The DF868 is a patented Correlation Transit-Time flowmeter. It provides a complete
ultrasonic flow monitoring solution for fixed installations, with drift-free
measurement in ultraclean and most "dirty" fluids. Fluids with some
gas bubbles can be measured, along with entrained solids that previously required
Doppler-style meters.
The DF868 is suitable for many applications, such as:
- Refined hydrocarbons
- Petroleum products
- Crude oil
- Lubricating oils
- Diesel and fuel oils
- Solvents
- Water and waster water
- Heated and chilled water
- Water / glycol solutions
- Ultrapure water and liquids
- Chemicals
- Beverages
- Other liquids.
This ultrasonic liquid flowmeter uses economical non-intrusive flow measurement
with hazardous area certification. Set up is simple, and suitable on a wide
variety of pipe sizes or materials (including metal, plastic and concrete-lined
pipes). There is a large, LCD backlit display which illustrates velocity, volumetric
and energy flow rates, as well as totalized flow or trend data.
As an option, the DF868 can also come as dual-channel or dual-path models that
can be user-configured. This means that it can be set up to measure flow in
two separate pipes with one meter - making the DF868 practical, versatile and
cost-effective. The DF868 is also highly accurate, particularly as two sets
of transducers can be installed onto the same pipe. This has the effect of reducing
flow profile distortions, flow swirl and cross flow. Special small-pipe clamping
fixtures can be used, with miniature transducers, to facilitate flow measurements
on pipes from 0.5-2 inches. You can also add up to 12 isolated 4-20mA outputs,
up to 6 hermetically sealed or standard alarm relays, and up to 12 frequency
/ totalizer outputs.
| Accuracies |
Often better than 1% |
| Measurement range |
0.1-40ft/s (0.03-12.2 m/s) |
| Measurement method |
Non-contaminating, obstructionless and with no pressure drop |
| Regular maintenance? |
No - because there are no moving parts. |
Pipe Sizes: Clamp-On Transducers |
0.5-300 in (12.7-7.6m) and larger |
| Pipe Sizes: Wetted Transducers |
1-200 in (25.4-5m) and larger |
| Pipe Wall Thickness |
Up to 3 inches (76.2mm) |
| Clamp-On Flow Accuracy |
Pipe ID >6in (150mm): +/-1% to 2% of typical reading.
Pipe ID <6in (150mm): +/- 2% to 5% of typical reading. |
| Range Type: |
Bidirectional |
| Range: |
-40 to 40 ft/sec (-12.2 to 12.2 m/s). |
| Operating Temperature |
-20 to 55 deg c |
| Digital Interfaces |
RS232 (standard). RS485 (optional) ModBus Protocol (optional) |
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