Micro-flow sensor for water using NTC thick film segmented thermistors

Abstract

Purpose - The purpose of this paper is to apply negative thermal coefficient (NTC) thick film segmented thermistors (TFSTs) in a micro-flow sensor for water. Design/methodology/approach - A TFST is printed using NTC paste based on nickel manganite. The resistance of this thermistor is measured in a climatic chamber and the resulting curves are calibrated. A micro-flow sensor is designed using a self-heated segmented thermistor. The sensing principle is based on heat loss depending on the water flow intensity through the capillary. Water flow calibration is performed. The sensor sensitivity, inertia, and stability are analyzed. Findings - The micro-flow sensor exhibits good stability, suitable sensitivity and inertia for integral measurements of water flow. Practical implications - Advantages of a micro-flow sensor using a TFST include low energy consumption, simple measuring procedure, and passive electronics. Originality/value - This paper describes initial work on a micro-flow sensor for water using TFSTs.