CTRTA DATASHEET

HEAD OFFICE SWEDEN
Phone: [phone]
Web: www.regincontrols.com
E-Mail: [e-mail]
Revision 2019-04 -15
— 1 —
CTRTA(-D)
CTRTA(-D)
CO
2
and temperature transmitters
A range of room transmitters for measuring carbon
dioxide concentration in indoor environments. The
transmitter has a built-in CO
2
sensor with working
range 0...2000 ppm and output signal 0...10V, as
well as built-in 0...10 V and PT1000 temperature
sensors (working range 0...50°C).
9 Output signal CO
2
, 0...10 V DC referring to
0...2000 ppm
9 Temperature sensors 0...10 V DC referring
to 0...50°C and PT1000 class DIN B
9 CO
2
concentration, 0...2000 ppm
9 Temperature 0...50°C
9 Good long-term stability
9 RCBC algorithm
Function
Transmitters with automatic calibration combining
measurement of CO
2
level and temperature in the same
casing. The sensors are mounted in the cover-part of
the casing. The cover is easy to detach from the back by
means of snap-in grips and detachable terminals. This
makes mounting easier. Furthermore, no cables have to be
disconnected, simplifying service and replacement.
The transmitters are intended for wall mounting in HVAC
systems.
CO
2
sensor
The CO
2
concentration is measured using infrared light,
a technique that measures the absorption in gases. It has
a reference measuring system that compensates values in
relation to changes in light intensity. This technique has
many advantages:
• Very high accuracy
• Exact identification of the detected gas
• Low risk of contamination
• Short response time
• Excellent long-term stability
Automatic calibration
The transmitters have automatic calibration, which means
that manual recalibration is not required during the life-
time of the transmitter.
Temperature sensor
The unit has built-in 0…10 V and PT1000 temperature
sensors, working range 0...50°C.
Note! The PT1000 sensor is not compensated for internal
warm-up. The passive temperature output must be cali-
brated with a controller.
RCBC algorithm
The transmitter is equipped with a function that can be
activated to get a more stable CO
2
level in a room that is
not used for parts of a day.
Display (-D models)
Display models have an LCD display showing carbon
dioxide concentration and temperature in an alternating
series.
Applications
The carbon dioxide level gives a direct indication of the
indoor air quality. This information can be used to control
ventilation with high precision and improve the air qual-
ity. By increasing the supply air only when necessary, it is
possible to minimise energy costs.
The transmitter is especially suited for environments such
as cinemas, schools, hospitals, conference rooms, assembly
halls, etc.