KSS591 Infrared Methane Gas Sensor Module
1. Overview
KSS591 is a gas sensor module using NDIR infrared absorption detection principle, which determines the concentration according to the radiation absorption of infrared light source by CH4 gas. KSS591 adopts imported light source, optical cavity with special structure and dual-channel detector to realize space dual optical path reference compensation, and microprocessor for signal acquisition, processing and output. KSS591 has good selectivity, high sensitivity, no oxygen dependence, long life, low power consumption; Built-in temperature sensor for temperature compensation; At the same time, it has UART, 485 (modbus user selectable protocol) output and 4~20mA analog current/voltage output; Convenient for customers for various applications.
2. Technical parameters
| parameter | symbol | minimum | Typical values | maximum | unit |
| Storage Temperature | Tstg | -20 | - | 80 | °C |
| Operating Temperature | TA | -20 | | 60 | °C |
| Operating Humidity | HA | 0 | | 90 | % RH |
| Work Pressure | PA | 0.8 | | 1.2 | atm |
| Supply Voltage | Vs | 11 | 12 | 30 | V |
| Maximum Operating Current | Iavg | 100 | 120 | 150 | mA |
| Detection Range (customizable). | Ra | 0 | 50000 | | ppm |
| Measurement Accuracy | Acurracy | | ± 50ppm or ±5% truth value is the greater | | %vol |
| T90 Pipeline Type | Pump suction | | | 5 | | second |
| diffusion | | | 30 | |
| Repeatability | zero | | | Less than ±50 | | ppm |
| 50%F.S. | | | Less than ±5% of the measured value | | |
| Life Span | | | 10 | | year |
3. Structural Dimension Drawing
Unit: mm
Pump suction structure dimensional drawing
Dimensional drawing of diffused structure
4. Installation instructions
The sensor is installed with a reference structure diagram with a positioning hole spacing and an aperture of 3.2mm.
The wiring socket spacing is 2.54mm.
5. Matters and methods that should be paid attention to in maintenance
The sensor should be calibrated regularly, not more than 3 months is recommended.
Do not use the sensor for a long time in an environment with a high density of dust.
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
- Sensor name
- Measure the gas
- Sensor range, etc
For example, SW541, CH4, 0-50000 ppm
7. Order Information
| Order information sheet |
| KSS591 | KSS591 methane concentration sensor |
| xxxx | The sensor measures the range of methane 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 |
| KSS591 | -2000 | -S | -38400 | -Modbus-RTU | |
8. Contact
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 |
