NIEUWKOOP GT3000 User manual

USER MANUAL
GT3000
CO2TRANSMITTER, 0-2000 PPM

GT3000
CO2 TRANSMITTER, 0-2000 PPM
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General
The IAQ-sensor product (sensor for wall mounting) is designed to measure carbon dioxide
(CO2) in rooms. Option TR is prepared for temperature measurements by the resistive
temperature probe mounted by the user. The temperature probe is potential free (floating).
Option Disp, displays the measured CO2value in ppm (parts-per-million) on the LCD.
The units are designed for connecting to Direct Digital Control (DDC) with 0─10V or 2─10V signal
inputs. The two parallel signal outputs OUT1 (0─10V) and OUT2 (2─10V or 4─20mA) give linear
signal voltages or currents corresponding to the measuring range. The output OUT2 also
indicates the status by setting the output voltage to 1V or the output current to 2mA when the
sensor self-diagnostics detects any error.

GT3000
CO2 TRANSMITTER, 0-2000 PPM
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To open the wall mounted housing
NOTE:
ESD sensitive product.
Use ESD protection equipment.
Figure 1. Closed housing seen from above. The housing is opened by pressing a screw driver on
the locking hook. The locking hook is then released.
Electrical connections
The power supply has to be connected to and is considered as system ground.
NOTE:
The same ground reference has to be used for the unit and for the control system!
Terminal
Function
Electrical data
Remarks
Standard settings
Remarks
Settings of
ext range 10000ppm
Power (+)
Power ground
(-)
24VAC/DC+
(±20%), 2W
24VAC/DC-
System voltage
reference
Out (1)
Out (2)
Analogue
output 1 (+)
Analogue
output 2 (+)
0-10VDC
2.0-10.0VDC
or
4.0-20.0mA
0.9-1.6VDC
or
1.5-2.5mA
0VDC
or
0mA
0-2000 ppm CO2
0-2000 ppm CO2
Status = ERROR
Status = NOT READY
0-10000 ppm CO2
0-10000 ppm CO2
Table I. Connections of the main terminal

GT3000
CO2 TRANSMITTER, 0-2000 PPM
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4
Figure 2. PCB with jumper to configure OUT2 for current output 4─20mA or voltage output
2─10VDC
Figure 3. Enlarged picture of the PCB with the jumper set to current output (left position)
Figure 4. Enlarged picture of the PCB with the jumper set to voltage output (right position)
Self-diagnostics
The system contains a complete self-diagnostic procedure that is executed automatically
when the sensor is in operation. The yellow LED is lit if an error is found. Sensors with display
show a wrench if an error is found. The wrench is shown and the yellow LED is lit during the first
seconds after power up and if the measuring range exceeded. They are automatically turned
off when the sensor returns to normal operation. The output OUT2 indicates the same
information by setting the output voltage to 1V or 2 mA.
Maintenance
The unit is basically maintenance free in normal environments thanks to the built-in
selfcorrecting ABC algorithm. Discuss your application with Nieuwkoop B.V. in order to
get advice for a proper calibration strategy.

GT3000
CO2 TRANSMITTER, 0-2000 PPM
_____________________________________________________________________________________________
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NOTE:
The sensor accuracy is defined at continuous operation (at least three (3) ABC periods after
installation)
Electronic products should be disposed of via a recycling centre.
Dimensions
Figure 5. Sensor dimensions in mm and (inches)
Wall mounting
screw head diameter <7.5 mm (0.295 inches)
screw head height <2.4 mm (0.094 inches).