We have gone over the best practices for selecting a unidirectional and a bidirectional differential pressure transducer based on usage and application. So why should you use a unidirectional differential pressure transducer over a bidirectional model for an isolation room? When requiring an increased accuracy reading for positive and negative pressure, it is best to use a unidirectional transducer. For positive pressurized rooms, you can place the low port on the reference area and the high port on the room of concern. For negative pressurized rooms, you place the low port on the negative pressure room of concern and the high port on the pressure reference area.
To avoid contaminants escaping the room of concern, it is important to have a differential pressure transducer with high accuracy. A unidirectional differential transducer provides an increased accuracy reading compared to a bidirectional differential transducer because it represents double the full span for the transducer range. Since the unidirectional differential transducer diaphragm deflects up to half the full span of a bidirectional unit, it provides for a better accuracy measurement. With higher accuracy levels, you can ensure that the reading you receive from the transducer is as accurate as possible.
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