SRC - C1
Page 1
Subject to alteration
SRC- C1
Indoor CO2 Transmitter
Features
Indoor CO2 measurement
Indication with three color led
Minimum and maximum value memory
0…10V, 0…20mA or 2…10V, 4…20mA measuring signals
selectable with jumpers
Optional alternative signal ranges programmable
May be used as simple P-controller
Selectable averaging signal
Optional external display (OPA-S)
Status LED
Applications
Indoor CO2 measurement.
Recording of minimum and maximum limits for critical
environments
Direct control of extraction fan.
CO2 Transmitter
The CO2 concentration is measured through non-dispersive infrared (NDIR) waveguide technology with ABC automatic
background calibration algorithm. The applied measuring technology guarantees excellent reliability and long term
stability. The microprocessor samples the CO2 once per second. It calculates an averaging signal over a preset number
of seconds and generates the output signal.
The output signal range and type may be customized by jumpers and if required by a programming tool. Standard
signal ranges are 0-10VDC, 2-10VDC, 4-20mA and 0-20mA. These ranges can be set by jumpers. Other ranges can be
set by
using the external display and programming module. (OPA-S)
Minimum and Maximum Values:
Using a display & programming accessory, the user has the option to read out and reset minimum and maximum
values. The minimum and maximum values may as well be used as output signals. The minimum and maximu m
values are saved into the EEPROM and are available after a power interruption.
Indication of air quality :
A three color LED is used to indicate air quality: Green light for low CO2 concentration, orange light for medium and
red light for high concentration. The levels for low-medium-high may be programmed.
Defaul
t settings are 0 ppm< low < 800 ppm< medium < 1500 ppm high.
Use as P-controller
Set a minimum concentration when the extract fan should start to run at its minimum speed. For example 700 ppm.
Set this as the minimum value in IP03 parameter. Then define the value when the fan should run at full speed, for
example 1500 ppm and set this value in IP04. Your transmitter has now been converted into an air quality P -controller!
The fan will start to run if the CO2 concentration is higher than 700 ppm. It increases to its maximum when CO2
concentration reaches 1500 ppm. y
Ordering
Item Name Item Code Description/Option
SRC-C1
40-30 0062
CO2 transmitter
Accessories
Item Name Item Code Description/Option
OPA-S
40-50 0006
External display module.
For the correct display of values V1.4 and later is required
Maintenance
The SRC-C1 CO2 transmitter is maintenance free in normal environments thanks to the built-in self-correcting ABC
algorithm. Discuss your application with Vector Controls GmbH in order to get advice for a proper calibration strategy.
When checking the sensor accuracy, PLEASE NOTE that the sensor accuracy is defined at continuous operation (at
least 3 weeks after installation)!
Error messages visible on OPA - S
Following error condition may be displayed:
Err1: Communication time out between terminal unit and transmitter. Verify wiring, connections and state of sensor.
Err3: The sensing element
is damaged or became disconnected.
Insight Control
Ph 1300 665 831
www.insightcontrol.net.au
SRC- C1
Page 2
Subject to alteration
Technical Specication
Power Supply Operating Voltage 24 V AC 50/60 Hz ± 10%, 24VDC ± 10%
SELV to HD 384, Class II transformer, 48VA max
Power Consumption Max 2 VA
Connection Terminal Connectors For wire 0.34…2.5 mm2 (AWG 24…12)
CO2 measurement
Sensing Method Non-dispersive infrared (NDIR) waveguide
technology with ABC automatic
background calibration algorithm
Sampling Method Diffusion
Response Time (T
1/e
) 20 sec diffusion time
Measurement Range
0 - 5000 ppm
vol.
