L-com SRAQ-G208 Bedienungsanleitung

LIQUEFIED NATURAL GAS & LIQUEFIED PETROLEUM GAS TRANSMITTER

User Guide for SRAQ-G208

Thank you for choosing L-com product. To ensure safe, accurate performance and product longevity, please take a moment to familiarize yourself

with this manual before powering the device. Please keep it handy for future reference. In case of any questions regarding the installation or use of

product, please call us at 800.341.5266.

Reach out to us at customerservice@l-com.com and visit our website at www.l-com.com

M_L-com_SRAQ-G208_11/2022_R1.0

Product Description

The SRAQ-G208 gas transmitter detects the presence and concentration of liquefied petroleum gas as well as liquefied natural gas. Integrated

circuitry produces a non-linear voltage signal corresponding to the gas concentrations. With high sensitivity to butane, propane and methane, the

SRAQ-G208 has a detection range of 300 to 10000 ppm. It is well suited for detecting LPG and LNG leaks and triggering alarms.

Features

 High sensitivity to LNG / LPG

 24 VDC power supply

 Wide detection range 300  10000 ppm

 Analog and TTL level outputs

 Wall or DIN rail mountable

Applications

 Industrial settings

 Chemical manufacturing

 Portable gas detectors

 Anywhere LNG or LPG concentration is a concern

Technical Parameters

Detection Range 300  10000 PPM

Measured Gas LPG, Methane, Propane, Butane, Hydrogen

Working Voltage 24 VDC ± 0.2 V

Output Method 0  10 V (Non-linear)

Response Time ≤1 sec

Recovery Time ≤30 sec

Working Temperature -20~65 °C

Working Humidity <95% RH (Non condensing)

Preheat Time >30 mins

Mounting Diagram

1. Wall mount, hole diameter 4 mm, pitch 36 mm

2. DIN 35mm rail mount

Notes

1. Confirm the polarity and the voltage of the power supply before powering ON the sensor.

2. The analog output of this module is non-linear. When connect to microcontroller, it should be connected to ADC interface of the microcontroller.

3. The relationship between the resistance ratio and the concentration is a logarithmic relationship.

Electrical Diagram

1. 24V and GND are the power interface, D1 is the power indicator.

2. Aout is the analog output interface, VR2 is the signal trimmer potentiometer.

3. VR1 is the magnification (the output of 0-5V and 0-10V can be adjusted freely through this potentiometer).

4. The load resistance of the sensor composed of R7 and RP2 potentiometer is in parallel relationship (can be changed by user).

5. Different sensors use different parameters. The parameters are based on the PCB board.

Typical Sensitivity Curve

The calculation of the resistance ratio according to the output voltage is as follows:

The sensor is energized in relatively clean air for more than half an hour and after measure the output voltage value of Aout.

VCC is the power supply voltage, 5 VDC

RL is the load resistance

VRL = Aout = Vair value

When the sensor detects gas, the RS value can be calculated after measuring the value of Aout.

The VRL value at this time is the Aout value after gas is detected. It is different from the value of the above formula. The VCC value and the RL value

are the same as above.

The R0 and RS values are obtained, and the specific concentration value of the gas is converted by the RS / R0 value of the Sensitivity Characteristic

Curve (To get 0-10V output, through 0-5V, the circuit is enlarged 2 times, so use the calculation method accordingly. VCC is based on 5V as the

benchmark).

The ordinate in the figure is the resistance ratio of the sensor (Rs/R0). The abscissa is the gas concentration. Rs represents the resistance value of the

sensor in different concentrations of gas, and R0 represents the resistance value of the sensor in clean air. All tests in the figures were done under

standard test conditions.

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