SPACE-Sensor Temperature
Temperature Sensor

Aesthetically designed to complement any decor, the Reliable Controls® SPACE-Sensor Temperature (SST3) series provides a traditional temperature sensor solution and a wide array of options to help you achieve comfort.

Purchase Products


Aesthetic Design

  • Slim profile.
  • Installs into standard electrical box.

Space Sensing

  • Temperature.
  • CO2.
  • Occupancy.
  • Humidity.

User Access and Adjust

  • Setpoint adjust using Up and Down buttons or slider.
  • Momentary contact override center button.
  • LED option for status.

Combine two inputs into one

  • On the -O and –UD models, the buttons are momentary, and short and open the thermistor circuit. Control Basic SENSOR-ON and SENSOR-OFF commands are used to detect button use.


  • 5 years.
RoHS 2 Certified

Tech Specs

Supply Voltage

  • No external power required except for -CO2, -H and -OC models.
  • 24VAC ±15% 50/60 Hz or 9-24VDC ±15%.
  • CO2 option adds 1VA (1.2 W).
  • H option adds 0.1VA (0.1 W).
  • OC option adds 0.1VA (0.1 W).


  • Dedicated 10k thermistor onboard.
  • Range: -20 °C to 55 °C (-4 °F to 131 °F).
  • Sensor accuracy: ± 0.2 °C (0.36 °F) over range.

CO2 Sensor (for -CO2 models)

  • Automatic background calibration period of 8 days
  • Non dispersive infrared optical sensor.
  • 0-2000 ppm range (0-5V).
  • Accuracy ±50 ppm.
  • Non Linearity < 1% of full scale.

Occupancy Sensor Specifications (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.

Humidity Sensor (for -H models)

  • 0.1% display resolution.
  • 0-100% range.
  • Accuracy ±2.4%RH max from 0 to 90% (see plot).

Optional LED

  • LED indicator.

Optional Override Button

  • Use to override unoccupied mode.

Optional Up/Down Buttons

  • Use up/down buttons to adjust setpoint.

Optional Setpoint Slider

  • 10K slide pot.

Wiring Terminals

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


  • Base model:
    12 cm L x 7 cm W x 1 cm H (4 3/4" L x 2 3/4" W x 3/4" H) *Height dimension is proud from wall surface.


  • 0.055 kg (0.121 lb.).

Ambient Limits

  • Operating: -20 °C to 55 °C (-4 °F to 131 °F).
  • Shipping: -40 °C to 60 °C (-40 °F to 140 °F).
  • Humidity: 10% to 90% RH non-condensing, recommended.

Application Diagram


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.