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Datasheet: K-30 Sensor

The K30 sensor is a low cost, infrared and maintenance‐free transmitter

module intended to be built into different host devices that require CO2

monitoring data.

Applications

The K30 is an accurate, yet low cost gas sensing solution for OEMs who

wish to integrate CO2 gas sensing into their product without investing in

their own gas sensor development. The compact sized and low powered

module is intended to be an add‐on component to compliment other

microprocessor‐based controls and equipment.

The K30 may be software customized in different ways in order to

optimize the total system with respect to the OEM application.

The K30 is offered for installation in OEM IAQ sensor housings, OEM air handling units, OEM alarm sensor housings, among other

applications. The only restriction for what this product can be used for is the creativity and inventiveness of the customer.

This new product version is a RoHS compliant upgrade replacing the former the K30 product, has the same key product

performance, but now has an improved speed of response and a reduced spatial build‐in height.

Terminal Descriptions

The table below specifies what terminals and I/O options are available in the general K30 platform (see also the layout picture Fig.

2). Please note, however, that in the K30‐STA default configuration, only OUT1, OUT2, OUT3, OUT4, Din1, Din2 and Status have any

pre‐programmed functions. These are described in the chapter “Default Configuration”.

Functional group Descriptions and ratings

Power supply

G+ referred to G0: Absolute maximum ratings 5.5 to 14V, stabilized to within 10%

5V to 9V preferred operating range.

Unprotected against reverse connection!

Serial Communication

UART (TxD, RxD)

CMOS, ModBus communication protocol.

Logical levels corresponds 3.3V powered logics. Refer “ModBus on CO2

Engine K30 “ for electrical specification.

Outputs

OUT1

Buffered linear output 0..4 or 1..4VDC or 0..10V or 2..10V, depending on

specified power supply and sensor configuration. ROUT < 100 W, RLOAD > 5 kW

Load to ground only!

Resolution 10mV (8.5 bits in the range 0..4V).

OUT2

Buffered linear output 0..4 or 1..4VDC or 0..5V or 1..5V, depending on

specified power supply and sensor configuration. ROUT < 100 W, RLOAD > 5 kW

Load to ground only!

Resolution 5mV

Can be used as alternative for OUT1, or for a second data channel, or in an

independent linear control loop, such as a housing temperature stabilization

OUT3

CMOS unprotected. Digital (High/Low) output.

High Output level in the range 2.3V min to DVDD = 3.3V. (1 mA source)

Low output level 0.75V max (4 mA sink)

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Can be used for gas alarm indication, or for status indication etc.

OUT4

CMOS unprotected. Digital (High/Low) output.

High Output level in the range 2.3V min to DVDD = 3.3V. (1 mA source)

Low output level 0.75V max (4 mA sink)

Can be used for gas alarm indication, or for status indication etc.

Status

CMOS unprotected.

High Output level in the range 2.3V min to DVDD

DVDD Regulated Voltage Output 3.3V to 50mA

Inputs

Din0, Din1, Din2, Digital switch inputs, pull‐up 120k to DVCC 3.3V. Driving it Low or connecting to

Din3,

ground G0 activates input.

Din4

Pull‐up resistance is decreased to 4..10k during read of input or jumper.

Advantages are lower consumption most of the time the input/jumper is kept low

and larger current for jumpers read in order to provide cleaning of the contact.

Can be used to initiate calibration or to switch output range or to force output to

predefined state. All depends on customer needs.

I2C extension.

See our I2C Comm. Pull‐up of SDA and SCL lines to 3.3V

guide

Table 1. I/O notations used in this document for the K30 platform with some descriptions and ratings.

Please, beware of the red colored texts that pinpoint important features for the system integration!

General PCB Overview

Figure 2. K30 I/O notations, terminal positions and some important dimensions for mounting the K30 platform PCB into a

host system (Top view). The blue filled pins are defined by default.

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Figure 3. K30 OBA position.

Figure 4. K30 mechanical drawing.

