Vector SRC-C1 User manual

SRC-C1
CO2 TRANSMITTER/MONITOR
Doc: 70-00-0220A, V2.7, 20210310 © Vector Controls GmbH, Switzerland Page 1-8
Subject to change without notice www.vectorcontrols.com
SRC-C1 - Indoor CO2 Transmitter
The SRC-C1 is an indoor CO2 monitoring/transmitter. Three LEDs in the colors
green, orange and red indicate the CO2 concentration of the room air. This shows
the user when to ventilate. The device has one analog output. The CO2
background calibration of the SRC-C1 guarantees for accurate room air
monitoring.
Features
•Indoor CO2 measurement
•Indication with three separate color LEDs
•Minimum and maximum CO2 value memory
•0…10 V, 0…20 mA or 2…10 V, 4…20 mA measuring output signal
selectable with jumpers
•Levels of CO2 indication programmable
•Automatic CO2 background calibration
•Output signal ranges programmable
•May be used as simple P-controller
•Averaging signal adjustable
•Optional external display (OPA-S)
•Status LED
Applications
•Indoor CO2 measurement (home, office, school, restaurant, greenhouse, …)
•Recording of minimum and maximum CO2 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
samples and generates the output signal.
The output signal range and type may be customized by jumpers and if required by a programming module. Standard
signal ranges are 0-10 VDC, 2-10 VDC, 4-20 mA and 0-20 mA. Other ranges can be defined by using the external display
and programming module (OPA-S).
For OPA-S usage see section “Parameter configuration” on page 5.
Automatic baseline calibration (ABC)
The ABC background calibration constantly supervises the measured CO2 concentrations. The calibration function expects
the CO2 values sink to 400 ppm when the room is not occupied. Over a period of several days the controller tries to reach
this value step by step through recalibration of 30ppm per day max. In order to reach the given accuracy, it is required
that the sensor is for at least 3 weeks in operation.
NOTE: The ABC calibration works only in those applications where the CO2 concentration sinks regularly to fresh air
levels of 400 ppm. For special applications such as green houses, animal farms, etc. the ABC calibration should be
de-activated and the sensor should be manually calibrated. The automatic calibration can deactivate through the
external operation terminal. The Sensor can be calibrated by the client and does not need to be sent in for
calibration. For manual calibration see section “Calibration”on page 7.
Minimum and maximum values
Using a display & programming module OPA-S, the user has the option to read out and reset minimum and maximum
CO2 values. The minimum and maximum values may as well be used as output signals. The minimum and maximum
values are automatically saved to the device and are available after a power interruption.
For OPA-S usage see section “Displaying Minimum and maximum values” on page 4.

SRC-C1
CO2 TRANSMITTER/MONITOR
Doc: 70-00-0220A, V2.7, 20210310 © Vector Controls GmbH, Switzerland Page 2-8
Subject to change without notice www.vectorcontrols.com
Indication of air quality
Three color LEDs are used to indicate air quality: Green for low CO2 concentration, orange for medium and red for high
concentration. The levels for low-medium-high may be programmed.
Safety
DANGER! Safety advice
This device is for use as a CO2 concentration indicator and CO2 transmitter for comfort applications. It is not a
safety device. Where a device failure could endanger human life and property, it is the responsibility of the client,
installer and system designer to add additional safety devices to prevent such a device failure. Ignoring
specifications and local regulations may cause equipment damage and endangers life and property. Tampering
with the device and misapplication will void warranty.
Ordering information
Product Name
Product Nr.
Description/Option
CO2 Sensor
SRC-C1
40-300079
CO2 transmitter
Accessories
OPA-S
40-500006
External display and operation terminal.
Note: For the correct display of values, V1.7 and later is required.
Red-LED
Orange-LED
Green-LED
Air quality LED
No light
: No power or unit damaged
Green
: High air quality (low CO2 level)
Green + Orange
: Good air quality
Orange
: Moderate air quality (medium CO2 level)
Orange + Red
: Low air quality
Red
: Poor air quality (high CO2 level)
Red blinking
: 0 ppm calibration
Green blinking
: 400 ppm calibration
Default CO2 indication setting
Air quality LED
CO2 range in ppm
Green
0…699
Green + Orange
700…999
Orange
1000…1299
Orange + Red
1300…1599
Red
1600…2000

