Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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User's Manual
The MQ-650 ePAR meter is designed for underwater extended PAR measurements (400-750 nm) and already applies the sensor's immersion effect correction factor to the meter readings through firmware. The meter provides excellent measurements under all light sources, including LEDs. The meter consists of a waterproof quantum sensor attached via waterproof cable to a handheld meter. The waterproof sensor incorporates a blue-enhanced silicon photodiode and custom optical filters with a rugged, anodized aluminum body with acrylic diffuser. The underwater quantum sensor is typically used in salt water aquariums where corals are grown. Note: The handheld meter is not waterproof, only the sensor and cable are waterproof.
The meter has a sampling and logging mode and will record a combined daily total of mol m-2 d-1 units. The sampling mode will record up to 99 manual measurements. The logging mode will turn the instrument on/off and take measurements every 30 seconds. Every 30 minutes, the instrument will average 60 30 second measurements and record the average value into memory. The instrument can store up to 99 average values. Once it is full, it will begin to overwrite the old measured values with new ones. The combined daily total will be recorded from 48 average measurements (over a 24-hour period). The sample and log measurements can be viewed on the LCD screen or by downloading data to the computer, but the combined daily totals can only be viewed by downloading data to the computer. AC-100 communication cable (standard USB cable does not work) and Apogee AMS software are required to download data to the computer.
| Calibration Uncertainty | ± 5 % |
| Measurement Range | 0 to 4000 μmol mˉ2 sˉ1 |
| Measurement Repeatability | Less than 0.05 % |
| Long-term Drift (Non-stability) | Less than 2 % per year |
| Non-linearity | Less than 1 % (up to 4000 μmol mˉ2 sˉ1) |
| Response Time | Less than 1 ms |
| Field of View | 180? |
| Spectral Range | 400 to 750 nm ± 5 nm ( wavelengths where response is greater than 50 %) |
| Directional (Cosine) Error | Less than ± 5 % at 75? zenith angle and 10 % from 412 to 682 nm ± 5 nm |
| Azimuth Error | Less than 0.5 % |
| Tilt Error | Less than 0.5 % |
| Temperature Response | -0.11 ± 0.04 % ℃ˉ1 |
| Uncertainty in Daily Totals | Less than 5 % |
| Detector | Blue-enhanced silicon photodiode |
| Housing | Anodized aluminum body with acrylic diffuser |
| IP Rating | IP68 |
| Operating Environment | 0 to 50 ℃, less than 90 % non-condesing relative humidity up to 30 ℃, less than 70 % non-condensing relative humidity from 30 to 50 ℃; separate sensors can be submerged in water up to depths of 30 m |
| Meter Dimensions | 126 mm length, 70 mm width, 24 mm height |
| Sensor Dimensions | 30.5 mm diameter, 37 mm height |
| Mass | 180 g |
| Cable | 2 m of two conductor, shielded, twisted-pair wire; additional cable available; TPR jacket |
| Warranty | 4 years against defects in materials and workmanship |
| Manufactured | Made in the USA |
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