Sight Flow Indicators
NAW-Series Flow Sight Glass Gauge
Threaded flow indication with a Teflon ball or rotor
NAW-Series gauges provide direct visual indication of gas or liquid flow using either a highly visible Teflon ball or a rotating impeller.
- CE 2810Marking options available
Service and indication
- Gas and liquid service with threaded female connections
- NAW-1 uses a Teflon ball for horizontal flow in either direction
- NAW-2 uses a rotor and may be installed for flow in any direction
Technical data
Materials and construction
- Body
- SS316, Duplex stainless steel UNS J92205, PP or PVDF
- NAW-1 indicator
- Teflon ball
- NAW-2 indicator
- POM, PP + 10% glass fibre, PPS + 40% glass fibre or PVDF rotor
- Window
- Tempered glass; PSU available on request for NAW-2
- Gasket
- Viton or EPDM
- Rotor guide
- SS316, Duplex stainless steel UNS J92205 or ceramic
Operating limits and connections
- SS316 body with Viton gasket
- -15°C to 200°C
- SS316 body with EPDM gasket
- -20°C to 120°C
- PP body
- 0°C to 60°C
- PVDF body
- -15°C to 90°C with Viton; -20°C to 90°C with EPDM
- Maximum pressure
- Metal 16 bar; PP 8 bar; PVDF 10 bar; PSU window 10 bar at 25°C water
- Connections
- Female NPT, BSP or optional thread
Dimensions
Dimensions in millimetres.
| Dimension | 1/4 in | 3/8 in | 1/2 in | 3/4 in | 1 in | 1 1/4 in | 1 1/2 in |
|---|---|---|---|---|---|---|---|
| A | 76 | 76 | 76 | 89 | 89 | 117 | 117 |
| B | 63 | 63 | 63 | 63 | 63 | 75 | 75 |
| C | 79 | 79 | 79 | 95 | 95 | 125 | 125 |
| Dimension | 1/4 in | 3/8 in | 1/2 in | 3/4 in | 1 in |
|---|---|---|---|---|---|
| A | 76 | 76 | 76 | 89 | 89 |
| B | 63 | 63 | 63 | 63 | 63 |
| C | 65 | 65 | 65 | 83 | 83 |
Flow range tables
Minimum indicated flow values and pressure drop are based on water.
| Size | 1/4 in | 3/8 in | 1/2 in | 3/4 in | 1 in | 1 1/4 in | 1 1/2 in |
|---|---|---|---|---|---|---|---|
| Water (LPH) | 24 | 35 | 290 | 880 | 750 | 900 | 950 |
| Air (NLPM) | 6.9 | 11.3 | 111.8 | 263.9 | 222.2 | 500 | 555.6 |
| ΔP at 2 m/s (bar) | 0.15 | 0.15 | 0.19 | 0.18 | 0.45 | 0.20 | 0.25 |
| Size | 1/4 in | 3/8 in | 1/2 in | 3/4 in | 1 in |
|---|---|---|---|---|---|
| Water (LPH) | 192 | 194 | 203 | 250 | 400 |
| Air (NLPM) | 23.6 | 19.7 | 27.8 | 120.8 | 138.9 |
| ΔP at 2 m/s (bar) | 0.15 | 0.18 | 0.21 | 0.20 | 0.50 |
NAW-2 rotor options
Ordering information
Choose your options to build an enquiry reference.
Specifications are general selection guidance. Confirm materials, connection standards, operating temperature and pressure with Sightflow before placing an order.