SF6+T gas transmitter

NegotiableUpdate on 01/18

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

The SF6+T gas transmitter includes a sulfur hexafluoride detection unit and a communication unit. The use of domestic detection technology for sulfur hexafluoride detection overcomes the disadvantages of short service life and poor stability; The oxygen detection unit adopts sensors imported from the UK, with high measurement accuracy and stable performance; In summary, the gas detector can monitor the changes in SF6 gas concentration and oxygen content in the environment in real time and online, and upload the detected data through the RS-485 bus.

Product Details

1SF6+T gas transmitterFeature Overview

The gas transmitter includes a sulfur hexafluoride detection unit and a communication unit. The use of domestic detection technology for sulfur hexafluoride detection overcomes the disadvantages of short service life and poor stability; The oxygen detection unit adopts sensors imported from the UK, with high measurement accuracy and stable performance; In summary, the gas detector can monitor the changes in SF6 gas concentration and oxygen content in the environment in real time and online, and upload the detected data through the RS-485 bus.

2. Main technical indicators

☆ SF6 gas concentration measurement range: 0-3000 μ V/V (ppm) better than 50 μ V/V

☆ SF6 gas detection sensitivity: 50 μ V/V (ppm)

☆ Working power supply: DC24V

☆ Communication interface: RS 485

☆ Communication protocol: Modbus protocol RTU transmission CRC16 verification

The external dimensions are: 162mm × 150mm × 40mm

3SF6+T gas transmittercommunication protocol

(1) Communication format

The basic format for communication using Modbus RTU is as follows:

Device address	Function code	data	CRC check
1 byte	1 byte	N bytes	2 bytes

Function code definition:

Component type first address reading function code multi-channel writing

D (analog quantity) 1000H 03H 10H

Note 1: Broadcast address: 0xFF

Note 2: Data representation: All data is transmitted in hexadecimal format, and the register data type is "word" (two bytes), divided into two bytes for transmission, with the high-order byte at the beginning and the low order byte at the end.

data information

Corresponding to the PLC name	address	Signal significance	Remarks
Analog quantity (acquisition quantity): The maximum number of registers written to each read is 64
D0	1000H	SF6 gas content	The SF6 gas content and humidity are based on raw data, with high values at the beginning and low values at the end, such as: The SF6 gas content is represented by two bytes, for example, 1500ppm is represented as 05H, DCH; O2 content and temperature value Upload value=measured value * 10 The O2 content is represented by two bytes, such as 25.0% representing 00H and FAH; The temperature value is represented by two bytes, for example, 25.0 ℃ is represented as 00H, FAH; Upload value=measured value * 10+500 The humidity value is represented by two bytes, such as 32% representing 00H and 20H;
D1	1001H	O2 content
D2	1002H	temperature value
D3	1003H	humidity value
D4	1004H	Device number

(2) Detailed explanation

2.1 The format of the read instruction issued by the upper computer is:

Lower computer address	function code	Register first address	number of registers	checksum
1 byte	1 byte	2 bytes	2 bytes	2 bytes

Note 3: The checksum is a 16 bit CRC checksum, which covers all data except for the checksum value. The 16 bit CRC checksum value is divided into the lower 8 bits and the upper 8 bits represented in hexadecimal, with the lower bits before and the higher bits after. For example, if the checksum is D841H, it is represented as 41H D8H.

2.2 The format of the lower computer's response to read instructions is:

localhost	function code	Number of bytes	data segment	checksum
1 byte	1 byte	1 byte (n)	2n bytes	2 bytes

Note 4: The representation of byte count is the same as the data representation in Note 2. For example, if the data segment has 123 bytes, it is represented as 00H and 7BH.

2.3 The format of the write instruction issued by the upper computer is:

Lower computer address	function code	Register first address	number of registers	data segment	checksum
1 byte	1 byte	2 bytes	2 bytes (n)	2n bytes	2 bytes

2.4 The format of the response command from the lower computer is:

Lower computer address	function code	Register first address	Number of successful operation registers	checksum
1 byte	1 byte	2 bytes	2 bytes	2 bytes