Programmable Sensor

A complement to any room, the Reliable Controls SMART‑Sensor™ Electronic Paper Display (EPD) delivers a modern networked-sensor solution that allows you to connect with up to 10 configurable parameters related to your space.

Purchase Products


Aesthetic Design

  • Slim profile.
  • Installs into standard electrical box.

Multiple Screen Styles

  • Home screen for default space conditions.
  • List screen for viewing all programmed objects.
  • Accessibility screen displays all values and state icons in large format.

Easy Programming

  • 10 programmable objects, such as inputs, outputs, or values.
  • Object values can be programmed for adjustment by the user or as display only.
  • Objects can be configured to display on the home screen.
  • Icons for display: On, Off, Auto, Manual, Cool, Heat, Occupancy, Fan, and Fan Speed.
  • Up to seven objects can be displayed simultaneously.

Connection and Addressing

  • Configure network address using customized button combination.
  • Valid addresses are 1–16.
  • Four-wire connection.

Built-In Configuration Tools

  • User-enabled configuration tools allow access to MSet Tool, Flow Tool, and Diagnostics Tool.

Language Library

  • The SMART-Sensor EPD hosts an onboard language library that contains over 90 common industry words and phrases in seven languages. Users can select from the following:  
  • English.
  • French.
  • Spanish.
  • Portuguese.
  • German.
  • Italian.
  • Simplified Chinese.

Optional Front Light

  • EPD screen glows faintly in low light or night conditions while in use, then turns off after 10 seconds of inactivity.

Optional Inputs

  • CO2 sensor.
  • Humidity sensor.
  • IO: Two inputs and two outputs.
  • Occupancy sensor.
  • VOC sensor. Must be ordered with humidity sensor option.


  • 5 years.


  • CE.
  • FCC CFR 47 Part 15 Class B.
  • ICES-3 (B).
  • UL 916 Listed.
  • WEEE.
RoHS 2 Certified

Tech Specs

Supply Voltages from Controller

  • Base model consumes 5 VDC @ 15 mA.
  • -CO2 option adds 10 mA.
  • -FL option adds 4 mA.
  • -IO option adds 10 mA.
  • -OC option adds 0.2 mA.
  • -V option adds 20 mA.

Temperature Specifications

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


  • 200 x 200 pixels.
  • 23 x 23 mm (15/16” x 15/16”).
  • Black and white.

Language Support

  • Supports seven languages.

CO2 Sensor for -CO2 Models

  • Automatic background calibration period of 8 days.
  • Nondispersive infrared (NDIR) sensor.
  • 0–3,276 ppm range.
  • Accuracy ±50 ppm.
  • Nonlinearity < 1% of full scale.
  • Power: Adds 10 mA to the base model.

Front Light for -FL models

  • White LED front light adds 4 mA.

Humidity Sensor for -H Models

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


  • Dedicated temperature sensor.
  • Two thermistor or dry contact inputs for IO models.

Outputs for -IO Models

  • Two digital MOSFET relays.
  • 24 VAC @ 0.5 A.

Occupancy Sensor for -OC Models

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

VOC Sensor for -V Models

  • 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 to 2,008 ppb).
    • 6 ppb (2,008–11,110 ppb).
    • 32 ppb (11,111–32,767 ppb).
  • Power: Adds 20 mA to the base model.

Wiring Terminals

  • 14–26 AWG (2.08–0.13 mm2).
  • Stranded or solid core.
  • Copper conductors only.


  • Base model: 12 cm L x 7 cm W x 1.9 cm H
    (4 3/4" L x 2 3/4" W x 3/4" H).
  • CO2 model: 12 cm L x 7 cm W x 2.5 cm H
    (4 3/4" L x 2 3/4" W x 1" H).


  • 0.086 kg (0.19 lb.).

Ambient Limits

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

Application Diagram

Expansion Modules

SMART-Sensor™ Expansion Board
For SMART-Net devices that use modular RJ11 connections, the Reliable Controls SMART-Sensor Expansion Board maximizes both the number of SMART-Sensor devices you can use and the combined SMART-Net cable length you can connect to a host controller.

Screen Captures


SS3 Backplate Extender Extended convenience
The aesthetically designed Reliable Controls SPACE-Sensor Temperature (SST3) series and SMART-Sensor (SS3) series can be mounted to an extender plate (SS3-EP) to avoid drilling holes in a wall. The backplate extender displaces the sensor off the wall so that it avoids a hole being made for connectors on the SST3 and SS3.
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. Designed to fit and cover single-device electrical boxes.