740 Portable

Portable Suspended Solids Monitoring

The 740 Monitor provides, quick and accurate readings of Suspended Solids, Sludge Blanket Level, and Turbidity, via an intuitive menu structure from a totally portable package. The robust IP65 enclosure incorporates a security strap and protective case to prevent accidental dropping, impact damage and abrasion of the display surface. The display itself is a high contrast LCD that has been designed to work over a wide temperature range with no loss of clarity. A rugged carrying case holds the above, together with the measuring probe, cable, battery charger and instruction manual.

The 740 Monitor includes capability for up to ten customer programmed user profiles, each defined by site specific calibrations to cater for differences in the effluents being monitored. A retrospective adjustment to the calibration for each site is also possible via a unique menu facility that enables a specific sensor output to be stored in memory at the same time as a liquid sample is taken. The gravimetric analysis of the suspended solids level in the sample is then returned to the monitor as the final calibration figure. Further site calibration enhancement is afforded by the ten-point look up table, that allows the monitor to accurately measure suspended solids in vast majority of applications.

The achievable accuracy and ease of use make the 740 Portable ideal for regular checking of suspended solids levels to process or legislated requirements in activated sludge plants, final effluent outfalls, treatment plant inlets, streams and rivers and as a secondary standard to check other on-line and portable instruments.


  • Mixed Liquor
  • Returned Activated Sludge
  • Final Effluent


  • Multiple Site Configurations
  • Low Cost of Ownership
  • Large Sample Volume

Technical Specification


Dimensions (HxWxD)Monitor: 224 x 106 x 39 mm
Sensor: 45 mm Diameter, 155 mm long
WeightMonitor: 0.5 kg
Sensor: 0.6 kg (inc 5 metres of cable)
Protection ClassElectronics IP65, Sensor IP68
Enclosure MaterialMonitor: ABS
Sensor: Black Acetal Co-Polymer
Cable EntriesPlug for Sensor and Charger
Cable Size5 mm OD
Cable Length5 metres standard, 100 metres maximum


Power SupplyRechargeble Battery
Charger90-264 VAC, UK, EU and US plug style available
Optional Car Charger available

Environmental Data

Operating Temperature Monitor -20 to 60ºC, Sensor 0-60ºC
Storage Temperature -20 to 60ºC
Location Portable

Measurement Principle

PrincipleInfrared Light Attnenuation
Wavelength880 nm

Measurement Characteristics

Response Time0.5 seconds, damping configurable in monitor
Accuracy+/- 5% Reading on real sample
Repeatability+/- 1% Reading on real sample
Pressure Rating10 mWC
Maximum Range0-20,000 mg/l
Minimum Range0-200 mg/l

User Interface

DisplayGraphical Display providing 4 1/2 Digits with 2 message lines
Setupvia 6 button keypad
Units of Measurementmg/l, g/l, ppm, NTU, FTU, %SS
Information to Download
Measurement Links