ASHRAE Journal - July 2020 - 104

Suppliers' New Product Preview Advertising Section

Common Pitfalls When Installing
HVAC Wall Sensors
The most important thing to
remember when installing wall
sensors is that they are intended
for measuring the conditions that
people are experiencing in a room.
Choose a representative location
with free air ﬂow and no heat
sources nearby. Common errors
include mounting the sensor in a
place with very restricted air ﬂow
or in direct sunlight - which may
heat up the sensor. It's also worth
noting that generic wall sensors are
not designed to be mounted on the
ceiling.

The wayward contractor

In a recent case, a convention
center thought their new control
system, mounted in the rafters, was
working very well, but when CO2
levels were checked at ﬂoor level,
readings of about 2000 ppm were
seen. The contractor explained
that the sensors were installed in
the rafters because it was more
convenient.

Small details matter

Wall sensors are designed to be
mounted in a certain direction, and
if it says 'This Side Up', that's what
you should do. This is due to the
fact that any electronics inside the
wall unit will generate heat. If you
mount a wall sensor in the correct
orientation, the excess heat will be
carried away by the air ﬂow without
disturbing the measurements.

Fresh concrete

Another source of error could be
fresh concrete, as concrete absorbs
CO2. In rooms with exposed
concrete surfaces, CO2 levels will
be quite low. If you mount a sensor
directly on an exposed concrete
surface, you will get an extremely
low CO2 concentration inside
the sensor box which won't be
representative of the air outside.

Special environments

A wall sensor is designed to work
well in a normal office environment.

The Industry Standard
for HVAC
Meters, sensors and transmitters for measuring
humidity, temperature, and carbon dioxide

vaisala.com

If you have special conditions or
an environment like a cleanroom,
where it is common to have forced
downward air ﬂow, these sensors
might not work too well as the
heat generated by the electronics
will be carried down to the sensor
and distort the readings. In an
application with downward air ﬂow,
you need to make sure that your
sensor is designed for use in these
conditions.

Wall materials

Wall sensor readings can also be
distorted by a wall material that
conducts heat, for example steel
or concrete. If you bolt the sensor
directly to the wall, it might not
give a correct indication of the air
temperature in the room - instead
it's indicating the approximate
temperature of the wall itself. If
you have metal or concrete wall
elements, it's a good idea to use
some kind of insulation between the
sensor and wall.

http://www.vaisala.com

ASHRAE Journal - July 2020

Table of Contents for the Digital Edition of ASHRAE Journal - July 2020

Contents
ASHRAE Journal - July 2020 - Intro
ASHRAE Journal - July 2020 - Cover1
ASHRAE Journal - July 2020 - Cover2
ASHRAE Journal - July 2020 - 1
ASHRAE Journal - July 2020 - Contents
ASHRAE Journal - July 2020 - 3
ASHRAE Journal - July 2020 - 4
ASHRAE Journal - July 2020 - 5
ASHRAE Journal - July 2020 - 6
ASHRAE Journal - July 2020 - 7
ASHRAE Journal - July 2020 - 8
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ASHRAE Journal - July 2020 - 27
ASHRAE Journal - July 2020 - 28
ASHRAE Journal - July 2020 - 29
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ASHRAE Journal - July 2020 - Cover3
ASHRAE Journal - July 2020 - Cover4
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