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| Overview

The Intelligent-Ceiling Temperature and Humidity Sensor (CTH) adds a high-precision temperature and humidity sensor pre-calibrated from the factory.

| How It Works

The CTH uses a proprietary 1-wire protocol to communicate with a master device such as SmartNode, SmartStat, or HyperStat.

| Features

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  • Temperature (typical +/-0.2C) 
  • Humidity (typical +/- 2% R.H.)
  • 3-wire interface for power and communication

| Mounting

The CTH mounts on a ceiling by a threaded bush.

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The module drop is adjusted with a set screw. 

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Installed Sensor 

 

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| Wiring

 The sensor plugs into the standard 3wire sensor bus that 75F offers on its Nodes and Stats using the 3 Pin to 3 Pin cable of lengths 18 inches, 20, 30, and 50 feet, as shown below.

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In principle, the CTH can be daisy-chained with other sensors on the 1-wire bus to provide an extensible sensor network.

With its capability to be a part of the daisy chain, combining it with other sensors in the bus, using the daisy chain adapter, and with 3 Pin to 3 Pin cable of lengths 18 inches, 20, 30, and 50 feet, the Ceiling Sensor can be made a part of the Daisy Chain as Below.

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When Daisy Chained

  • Not more than 1 Ceiling Sensor can be daisy chained in the bus, due to the absence of an address setting mechanism.
  • The Temperature and Humidity values of the sensors in the bus are averaged for the master device

For more information on the Daisy Chaining capability, refer to Daisy Chaining Capabilities of Sensors

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