KS200 SF6 Micro Water Density Online Monitoring System Technical Questions Welcome to consult: 400-000-2589 to 1001 Main functions: (1) Online monitoring of SF6 gas humidity, density, and temperature; (2) Online monitoring of gas leaks and leak alarms; (3) The low-voltage alarm and locking device (4) can be automatically activated according to preset values or user specified values, and a reserved RS-485/CAN bus communication interface is provided; (5) Automatically draw trend charts of state changes through backend software; (6) Optional large screen LCD display for on-site display of real-time data, with screen protection and voice control display functions; (7) Handheld remote control sets alarm and lockout threshold values and display modes; (8) Fully sealed, anti-interference, suitable for outdoor and low-temperature environments; Product features: (1) The high-precision and high reliability transmitter adopts imported high stability sensors, which are corrected and compensated by the internal circuit of the transmitter, resulting in good output linearity and high accuracy; The external structure of the transmitter is also more suitable for measurement in high-frequency electric field environments. It is integrated with the circuit processing part to reduce interference coupling and improve the stability and reliability of the circuit's long-term operation. (2) Realize online monitoring and status maintenance. This transmitter can operate for a long time with a hanging line. The RS-485 communication interface equipped with it can upload monitoring data in real time to the monitoring center. When the measured gas index exceeds the standard, the monitor will automatically upload an alarm or lockout signal to the remote monitoring center according to the pre-set threshold, or directly activate the alarm or lockout device. The upper computer software can sample, store and monitor according to the set time and frequency .....

KS200 SF6 Micro Water Density Online Monitoring System

Technical questions are welcome to consult: transfer to 1001


Main functions：

(1) Online monitoring of SF6 gas humidity, density, and temperature;
(2) Online monitoring of gas leaks and leak alarms;
(3) Low voltage alarm and locking device can be automatically activated according to preset or user specified values
(4) Reserve RS-485/CAN bus communication interface;
(5) Automatically draw trend charts of state changes through backend software;
(6) Optional large screen LCD display for on-site display of real-time data, with screen protection and voice control display functions;
(7) Handheld remote control sets alarm and lockout threshold values and display modes;
(8) Fully sealed, anti-interference, suitable for outdoor and low-temperature environments;

Product Features:
(1) High precision and high reliability
The transmitter adopts imported high stability sensors, which have been corrected and compensated by the internal circuit of the transmitter, resulting in good output linearity and high accuracy; The external structure of the transmitter is also more suitable for measurement in high-frequency electric field environments. It is integrated with the circuit processing part to reduce interference coupling and improve the stability and reliability of the circuit's long-term operation.
(2) Realize online monitoring and status maintenance
This transmitter can be operated for a long time by hanging wires. The RS-485 communication interface equipped with it can upload monitoring data in real time to the monitoring center. When the measured gas index exceeds the standard, the monitor will automatically upload an alarm or lockout signal to the remote monitoring center according to the pre-set threshold, or directly activate the alarm or lockout device. The upper computer software can sample and store monitoring data according to the set time and frequency, and automatically plot the above data into a trend chart as needed for observation and analysis.
The application of SF6 gas comprehensive online monitoring technology can realize the status monitoring of circuit breakers, which is conducive to timely grasping the operating status of equipment, ensuring the safe and stable operation of the power system, enabling status maintenance, reducing maintenance costs and power outage time, and thus improving management level.

Technical specifications of transmitter

measurement parameters
Dew point range: -50...+20 ℃ Td/f
Pressure range: 0...+10 bar
Temperature range: -40...+80 ℃
calculation parameters
Convert to parameters under standard conditions of 20 ° C
Micro water content: 10... 20000ppm
Pressure value (density): 1 ..12 bar
SF6 mixed density: 0 ..100 kg/m3
The output parameters include: PPM20 (micro water at 20 ℃), P20 (pressure and density at 20 ℃), T (℃), Td (dew point), P (pressure), Tdatm (atmospheric dew point), density (kg/m ³)
precision
Dew point accuracy: ± 3 ℃ Td
Pressure value (density) accuracy: ± 0.1% FS
Temperature accuracy: ± 1 ℃
Sensor response time:
Dew point sensor: 2S (20 ℃)
Pressure sensor:<0.5S (20 ℃)
working environment
Transmitter operating temperature: -40...+80 ℃
Overload safety pressure: 20 bar
Relative humidity: 0~100RH%
Tested gases: SF6, SF6/N2 mixture
output
Communication method: RS485
Communication protocol: ModBus RTU
Transmission speed: 9600bps
General parameters
Working voltage: 18... 36VDC
Power:<3W
Weight: 361g
Protection level: IP65
Shell material: stainless steel
Joint material: stainless steel
Electrical connector: M12 connector
Mechanical interface: M30 * 1.5
Sealing method: O-ring (33 * 2.5mm)
Absolute leakage rate: ≤ 10-9Pa · m3/s (helium gas detection)
Rated inflation pressure: 0.6MPa abs





Install three-way valve

Engineering Installation

This project is mainly divided into three engineering stages: system and SF6 equipment docking, system circuit connection, and system debugging.

