AS Bioscope BrochureStrathtox Laboratory Respirometer

Benchtop Respirometer Monitors Activated Sludge

Monitor toxicity and Sludge Health in your Wastewater Treatment Plant

The Strathtox provides precision respirometry to rapidly measure actual Activated Sludge bacterial performance.

•Advanced 6-cell precision OUR measurement system
•Easy and rapid test procedures
•User friendly software providing a real time display of bacterial respiration
•Automatic Report generation and calculation of EC10,20,50 values for carbonaceous and nitrifying bacteria
•Efficient procedures gives test times of between approximately 10 and 30 minutes
•Tests provided are: Carbonaceous and Nitrifying Sludge Health, Critical Oxygen Point Analysis, Respiration Inhibition, Nitrification Inhibition, BOD(ST), and Respirometry.
•Applications in:
- Toxicity Management
- Nitrification Management
- Aeration Efficiency
- Nutrient Control
- Sludge Health
- System Trouble-shooting
- Short-term BOD
- Plant capacity
- Respiration tests

Strathtox is an integrated desktop respirometer comprising the following sub-systems:

Temperature controlled Circulating Waterbath This is used to maintain the activated sludge at constant temperature during a respirometry run. A six position magnetic stirrer is located beneath the bath. The six 20ml respirometer cells are located in a rack, for easy removal at the end of a run.
Activated Sludge Temperature Controlled Containment A flask provides aeration and containment of approximately 600ml of AS that can also be spilt for Nitrification testing.

Oxygen Electrodes These high precision electrodes are housed in electrode holders for easy insertion into the respirometer cells. They require little maintenance, other than occasional membrane changes.

Oxygen Interface The six oxygen electrodes are connected to this unit, which transmits the digital signals to the computer software.


The easy-to-use Windows software comprises 5 different tests. Each test program has a similar basic structure compromising four stages: Setup; Recording; Analysis; Report.

Technical Data

Sensors: 6 Strathkelvin Instruments 1302 oxygen electrodes, bias voltage 650 mV.
Communication: USB 1.1
Power supply: AC input: 110 to 250 volts, 50 to 60 Hz, 150VA maximum.
Ambient temperature range: +10°C to + 40°C, 20% to 80% RH.
Controlled temperature range: Ambient -10°C to 40°C.
Temperature accuracy: ±0.1°C.
Bath capacity: 700 ml. Stock flask capacity: 650 ml.
Storage temperature range: - 20°C to + 60°C.
Environmental: Indoor use at altitudes up to 2000 m. Pollution Degree 1.
Safety: Complies with EN61010-1
EMC: Complies with EN50081-1 and EN50082-1
Weight (dry): 15kg.

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