SPACE-Sensor Temperature
Temperature Sensor

Aesthetically designed to complement any decor, the Reliable Controls SPACE‑Sensor™ Temperature provides a traditional temperature sensor solution with a wide range of options to help you achieve comfort.

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.

Order Options.

  • CO2 sensor.
  • Humidity sensor.
  • Occupancy sensor.
  • LED indicator.
  • Override button.
  • Setpoint slider.
  • Up/down buttons.
  • 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.

Access and Adjustment

  • Setpoint adjustment using up/down buttons or slider.
  • Momentary contact override button.
  • Optional LED for status indication.

Combinable Inputs

  • On devices with the -O and -UD options, the buttons temporarily open or short the thermistor circuit.
  • Use Control-BASIC SENSOR-ON and SENSOR-OFF to code button functions.


  • 5 years.
RoHS 3 Certified

Technical specifications

Supply Voltages

  • No external power required except on devices with the ‑CO2, ‑H, and ‑OC options.
  • 24 VAC ±15%, 50/60 Hz or 9–24 VDC ±15%.
  • -CO2 option adds 1 VA (1.2 W).
  • -H option adds 0.1 VA (0.1 W).
  • -OC option adds 0.1 VA (0.1 W).

Temperature Sensor

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

CO2 Sensor (-CO2 Option)

  • Automatic calibration period of 8 days.
  • Nondispersive infrared optical sensor.
  • 0–2,000 ppm range (0–5 V).
  • Accuracy ±50 ppm.
  • Nonlinearity <1% of full scale

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.

Humidity Sensor (-H Option)

  • 0.1% display resolution.
  • 0%-100% range (0-5 V).
  • Accuracy ±2.4% maximum from 0%–90%. See plot.

LED (-L Option)

  • LED indicator.

Override Button (-O Option)

  • Momentary contact push button.

Up/Down Buttons (-UD Option)

  • Up/down momentary buttons.

Setpoint Slider (-S Option)

  • 10 KΩ slide potentiometer.

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 for the host controller's SMART-Net +5 terminal, SMART-Net ground terminal, and MS/TP network.
  • Cannot be ordered with devices that combine the ‑OC and ‑S options.

Wiring Terminals

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


  • 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 CO2 sensor:

    9.2 cm L x 9.2 cm W x 2.5 cm H

    (3 5/8" L x 3 5/8" W x 1" H).

  • 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).

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.


  • 0.055 g (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%–90% noncondensing.


  • FCC CFR 47 Part 15 Class B.
  • ICES-3 (B).


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. Available in standard and square models, the SS3 Deep Backplate is designed to fit and cover single-device electrical boxes.