Online Ammonia PBS

PBS online ammonia monitoring

ammonia monitor

PBS1 deployed in an aeration lane

The PBS is an online Ammonia analyser, using a gas sensitive electrode as the detection device. A complete self-calibrating wet chemical analyser and sample preparation system in a single housing.

This instrument represents reliable ammonia monitoring without the need for pumps, pipes, sample preparation or a site kiosk.

ammonia monitor

PBS1 transmitter

Sampling is by means of hydrostatic head, which first fills a settlement chamber to reduce solids to a minimum. Clarified liquid is then allowed into the measuring chamber, where EDTA/caustic solution is dosed and stirred to raise pH levels .

This releases ammonia gas which is detected by the GSE electrode. The system is then pressurised by the on board compressor to evacuate the liquid sample and the whole cycle is repeated.


On calibration the sample is retained in the measuring cell and dosed with one and then eight aliquots of high standard, the response being logged on each occasion. The method of standard addition is then applied to calculate the new offset and slope.

The data is logged and displayed in numeric and graphical format. The system is designed for online ammonia monitoring in activated sludge basins, bed effluents and final effluents. It is widely used across a number of municipal wastewater sites around the UK.


For more information on why the PBS is instrument of choice for a number of UK water companies, visit the PBS further information page. The PBS is suitable for Activated Sludge & Ammonia Control Monitoring as well as Final Effluent monitoring at WWTW.


  • Measuring ranges (mg/L NH4 – N): 0.1 – >50
  • Mains power: 115 VAC/230VAC 50 Hz or 60 Hz
  • Average current: 0.3 A @ 115 VAC, , 0.15 A @ 230 VAC
  • Maximum current: 0.4 A @ 115 VAC, , 0.2 A @ 230 VAC
  • Power load: 45 W
  • Enclosure: IP65
  • Data presentation: 6-hour graph (14-day scrollable); current value with 5-digit resolution
  • Data storage: 10 days in RAM; 90 days with disk drive (data interval 2 minutes)
  • Analog output: 0 - 20 mA or 4 - 20 mA selectable, electrically isolated load max 500 ohm
  • Process Buoy: 830 x 130mm (length x diameter); approx. 10.8 kg (filled)
  • Controller: 264 x 360 x 345 mm (W x H x D); 12.0 kg
multiparameter transmitter
  • In-situ operation
  • Auto Calibrating
  • Auto Cleaning
  • No sample preparation needed
  • Sensor electrode only sensitive to Ammonia - not affected by Chloride
  • Low installation costs
  • Low maintenance costs -  low and predictable "Totex"
PBS manual

PBS1 Brochure

Click on the image to download the 3-page PBS1 brochure

Or contact us for more information

  • Format: PDF
  • Filesize: 511KB
Download PBS brochure

Quote REQ


Click on the image to open a quote request form for the PBS ammonia monitor

Or contact us for more information on our range of online analyzers

PBS manual

PBS1 Manual

Click on the image to download the PBS1 manual

Or contact us for more information

  • Format: PDF
  • Filesize: 3MB

case Studies


Click on the image to link to the Effluent Compliance Case Studies page

Or contact us for more information on our range of analysers