The OW-DP-001 from Wireless Sensors LLC, Portsmouth, NH, is a modular differential pressure sensor that connects to the company's SensiNet wireless nodes. The sensor module conforms to the company's OneWire daisy-chain protocol and allows you to collect pressure data that, when combined with temperature measurements, can help you understand the efficiency of your cooling system. The module connects via Cat 5 patch cable to the RF transmitter box.
Differential Pressure Sensor from Wireless Sensors
Wireless Sensors LLC