SF6+O2 gas transmitter (black shell)

NegotiableUpdate on 01/18

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

The SF6+O2 gas transmitter (black shell) includes a sulfur hexafluoride detection unit, an oxygen detection unit, a temperature and humidity detection unit, and a communication unit. The detection of sulfur hexafluoride uses ultrasonic sensor monitoring technology to overcome 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. This gas transmitter can monitor the changes in SF6 gas concentration, oxygen content, and environmental temperature and humidity in real-time and online, and upload the detected data through RS485 bus.

Product Details

Overview

SF6+O2 gas transmitter (black shell)Including sulfur hexafluoride detection unit, oxygen detection unit, temperature and humidity detection unit, and communication unit, the detection of sulfur hexafluoride adopts ultrasonic sensor monitoring technology to overcome 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. This gas transmitter can monitor the changes in SF6 gas concentration, oxygen content, and environmental temperature and humidity in real-time and online, and upload the detected data through RS485 bus.

SF6+O2气体变送器（黑壳)

SF6+O2 gas transmitter (black shell)Technical Specifications

rated voltage	DC24V±20%
measurement range	SF6 gas concentration measurement range: 0-3000 μ V/V (ppm) Oxygen measurement range: 0-25% Temperature measurement range: -40 ℃~120 ℃, humidity measurement range: 0~100% RH
measurement accuracy	Temperature: ± 0.5 ℃, humidity: ± 3% RH
output interface	RS485
communication protocol	MODBUS RTU
Mailing Address	1-255 (adjustable)
Baud rate	4800 bit/s（0,8,1）
average power consumption	＜3W
Product dimensions	152mm×150mm×40mm

communication protocol

Function code definition:

Component type first address reading function code multi-channel writing

D (analog quantity) 1000H 03H 10H

data information

name	address	Signal significance	Remarks
Analog quantity (acquisition quantity): The maximum number of registers written to each read is 64
D0	1000H	SF6 gas concentration	The SF6 gas content is represented by two bytes, for example, 1500ppm is represented as 05H, DCH; SF6 upload value=measured value
D1	1001H	O2 content	The O2 content is represented by two bytes, such as 25.0% representing 00H and FAH; O2 content upload value=measured value * 10
D2	1002H	temperature value	The temperature value is represented by two bytes, for example, 25.0 ℃ is represented as 00H, FAH; Temperature upload value=measured value * 10+500
D3	1003H	humidity value	The humidity value is represented by two bytes, such as 32% representing 00H and 20H; Humidity upload value=measured value
D4	1004H	Device number

(1) Communication format

The basic format for communicating via Modbus RTU is as follows:

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

(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: 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: 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

Example of Address Code

SF6+O2气体变送器（黑壳)