The KSS574 is a gas sensor based on the principle of NDIR infrared absorption, suitable for testing methane gas concentrations in industrial applications.

KSS574 adopts a patented optical cavity, imported light source and dual-channel detector to realize the reference compensation of dual optical paths in space. KSS574 has good selectivity, no oxygen dependence and long life.

KSS574 has a UART output mode, provides zero point calibration, sensitivity calibration and clean air calibration commands, and provides customers with a manually calibrated MCDL pin, which is convenient for customers to use outdoor free flow clean air to perform relative zero calibration of the sensor module.

The KSS574 adopts diffusion ventilation method and has a response time of less than 30 seconds. KSS574 is suitable for petrochemical power and other applications.

The KSS574 is available in a variety of packages that can be customized according to customer needs. There are three common packages: package one, package two (six pins 4-20mA), package three (seven pins 485 interfaces), of which package two and package three are the same size.

2. Technical Parameters

parameter		symbol	minimum	Typical values	maximum	unit
Storage Temperature		T_stg	-20	-	80	°C
Operating Temperature		T_A	-20		60	°C
Operating Humidity		H_A	0		90	% RH
Work Pressure		P_A	0.8		1.2	atm
Supply Voltage		V_s	9	12	18	V
Maximum Operating Current		I_avg	100	120	150	mA
Detection Range (customizable).		Ra	0	50000		ppm
Resolution		Resolution		1000		ppm
Measurement Accuracy		Acurracy		± 50ppm or ±5% truth value is the greater		%vol
T90 pipeline type	diffusion			30		second
Repeatability	Zero			Less than ±50		ppm
Repeatability	Range			Less than ±5% of the measured value
life span			3	5	10	year

3. Structural Dimension Drawing

Unit: mm

Package a structural dimension drawing

Package 2 (6-pin 4-20mA).

Package three (seven-pin 485 connectors).

4. Installation instructions

The sensor mounting thread dimensions refer to the block diagram.

5. Matters that should be paid attention to in maintenance

The sensor should be calibrated regularly, it is recommended that it should not be more than 3 months;

Do not use the sensor for a long time in an environment with high dust density;

Please use the sensor within the range of the sensor's power supply.

6. Ordering Instructions

In order to be able to purchase the specific specifications required, please provide the following information

1) Sensor name

2) Sensor range

3) Sensor measurement accuracy and output mode, etc

For example, SW741, 0-50000ppm, ±5% of the reading or 50ppm whichever is the largest;

7. Order Information

Order information sheet
KSS574	KSS574 CO2 concentration sensor
	xxxx	The sensor measures the range of CO2 concentration in ppm, with a minimum value of 2000 and a maximum value of 50000 ppm.
	2000	Range 200ppm (default).
	10000	Range 10000ppm
	50000	Range 50000ppm
		encode	The reaction speed is divided into two types: fast and slow
		S	Slow (default).
		Q	fast
			encode	Baud rate selection, support commonly used baud rate 2400 9600 19200 38400bps, 8 bits of data, 1 bit of stop bit, no check bit: Confirm special needs before ordering.
			Custom	Confirm the baud rate before ordering
			2400	2400bps baud rate
			9600	9600bps baud rate
			19200	19200bps baud rate
			38400	38400bps baud rate (default)
				encode	Serial port protocol
				Modbus-RTU	Standard Modbus-RTU protocol (default).
				Modbus-ASCII	Standard Modbus-ASCII protocol
				Modbus-Self	Modbus private protocol
KSS574	-2000	-S	-38400	-Modbus-RTU

8. Contact Details

URL: www.kacise.com

Tel: +86-29-17719566736

Email: sales@kacise.com

Address: Tangyan South Road, Xi'an City, Shaanxi Province, China

Appendix

Shorthand	Full name
VOL	1% VOL refers to 1% of the volume of a particular gas in air.
PPM	1PPM means that the volume of a specific gas in the air accounts for one millionth.
O2	Oxygen molecules
LCD	LCD display
RS485	Asynchronous serial port 485
DC	direct current
AC	Communication
PVC	polyvinyl chloride