SR710S Sensor

NIR Coat-Weight Measurement Sensor for the Coating and Converting Industry

NIR Coat-Weight Measurement Sensor


The SR710S near-infrared (NIR) coat-weight measurement sensor is specifically designed to meet the needs of the converting industry for measuring the coat-weight thickness of coatings and laminates. Using NIR, non-contact technology, the SR710S is suitable for many types of continuous processes and provides real-time measurements that can be used to control processes, monitor product quality and warn operators if the process is moving out of specification, thereby increasing yield and improving quality. Using this on-line sensor improves process efficiency and results in substantial cost reductions and investment payback in a matter of months.

Operating Principle

The SR710S NIR coat-weight measurement sensor works on the principle that water and organic products, such as coatings, absorb NIR light at specific wavelengths. When exposed to NIR light, a product will absorb a proportion of this energy depending on the active constituent that is present. By pulsing light at a different known wavelength, the sensor compares the absorption rate to an internal reference, thus making it possible to determine exactly by how much each wavelength is being absorbed. Using high-speed signal processing, the algorithm converts the IR signals into an output that is proportional to coat-weight thickness by means of a calibration curve. The measurement is unaffected by changes in process conditions such as particle size, product height temperature, ambient lighting and humidity changes.


  • PSA labelstock coating
  • Tapes
  • Coated paper and film
  • Laminates
  • Thermal lamination films
  • Solar films
  • PVDC coating
  • Lacquer on aluminium foil
  • Flexible packaging
  • Poly coating

NDC Technologies Experience

NDC Technologies have nearly 40 years of experience in applying NIR technology to their in-process measurement systems. This experience is engineered into every gauge model to ensure that the user can easily employ the gauges without specialist knowledge yet will benefit from the accurate and dependable measurement from day one.

Stable Dependable Measurement

Providing stable measurement is essential in helping our customers improve their process control and maximise efficiency.

Insensitive to Ambient Humidity and Temperature

Designed for purpose and suitable for continuous in-line measurement in harsh industrial applications.

Fast Measurement Rate

Fast measurement rate enables fast process variations to be accurately monitored ensuring the best possible process control.

Network Ready

Installing single or multiple gauges is very simple with OWS operator level workstation and HMI for supervisory access for up to 16 networked gauges.

Low Cost of Ownership

Long term stability combined with industry best performance, low installation costs and no routine maintenance requirements guarantee the lowest cost of ownership.