SRC-C1
CO2 TRANSMITTER/MONITOR
Doc: 70-00-0220A, V2.7, 20210310 © Vector Controls GmbH, Switzerland Page 3-8
Subject to change without notice www.vectorcontrols.com
Technical Specifications
Power supply
Operating voltage
24 VAC 50/60 Hz ± 10%, 24 VDC ± 10%
SELV to HD 384, class II transformer, 48 VA 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 (90%)
2 Minutes
Measurement range
0 - 2000 ppm vol.
Repeatability
± 20 ppm ± 1 % of measured value
Accuracy
± 40 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…10 V, 0…20 mA or DC 2…10 V, 4…20 mA
10 bit, 9.7 mV, 0.019.5 mA
Voltage signal: ≥1kΩ, current signal: ≤250Ω
Environment
Operation
Climatic conditions
Temperature
Humidity
To IEC 721-3-3
class 3 K5
0…50° C (32…122° F)
<95% RH 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% RH non-condensing
class 2M2
Standards
Degree of protection
IP30 to EN 60 529
Safety class
III (IEC 60536)
Housing materials
Cover
Mounting plate
Fire proof ABS plastic
Aluminium
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)
122 g (4.3 oz)
Product testing and certification
Declaration of
Conformity
Information on the conformity of our products can be found on our website
www.vectorcontrols.com on the corresponding product page under "Downloads".

SRC-C1
CO2 TRANSMITTER/MONITOR
Doc: 70-00-0220A, V2.7, 20210310 © Vector Controls GmbH, Switzerland Page 4-8
Subject to change without notice www.vectorcontrols.com
Wiring and Connection
For jumper settings see section “Output signal configuration” on page 5.
Mounting location
•On a flat, easily accessible inner wall
•The following installation locations should be avoided:
oProtect from direct exposure to sunlight
oDo not install near heat sources, e.g., radiators or other heat-generating devices
oAreas with poor air circulation and niches, e.g., behind doors or shelves
oOutside walls insufficiently insulated
oIn the direct influence area of ventilation openings and fans
Mounting instruction
See SRC-C1 installation sheet no. 70-000572 (www.vectorcontrols.com).
Dimension mm (inch)
Operation
Displaying Minimum and maximum values
Use the optional display & operation terminal OPA-S to read out or reset the stored CO2 minimum and maximum values.
1. Remove SRC housing from the back plate (see SRC-C1 installation sheet no. 70-000572
http://www.vectorcontrols.com/).
2. Connect the OPA-S operation terminal to the OPA-S connector on the SRC (see section “Wiring and Connection”
on page 4). The measured CO2 value is displayed.
3. Press the “UP” key to see the maximum values or the “DOWN” key to see the minimum values.
4. To reset the minimum value, press the “DOWN” key for at least 5 seconds and wait until the value changes.
5. To reset the maximum value, press the “UP” key for at least 5 seconds and wait until the value changes.
1
V+
AC 24 V 50-60 Hz, DC +24 V ± 10%
2
GND
AC 0 V, DC 0 V
3
AO1
CO2, DC 0(2)...10 V, DC 0(4)...20 mA

