# Mechanical Installation
### **Extremely** Important! Read Before Installation
The following improper usage or installation practices may damage the flowmeter and reduce product lifespan. Such damage is **not covered under warranty**.
* If the device material is PC then it is not highly resistant to PVC glue which is a strong gas and lubricant for PVC pipe. Therefore, before installing the flowmeter you must ensure that the glue is dry between the connecting pipe and adapter.
* Please pay special attention to the vertical flow of solvents and chemicals outside the pipeline since it may potentially cause damage to the flowmeter
* Do not use this device as a support point for pipelines or other objects, which will cause the flowmeter to withstand external forces which it is not designed for, thus , shortening the usage life of the product or damaging it.
* During the installation process, it’s crucial to tighten the union nuts only by hand until the flowmeter does not move and rotate. Do not use iron pliers or other tools to avoid damage to the flowmeter.
* The flowmeter is not permanently fixed to the outside of the pipeline, and can still move and rotate under excessive external force. Please do not use the flowmeter as a structure for personnel fixing, moving and safety protection.
* The electronic device of the flowmeter is not UV resistant. Therefore, we suggest covering it with a protector if installed outdoors.
* The seller will not be responsible for free maintenance for any defect or malfunction incurred by improper use and human errors.
* If the flowmeter is transported with its piping system to another site without protection then it could be damaged.
* The LCD display screen should not be exposed to direct sunlight that could cause visibility issues and a shorter life usage. Therefore, installing the flowmeter under direct sunlight should be avoided or with a sunlight protector is recommended.
{% hint style="danger" %}
**Caution – Do Not Over-Tighten:** During installation, tighten screws until snug. Once the screw feels slightly tightened, any additional tightening must not exceed **0.4 N·m (4.0 kgf·cm)** to avoid damage to the unit. For plastic tubing, ensure that excessive downward pressure does not cause deformation; reduce torque as necessary.
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## Installation Guide
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### Selecting Installation Location
* **Ensure Full Pipe:** Install the flowmeter on a fully filled vertical pipe segment. If installed on a horizontal pipe, avoid areas prone to air bubble accumulation (top of pipe) or sediment deposition (bottom of pipe). Presence of air bubbles may cause large, non-repeatable measurement errors.
* **Install on Fully Developed Flow:** Mount the flowmeter on a pipe section with uniform, stable flow. Avoid locations near components that disturb flow, such as pipe reducers, elbows, valves, or pumps.
* **Protect the Main Unit:** Do not expose the LCD directly to sunlight. If necessary, add a sunshade. Direct sunlight can reduce readability and shorten LCD lifespan.
#### Straight Pipe Requirements – 10D / 5D Guideline
To ensure stable and uniform flow for accurate measurement, install the flowmeter away from components that may disturb flow velocity. Follow these guidelines:
* **Upstream (before the flowmeter):**\
Provide a minimum straight pipe length of 10 × pipe diameter (10D). Do not place elbows, tees, valves, reducers, expanders, pump outlets, or any component that may disturb the flow.
* **Downstream (after the flowmeter):**\
Provide a minimum straight pipe length of 5 × pipe diameter (5D) to prevent downstream pressure fluctuations from affecting measurement stability.
* **Installation Direction:**\
Align the flowmeter according to the flow direction arrow on the housing. Ensure it matches the actual flow direction.
```
Example: Straight Pipe Lengths for DN25 (25 mm Nominal Diameter)
Pipe Diameter (D): 25 mm
Upstream Straight Pipe: 10 × D = 10 × 25 mm = 250 mm (~25 cm)
Downstream Straight Pipe: 5 × D = 5 × 25 mm = 125 mm (~12.5 cm)
```
**Additional Recommendations**
* For sites near pumps, strong pulsations, or multiple upstream/downstream fittings, increase upstream straight pipe to 15–20 × D or use a flow conditioner.
**Avoid Installing the Flowmeter Near:**
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| Near Pumps | Near Valves |
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| Near Tees, reducers, or expanders | Near Elbows |
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{% step %}
### Installation Orientation & Flow Direction
#### Installation Orientation
* Vertical Pipe: Install the flowmeter on upward flow.
* Horizontal Pipe: Install at a fully filled section, e.g., the lower side of a sloped pipe or the bottom of a U-shaped pipe.
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| ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
***
**Flowmeter Orientation**
Install the flowmeter on the side, slightly above, or slightly below the pipe. Avoid the top or bottom to prevent interference from bubbles or sediment.
* **Recommended Positions: Side, Slanted Upward, Slanted Downward**
* **Avoid:** Right Above or Right Beneath
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{% step %}
### FU-ES Device Installation Steps
{% hint style="danger" %}
#### **Caution – Do Not Over-Tighten:** Tighten screws until snug. Maximum torque **0.4 N·m (4.0 kgf·cm)**. Excess torque may damage the flowmeter.
**Screw Identification**
🔴 **Side cover fixing screws:** Marked in red. Do not rotate during normal installation. Avoid turning unless necessary.
🔵 **Sensor Pressing Screws:** Marked in blue. Adjust sensor contact tightness with the pipe.
🟢 **Hex socket screws:** Marked in green. Secure the upper and lower clamps to the pipe.
{% endhint %}
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### How to Rotate the Display Screen Direction
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### Power off and remove the power cable
Before opening the housing or performing any wiring work, turn off the power and remove the power cable.
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### Loosen the housing cover screws and separate the top and bottom covers
Using a hex key, loosen the **4 housing cover screws** and separate the top cover from the bottom cover. Multiple wires connect the top cover to the housing — carefully detach the covers and **do not pull the wires**.
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### Rotate the housing to the desired orientation
Rotate the top cover to the required angle. **Do not rotate more than one full turn**, as excessive rotation places unnecessary tension on the wires and connectors, which may affect long-term reliability.
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### Reassemble the covers and tighten the screws
The bottom cover has a sealing O-ring seated in the groove around the screw holes. Confirm that the groove is free of debris to ensure waterproofing is not compromised. Reattach the top cover to the bottom cover and evenly tighten the **4 housing cover screws**.
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Do not overtighten. Excessive torque may damage the product.
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---
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***
**Flowmeter Orientation**
Install the flowmeter on the side, slightly above, or slightly below the pipe. Avoid the top or bottom to prevent interference from bubbles or sediment.
* **Recommended Positions: Side, Slanted Upward, Slanted Downward**
