# Mechanical Installation
### **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**.
* The main unit housing is made of plastic and is **not resistant** to PVC cement, volatile solvents, or PVC pipe lubricants (oil, grease). **Install the unit only after all PVC solvents near the installation site have fully cured and dried.**
* Be cautious of solvents or chemicals running along the outside of pipes. **Dripping onto the flowmeter may cause cracks or structural damage.**
* Do **not** use the flowmeter as a support point for pipes or other objects. Exposing it to mechanical forces beyond design limits may cause damage or shorten its lifespan.
* When tightening clamps, **use hands only** until the unit no longer moves or rotates. Do **not** use wrenches, pliers, or other tools to avoid structural damage.
* The flowmeter is **not permanently fixed**. It may move or rotate under excessive external force. Do **not** use it as a structural anchor for personnel or safety purposes.
* Prolonged exposure to UV light may cause **discoloration and material aging**. For outdoor use, install a protective cover or shade.
* Failures caused by user negligence, improper use, or incorrect operation are **not covered under warranty**.
* When relocating or transporting the unit after installation, **protect it carefully** to prevent damage during transport.
{% hint style="danger" %}
＊During installation, do not overtighten the sensing pressure screw. 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.
{% endhint %}
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## Installation Guide
* **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:**
| | |
| ------------------------------------------------------------------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------- |
| Near Pumps | Near Valves |
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| 
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| Near Tees, reducers, or expanders | Near Elbows |
| 
| 
|
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#### 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.
| | |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|  |  |
**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
***
### 流量計主機扣具安裝步驟
{% 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 %}
