SRC- C1
Page 4
Subject to alteration
Configuration 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 configuration
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 configuration
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 convenience, 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). The 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 through 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
