Hongshan 6979 Commercial Complex:Fire Protection Water Level Monitoring

Case Description

I. Typical User Specific Needs

User: Hongshan 6979 Commercial Center

Needs: Hongshan 6979 Commercial Center is one of the landmark buildings in Longhua, Shenzhen.
Hongshan 6979 Commercial Center has four fire water pools, distributed around the underground parking lot, with a water depth of 6 meters and a distance of approximately 3000-4000 meters from the fire control room. The user now requires, according to the fire construction code "GB 50974-2014 4.3.9 clause" (see Figure 1) -- Fire water pools should be equipped with on-site water level display devices, and devices displaying the water level of the fire water pools should be installed in the fire control center or duty room, etc., and there should be high and low alarm water levels.

Figure 1

II. Schematic Diagram

Design and development of a fire water pool level on-site display device and a dual display solution in the fire control room that meets the requirements of the new fire code:
1. Use one level sensor probe with two level displays, one for on-site display in the user's pump room;
2. Install a 4-20mA remote transmission module (signal can be transmitted 5000 meters) on the pump room display WH6-T;
3. Transmit the level signal to the WH6-T intelligent light column level display in the fire control room 4000 meters away, with high and low level alarms. This completes our "one-to-two" display.
The following one-to-two display design institute sample drawing is for reference.

Figure 2 Design Institute Design Drawings

III. Specific Wiring Scheme Description

1. Directly place the WH311 fire-proof lightning protection level sensor probe into the bottom of the fire water pool;
2. Connect the level probe signal line to the WH6-T on-site level display in the pump room via a 2*1.5 square RVVP cable, the red line to terminal 4, and the green line to terminal 1. Short-circuit terminals 2 and 3 with a short-circuit wire. The WH6-T's terminals 23 and 24 provide a 220V power supply. The WH6-T's built-in 24V power supply module will automatically supply power to the probe WH311. After the wiring is completed, the display screen will display the current fire water level height in real time; the user sets the AH high-level alarm value and AL low-level alarm value according to the requirements.
3. Transmit the 4-20mA signal of the pump room display WH6-T output module to the fire control room via a 2*1.5 square RVVP cable. Another WH6-T fire-proof display is installed in the fire control center. Connect the signal of terminals 5 and 6 of the on-site level display output module to terminals 1 and 2 of the fire control room WH6-T display instrument, so that the display in the fire control room will also synchronously display the actual water level height of the fire water pool in real time, with percentage intelligent light column display.
4. Set the high and low level alarm values. When AL is set to 0.5 meters (this value can be set by yourself), the relay will operate, the alarm (needs to be provided by the user) will be connected, and an audio-visual alarm will be issued, thus realizing the low water level alarm function. When AH is set to 4.5 meters (this value can be set by yourself), the relay will operate, realizing the high water level alarm.
This realizes the user's requirement to display the fire water pool water level in two places, with high and low water level automatic alarm function. The detailed wiring diagram is as follows.