Laying cables

After the installation positions of the industrial computer, transmitter, and cabinet are determined, lay the cables in place.
1) Screen cabinet: The screen cabinet requires a 220VAC working power supply, and when wiring, the 220V power supply should be led to the screen cabinet (3 × 1 cable). A 4 × 0.5 shielded cable needs to be arranged between the cabinet and the transmitter (when there are many transmitters, they need to be divided into multiple groups, and each group must have one transmitter connected to the cabinet through a 4 × 0.5 shielded cable).
2) Industrial control computer and communication server: Installation of industrial control computer and communication server in the cabinet. The industrial computer is connected to the server through a network cable.
3) Transmitter: The transmitter is connected to the cabinet via a 4 × 0.5 cable.

Installation of transmitter

1Required materials:
(1) Cable: Choose RVVP4 * 0.5 specification cable. Use cold pressed terminals for wiring, as shown in Figure 1.

Figure 1
(2) Bellows: Use 3/8 "specification metal bellows (protective sleeve), connected as shown in Figure 2

Figure 2
(3) Required tools: wrench (selected according to the size of the self sealing valve joint), wire cutter, wire stripping cutter, flathead screwdriver, insulation tape, and dust-free cloth.

Figure 3
2Electrical wiring and installation of corrugated pipes
⑴ Electrical wiring: Connect according to Figure 4 and Table 1. If the circuit breaker/GIS equipment is grounded, the fifth wire (ground wire) may not be connected.

1	Positive pole of power supply (+24 VDC)
2	Negative pole of power supply (GND)
3	RS485A
4	RS485B
5	Shielded wire, grounded (if high-voltage equipment is connected to ground, it may not be connected)

Figure 4 M12 connector
Table 1: Wiring Table
⑵ Open the electrical connector as shown in Figure 5. Connect the wires according to the wiring holes marked on the electrical connectors. After connecting the cable, wrap it with insulating tape to prevent the cable from rubbing against the metal joint during shaking, which may cause the cable to peel and cause a short circuit, as shown in Figure 6.


Figure 5


Figure 6
⑶ Connect the electrical connector and the corrugated wave, as shown in Figure 7.

Figure 7
Finally, screw the electrical connector onto the electrical socket of the transmitter, as shown in Figure 8.

Figure 8
3Installation of dedicated three-way connectors
The fastening thread glue has been applied between the transmitter and the three ventilation chamber at the factory to prevent the transmitter from loosening during equipment vibration. And it has already been checked for leaks. So, during installation, do not turn the connection between the transmitter and the three-way chamber as indicated on the label. See figure

Figure 9
⑵ It is not recommended to apply lubricating silicone grease on the O-ring seal, as silicone grease can absorb water and cause deviation in micro water measurement.
Wipe off the dust on the O-ring seal ring and self sealing valve male head with a dust-free cloth. as shown in the figure

Figure 10

⑶ Install the transmitter facing downwards; Align the female head with the male head and gently push it in, allowing the male head to pass through the O-ring seal; Then use your hands to tighten the joint, and if you can't move it by hand, change the wrench to tighten the joint. as shown in the figure



⑷ Install the electrical connector onto the electrical socket of the transmitter, as shown in the diagram.

Install industrial computer and upper computer software

The industrial computer should be installed in the control cabinet (with reserved space in the control cabinet) and relevant background software should be installed.

system debugging

After the system is fully installed, technicians will debug and set up the entire system. This includes communication testing, calibration of on-site parameters such as temperature, humidity, density, etc


(1)Get address

Obtain (TX):

address	function code	Starting register address		number of registers		verification code
1 Byte	1 Byte	2 Bytes		2 Bytes		2Bytes
00	03	66	00	00	01	L CRC	H CRC

Response (RX):

address	function code	data length	address		verification code
1 Byte	1 Byte	1 Byte	2Bytes		2Bytes
Address	03	02	H Addr	L Addr	L CRC	H CRC

Error(RX):

address	error code	Error code	verification code
1 Byte	1 Byte	1 Byte	2Bytes
Address	83	01/02/03/04	L CRC	H CRC

Exception code:
01: Function code error
02: The starting address is incorrect, or the number of registers added to the starting address exceeds the range
03: Incorrect number of registers
04: Error reading register

Example:
TX：00 03 66 00 00 01 9B 53
RX：01 03 02 00 01 79 84

Default address value at factory: 0x01

(2)Set address
Setting (TX):

Old address	function code	register address		New address		verification code
1 Byte	1 Byte	2 Bytes		2 Bytes		2Bytes
Address	06	66	00	H	L	L CRC	H CRC

Response (RX):

