| Data storage | 500 records |
| Communication output | USB |
| Display | 125 x 100 mm LCD |
| Power | DC 5 V adapter |
| Dimensions | 210 x 188 x 60 mm |
| Instrument weight | 1.5 kg |
Key Features
Automatic endpoint locking retains stable readings for review and recording.
Calibration reminders can be set from 1 to 31 days or switched off.
Selectable linear or pure-water conductivity compensation supports different samples.
Salinity and atmospheric-pressure compensation improve dissolved oxygen measurements.
The setup menu controls calibration points, resolution, stability, units, date and time.
Up to 500 records can be stored and transferred through the USB interface.
A reset function restores the instrument to its factory settings when required.
Applications
Laboratory analysis of purified, process and general water samples
Environmental monitoring and teaching laboratory measurements
Food, pharmaceutical and industrial quality-control testing
Research requiring conductivity, salinity or dissolved oxygen records
Frequently Asked Questions
Which parameters can the RD-L904 measure?
It measures conductivity, TDS, salinity, resistivity, dissolved oxygen, oxygen saturation and temperature with the appropriate electrodes and settings.
How many calibration points are supported?
Conductivity mode supports one to five calibration points, while dissolved oxygen mode supports one- or two-point calibration.
Can measurement records be exported?
Yes. The instrument stores up to 500 records and provides a USB communication output for transfer to a computer or timed interval readings.
Does it compensate for temperature?
Yes. The meter supports automatic or manual temperature compensation over 0-100 degrees C, subject to the connected probe and selected mode.
Explore related laboratory and pathological equipment or contact Roundfin for configuration and quotation details.
