Flow Meters
NP-Type — Rotameter
Flanged flow meter · Metal or plastic wetted parts
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
NP-TypeTechnical data
Application and operating limits
- Service
- Liquid and gases; chemical process, water treatment and industrial flow
- Viscosity
- ≤3 cP
- Accuracy
- ±2.5% of full scale
- Temperature
- Metal: 100°C; plastic: 60°C
- Body pressure
- Metal: 15 kg/cm²; plastic: 6 kg/cm²
- Tube pressure
- Glass: 6 kg/cm²; PC: 10 kg/cm²
The assembly is limited by its lowest-rated component. Confirm the combined pressure, temperature and fluid compatibility.
Materials and options
- Models
- Stainless steel, steel or plastic wetted parts
- Connections
- Flanged: JIS 5K / 10K, ANSI 150# or DIN PN10
- Body materials
- SS304, SS316, SS316L, PVC, PP, PVDF or special option
- Indicating tube
- Glass or polycarbonate
- Alarm
- Normally open; one or two settings
- Switch rating
- AC 125 V / 0.5 A; DC 100 V / 10 W; maximum DC 250 V <40 mA
Dimensions and construction
| Size | Connection | L (mm) | H (mm) |
|---|---|---|---|
| 10A | ⅜ in | 175 | 145 |
| 15A | ½ in | 230 | 200 |
| 20A | ¾ in | 260 | 230 |
| 25A | 1 in | 265 | 230 |
| 32A | 1¼ in | 280 | 245 |
| 40A | 1½ in | 280 | 245 |
| 50A | 2 in | 285 | 245 |
The PDF does not specify A or D dimensions.
Select your NP-Type 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.