Online Ammonia PBS

PBS online ammonia monitoring

ammonia monitor

PBS1 transmitter

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 deployed in an aeration lane

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

brochure for online ammonia monitor Download PBS brochure quote for online ammonia Quote for PBS  |  Request Manual

pbs online ammonia

Features and Benefits

  • In-situ operation
  • Auto Calibrating
  • Auto Cleaning
  • No sample preparation needed
  • Sensor electrode only sensitive to ammonia
  • Low installation costs
  • Analyser checks itself routinely
  • Low maintenance
  • The PBS has low and predictable "Totex"
  • Electrode not affected by chloride


Activated sludge monitoring & control ammonia monitoring

Final effluent online ammonia monitoring



NH4 Measurement

  • Measuring ranges (mg/L NH4 – N): 0.1 – >50
  • Detection Limit: 0.1 mg/l
  • Reproducibility: 3%
  • Reagent consumption: 0.6 litre/month (average)
  • T90 time: 3 - 5 minutes

Electrical and standards conformity

  • Probe power: 15/24 V from controller
  • 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
  • Protection class: 1 (per IEC 4010)
  • Immunity to voltage change: EN 50022
  • EMC emission: EN 50081-1, 12/96
  • EMC noise immunity: EN 50082-2, 12/96
  • Certification: CE Mark (Declaration of conformity)
  • Test method: per DIN/VDE 0701

Dimensions and weights:

  • 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




Data display, inputs and outputs

  • Display: LCD graphics display, 16 lines by 40 characters, backlit
  • Keypad: 21 key, 13 x 13 mm
  • 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)
  • Logging of warnings, malfunctions, limit value alarms and calibrations for last 4 weeks (90 days with disk drive)
  • Analog output: 0 - 20 mA or 4 - 20 mA selectable, electrically isolated load max 500 ohm
  • Limit value alarms: 4 x Dry contact relay (normally closed) for user-definable alarms
  • Disk drive: PC-compatible 3.5" disk drive for data storage in CSV format