Application Guide

6 AG150119D
Reducing Temperature Sensing Errors
• Air movement between the conditioned space and the conduit and/or wall cav-
ity can skew sensor readings. Apply sealant inside the conduit and other holes
to block air leakage. See Mounting Components and Height on page 5.
• Mounting on an exterior wall will allow varying outside conditions to affect
the sensor’s readings. Mounting on or near a large interior thermal mass (e.g.,
concrete block wall) can slow the sensor’s response to room air temperature
changes. These mounting areas should be avoided, but a foam gasket (e.g.,
HPO-1161 or HPO-9002) mounted behind the backplate may help insulate the
sensor from a less-than-optimal wall surface. See (HPO-9002) Foam Gasket
on a (NetSensor) Backplate on page 6, Mounting Components and Height on
page 5, and the accessories available for the applicable product.
NOTE: A foam gasket may also help block air leakage from the wall cavity.
(HPO-9002) Foam Gasket on a (NetSensor) Backplate
NOTE: The notch in the HPO-9002 gasket should match the location of the
notch in the STE-9000 series NetSensor case. (AppStats, on the other
hand, do not have a notch in the case.)
• After reducing environmental issues as much as possible, calibrate the sensor
(controller or thermostat input) for maximum accuracy within its environment.
See the relevant product calibration procedure to provide the optimal offset.
(Wait until the sensor has been operating for at least half an hour before
calibrating it.)
Troubleshooting (Location)
To correct or compensate for sensing problems caused by mounting issues:
• Reposition the sensor or the surrounding obstructions. See Mounting for
Optimal Temperature Sensing on page 2 and Mounting for Optimal Motion
Sensing on page 3.
• Insulate the sensor from air leakage and heating/cooling sources. See Reduc-
ing Temperature Sensing Errors on page 6 and Mounting Components and
Height on page 5.
• Adjust the sensor calibration to offset the environmental issues. See the
instructions for the sensor and/or conguration software.
Inaccurate sensing may also be caused by one of a variety of electrical or
conguration issues. See the installation and/or application guide of the sensor
for those factors.