Innova Mass Flow Switch

Sierra Instruments’ Innova-Switch represents the State-of-the-art in gaseous and liquid flow switching or liquid level control and continues the Sierra tradition of providing the highest quality mass flow meters and controllers in the industry.

Flow and level detection is accomplished by using a high-resolution thermal differential technique. The sensor consists of a pair of matched Resistance Temperature Detectors (RTD’s). One RTD is self-heated using a constant DC current. The other RTD is unheated and provides an accurate process temperature reference. The thermal differential created between the reference and

the heated RTD pair is a function of the density and/or velocity of the media with which the sensor is in contact.

The sensor and wetted parts are of durable 316L stainless steel, all welded construction with no moving parts. The switch is easy to install and adjust, giving reliable, low maintenance performance in the most demanding applications. 


  • Mass flow Switch for the detection of the mass flow rate of liquids and gases 
  • Point level switch for liquid level detection 
  • Wide operating temperature range -100o F to +850o F (-70o C to 458o C) 
  • Flow Switch range of 0.01 to 5 fps liquids and 0.1 to 500 fps gases 
  • Level Switch switches on level change 0.03 inch 
  • Fast flow switch response time of 0.5 to 10 seconds (media dependent) 
  • Level switch response time of 0.1 to 1 second of wetting (media dependent) 
  • CE, CENELEC and CSA approvals