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QS5535-840 - Qolsys IQ Temp-S Wireless S-Line Temperature Sensor

QS5535-840 - Qolsys IQ Temp-S Wireless S-Line Temperature Sensor
QS5535-840 - Qolsys IQ Temp-S Wireless S-Line Temperature Sensor
Item# QS5535-840

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Please Note: The Qolsys QS5535-840 wireless temperature sensor has been discontinued without replacement.

Qolsys QS5535-840 Product Description:


The Qolsys QS5535-840 IQ Temp-S is wireless S-Line encrypted temperature sensor designed to alert you if temperatures drop below 40°F or rise above 100°F. The IQ Temp-S temperature sensor works with any S-Line compatible security system control panel.

The QS5535-840 sensor warns against severe temperature changes, depending on the users desired monitoring (i.e. freezing pipes or home comfort). The low temperature alarm restores when temperatures rise above 45°F, and the high temperature alarm restores when temperature drops below 95°F.

This early warning may help you protect your valuables, pets and home from extreme heat or cold in the event of a HVAC or thermostat failure. Homeowners are alerted to the danger via text message and on-screen notifications on the IQ Panel. The QS5535-840 is ideally suited for a wide range of mounting applications including; bathrooms, laundry rooms and basements. The IQ Temp-S uses a new antenna design enabling better performance on a variety of surfaces, including metal doors, and has a 8-10 year battery life. With the IQ Temp-S, you will know there is a problem before it becomes a disaster.

Product Features:

  • Encrypted S-Line sensor technology protects signals sent to the compatible panel (while still providing support for legacy 319.5 systems)
  • Freeze detection alerts panel if temp. drops below 40°F
  • High temp. sensor alerts panel if temp. exceeds 100°F
  • Great to detect HVAC failure
  • Protect elderly, infirm, pets
  • Get a text notification sent to your phone if the IQ Temp-S detects a potential problem

Qolsys QS5535-840 Product Specifications:


  • Cover Tamper: Protects against deliberate tampering
  • Wireless Signal Range: 600ft (200M), open air
  • Unique ID: for each function
  • Transmitter Frequency: 319.5MHz
  • Temperature Checked: every 5 minutes
  • Battery Checked: every hour
  • Batteries (2): Panasonic CR2032, Energizer CR2032, Duracell DL2032

Qolsys QS5535-840 Product Mounting:


  • Bathrooms
  • Laundry Rooms
  • Basements


NOTE: Avoid areas that may retain heat, such as furnace rooms or near hot water pipes.

Qolsys QS5535-840 Product Compatibility:


  • Qolsys IQ Panel 2 (Model Numbers: QS9201-1200-840, QS9202-1200-840)
  • Qolsys IQ Panel 2+ (Model Numbers: QS9201-1208-840, QS9202-1208-840)
  • Qolsys IQ Panel 4 (Model Numbers: IQP4001, IQP4004, IQP4007)
  • Qolsys IQ Hub (Model Numbers: QS9301-1200-840, QS9302-1200-840, QS9307-1200-124)
  • Qolsys IQ4 Hub (Model Number: IQPH051)
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