Specifications

PolarXpress XT Sensor
Wireless Temperature Sensor
GENERAL DESCRIPTION
The RF Wireless Temperature Sensor uses a type NTC
thermistor to measure temperature.
FEATURES
• Accurate to ± 1º C (± 1.8º F)
• Increased accuracy by user calibration to ± 0.25º C
(± 0.45º F)
• PolarXpress online wireless sensor monitoring and
notification system to configure sensors, view data
and set alerts via SMS text and email.
PRINCIPLE OF OPERATION
The PolarXpress Wireless Temperature Sensor outputs
the ambient temperature in degrees Fahrenheit. It is
programmed to sleep for a user-given time interval
(heartbeat) and then wakeup, send power to the NT
Thermistor and wait for it to stabilize, and convert the
analog data, mathematically compute the temperature
and transmit the data to the gateway. To stay within the
abilities of the processor, the temperature is computed
off a data table provided by the manufacturer. To reduce
error, a variable resistor configuration is implemented
over specified temperature ranges.
POWER OPTIONS
X Sensors are powered by a replaceable 3.0 V coin cell
battery. The X2 Sensors are larger in size (3” [L] x 2.1”
[W] x 1.2” [h]) and include two long-life AA batteries.
It is recommended that unless you are using the AA
battery solution, you set heartbeat to no faster than one
hour to preserve battery life.
APPLICATIONS
• Cabinet Temperature Monitoring
• Return Air Temperature Monitoring
• Supply Air Temperature Monitoring
POLARXPRESS X SENSOR CORE
SPECIFICATIONS
• Power: X Sensor: replaceable 3.0 V coin cell battery.
X2 Sensor: 2 replaceable AA 1.5V batteries.
• Communication: RF 900, 868 and 433 MHz
• Antenna: 4” wire antenna
• Operating Temperature: -20º to 60ºC (-4º to 140ºF)
• Device Range: 250 - 300 ft. non-line-of-sight*
• External Probe: X2 Sensors come with External
Probe Leads. (Available in custom lengths.)
• Battery Life:
X Sensor: At 1 hour heartbeat setting, coin cell
battery will last 1-2 years.**
X2 Sensor: At 1 hour heartbeat setting, included
AA batteries will last more than 4 years.**
* Actual range may vary depending on environment.
** Battery life is determined by sensor reporting frequency and
other variables.
1.775 in
(45.085 mm)
1.040 in
(26.416 mm)
Height: 0.785 in
(19.939 mm)
™
2.100 in
(53.340 mm)
3.020 in
(76.708 mm)
Height: 1.270 in (32.258 mm)
™
X Sensor
X2 Sensor