SRC-C1
CO2 TRANSMITTER/MONITOR
Doc: 70-00-0220A, V2.7, 20210310 © Vector Controls GmbH, Switzerland Page 5-8
Subject to change without notice www.vectorcontrols.com
Configuration
Output signal configuration, Jumper settings
The analog output signal type for the AO1 output may be configured with jumper
JP1 for Voltage or Current control signals. The factory setting is Voltage.
For Jumper location see section “Wiring and Connection” on page 4.
The signal range may be set with jumper JP2 for the analog signal output AO1.
JP2 will only operate if the output range specified with output parameter OP 01
and OP 02 is left at the default value of 0…100%. With any other setting the
position of JP2 has no influence and the signal range defined with the output
parameters OP 01 and OP 02 applies.
For Jumper location see section “Wiring and Connection” on page 4.
Parameter configuration
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.
NOTE: For the correct display of data, version 1.7 or grater of OPA-S is required.
OPA-S operation
1. Remove SRC housing from the back plate (see SRC-C1 installation sheet no. 70-000572
http://www.vectorcontrols.com/).
2. Connect the OPA-S operating device to the OPA-S connector on the SRC (see section “Wiring and Connection” on
page 4). The measured CO2 value is displayed.
3. Use the "UP" and "DOWN" keys to set the password "0009" and confirm with the "RIGHT" key.
4. Select "IP SEL (Input Parameter) or “OP SEL” (Output Parameter) with "UP" and "DOWN" and confirm with the
"RIGHT" key. The first parameter is displayed.
5. Use the "UP" and "DOWN" key to switch to the desired parameter. After pressing the "RIGHT" key adjust the
parameter value with the "UP" and "DOWN" keys. Confirm the setting with the "RIGHT" key.
6. Complete parameter setting by pressing the left "ON/OFF" key twice. The measured CO2 value is displayed.
Important
In order for the SRC-C1 to apply the new settings correctly, the parameter setting must be completed with the
left "ON/OFF" key!
Detailed information on the OPA-S can be found on the website www.vectorcontrols.com on the corresponding
product page under "Downloads".
Input configuration
Parameter
Description
Range
Default
IP 00
CI1: Light intensity of air quality LED on front
0…10
8
IP 01
CI1: Samples taken for averaging control signal 1)
1…255
10
IP 02
CI1: Calibration
-10…10%
0
IP 03
CI1: Minimum CO2 range ppm 2)
(CO2 level when output is at its minimum)
0…5000 ppm
0 ppm
IP 04
CI1: Maximum CO2 range ppm 2)
(CO2 level when output is at its maximum)
0…5000 ppm
2000 ppm
IP 05
CI1: CO2 level for medium CO2 indication 2)
0…5000 ppm
1000 ppm
IP 06
CI1: CO2 level for high CO2 indication 2)
0…5000 ppm
1600 ppm
IP 07
CI1: Enable ABC automatic CO2 background calibration
ON, OFF
ON
IP 08
CI1: Calibrate CO2 sensor
Note: For normal operation, calibration is not required. Only experts
should calibrate the sensor.
0 = No calibration (default)
1 = Calibrate to gas (0 ppm)
2 = Calibrate to fresh air (400 ppm)
0…2
0
1) Sample interval: 1 sec.
2) Changing this parameter affects the control of the air quality LEDs as follows:
Air quality LED
Effective Parameters
Green
IP 03 value … (IP 05 value + 400) / 2
Green + Orange
(IP 05 value + 400) / 2 … IP 05 value
Orange
IP 05 value … (IP 05 value + IP 06 value) / 2
Orange + Red
(IP 05 value + IP 06 value) / 2… IP 06 value
Red
IP 06 value … IP 04 value
Signal type
JP1
Voltage (U)
(1-2)
Current (I)
(2-3)
Signal range
JP2
0…10 V, 0…20 mA
(1-2)
2…10 V, 4…20 mA
(2-3)

SRC-C1
CO2 TRANSMITTER/MONITOR
Doc: 70-00-0220A, V2.7, 20210310 © Vector Controls GmbH, Switzerland Page 6-8
Subject to change without notice www.vectorcontrols.com
Output configuration
Parameter
Description
Range
Default
OP 00
AO1 (CO2): Configuration of output signal:
0 = CO2 value
1 = Recorded minimum CO2 value
2 = Recorded maximum CO2 value
0…2
0
OP 01
AO1 (CO2): Minimum limitation of CO2 output signal 3) 4)
0…100 %
0 %
OP 02
AO1 (CO2): Maximum limitation of CO2 output signal 3) 4)
0…100 %
100 %
3) The Output signal will be scaled according to selected input range, selected limitation of output signal and the output
signal range selected by the jumper.
4) If the default values are changed, the position of JP2 has no influence and the output signal range defined with the
parameters applies.
IP
=
Input Parameter
OP
=
Output Parameter
CI
=
CO2 Input
AO
=
Analog Output
Examples of CO2 output signal on AO1:
Output signal type = Voltage (JP1 jumper setting)
Output signal range = 0…10 VDC (JP2 jumper setting)
Default setting
Custom setting
IP 03 = 0 ppm, IP 04 = 2000 ppm (range)
IP 03 = 0 ppm, IP 04 = 2000 ppm (range)
OP 00 = 0 (CO2 value)
OP 01 = 0 % (limitation)
OP 02 = 100 % (limitation)
OP 00 = 0 (CO2 value)
OP 01 = 20 % (limitation)
OP 02 = 80 % (limitation)
100%
10 V
0%
0 V
0 2000
ppm
Output
0 2000
ppm
Output
20%
2 V
80%
8 V
Error messages shown on OPA-S
Error
Description
Err 1:
Communication error: Verify cable connections, cable type and maximum distance.
Err 2:
CO2 sensor error: Make sure the sensor is not miss-calibrated. If possible, execute 400 ppm calibration. (see
section “Calibration” on page 7).
If error cannot be removed by calibrating the sensor, replace product.
Use the CO2-Transmitter as P-Controller
The CO2-transmitter may be converted into a proportional fresh air controller through a simple change of two parameter
settings:
1. Set a minimum CO2 concentration when the fresh air fan should start to run at its minimum speed for example
500 ppm. Set this as the minimum value in IP 03 parameter.
2. Then define the CO2 value when the fan should run at full speed, for example 1000 ppm and set this value in
IP 04.
Your transmitter has now been converted into an air quality P-Controller!
By using the analog output, the fan will start to run if the CO2 concentration is higher than 500 ppm. It increases to its
maximum when CO2 concentration reaches 1000 ppm.

