2018
06-27
AN-009 Cross-sensitivity compensation method of LARK-1 CO sensor responding to CO2 EN
2018
06-27
AN-008 EN LARK-1 4-20mA MODBUS PROTOCOL 2022-06-14
The LARK-1 sensor can communicate with a host device via an RS232 interface. We developed RS232-RS485 MODBUS Converter with 4-20mA analog output for LARK-1 in order to speed up users’ development speed. RS232 of the converter is terminated with LARK-1. The Modbus terminal and 4-20mA analog output is connected to host device. This application note shows how to operate LARK-1 via Modbus protocol using this converter and obtain gas concentration via 4-20mA analog output.
2018
06-27
AN-007 LARK-1S MODBUS PROTOCOL EN 2022-06-20
The LARK-1S sensor can communicate with a host device via an RS485 interface. This application note shows how to operate LARK-1S with Modbus protocol, including sensor information inquiring, data logging, ZERO and SPAN calibration
2018
06-27
AN-006 How to Get VOC Gases with Gas Sampling Bags EN 19-11-07
LARK-1HR i-C4H8 (high-resolution isobutylene) is a NDIR sensor developed by Promisense, which can be used to detect the concentration of various VOCs, including benzene, toluene, xylene, methanol, n-hexane and so on. In other words, VOC gas sensors could be calibrated with isobutylene. We measured the cross response of LARK-1HR i-C4H8 to various VOCs and presented cross sensitivity data in AN-005.
2018
06-27
AN-005 Cross-Response of LARK-1 i-C4H8 to HC EN 20-09-27
LARK-1HR i-C4H8 (high-resolution isobutylene) is a NDIR sensor developed by Promisense, which can be used to detect the concentration of various VOCs, including benzene, toluene, xylene, methanol, n-hexane and so on. In other words, VOC gas sensors could be calibrated with isobutylene.
2018
06-27
AN-002 Effect of Humidity on NDIR LARK-1 CH4 Reading EN 19-11-22
The NDIR gas sensor generally presents the range of gas humidity in datasheet which can ensure the normal performance of sensors. High humidity will not damage the sensor with no condensing. But it will increase error between Reading of sensor and concentration of target gas. Taking methane gas sensor as an example, in the case of high humidity, the Reading of sensor is generally higher than gas concentration. We pumped gases with different humidity into NDIR LARK-1 CH4 and analyzed the experimental data to study effect of humidity on Reading.
2018
02-18
How to Prepare VOC 2018-08-10 with Air Bag in AN-006
The NDIR sensor LARK-1HR i-C4H8 (high resolution isobutylene) developed and manufactured by Normalized Core can be used to detect various kinds of isobutylene. VOC gas concentration, including benzene, toluene, p-xylene, methanol, n-hexane and so on. Equivalent to the use of isobutene i-C 4H 8 as Calibrator of VOC sensor. We measured the cross-response of LARK-1HR i-C4H8 to a variety of VOCs, and at AN-005. The cross sensitivity is given. So how to get a fixed concentration of VOC gas? Simply put, the corresponding VOC The solute and pure nitrogen N 2 of the chemicals can be filled into the air bag according to the calculated amount and wait for volatilization. So how to calculate and use which tools The solute and N 2 are filled into the air bag, which is the content of this article.
2018
02-18
Cross Response of AN-005 LARK-1HR i-C4H8 to Various VOCs
The NDIR sensor LARK-1HR i-C4H8 (high resolution isobutylene) developed and manufactured by Normalized Core can be used to detect various kinds of isobutylene. VOC gas concentration, including benzene, toluene, p-xylene, methanol, n-hexane and so on. Equivalent to the use of isobutene i-C 4H 8 as Calibrator of VOC sensor. To detect the concentration of various VOC gases with LARK-1HR i-C4H8 sensor, it is necessary to know The channel corresponds to the cross sensitivity of VOC gas to i-C 4H 8. For this purpose, we measured LARK-1HR i-C4H8 pairs of VOCs. The cross-sensitivity of gas is calculated. The cross-sensitivity data given in this paper can be directly used by customers in need. It should be noted that the data in this paper are only valid for LARK-1HR i-C4H8 sensors developed and manufactured by our company.
2018
06-27
AN-004 Negative-Drift Compensation for NDIR LARK-1 EN 19-11-12
LARK-1 reading which is the concentration value of target gas sometimes may be negative when the zero gas is present in the sensor. Why is the gas concentration negative? NDIR sensors almost have a certain degree of zero drift, and they need to be calibrated regularly. Most NDIR sensors have been set a “deadband” to negative reading. However, we don’t set this “dead-band” to LARK-1 raw reading. So, the reading for zero gas may be negative if it drifts down.
2018
06-27
AN-003 EN LARK-1 MODBUS PROTOCOL 2022-05-19
The LARK-1 sensor can communicate with a host device via an RS232 interface. We developed RS232-MODBUS Converter for LARK-1 in order to speed up users’ development speed. RS232 of the converter is terminated with LARK-1, and the Modbus terminal is connected to host device. This application note shows how to operate LARK-1 via Modbus protocol using this converter, including LARK-1 information inquiring, data logging, ZERO and SPAN calibration.