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MQ-510: Full Spectrum Underwater Quantum Meter

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  • Apogee Instruments MQ-510 Full-spectrum Underwater Quantum Meter
  • Apogee Instruments MQ-510 Full-spectrum Underwater Quantum Metermeasures underwater PAR
  • Apogee Instruments MQ-510 Full-spectrum Underwater Quantum Meter measures underwater PAR
  • Full-spectrum sensor
  • Full-secturm sensor-back
  • Full-spectrum sensor-side

Product Description

4/4/2017: For an important product notice on quantum sensors and meters (500 series), click here.


The MQ-510 quantum meter is designed for underwater PAR measurements 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 sample and log mode, and will record an integrated daily total in mol m-2 d-1. Sample mode will record up to 99 manual measurements. Log mode will power the meter on/off to make a measurement every 30 seconds. Every 30 minutes the meter will average the sixty 30 second measurements and record the averaged value to memory. The meter can store up to 99 averages, once full it will start to overwrite the oldest measurement with new ones. An integrated daily total will be recorded from the 48 averaged measurements (making a 24 hr period). Sample and log measurements can be reviewed on the LCD display or by downloading the data to a computer, however, the integrated daily total can only be viewed by downloading the data to a computer. Downloading data to a computer requires the AC-100 communication cable (a standard USB cable will not work) and ApogeeAMS software.


Specification Sheets
Technical Information
Technical Drawings
Technical Information


Articles Featuring Apogee's Underwater Quantum Meters

Apogee MQ-510 Is The First Truly Underwater PAR Meter For Hobbyists - Jake Adams, Reef Builders

Dana Riddle Reviews the Apogee MQ-500 Quantum (PAR) Meter - Dana Riddle, Advanced Aquarist

How is the MQ-510 different
from previous Apogee quantum sensors?

The MQ-510 performs exactly the same underwater as the MQ-500, but the MQ-510 simply multiplies the PAR reading by 1.32 to account for the immersion effect. The MQ-510 is a full-spectrum quantum sensor (SQ/MQ-500 Series) with a spectral range of 389 to 692 nm ± 5 nm, which can be seen in the graph below. This improved spectral respose increases the acuracy of LED measurements.
SQ-500 & SQ-100 Spectral Response

Where is the MQ-510 used?

The MQ-510 is used to measure incoming PPFD measurements in aquarius environments.


Apogee Instruments Meter User Guide


Calibration Uncertainty
± 5 %
Measurement Range
0 to 4000 µmol m-2 s-1
Measurement Repeatability
Less than 0.05 %
Long-term Drift (Non-stability)
Less than 2 % per year
Less than 1 % (up to 4000 µmol m-2 s-1)
Response Time
Less than 1 ms
Field of View
180 °
Spectral Range
389 to 692 nm ± 5 nm ( wavelengths where responsis greater than 50 %)
Spectral Selectivity
Less than 10 % from 412 to 682 nm ± 5 nm
Directional (Cosine) Error
Less than ± 5 % at 75° zenith anglean 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 % C-1
Uncertainty in Daily Totals
Less than 5 %
Blue-enhanced silicon photodiode
Anodized aluminum body with acrylic diffuser
IP Rating
Operating Environment
0 to 50 C; less than 90 % non-condesing relative humidity up to 30 C; less than 70 % non-condensing relative humidity from 30 to 50 C; separate sensors can be submerged in water up to depths of 30 m
Meter Dimensions
126 mm length; 70 mm width; 24 mm eight
Sensor Dimensions
24 mm diameter; 37 mm height
180 g
2 m of two conductor, shielded, twisted-pair wire; addititonal cable wire available; santoprene rubber jacket

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