NDD EasyOne-CS, Field Service Manual, Page: 5 / 36

2030434-006 Rev. E EasyOne-CS Field Service Manual Page 3
1 Manual Purpose
This manual supplies technical information for service representative and technical personnel so they
can maintain the equipment to the assembly level. Use it as a guide for maintenance and electrical
repairs considered field repairable. Where necessary the manual identifies additional sources of
relevant information and or technical assistance.
See the operator manual for the instructions necessary to operate the equipment safely in accordance
with its function and intended use.
2 Intended Audience
This manual is intended for the person who uses, maintains, or troubleshoots this equipment.
3 Introduction
The EasyOne-CS Spirometer uses digital ultrasonic flow measurement technology for fast, accurate,
reliable operation. The EasyOne-CS was designed for full range testing in primary care, specialty
physician, industrial and hospital settings. It offers automated comparison to predicted values, pre-
and post Broncho Dilator comparisons, interpretation of results and test quality control that
automatically assesses patient effort offering helpful suggestions to obtain optimum results. Optional
easy to read and interpret color printout with graphic display for instant test review is available. The
single-patient-use spirette minimizes risk of cross-infection.
4 Operation Principle
This EasyOne-CS flow sensor is equipped with two ultrasonic transducers, mounted at different sides of
the flow channel. In order to determine gas flow (and molar mass), ultrasonic pulses are transmitted in
up- and downstream direction. Precisely measured transit-times are the basis for determining flow and
molar mass. The following figure shows a diagram of the flow sensor including its internal sound
transmission path.
Figure 1: Schematic of EasyOne-CS flow sensor