In-situ water level display device

Measuring range: 0-100.00mH2O
Output signal: 4-20mA
Protection level: IP68
Temperature compensation: -20-85℃
Accuracy: 0.1%FS, 0.25%FS, 0.5%FS
Certification Information:
1 CE FCC RoHS
2 Fire safety third-party inspection report
3 This product has been tested by SGS and the error is 0.009mA
Suitable for remote transmission of water level in fire water tanks and pools
Built-in WHSENSORS Brand sensor chip, signal can be transmitted up to 5000 meters

Classification:

Level Measurement

Keyword:

Overview
Overview
Specs
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Applications

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 should be set up in the fire control center or duty room, etc., to display the water level of the fire water pools; they should also have high and low alarm water levels.
Figure 1

II. Schematic Diagram of the Scheme
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 a 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 transmission range up to 5000 meters) on the WH6-T display in the pump room;
3. Transmit the level signal to the WH6-T light column intelligent level display in the fire control room 4000 meters away, which has high and low level alarms. This completes our "one-to-two" display.
The following "one-to-two" display design institute diagram 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, red line to terminal 4, green line to terminal 1. Short-circuit terminals 2 and 3 with a jumper wire. The WH6-T's terminals 23 and 24 provide 220V power; the WH6-T's built-in 24V power module automatically powers the probe WH311. After the wiring is complete, the display screen will show the current fire water level in real time; the user sets the AH high-level alarm value and AL low-level alarm value according to 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-specific display is installed in the fire control center. Connect the signals 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, so that the display in the fire control room will also synchronously display the actual water level of the fire water pool in real time, with intelligent light column percentage display.
4. Set the high and low level alarm values. When AL is set to 0.5 meters (this value can be set by the user), the relay is activated, the alarm (to be provided by the user) is connected, and an audible and visual alarm is issued, thus realizing the low water level alarm function. When AH is set to 4.5 meters (this value can be set by the user), the relay is activated to achieve a high water level alarm.
This achieves the user's requirement to display the fire water pool water level in two places and automatically alarm for high and low water levels. The detailed wiring diagram is as follows.
Figure 3 Wiring Diagram

IV. User Adoption Scheme, Wanhe Instrument Construction Site Diagram

Pool #1
Pool #2
Pool #3
Pool #4

On-site Video