Flow Meters
SF300 Series — Spring Type Flow Meter
Spring type · Vertical and horizontal mounting
Select a scale for your application, then choose the available connections and options. Original drawings and the complete source PDF are included below.
Find your meter
Original type
Fixed typeTechnical data
Application and operating limits
- Service
- Liquid and oil
- scale
- Water
- Mounting
- Vertical or horizontal; four flow directions
- Accuracy
- ±5% of full scale
- Maximum working pressure
- 1.2 MPa (12 kg/cm²)
- Maximum test pressure
- 2.0 MPa (20 kg/cm²), water at 25°C
- Temperature limits
- PC: −10°C to 60°C; PSU: −10°C to 110°C
- Weight
- 0.3–0.4 kg
Materials and connections
- Body
- Polycarbonate (PC); polysulfone (PSU) available
- O-ring
- Viton
- Float
- Magnet covered with PPS plastic
- Connection / spring
- SS316
- Connection sizes
- ⅜ in, ½ in and ¾ in NPT female
- Alarm switch
- One or two setting points; form A normally open bistable reed switch
- Switch rating
- AC 125 V / 0.5 A; DC 100 V / 10 W; maximum DC 250 V <40 mA
- Alarm setting range
- 10% to 80% of full scale
Dimensions and construction
| Connection | Front width (mm) | Side width (mm) | L (mm) |
|---|---|---|---|
| ⅜ in | 40.6 | 43.5 | 150 |
| ½ in | 40.6 | 43.5 | 150 |
| ¾ in | 40.6 | 43.5 | 150 |
| Connection | Width (mm) | L (mm) |
|---|---|---|
| ⅜ in | 70 | 166 |
| ½ in | 70 | 166 |
| ¾ in | 70 | 166 |
| Code | Water (LPM) | Code | Water (GPM US) |
|---|---|---|---|
| A | 1–4 | H | 0.2–1 |
| B | 2–10 | I | 0.5–2.5 |
| C | 2–20 | J | 0.5–5 |
| D | 3–30 | K | 0.8–8 |
| E | 4–40 | L | 1–10 |
| F | 5–50 | M | 1.3–13 |
| G | 6–60 | N | 1.5–15 |
| Code | Direction |
|---|---|
| BT | Bottom to top |
| TB | Top to bottom |
| RL | Right to left |
| LR | Left to right |
Select your SF300 Series meter
Choose your fluid, units and maximum range to compare the available scales.
Specifications are general selection guidance. Confirm materials, connection standards, operating temperature and pressure with Sightflow before placing an order.