Repeatability
± 20 ppm ± 1 % of measured value
Accuracy ± 30 ppm ± 3 % of measured value
Pressure Dependence + 1.6 % reading per kPa deviation from normal
pressure, 100 kPa
Signal Outputs Analog Outputs
Output Signal
Resolution
Maximum Load
DC 0-10V or 0…20mA
10 Bit, 9.7 mV, 0.019.5 mA
20 mA, 500
Environment Operation
Climatic Conditions
Temperature
Humidity
To IEC 721-3-3
class 3 K5
0…50°C (32…122°F)
<95% R.H. non-condensing
Transport & Storage
Climatic Conditions
Temperature
Humidity
Mechanical Conditions
To IEC 721-3-2 and IEC 721-3-1
class 3 K3 and class 1 K3
-30…70°C (-22…158°F)
<95% R.H. non-condensing
class 2M2
Standards
conformity
EMC Directive
Low Voltage Directive
2004/108/EC
2006/95/EC
Product standards
Automatic electrical controls for
household and similar use
Special requirement on temperature
dependent controls
EN 60 730 –1
EN 60 730 – 2 - 9
Electromagnetic compatibility for
industrial and domestic sector
Emissions: EN 60 730-1
Immunity: EN 60 730-1
Degree of Protection IP30 to EN 60 529
Safety Class III (IEC 60536)
Housing Materials Cover
Mounting Plate
Fire proof ABS plastic
Galvanized Steel
General Dimensions (H x W x D) 21 x 88 x 88 mm (0.8 x 3.5 x 3.5 in)
Weight (including package) 175 g (6.2 oz)
Dimensions mm(inch)
88 (3.5)
88 (3.5)
21 (0.8)
Insight Control
Ph 1300 665 831
www.insightcontrol.net.au
SRC - C1
Page 3
Subject to alteration
Mounting location
Mount the transmitter on a flat interior wall of the room to be controlled. Do avoid obstructions such as shelves,
curtains and recesses. Do not place near heat sources, draft channels. Do not expose to direct sunlight.
Installation
1. Open the single screw on the cover and remove cover from mounting plate.
2. Fix the mounting plate to the flush mounting box or the wall surface
3. Connect the conductors to the terminals of the back part according to wiring diagram
4. The end of the conduit at the sensor must be sealed to pr
event false measurements due to draughts through
the conduit.
5. Slide the two hooks on top of the cover into the two latches on top of the mounting plate.
6. Close the cover.
7. With a Philips-type screw driver of size #2, carefully tighten the front holding screw to secure the cover to the
back part. There is no need to tighten the screw too much.
Connection terminals
1: G Power supply 24VAC, +24VDC
2: G0 Power supply 0VAC, -24VDC
3: U1 JP1 = 1-2, voltage output of CO2 transmitter 0…10V or 2…10V (JP2)
3: I1 JP1 = 2-3, current output of CO2 transmitter 0…20mA or 4…20mA (JP2)
J umper Settings
JP1 Signal type
JP2 Signal range
U1: 0-10V
I1: 0-20mA
U1: 2-10V
I1: 4-20mA
3
2
1
3
2
1
U1
0-10V, 2-10V
I1
0-20mA, 4-20mA
3
2
1
3
2
1
Status LED
LED indicates status
No light: no power or unit damaged
5 sec blinking: Normal
2 sec blinking: OPA-S connected
1 sec blinking: Sensor element error
if alternate in 2 sec interval with air
quality LED: Calibration is active.
OPA-S
1 2 3
JP1
JP2
STATUS
JP3
1 2 3 4
Calib: 0 400 ppm
G 24V
G0 0V
U1/ I1 AO CO2
JP3 Calibration
Calibrate 0 ppm
Provide CO2 free gas
Calibrate 400 ppm
Provide clean fresh air
Standard position,
No calibration
1 2 3 4
1 2 3 4
1 2 3 4
Air Quality
Air Quality LED
LED indicates status
No light : no power or unit damaged
Green : Low CO2 level
Orange : Medium CO2 level
Red : High CO2 level
Green blinking: 0ppm calibration
Red blinking: 400ppm calibration
Note: JP3 must be either removed or placed
at position 2-3 anytime when not calibrating!
0VAC
-24VDC
24V ADC
1
G
SRC - C1
2
G0
3
U1/I1
CO2 out
Output signal conguration
The analog output signal type
may
be configured with a jumper for 010 VDC or 0-20 mA control
signals. The jumpers are located
next to the terminal connector of
each analog output. See table
below for jumper placement. The
factory setting is to 0-10 VDC.
