The KSH-III Opening Load Meter is developed to meet the practical needs of the water conservancy, hydropower, and hydrology industries. It is an intelligent gate opening measurement and control device that is relatively independent while also providing analog signal output for networking. This instrument adopts embedded microcomputer control technology, offering powerful functionality, stable and reliable performance, high precision, and strong anti-interference capability. It serves as an opening load measurement and control device for various gates, bridge cranes, gantry cranes, hoists, and other equipment. It is suitable for scenarios where the sensor and the actual gate opening have a linear relationship, such as with flat gates, as well as for nonlinear relationships, such as with radial gates and multi-layer steel cable drums. Nonlinear measurement uses a piecewise approximation method, dividing the entire range into several segments (this display divides it into 10 segments). Users only need to set the opening value at the end of each segment on the display based on actual measurements. For linear measurement, only the opening value at the end of the first segment needs to be preset.

The instrument can set various parameters and is equipped with flash memory to store various preset parameters, with data retention during power loss. It features RS485, relay, and 4–20mA output interfaces, facilitating the formation of a network control system.

Gate Opening Load Measurement and Control Instrument (measures one channel of opening and two channels of load)

II. Features

1. Fully digital calibration: All parameter settings are completed via four buttons on the panel. All set or calibrated parameters have power-off memory function.

2. The opening sensor does not require mechanical zero adjustment; software zero adjustment can be performed at any point.

3. Uses Modbus RTU communication protocol with selectable baud rates of 2400, 4800, 9600, and 19200. It can be directly connected to PLCs and upper computer configuration software that support the Modbus-RTU protocol.

4. Compact design, integrating gate opening and lifting load measurement. Features clear and intuitive Chinese LCD display for convenient human-machine interaction.

III. Technical Parameters

1. Measurement items: 1 channel of opening, up to 600 meters (MAX); 2 channels of load, up to 400 tons (MAX).

2. Resolution: Opening: 1 cm or mm; Load: 0.1 ton.

3. Measurement accuracy: Opening: ±2 cm (mm); Load: ±1% F.S ±1 digit.

4. Display method: 4*8 Chinese character library LCD display.

5. Connection method between sensor and display: 485 signal, 4-20mA signal - 4-core RVVP cable; SSI signal - 6-core RVVP cable; Gray code signal - 16-core RVVP cable.

6. Wired distance between sensor and display: SSI signal ≤ 200 m; Gray code, 4-20mA, 485 ≤ 1 km.

7. Remote data transmission method: 4-20mA current output, with settable corresponding range; 485 signal.

8. Alarm and control functions:

1) Alarm control signal: Relay contact. Contact capacity: 3A 24VDC, 3A 250VAC.

2) Upper limit: When the opening is greater than or equal to the upper limit value, the upper limit relay contact closes.

3) Lower limit: When the opening is less than or equal to the lower limit value, the lower limit relay contact closes.

4) Water filling: When the opening is within the water filling set and reset range, the relay closes.

5) Overload: When the left or right load value is greater than or equal to this value, the relay closes.

6) Underload: When the left or right load value is less than or equal to this value, the relay closes.