The EM-500 series launched by Pyxis is an online algae water quality analyzer. Chlorophyll a is the main photosynthetic pigment of algae and an important indicator for evaluating algal biomass. Chlorophyll a can emit fluorescence under excitation light, and its fluorescence intensity is proportional to the concentration of chlorophyll a. The analysis of total algae in water bodies is based on in-situ detection of chlorophyll a fluorescence characteristics in algal cells, in order to evaluate the biomass of algae in water bodies.
Cyanobacteria is the dominant population during algal blooms in water bodies, and the microcystins produced by cyanobacteria are possible carcinogens with tumor promoting effects and can lead to primary liver cancer. The unique phycocyanin of blue-green algae (phycocyanin in seawater) is an effective feature that distinguishes blue-green algae from total algae and phytoplankton. The blue-green algae analyzer utilizes the weak fluorescence characteristics of phycocyanin and phycoerythrin at different excitation wavelengths to monitor the biomass of living blue-green algae in water samples.
This series of products can detect chlorophyll a and blue-green algae in water samples. No need for extraction and pretreatment, online real-time detection, simple and convenient, integrating Pyxis' advanced technology in optical measurement.
The EM-500 series online algae probe adopts fluorescence detection technology with high sensitivity. The probe can be assembled into a customized tee, which has two three-quarters inch (DN20) NPT internal threaded openings for easy installation into the same three-quarters inch (DN20) water intake circuit. The online probe has an internally isolated 4-20mA current output and can be connected to any controller that supports isolated or non isolated 4-20mA inputs;
The design of the EM-500 series online algae probe makes it very easy to clean, which can avoid the accumulation of impurities from affecting the measurement.
Typical applications:
- Monitoring of drinking water sources, such as Rivers and Lakes, reservoirs, etc
- Water plant inlet inspection
- Water bloom outbreak warning
- Solutions for measuring algae in the ocean, etc

Instrument features:
- In situ detection, no extraction required, simple and easy to measure, no reagents, real-time online monitoring;
- Compared with traditional measurement methods, it has high reproducibility and correlation;
- Pollution resistant design: Embedded quartz tube flow channel design, greatly reducing the need for cleaning and maintenance;
- Built in transmitter, no need for preamplifier or header, directly outputs RS485 or 4-20mA isolated signal, more stable and accurate long-distance transmission;
- Calibration, data recording, and diagnosis can be performed on personal computers or smartphones through Bluetooth/USB adapters;
- Before leaving the factory, the probe undergoes pressure aging testing and pre calibration to ensure stability and reliability, and can be directly put into operation on site;
- Standard IP67 aviation connector, can be directly connected to Pyxis UC-100/UC-1000 universal controller;
- Optional submerged installation components, suitable for monitoring sludge concentration in sewage, tap water and other filter tanks;
Technical specifications:
project | EM-500 | EM-501 | EM-502 |
Detection object | chlorophyll-a | Blue green algae (freshwater) | Blue green algae (seawater) |
range | 0.1~50/0.1~500ppb | 0.05~200000 cells/mL | 0.05~200000 cells/mL |
LOD (detection limit) | 0.1ppb | 500 cells/mL | 500 cells/mL |
reproducibility | ≤ 3% or 0.1ppb | ≤3% | ≤3% |
Detection Principle | fluorescence | ||
Suggested flow rate | 0-3m/s | ||
working voltage | 12-36 VDC, power~1W | ||
signal output | 4-20mA analog output/RS-485 digital output | ||
cable joint | IP67 aviation connector, cable length 1.5m (4.5ft) | ||
Working pressure | ≤6.9Bar(100psi) | ||
operation temperature | 0~50℃(32~104℉) | ||
storage temperature | -20~60℃(-4~140℉) | ||
Probe material | Shell: CPVC; Detection channel: Optical quartz tube | ||
Probe size | L172.7mmר36.6mm | ||
Probe weight | 170g(0.37lbs) | ||
Installation method | 3/4 "three-way installation component, socket or NPT threaded connection | ||
protection grade | IP67 | ||
Calibration | Calibrate based on experimental results2 | ||
calibration cycle | 6-12 months | ||
Product Certification | CE,RoHS | ||
Cleaning system3 | Compressed air blowing | ||
Warranty period | 1 year |