Programmable Sensor

A complement to any room, the Reliable Controls SMART‑Sensor™ delivers a modern communicating‑sensor solution that allows you to connect with up to 10 configurable parameters related to your space.

Purchase Products

Product features

Aesthetic Design

  • Slim profile with thin backplate.
  • Standard model is designed to install into rectangular electrical boxes used in North America.
  • Square model is designed to install into square or circular electrical boxes used in Europe, Southeast Asia, and other regions.

Easy Programming

  • 10 programmable objects, such as inputs, outputs, and values.
  • Program setpoint or override values for user adjustment.

Connection and Addressing

  • Configure network address using four-pole DIP switch.
  • Valid addresses are 1–16.
  • Four-wire connection.

Onboard Temperature Sensor

  • Dedicated 10 kΩ thermistor.

Order Options

  • CO2 sensor.
  • Humidity sensor.
  • Two inputs and two outputs.
  • Override button with position LED.
  • Occupancy sensor.
  • Setpoint slider.
  • Up/down buttons. The SMART-Sensor does not support both up/down buttons and setpoint slider together.
  • VOC sensor. Must be ordered with humidity sensor option.
  • Particulate matter sensor.
  • Jack option. Adds micro-USB connector and required network terminations to allow local access to the host controller using an X‑Port‑2 Converter with additional custom cables. Cannot be ordered on devices with both an occupancy sensor and a setpoint slider.

Status LED

  • Status LED indicates device connection to the SMART‑Net network or incoming configuration changes.


  • 5 years.
RoHS 3 Certified

Technical specifications

Current Consumption from Controller

  • Base model consumes 15 mA at 5 VDC.
  • -CO2 option adds 20 mA.
  • -IO option adds 10 mA.
  • -OC option adds 0.2 mA.
  • -V option adds 20 mA.
  • -PM option adds 35 mA.

Temperature Specifications

  • 12-bit A/D converter.
  • User calibrated to ±0.1°C (0.18°F) accuracy.
  • Onboard thermistor: 0°C to 50°C (32°F to 122°F).
  • Thermistor input: –40°C to 120°C (–40°F to 250°F).

CO2 Sensor (-CO2 Option)

  • Automatic background calibration period of 8 days.
  • Single-beam nondispersive infrared sensor.
  • 0–3,276 ppm range.
  • Accuracy ±40 ppm.
  • Nonlinearity <1% of full scale.

Humidity Sensor (-H Option)

  • 0.1% display resolution.
  • 0%–100% range.
  • Accuracy ±2.4% maximum from 0%–90%.

Inputs and Outputs (-IO Option)

  • Two thermistor or dry-contact inputs on devices with the ‑IO option. Only one input is available on models with the ‑V option. Only one output is available on models with the -PM option.
  • Supports 10 K type III thermistor only (0°C/32°F=29.49 kΩ).
  • Two solid-state relay outputs that switch 24 VAC/VDC at 500 mA maximum.

Occupancy Sensor (-OC Option)

  • Passive infrared radiation sensor.
  • 64 detection zones.
  • 94° horizontal range/82° vertical range.
  • 5 m (16.4 ft) maximum detection distance.

Override Button (-O Option)

  • Low-profile, tactile on/off switch with LED.

Setpoint Slider (-S Option)

  • 10 kΩ linear potentiometer.

VOC Sensor (-V Option)

  • Automatic background calibration.
  • Heated metal oxide sensor.
  • 0-32,767 ppb range.
  • Indoor air quality applications.
  • Accuracy:
    • Typically 25% of measured value.
    • Maximum 50% of measured value.
  • Resolution:
    • 1 ppb (0–2,008 ppb).
    • 6 ppb (2,009–11,110 ppb).
    • 32 ppb (11,111–32,767 ppb).

Particulate Matter Sensor (-PM Option)

  • Laser scattering particulate matter sensor.
  • PM2.5 measures particles 0.3 to 2.5 µg.
  • PM10 measures particles 0.3 to 10 µg.
  • Sensing range 0–1000 µg/m3.
  • Accuracy at 25°C (77°F) 50% RH.
    • ±5 µg/m3 at 0–100 µg/m3.
    • ±10% of measured value at 100–1000 µg/m3.
  • Fan sampling method.
  • Maximum three sensors connected in a line connection.

Up/Down Buttons (-UD Option)

  • Vertical up/down buttons to adjust setpoint.
  • Cannot be ordered with -S option.

Micro-USB Connector (-J Option)

  • Micro-USB connector and required network terminations to allow local access to the host controller using an X‑Port‑2 Converter with additional custom cables. Provides two-pin connections to the host controller's MS/TP network.
  • Cannot be ordered with devices that combine the ‑OC and ‑S options.
  • Requires CC‑MULTI‑XP2 cable accessory to connect the X‑Port‑2 Converter to the micro‑USB connector.

Wiring Terminals

  • 14–24 AWG (2.08–0.20 mm2).
  • Stranded or solid core.
  • Copper conductors only.
  • Low capacitance <82 pF/m (25 pF/f).


  • Standard model:

    12 cm L x 7 cm W x 1 cm H

    (4 3/4" L x 2 3/4" W x 3/8" H).

  • Standard model with CO2 sensor:

    12 cm L x 7 cm W x 2.5 cm H

    (4 3/4" L x 2 3/4" W x 1" H).

  • Standard model with SS3 Deep Backplate accessory*: 

    12.2 cm L x 7.2 cm W x 3.4 cm H

    (4 13/16" L x 2 13/16" W x 1 5/16" H).

  • Square model:

    9.2 cm L x 9.2 cm W x 1 cm H

    (3 5/8" L x 3 5/8" W x 3/8").

  • Square model with SS3 Deep Backplate accessory**:

    9.4 cm L x 9.4 cm W x 3.4 cm H

    (3 11/16" L x 3 11/16" W x 1 5/16" H).

*Standard model devices with particulate matter sensor include the SS3 Deep Backplate.

**Square model devices with CO2 or particulate matter sensor include the SS3 Deep Backplate.


  • 0.086 kg (0.19 lb).

Ambient Limits

  • Operating: 0°C to 50°C (32°F to 122°F).
  • Shipping: –25°C to 60°C (–13°F to 140°F).
  • Humidity: 10%–90% RH noncondensing.

Mounting Hardware Included

  • Standard model ships with two 6-32 1" truss head Phillips mounting screws.
  • Square model ships with two M3.5 25 mm Phillips mounting screws.


  • CE.
  • FCC CFR 47 Part 15 Class B.
  • ICES-3 (B).
  • UL 916 Listed.
  • WEEE.


SS3 Deep Backplate  Backplate Extender
The SS3 Deep Backplate is an accessory for SMART-Sensor™ and SPACE-Sensor™ Temperature devices that facilitates surface mounting without the need to cut an opening in the wall. The SS3 Deep Backplate is ideal for gas-sensing models and for installations on concrete or other solid surfaces. Available in standard and square models, the SS3 Deep Backplate is designed to fit and cover single-device electrical boxes.