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MQ-650: ePAR Underwater Meter

Updated:2025-03-13

Brand: APOGEE
Model: MQ-650
Description: 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
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Product Details

Overview of MQ-650 ePAR Underwater Meter:

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.

Drawing of MQ-650 Meter:

Specification of MQ-650 Meter:

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