Apogee MQ-210 Underwater Quantum PAR Meter
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Product Description: 

The MQ-210 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 is excellent for all light sources, except LEDs, where post-measurement correction factors need to be applied to achieve accurate readings. 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. 

Original Sensor 

A lower-cost option that is excellent for all light sources, except most LEDs, where post-measurement correction factors need to be applied to achieve accurate readings. The original quantum sensor has a spectral range of 410 to 655 nm seen in graph to the right. The sensor is available attached to a hand-held meter that provides a digital readout (MQ-210) and in multiple analog outputs to be used with a datalogger or voltmeter.


Ready for Underwater Use

All Apogee Underwater Quantum Meters and Sensors models (MQ-210, MQ-510, SQ-520) have the immersion effect correction factor preprogramed in the firmware or sensor software allowing the user to make excellent underwater measurements right out of the box. Sensors feature a waterproof sensor head that is potted solid for a complete seal and to ensure it has no hollow cavities for water to penetrate and cause measurement errors. 


Spectral Response:


Datalogging Capabilities 

The MQ-210 and MQ-510 meters record up to 99 manual measurements. In logging mode the meter will make a measurement every 30 seconds. Every 30 minutes the meter will average the sixty 30 second measurements and record the averaged value. The meter can store up to 99 averages. The SQ-520 USB sensor has internal memory capable of storing 10,000 user-specified periodic measurements that can be downloaded to a computer. 


Calibration Uncertainty ± 5 %
Measurement Repeatability Less than 1 %
Long-term Drif (Non-stability) Less than 2 % per year
Response Time Less than 1 ms
Field of View 180°
Spectral Range 410 to 655 nm
Directional (Cosine) Response ± 5 % at 75° zenith angle
Temperature Response 0.06 ± 0.06% per C
Operating Environment 0 to 50 C; less than 90 % non-condensing relative humidity up to 30 C; less than 70 % non-condensing relative humidity from 30 to 50 C; seperate sensor can be submerged in water up to depths of 30 m
Meter Dimensions 126 mm length; 70 mm width; 24 mm height
Sensor Dimensions 24 mm diameter; 28 mm height
Mass 180g
Cable 2 m of two conductor, shielded, twisted-pair wire; additianal cable available; santoprene rubber jacket ( high water resistance, high UV stability, flexibility in cold conditions)