HI2640 and HI2641 Features
HI2640 Features
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DO Resolution: 0.01 ppm (mg/L)
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Calibration: One or two points
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Data Logging: No
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PC/USB Export: No
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Standard (Full Features): No
HI2641 Features
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DO Resolution: 0.01 ppm (mg/L)
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Calibration: One or two points
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Data Logging: Yes
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PC/USB Export: Yes
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Standard (Full Features): Yes
The Benchtop Meter for Every Lab Setting

With a color LCD display, capacitive touch keypad, and clear on-screen text guides, users can easily set up, calibrate, and measure quickly.
Our Simple Benchtop Meters are designed for both experienced professionals and those who prefer a straightforward, streamlined workflow.
Digital Smart Electrodes for Enhanced Measurements

Our Simple Benchtop Meters (HI2640 and HI2641) measure dissolved oxygen with the supplied Dissolved Oxygen Digital Smart Electrode (HI764080).
Advantages of the Dissolved Oxygen Digital Electrode
- Designed for various industries and applications, this probe is durable and suitable for use in chemical analysis.
- Collect stable readings even in electrically noisy environments and eliminate drift with automatic noise filtering and digital processing.
- The built-in temperature sensor ensures optimal temperature compensation. There is no need to manage an additional temperature probe.
- Change electrodes easily without recalibrating. All data from the last calibration is stored in the electrode for faster setup and less maintenance when switching electrodes.
- Gain traceability with automatic sensor recognition and a unique serial ID number for each Digital Electrode.
- Equipped with a modern 3.5 mm connector that is sealed to protect against moisture and corrosion.

What's Included
- HI764080 Dissolved Oxygen electrode
- DO calibration kit:
- HI7041S Refill electrolyte solution
- DO membrane caps (2 pcs.)
- O-rings (2 pcs.)
- HI764026 Electrode holder for HI2600 family
- HI920018 USB-C to USB-C cable
- USB-C power adapter
- Instrument quality certificate
- Probe / electrode quality certificate
- Battery safety insert
- Quick reference guide with QR code for instruction manual download
Specifications
| Models |
HI2640 and HI2641 using the Dissolved Oxygen probe HI764080 |
| DO Range |
0.00 to 45.00 ppm (mg/L) 0.0 to 300.0% |
| DO Resolution |
0.01 ppm (mg/L) 0.1% |
| DO Accuracy at 25 °C / 77 °F |
±1.5% of reading ±1 digit |
| Temperature Range |
-20.0 to 120.0 °C -4.0 to 248.0 °F |
| Temperature Resolution |
0.1 °C 0.1 °F |
| Temperature Accuracy at 25 °C / 77 °F |
±0.5 °C ±0.9 °F |
| DO Calibration |
One or two points at 0% (HI7040) and 100% (water-saturated air) |
| DO Pressure Compensation |
Automatic 450.0 to 850.0 mmHg |
| DO Pressure Compensation Resolution |
0.1 mmHg |
| DO Salinity Compensation |
0 to 40 g/L |
| DO Salinity Compensation Resolution |
1 g/L |
| Temperature Compensation |
0.0 to 50.0 °C 32.0 to 122 °F |
| Logging (HI2641 only) |
Up to 1000 records organized in:
Manual log-on-demand — maximum 200 logs Manual log-on-stability — maximum 200 logs Interval logging — maximum 600 logs (100 lots) |
| PC Interface (HI2641 only) |
USB-C |
| Power Supply |
USB Type-C (5 VDC) |
| Environment |
0 to 50 °C (32 to 122 °F) Maximum 95% RH non-condensing |
| Dimensions |
205 × 160 × 77 mm (8.0 × 6.2 × 3.0 inches) |
| Weight |
Approximately 0.85 kg (1.87 lbs.) |
* Temperature limits will be reduced to actual probe limits.
** Interval logging is available when operating in Standard Mode only.
DO Starter Benchtop Meter – HI2640 and HI2641
The HI2640 and HI2641 provide fast and accurate dissolved oxygen measurements using the HI764080 digital dissolved oxygen probe. Automatic sensor recognition, integrated temperature measurement, pressure and salinity compensation, and a simple user interface make these meters suitable for routine laboratory measurements.
The HI2641 additionally provides data logging and USB-C connectivity for data transfer, making it suitable for applications requiring stored and transferable measurement records.