Old address	function code	register address		New address		verification code
1 Byte	1 Byte	2 Bytes		2 Bytes		2Bytes
Address	06	66	00	H	L	L CRC	H CRC

Error(RX):

address	error code	Error code	verification code
1 Byte	1 Byte	1 Byte	2Bytes
Address	86	01/02/03/04	L CRC	H CRC

Exception code:
01: Function code error
02: Register address error
03: Incorrect number of registers
04: Write register error

Example:
TX：01 06 66 00 00 02 16 83
RX：01 06 66 00 00 02 16 83

(3)Read measurement parameters and calculate parameters

Read (TX):

address	function code	Starting register address		number of registers		verification code
1 Byte	1 Byte	2 Bytes		2 Bytes		2Bytes
Address	04	00	00	00	08	L CRC	H CRC

Response (RX):

address

function code

data length

data

1 Byte

1 Byte

1 Byte

8 *2 Bytes

Address

04

10

H pressure

L pressure

H temperature

L temperature

H density

L density

H P20

L P20

H dew point

L dew point

H PPM

L PPM

data				verification code
8 *2 Bytes				2Bytes
H Dew point corresponding to atmospheric pressure	L Dew point corresponding to atmospheric pressure	H Corresponding to PPM at 20 ℃	L Corresponding to PPM at 20 ℃	L CRC	H CRC

Error(RX):

address	error code	Error code	verification code
1 Byte	1 Byte	1 Byte	2Bytes
Address	84	01/02/03/04	L CRC	H CRC

Exception code:
01: Function code error
02: The starting address is incorrect, or the number of registers added to the starting address exceeds the range
03: Incorrect number of registers
04: Error reading input register

Example:
TX：01 04 00 00 00 08 F1 CC
RX：01 04 10 04 01 07 26 02 7A 04 07 F8 2F 03 F5 F8 23 03 EF 2E 65
Pressure: 0x0401
Temperature: 0x0726
Density: 0x027A
P20： 0x0407
Dew point: 0xF82F
PPM： 0x03F5
Dew point at atmospheric pressure: 0xF823
PPM corresponding to 20 ℃: 0x03EF

Stress
Pressure = ( Pressure High | Pressure Low ) / 1000 Bar

Pressure High = 0x04
Pressure Low = 0x01
Pressure = 0x0401 / 1000 = 1.025 Bar
If the unit used is MPa,
Pressure = 0x0401 / 10000 = 0.1025 MPa


temperature
若 ( Temperature High | Temperature Low ) <= 0x7FFF,
Temperature = ( Temperature High | Temperature Low ) / 100 ℃
conversely,
Temperature = ( Temperature High | Temperature Low – 0xFFFF ) / 100 ℃

Temperature High = 0x07
Temperature Low = 0x26
Temperature = 0x0726 / 100 = 18.30 ℃

Density:
Density = ( Density High | Density Low ) / 100 ㎏/m³

Density High = 0x02
Density Low = 0x7A
Density = 0x027A / 100 = 6.34 ㎏/m³

Corresponding to pressure at 20 ℃:
P20 = ( P20 High | P20 Low ) / 1000 Bar

P20 High = 0x04
P20 Low = 0x07
P20 = 0x0407 / 1000 = 1.031 Bar
If the unit used is MPa,
P20 = 0x0407 / 10000 = 0.1031 MPa


the dew point:
若 ( Td High | Td Low ) <= 0x7FFF,
Td = ( Td High | Td Low ) / 100 ℃
conversely,
Td = (Td High | Td Low – 0xFFFF ) / 100 ℃

Td High = 0xF8
Td Low = 0x2F
Td = ( 0xF82F – 0xFFFF) / 100 = -20.00 ℃
PPM：
PPM = PPM High | PPM Low

PPM High = 0x03
PPM Low = 0xF5
PPM = 0x03F5 = 1013

Dew point at atmospheric pressure:
若 ( Td(atm) High | Td(atm) Low ) <= 0x7FFF,
Td(atm) = ( Td(atm) High | Td(atm) Low ) / 100 ℃
conversely,
Td(atm) = ( Td(atm) High | Td(atm) Low – 0xFFFF ) / 100 ℃

Td(atm) High = 0xF8
Td(atm) Low = 0x23
Td(atm) = ( 0xF823 – 0xFFFF ) / 100 = -20.12 ℃

Corresponding PPM at 20 ℃:
PPM20 = PPM20 High | PPM20 Low

PPM20 High = 0x03
PPM20 Low = 0xEF
PPM20 = 0x03EF = 1007

The returned temperature, dew point, and dew point at atmospheric pressure are 2-byte signed integers. The pressure and density correspond to the pressure at 20 ℃, PPM， The PPM at 20 ℃ is a 2-byte unsigned integer.
The pressure and the corresponding pressure at 20 ℃ are expressed in absolute pressure. If converted to relative pressure, subtract the local atmospheric pressure.