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Installation

The modules are factory calibrated and ready for use directly after power up. There are several alternative ways to connect the K30

to a host system (see also Figure 2):

1. Using “UART connector”, including terminals for power supply (G+ and G0), UART (TxD, RxD).

2. Using the 3 pins main terminal. Available signals are power supply (G+ and G0) and the buffered analogue output (OUT1). A

variety of user selections exist for this option regarding standard 5.08 mm pitch components and mounting alternatives

(top/bottom).

3. Using 20 pin connector strips, or IDC connector, most of the system information is reached.

Host Integration Considerations and EMI Shielding

If an IDC connector is being used to connect the K30 module to a host PCB, this connector can in some situations be used as the only

fixture. If instead fixing the K30 PCB using mechanical poles and screws, no more than 2 positions should be considered. This is

because the PCB should not be exposed to any mechanical stress, and it is small and lightweight enough for just 2 attachment

points.

To provide means for attachments, there are 4 possible screw holes available, all of them having a collar that is electrically

connected to ground (G0). These connections are, however, not totally equivalent:

The two screw points in the upper left corner (having the IDC and edge connectors faced downwards, as in Figure 2) are connected

to the analogue ground. They are the preferred choice for connection to some EMI shield, if so is required. This is normally necessary

only if the application is such that large EMFs are foreseen. If this option is being used, precaution must be taken so as to exclude

any power supply currents! Sensor reading instability is an indication of the need for shielding, or of improper enclosure system

groundings.

The two screw points in the right bottom corner are connected to the digital ground. Connection to some EMI housing shield is less

effective when this option is used, but on the other hand the sensor may be powered via these connections.

Note 1: To avoid ground loops, one should avoid connecting the analogue and digital grounds externally! They are connected

internally on the K30 PCB.

Note 2: The terminals are not protected against reverse voltages and current spikes! Proper ESD protection is required during

handling, as well as by the host interface design.

Default Functions / Configuration

Outputs

The basic K30‐STA configuration is a simple analogue output sensor transmitter signal directed to OUT1 and OUT2. Via the edge

connector serial communication terminal, the CO2 readings are available to an even higher precision (Modbus protocol), together

with additional system information such as sensor status, analogue outputs, and other variables.

Terminals

Output

Correspondence

OUT1

0,0…4,0 VDC

0…2,000 ppm CO2

OUT2

1,0…5,0 VDC

0…2,000 ppm CO2

Table 2. Default analogue output configuration for K30‐STA

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The basic K30‐STA configuration provides digital outputs to indicate if CO2 concentration exceeds alarm threshold.

Terminals

Output

Correspondence

OUT3

Logical levels:

Low < 0.75V

High = 5V

OUT4

Logical levels:

Low < 0.75V

High = 5V

Table 3. Default digital output configuration for K30‐STA

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 7.5 days interval and

slowly corrects for any long‐term drift detected as compared to the expected fresh air value of 400 ppm CO2.

Defaults

 K30 Sensors – ABC on by default

 K30 SDKs – ABC off by default

 For applications where the sensor will never read 400ppm (fresh) air, the K30 should be ordered with ABC disabled.

Manual Calibration

Rough handling and transportation may reduce 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, or if ABC is disabled, two switch inputs ‐ Din1 and

Din2 ‐ select of two prepared calibration codes. If Din1 is shorted to ground for a minimum of 8 seconds, the internal calibration

code bCAL (background calibration) is executed, in which case it is assumed that the sensor is operating in a fresh air environment

(400 ppm CO2). If Din2 is shorted for a minimum of 8 seconds, the alternative operation code CAL (zero calibration) is executed in

which case the sensor is assumed to be in a gas mixture free from CO2 (i.e. Nitrogen or Soda Lime CO2 scrubbed air).

Input Switch Terminal

(normally open)

Default function

(when closed for minimum 8 seconds)

Din1

bCAL (background calibration) assuming 400 ppm CO2 sensor exposure

Din2

CAL (zero calibration) assuming 0 ppm CO2 sensor exposure

Table 3. Switch input default configurations for K30

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