SRC-C1
CO2 TRANSMITTER/MONITOR
Doc: 70-00-0220A, V2.7, 20210310 © Vector Controls GmbH, Switzerland Page 7-8
Subject to change without notice www.vectorcontrols.com
Status-LED
Calibration
The CO2 sensor 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 convenience, in the event that one cannot wait for the ABC algorithm to cure any
calibration offset, manual calibration may be activated using following procedure. There are two calibration possibilities: 0
ppm and 400 ppm. Only one of the two manual calibration needs to be performed.
Calibration to 400 ppm (Fresh air)
1. Connect OPA-S and expose the active sensor for at least 5 minutes to fresh outside air. It is important to expose
the sensor to only fresh air. An open window close to the sensor with a higher level of CO2 could prevent a stable
signal. Observe the CO2 value on the OPA-S.
2. Once the CO2 value has stabilized, login with the OPA-S and set IP 08 = 2, then exit configuration mode. The air
quality led will blink green color 2 times alternating with the status led in 2 second intervals.
3. The sensor will now wait for a stable concentration. Once the calibration has been executed, the status LED will
show constant RED and the green air quality led will blink for 10s if successful. If calibration is not successful (no
stability of concentration for 5 min, no communication with sensor) the red air quality led will blink instead and
the status LED will stay constantly on red in error mode. Recalibrate or restart device to stop error mode.
4. You may additionally verify the calibration using the OPA-S. If successful IP 08 will change to 0. If unsuccessful
the value of IP 08 changes to 4.
5. If unsuccessful, wait at least 1 minute before repeating the procedure again. Make sure that the sensor
environment is steady and calm!
Calibration to 0 ppm with CO2 free gas
1. Connect OPA-S and place the sensor in a container filled with a gas mixture which is free from CO2 (i.e., Nitrogen
or Soda Lime CO2 scrubbed air). Observe the CO2 value on the OPA-S.
2. Once the CO2 value has stabilized, login with the OPA-S and set IP 08 = 1, then exit configuration mode. The air
quality LED will blink in red color 2 times alternating with the status led in 2 second intervals.
3. The sensor will now wait for a stable concentration. Once the calibration has been executed, the status LED will
show constant RED and the green air quality led will blink for 10s if successful. If calibration is not successful (no
stability of concentration for 5 min, no communication with sensor) the red air quality led will blink instead and
the status LED will stay constantly on red in error mode. Recalibrate or restart device to stop error mode.
4. You may additionally verify the calibration using the OPA-S. If successful IP 08 will change to 0. If unsuccessful
the value of IP 08 changes to 4.
5. If unsuccessful, wait at least 1 minute before repeating the procedure again. Make sure that the sensor
environment is steady and calm!
Status LED
- No light
: No power or unit damaged
- 5 sec flashing
: Normal
- 2 second blinking
: Calibration
- 10 second pulse
: Calibration successful
- Constant red > 10 sec
: Calibration or sensor error
Red Status-LED

SRC-C1
CO2 TRANSMITTER/MONITOR
Doc: 70-00-0220A, V2.7, 20210310 © Vector Controls GmbH, Switzerland Page 8-8
Subject to change without notice www.vectorcontrols.com
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