The ANALITE NEP-495 turbidity probes can monitor and log turbidity and temperature in a sturdy self-contained package that is easy to set up and selectively, easy to download the data collected. The NEP-495 is designed for deployment in natural underwater environments including those where metal based probes may corrode.


Product Description

NEP-495 Turbidity Logging probe

The ANALITE NEP-495 microprocessor based turbidity probe is designed for monitoring and logging applications where turbidity levels of up to 3,000NTU may be encountered. The ANALITE NEP-495 probe, with its integral wiper assembly, is designed to operate over an extended period of time where bio- fouling or sedimentation build-up is likely to be encountered. The ANALITE NEP-495 Turbidity Logging probe may be submerged to a depth rating of 100 meters (approx. 330 feet).

The ANALITE NEP-495 Turbidity Logging probe use 90° optics and employs infrared light in accordance with ISO7027 and use a unique modulation technique that ensures almost total rejection of ambient light conditions.

The user may calibrate the probe at any time via the USB interface and PC software.

The ANALITE NEP-495 Turbidity Logging probe is similar to the ANALITE NEP-395 probe but with the inclusion of temperature measurement and a flexible self- contained logging function. As normally supplied, the ANALITE NEP-495 can store over 30,000 data sets with each data set consisting of turbidity, temperature, time and date. Logging intervals can be set from less than 1 second to over 18 hours. Data is stored in non- volatile memory.

The ANALITE NEP-495 is self-contained requiring no external power or commands once logging has commenced. The internal batteries have a life expectancy of over 30,000 data sets or about 60 days (whichever comes first), assuming a wipe prior to each reading.

Technical specs


  • 90° modulated infra-red (ISO7027)

  •  40, 100, 400, 1,000, 3,000 and 5,000NTU – range selection set by user


  • ±1% at 25°C

  • RS232 – 1200, 2400, 4800 or 9600BPS, 7 data bits, even parity, one stop bit. The factory default setting is 9600BPS

  • Latest turbidity measurement
  • Mean and Sample Variance
  • Median
  • Maximum
    Probe battery voltage
  • External (water) temperature
  • Turbidity 2-point or 3-point calibration for each range. May be set by the user only through the RS232 interface and for the range selected. Can revert back to factory calibration settings after user calibration.
  • Temperature – factory calibration only.


  • 3 off – C cells alkaline 0.5mA standby: 15mA ON.
  • 40mA ON and wiping.

RS232 Logging:

Each logging point generates a data set containing:

  • Turbidity in NTU
  • Water Temperature in °C
  • Data set recorded Time
  • Data set recorded Date


  • User set, from 1 second to over 18 hours in 1 second increments. Factory set to 900 seconds (15 mins).

Data Capacity:

  • 32,000 data sets minimum but depends on memory capacity installed in the probe.
  • Memory technology is Flash RAM. Logging stops when memory is full.

Interface Cable:

  • USB Cable.

Depth Rating:

  • 100m (330ft) static water column


  • 1.5kg – including batteries
  • 3kg – shipping including carry tube
  • Acetyl copolymer casing. Screw on end cap to allow battery replacement and PC connection via USB interface cable.


  • 540mm long overall nom., 45mm diameter



Download NEP-495 Datasheet
Download NEP-495 Manual


See More

NEP-495 Accessories 

Product Features

Field, Process & Lab Application

NEP-495 Probes typical use include applications such as:

  1. Monitoring of streams and rivers.
  2. Monitoring of water storage bodies including stratification studies.
  3. Intermediate and final effluent treatment monitoring.
  4. Environmental impact studies.
  5. Hydrological run off studies.
  6. Ground and bore water analysis.
  7. Water filtration efficiency.
  8. Industrial process monitoring.
  9. Sludge and dredge monitoring.


You may also like…