The signal range may be set with
JP2 for both analog outputs. JP2
will only operate if the output
range specified with OP01 and
OP02 is left at the default position
of 0…100%. With any other
setting the position of JP2 has no
influence and the range defined
with the output parameters
applies.
Insight Control
Ph 1300 665 831
www.insightcontrol.net.au
SRC- C1
Page 4
Subject to alteration
Conguration parameters
The transmitter can be adapted to fit perfectly into any application by adjusting the software parameters. The
parameters are set with the operation terminals OPA-S. The OPA-S may also be used as remote indicator.
For correct display version 1.4 of OPA-S is required.
Input conguration
Parameter
Description
Range
Default
IP 00
Enable display of air quality LED on front.
ON, OFF
ON
IP 01 Samples taken for averaging control signal 1…255 10
IP 02
Calibration
-10…10%
0
IP 03 Minimum CO2 range ppm
(concentration when output is at its minimum.
0…9900 ppm 0 ppm
IP 04 Maximum CO2 range ppm
concentration when output is at maximum)
0…9900 ppm 2000 ppm
IP 05
Level for medium air quality (orange light)
0…9900 ppm
800 ppm
IP 06
Level for high air quality (red light)
0…9900 ppm
1500 ppm
Output conguration
Parameter Description Range Default
OP 00 AO1: CO2: Configuration of output signal:
0 = Feedback CO2 input,
1 = Feedback CO2 minimum value
2 = Feedback CO2 maximum value
0 – 2 0
OP 01 AO1: CO2: Minimum limitation of output signal 0 – Max % 0%
OP 02
AO1: CO2: Maximum limitation of output signal
Min – 100%
100%
Calibration
The default sensor OEM unit is maintenance free in normal environments thanks to the built-in self-correcting ABC
algorithm (Automatic Baseline Correction). This algorithm constantly keeps track of the sensor’s lowest reading over a
7 days interval and slowly corrects for any long-term drift detected as compared to the expected fresh air value of 400
ppm CO2.
Rough handling and transportation might, however, result in a reduction of sensor reading accuracy. With time, the
ABC function will tune the readings back to the correct numbers. The default “tuning speed” is however limited to
about 30 ppm/week. For post calibration conveni
ence, in the event that one cannot wait for the ABC algorithm to cure
any calibration offset, jumper 3 is provided for the operator to choose calibration options.
If jumper 3 is placed on position 1-2, for a minimum time of 8 seconds, the internal zero calibration is executed, in
which case the sensor must be purged by some gas mixture free from CO2 (i.e. Nitrogen or Soda Lime CO2 scrubbed
air). The air quality LED is blinking in green color alternately with the status LED in 2 second intervals.
If jumper 3 Is placed on position 3-4, it is assumed that the sensor is operating in a fresh air environment (400 ppm
CO2). T
he air quality LED is blinking in red color alternately with the status LED in 2 second intervals.
If unsuccessful, please wait at least 1 minute before repeating the procedure again. Make sure that the sensor
environment is steady and calm!
Make sure to return jumper 3 to its default position of 2 - 3!
Zero calibration procedure
The zero calibration procedure is as follow:
1. Connect the sensor on top with a tube (soft tubing 2x4 mm) and a
nipple (nylon tubing 30x0.8x2.2 mm), see Figure 4 below. There
are 2 alternative positions for nipple attachment.
2. Let a gas mixture flow into the sensor t
hrough the applied tube.
The flow shall be in the range of 0.3 – 1.0 liter/minute during 3
minutes. Keep the gas mixture flowing during the whole procedure.
3. Set jumper 3 to position 1-2 for a minimum time of 8 seconds. The
air quality LED will blink in green color alternating with the status
led in 2 second intervals.
4. Verify the zero calibration using the OPA-S or the analog outputs.
They should show 0 ppm CO2.
5. If zero calibration is not executed (sensor detected unstable gas
concentration) wait 10 sec and repeat steps 3 and 4 again. Do not
breathe on the sensor!
Insight Control
Ph 1300 665 831
www.insightcontrol.net.au
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