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| Overview

The Multi Sensor is latest sensor that is introduced into the 75F's portfolio of sensors, which sense additional parameters other than temperature and humidity.

The SmartNode has capabilities for /IAQ (CO2) and occupancy-based energy sequences, but the current wall sensors that is being used, do not provide all the required sensing capabilities for necessary inputs. 

The Multi Sensor which is a wired sensor that can be used with the SmartNode solves the problem and can sense and provide the required parameter inputs to the SmartNode, to trigger IAQ (CO2) and occupancy-based energy sequences like the AutoAway and Auto Forced Occupied

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It augments the SmartNode to add full Title 24 compliance. In addition to comfort (temperature/humidity).

| How It Works

The Multi Sensor is an all-in-one sensor that measures Temperature, Humidity, CO2 and Occupancy. This sensor addition allows 75F to offer out of the box HVAC control sequences to meet the exacting demands of California's Title 24 energy code.

| Features

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  • It measures temperature and humidity measurement with an accuracy of +- 0.5C and 3% RH.  
  • It has occupancy sensing for targets within 10m distance and 100 angle (ideal 180 deg). Ideally the range sensitivity is adjustable to suppress overlapping coverage.
  • Ceiling Mount: accurately senses a motion at 4m height and 100deg angle. This means it would cover 10sq ft on the floor.  
  • CO2 sensitivity and accuracy meets the title 24 requirements.
  • It powers and communicates over the low power sensor harness cable and can be daisy chained with other devices on the bus
  • It is considered to be a terminal device on the bus, so it has fixed reflection dampening resistors.
  • It has the capability to daisy chain and power and communicate in a bus.

| Mounting

It is easily mounted on a wall by a single toggle bolt.

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| Wiring

The sensor plugs into the standard 3wire sensor bus that 75F offers on its Nodes and Stats.

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The modern low profile design appeal to architect aesthetics and allows the sensors to blend in with office environments. 

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The 3 Pin connector connects to the sensor as shown below

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With its daisy chaining capability, the Multi Sensor uses a 3 Wire Daisy Chain Adapter as below to connect more devices in the bus.

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The Daisy chain connector connects to the sensor as shown below.

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Combining the daisy chain adapter and 3 Pin to 3 Pin cable of lengths 18 inch, 20, 30 and 50 feet, the daisy chaining of multi sensors to a SmartNode can be achieved as below.

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When Daisy Chained

  • Not more than 4 Multi Sensor can be daisy chained.
  • The temperature and CO2 to the master is average of the values from all the Multi sensors
  • The occupancy detection for the master device is when occupancy is detected at least by one Multi Sensor in the bus.

For more information on Daisy Chaining refer to Daisy Chaining Capabilities of Sensors

| Other Capabilities

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When the top cover is removed, the Multi Sensor provides the user with additional capabilities.

  • At 1 it is a reset button to reset the sensor.
  • At 2 it is a device address setting two dip switches to set the address for the device when more than one multi sensor is installed in a bus.

Below is a table that explains how to set a different address for the multi sensors in the same bus.

Device Number Multi Sensor DIP Switches Positions Dip Switch Position
Top DIP Switch Bottom DIP Switch

1

0 – (OFF - Left side)

0 - (OFF – Left Side)

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2

0 – (OFF – Left Side)

1 – (ON – Right Side)

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3

1 – (ON – Right Side)

0 – (OFF – Left Side)

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4

1 – (ON – Right Side)

1 – (ON – Right Side)

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  • At 3 it is a switch to set the senor as a daisy chained device or the terminal device in the bus.
  • At 4 is switch that allow the user, to set the SmartNode which is connected to the Multi Sensor in to pairing mode, without having to access the actual SmartNode which is installed at the plenum in the building. This can avoid the need to reach the SmartNode to set it to pairing mode.
  • The Pair button will have to be pressed for between 3 to 6 seconds, to set the SmartNode to pairing mode.

 

 

 

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