PTV 1000 in a membrane treatment setting

Membrane filtrate turbidity monitoring

Track low-level turbidity in filtrate alongside the plant’s membrane monitoring programme.

Measure at the scale you can act on

Sampling one train makes the signal useful for investigating that train. Sampling the common header is more appropriate when the question is about the combined filtrate leaving the process. Record which trains contributed to the header at the time of a change.

Check which train is in service and whether its sample line is carrying fresh filtrate. Record cleaning and restart events, sample flow and the optical method so a later comparison is based on similar operating conditions.

PTV 1000 installed near a membrane train

Compare operating states before interpreting a shift

The example shows a change that persists after a train returns. Review it alongside train status, sample conditions and the plant’s integrity monitoring records.

Illustrative readings in FNU. This example is provided for interpretation practice.

Train returns to service at minute 4

View example readings

Illustrative data
Minute	Turbidity (FNU)
0	0.023
2	0.025
4	0.023
6	0.029
8	0.070
10	0.071
12	0.065
14	0.064
16	0.061
18	0.059

Read turbidity alongside integrity and operating records

A change in filtrate turbidity can prompt a closer look. Review the trend with the plant’s integrity checks, the production rate and recent cleaning or restart activity. These records help the team work out which event to investigate first.

Agree who reviews an excursion and which records they should see. If the change coincides with a stopped train or a sample line intervention, confirm that the analyser is receiving representative water before comparing it with a running baseline.